Technical Information

Series 42
Closed Circuit Axial Piston Pumps

www.danfoss.com

Technical Information
Series 42 Closed Circuit Axial Piston Pumps

Revision history

2 | © Danfoss | February 2021

Table of revisions
Date

ChangedRev

February 2021

Minor correction - EDC, Coil Options

0109

December 2020 Minor correction

0108

November 2020 Minor update in Hydraulic Fluid Parameters

0107

Septemer 2020

Fixed table on NFPH at Feature and Options.

0106

May 2020

Minor update to HC-EDC schematic

0105

April 2020

Minor update to FNR control and Changed document number from 'BC00000016' and'11022637' to 'BC152886484146'

0104

August 2018

Minor Update0103

December 2016 Minor Update

0102

June 2016

Converted to new Danfoss layout

0101

March 2015

Converted to DITA CMS

DA2007 - 2013

Various Change

AB - CGMay 2007

Updated from existing Page Maker FileAA

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Contents
General Description
Basic Design........................................................................................................................................................................................5
System Diagram................................................................................................................................................................................6
Pump Circuit.......................................................................................................................................................................................6
Technical Specifications
System Specifications..................................................................................................................................................................... 8
System Parameters.......................................................................................................................................................................... 9
Hydraulic Fluid Parameters........................................................................................................................................................ 10
Operating Parameters
System Requirements...................................................................................................................................................................11
System Parameters........................................................................................................................................................................11
Hydraulic Fluid Parameters........................................................................................................................................................ 12
Sizing Equations............................................................................................................................................................................. 13
System Design Parameters
Filtration System ............................................................................................................................................................................14
Filtration Configuration............................................................................................................................................................... 14
Suction Filtration.......................................................................................................................................................................14
Partial-flow Charge Pressure Filtration............................................................................................................................. 15
Full-flow Charge Pressure Filtration...................................................................................................................................15
Mounting Flange Loads...............................................................................................................................................................16
Estimating Overhung Load Moments...............................................................................................................................16
External Shaft Load and Bearing Life...................................................................................................................................... 18
Hydraulic Unit Life......................................................................................................................................................................... 19
Efficiency Graphs............................................................................................................................................................................20
Features and Options
Charge Pump...................................................................................................................................................................................21
Charge Pump Sizing Example:............................................................................................................................................. 22
Charge Relief Valve........................................................................................................................................................................23
Overpressure Protection............................................................................................................................................................. 23
Bypass Valve.....................................................................................................................................................................................24
Displacement Limiters................................................................................................................................................................. 24
Loop Flushing..................................................................................................................................................................................25
Speed Sensor................................................................................................................................................................................... 26
Connecting Pin Designations:..............................................................................................................................................26
Shaft Options...................................................................................................................................................................................28
Auxiliary Mounting Pads............................................................................................................................................................. 29
Control Selection...................................................................................................................................................................... 29
Manual Displacement Control (MDC).....................................................................................................................................31
Features and Benefit of MDC................................................................................................................................................31
Control Input Signal.................................................................................................................................................................31
Response Time...........................................................................................................................................................................32
Control Handles.........................................................................................................................................................................33
Electric Solenoid Override to Neutral................................................................................................................................33
Emergency Override to Neutral with Port for Brake Pressure Release..................................................................34
Neutral Start Switch (NSS)..................................................................................................................................................... 35
NSS with Back-up Alarm (BUA) Switch..............................................................................................................................35
Connectors..................................................................................................................................................................................36
Electrical Displacement Control (HC-EDC)............................................................................................................................37
Features and Benefits of HC-EDC........................................................................................................................................38
Response Time...........................................................................................................................................................................39
Control Input Signal.................................................................................................................................................................40
Control Signal Requirements............................................................................................................................................... 40
Connectors and Port locations............................................................................................................................................ 40
Electrical Displacement Control (EDC)................................................................................................................................... 41
Features and Benefits of EDC............................................................................................................................................... 42
Response Time...........................................................................................................................................................................43
Control Input Signal.................................................................................................................................................................43© Danfoss | February 2021

BC152886484146en-000109 | 3

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Contents
Connectors and Port locations............................................................................................................................................ 43
Coil options.................................................................................................................................................................................43
Non-Feedback, Proportional Hydraulic (NFPH) Control.................................................................................................. 44
Features and Benefits of the NFPH control..................................................................................................................... 45
Connectors and Port locations............................................................................................................................................ 45
Non-Feedback, Proportional Electric (NFPE) Control........................................................................................................46
Features and Benefits of the NFPE control......................................................................................................................47
Input Signal Requirements....................................................................................................................................................47
Connectors and Port locations............................................................................................................................................ 47
Forward, Neutral, Reverse (FNR) Control...............................................................................................................................48
Features and Benefits of FNR control................................................................................................................................ 49
Input Signal Requirements....................................................................................................................................................49
Connectors and Port locations............................................................................................................................................ 49
Installation Drawings
Frame Size 28/32............................................................................................................................................................................ 50
Frame Size 41/51............................................................................................................................................................................ 52
Shaft Options...................................................................................................................................................................................54
Filtration Options........................................................................................................................................................................... 55
Suction filtration adapter - option G..................................................................................................................................55
Charge pressure filtration adapter - full filter flow - option B...................................................................................56
No charge pump - option X.................................................................................................................................................. 57
Charge pressure filtration - full filter flow (no adapter) - option F..........................................................................57
Control Modules.............................................................................................................................................................................59
Manual displacement control (MDC) options................................................................................................................ 59
Electric control (FNR) options - FRAME SIZE 28/32.......................................................................................................61
Three-position electric control (FNR) options - FRAME SIZE 41/51........................................................................ 62
Non-feedback proportional hydraulic (NFPH) control options............................................................................... 64
Non-feedback proportional electric (NFPE) control options - FRAME SIZE 28/32............................................ 65
Non-feedback proportional electric (NFPE) control options - FRAME SIZE 41/51............................................ 65
Electrical displacement control (HC-EDC) options....................................................................................................... 66
Electrical displacement control (EDC) options...............................................................................................................67
Speed Sensor Option....................................................................................................................................................................68
Auxiliary Mounting Pads............................................................................................................................................................. 69
Schematics
Pump Schematics...........................................................................................................................................................................70
Model CodeModel Code: A, B, Y, C...................................................................................................................................................................71
Model Code: D.................................................................................................................................................................................72
Model Code: E..................................................................................................................................................................................73
Model Code: F, Q, R........................................................................................................................................................................74
Model Code: G, S, T, U...................................................................................................................................................................76
Model Code: H, J.............................................................................................................................................................................77
Model Code: K, L, M, N, P............................................................................................................................................................. 78

4 | © Danfoss | February 2021

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Technical Information
Series 42 Closed Circuit Axial Piston Pumps
General Description

Basic Design
Series 42 pumps are advanced hydrostatic units for medium power applications with maximum loads of415 bar [6017 psi] (28/41 cm3) and 350 bar [5075 psi] (32/51 cm3). You can combine these pumps with asuitable Danfoss motor or other products in a system to transfer and control hydraulic power.
The Series 42 variable displacement pump is a compact, high power density unit, using the parallel axial
piston/slipper concept in conjunction with a tiltable swashplate to vary the pump’s displacement.
Reversing the angle of the swashplate reverses the flow of fluid from the pump, and reversing thedirection of rotation of the motor output. Series 42 pumps provide an infinitely variable speed range
between zero and maximum in both forward and reverse.
Series 42 pumps use a cradle swashplate design with a hydraulic servo control cylinder. Control isprovided through a compact servo control system. A variety of servo controls are available. These include
mechanically- or electrically-actuated feedback controls, hydraulic or electric proportional controls, and athree-positio
28/32/41/51 cm3 Cross-Sectional View

Swashplate

PistonRoller bearing
Charge pump
Valve plate
P100382E© Danfoss | February 2021

BC152886484146en-000109 | 5

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
General Description
System Diagram
Pictorial Circuit Diagram
Servo control cylinder
Displacement control valve
Heat exchanger
bypassContro lhandl eFilterFixed
displacemen t
moto r
Cylinderblockassembl y

Heatexchanger

Cylinderblockassembl y

Input
shaft

Reservoir

Charge relief
valve

Outputshaft

Chargepum p
Variable
displacemen t
pum pCheck valves
with high pressur erelief valves

Suction flow
Charge pressur eServo pressur eHigh pressur eCase flow

This illustration shows a Series 42 variable pump in a hydraulic circuit with a Series 40 - M35 fixed motor.
The circuit is set up in a suction filtration configuration with a displacement control valve included on thepump. Note the position of the reservoir and heat exchanger.
Pump Circuit
Schematic Diagram
M3
L2

A
M1

M2
B

M5

M4

S

L1
P100385E

The illustration above shows a schematic of a Series 42 pump. System ports A and B connect to the highpressure work lines. Return fluid is received from its inlet port, pressurized, and discharged through theoutlet port. Flow direction is determined by swashplate position. You can read system port pressure
through ports M1 and M2. The pump has two case drains (L1 and L2) to ensure there is lubricating fluid in
6 | © Danfoss | February 2021

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
General Description
the system. This schematic includes a manual displacement control and loop flushing valve. For othercontrol schematics see the related control section.

© Danfoss | February 2021

BC152886484146en-000109 | 7

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Technical Specifications

System Specifications
General Specifications
FeatureSeries 42

Pump typeIn-line, axial piston, positive displacement pumps including cradle
swashplate and servo control

Direction of input rotation

Clockwise or counterclockwise

Recommended installation position

Pump installation recommended with control position on the top or
side. Consult Danfoss for non conformance guidelines. The housing
must always be filled with hydraulic fluid.

Filtration configuration

Suction or charge pressure filtration

Other system requirements

Independent braking system, suitable reservoir and heat exchanger.

Hardware Features
Single variable pump

Pump configuration
Frame size

cm3

28

32

41

51

Displacement

cm3
[in3]

28
[1.71]

31.8[1.94]

40.9[2.50]

51[3.11]

Weight

kgf
[lbf]

34.5
[76]

34.5
[76]

42
[92]

42
[92]

Mass moment of inertiakg•m2 0.0018[lbf•ft2] [0.0013]

0.0019[0.0013]0.0036[0.0027]

0.0038[0.0028]140-415[2030-6017]

140-345[2030-5003]

Type of front mounting flange(SAE flange size per SAE J744)

SAE B
SAE-twin ports, radial

Port connections
System pressure regulation

8 | © Danfoss | February 2021

bar
[psi]

140-415[2030-6017]

140-345[2030-5003]

Displacement limiters

OptionInput shaft options

Splined, Round Straight Key

Auxiliary mounting pad(SAE pad per SAE J744)

SAE A (9 tooth and 11 tooth)
SAE B (13 tooth and 15 tooth)Control options

MDC, FNR, NFPH, NFPE, HC-EDC, EDC

Filtration configuration

Suction or charge pressure filtration

Loop flushing

OptionBC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Technical Specifications
System Parameters
Case pressure
Rated pressure

bar
[psi]

3 [44]

Maximum pressure (cold start)

bar
[psi]

5 [73]

Frame size

cm3

28

32

41

51

Maximum working pressure *

bar
[psi]

400 [5800]

350 [5075]

400 [5800]

350 [5075]

Maximum pressure

bar
[psi]

450 [6525]

400 [5800]

450 [6525]

400 [5800]

Pressure Limits* Operation above maximum working pressure is permissible with Danfoss application approval.

Inlet Pressure
Continue pressurebar (absolute)[in Hg vacuum]

0.8 [6]

Minimum pressure (cold start)bar (absolute)[in Hg vacuum]

0.2 [24]

cm3

28

32

41

51

500

500

500

500

Speed Limits
Frame size

min-1

Minimum speed(rpm)

Rated speed at maximum
displacement

min-1
(rpm)

3400

3000

3200

2900

Maximum speed at maximum
displacement

min-1
(rpm)

3750

3400

3450

3400

Charge Pump Displacement and Setting Pressure
cm3

28/32

41/51

cm3/rev

11 [.67]

15.6 [.92]—[in3/rev]

Optional

Optional

Standard
Optional

bar
[psi]

14 [203]
10-24 [145-348]

20 [290]
10-24 [145-348]

Frame size
Chargepump

Internal
External

Charge relief valve
settings

Standard

Theoretical Flow
Frame size

cm3

Theoretical flow at rated speed

l/min
95.2 [25.1][US gal/min]

28

32

41

51

95.4[25.2]

131 [34.6]

148 [39.1]

Check/high Pressure Relief Valve© Danfoss | February 2021

Options

No relief valve /check only

Relief valve / check

Setting—140-415 [2030-6017]

BC152886484146en-000109 | 9Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Technical Specifications
Hydraulic Fluid Parameters
Fluid temperature range
Minimum-40 °C [-40 °F]

Intermittent, cold start

Maximum continuous

104 °C [220 °F]

Maximum

Maximum

115 °C [240 °F]

Intermittent

Fluid cleanliness level
Required fluid cleanliness level

ISO 4406 Class 22/18/13

Recommended βx-ratio for suction filtration

β35-45 = 75 (β10 ≥ 2)

Recommended βx-ratio for charge pressure filtration

β15-20 = 75 (β10 ≥ 10)

Recommended inlet screen size for charge pressure filtration

100 μm-125 μm

Fluid viscosity

10 | © Danfoss | February 2021

Minimum

7.0 mm2/s (cSt)Intermittent

Recommended operating range

12-60 mm2/s (cSt)-

Maximum

1600 mm2/s (cSt)Intermittent, cold start

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Operating Parameters

System Requirements
Independent braking system

W Warning
Unintended vehicle or machine movement hazard. The loss of hydrostatic drive line power, in any
mode of operation (forward, neutral, or reverse) may cause the system to lose hydrostatic braking
capacity. You must provide a braking system, redundant to the hydrostatic transmission, sufficient tostop and hold the vehicle or machine in the event of hydrostatic drive power loss.
Reservoir
Design the system to accommodate maximum volume changes during all system operating modes andto promote de-aeration of the fluid as it passes through the tank. Minimum reservoir volume is 5/8 of the
maximum charge pump flow per minute with a minimum fluid volume equal to 1/2 of the maximum
charge pump flow per minute. At the maximum return flow, this allows 30 seconds fluid dwell for
removing entrained air. This is adequate for a closed reservoir (no breather) in most applications. Position
the reservoir outlet (pump inlet) above the bottom of the reservoir to take advantage of gravity
separation and prevent large foreign particles from entering the charge inlet line. Use a 100 - 125 μm
screen over the outlet port. Position the reservoir inlet (fluid return) so that flow to the reservoir isdischarged below the normal fluid level, and directed into the interior of the reservoir for maximum dwelland efficient de-aeration. Use a baffle (or baffles) between the inlet and outlet ports to promote deaeration and reduce surging of the fluid.
System Parameters

Speed limits
Rated speed is the speed limit we recommend at full power condition and is the highest value at which
you can expect normal life. Maximum speed is the highest operating speed we permit. You cannot
operate above this speed without risk of immediate failure and loss of drive line power and hydrostatic
braking capacity (which may create a hazard). In mobile applications, you must apply this pump with aspeed speed below the stated maximum. Consult Pressure and Speed Limits, BC152886484313, when
determining speed limits for a particular application.
Inlet pressure
Control charge pump inlet conditions to achieve expected life and performance. Ensure a continuous
inlet pressure of not less than 0.8 bar absolute (not more than 6 in Hg vacuum). Normal pressures lessthan 0.7 bar absolute (greater than 9 in Hg vacuum) indicate inadequate inlet design or a restricted filter.
Pressures less than 0.7 bar absolute (greater than 9 in Hg vac) during cold start are possible, but should
improve quickly as the fluid warms. Never exceed the maximum inlet vacuum.
Theoretical output
The theoretical maximum flow at rated speed is a simple function of pump displacement and speed. Thisis a good gauge for sizing a companion motor. This does not take into account losses due to leakage orvariations in displacement.
Case pressure
Under normal operating conditions, the rated case pressure must not be exceeded. During cold startcase pressure must be kept below maximum intermittent case pressure. Size drain plumbing accordingly.

© Danfoss | February 2021

BC152886484146en-000109 | 11

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Operating Parameters
System pressure
System pressure is the differential pressure between high pressure system ports. It is the dominantoperating variable affecting hydraulic unit life. High system pressure, which results from high load,
reduces expected life. Hydraulic unit life depends on the speed and normal operating, or weighted
average, pressure that can only be determined from a duty cycle analysis.
Application pressure - is the high pressure relief or pressure limiter setting normally defined within theorder code of the pump. This is the applied system pressure at which the driveline generates the
maximum calculated pull or torque in the application. Maximum Working Pressure - is the highest
recommended Application pressure.
Maximum working pressure is not intended to be a continuous pressure. Propel systems with
Application pressures at, or below, this pressure should yield satisfactory unit life given propercomponent sizing.
Maximum pressure is the highest allowable Application pressure under any circumstance. Applicationpressures above Maximum Working Pressure will only be considered with duty cycle analysis and factory
approval.
Minimum pressure must be maintained under all operating conditions to avoid cavitation.

W Warning
All pressure limits are differential pressures referenced to low loop (charge) pressure. Subtract low looppressure from gauge readings to compute the differential.

Hydraulic Fluid Parameters

Hydraulic fluid
Ratings and data are based on operating with hydraulic fluids containing inhibitors to prevent oxidation,
rust, and foam. These fluids must possess good thermal and hydrolytic stability to prevent wear, erosion,and corrosion of the internal components.

C Caution
Never mix hydraulic fluids of different types.
Temperature and viscosity
Ensure the application satisfies temperature and viscosity requirements concurrently. The data shown in
the tables on Hydraulic Fluid Parameters on page 10, assume petroleum-based fluids.
High temperature limits apply at the hottest point in the transmission, which is normally the case drain.
Always run the pump at or below the continuous temperature. Never exceed maximum temperature.
Durability of transmission components is not affected by cold oil, but it may affect the ability of oil to flow
and transmit power. Keep temperatures 16 °C [30 °F] above the pour point of the hydraulic fluid. The
minimum temperature relates to physical properties of component materials.
For maximum unit efficiency and bearing life, keep fluid viscosity in the continuous viscosity range.
During brief occasions of maximum ambient temperature and severe duty cycle operation, minimum
viscosity may occur. The system should encounter maximum viscosity only at cold start.
Size heat exchangers to keep the fluid temperature and viscosity within these limits. Test the system toverify that these temperature limits are not exceeded.

12 | © Danfoss | February 2021

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Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Operating Parameters
Sizing Equations
Use these equations to help choose the right pump size and displacement for your application.

Based on SI units

Based on US units

Flow

=

Vg • n • η v
1000(l/min)=TorqueInput torque M =Vg • ′p
20 • π • η m(N•m)

Input torque M =

Power

•n•π
Input power P = M= 600 • η
30 000(kW)M•n•π
Input power P = 198= 1714 • η000

Q • ′pt

Vg • n • η v
231(US gal/min)Vg • ′p2 • π • ηm(lbf•in)Q • ′p(hp)
t

Variables
SI units [US units]© Danfoss | February 2021

Vg

= Displacement per revolution cm3/rev [in3/rev]PO= Outlet pressure bar [psi]Pi= Inlet pressure bar [psi]∆p= pO - pi (system pressure) bar [psi]n= Speed min-1 (rpm)ηv= Volumetric efficiency

ηm= Mechanical efficiency

ηt= Overall efficiency (ηv • ηm)

BC152886484146en-000109 | 13

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
System Design Parameters
Filtration System
To prevent premature wear, use only new clean fluid. Use a filter capable of controlling fluid cleanlinessto ISO 4406 Class 22/18/13 (SAE J1165).
Locate the filter on the inlet (suction filtration) or discharge (charge pressure filtration) side of the charge
pump: Series 42 pumps are available with provisions for either configuration.
The selection of a filter depends on a number of factors including the contaminant ingression rate, thegeneration of contaminants in the system, the required fluid cleanliness, and the desired maintenanceinterval. Use filters that meet the above requirements of efficiency and capacity.
Filter efficiency can be measured with a Beta ratio1 (βX). For simple suction-filtered closed circuit
transmissions and open circuit transmissions with return line filtration, a filter with a β-ratio within therange of β35-45 = 75 (β10 ≥ 2) or better has been found to be satisfactory. For some open circuit systems,
and closed circuits with cylinders being supplied from the same reservoir, a higher filter efficiency isrecommended. This also applies to systems with gears or clutches using a common reservoir. For thesesystems, a charge pressure or return filtration system with a filter β-ratio in the range of β15-20 = 75 (β10≥10) or better is typically required.
Because each system is unique, only a thorough testing and evaluation program can fully validate thefiltration system. Please see Design Guidelines for Hydraulic Fluid Cleanliness, BC152886482150,
Technical Information for more information.
Filtration Configuration
Suction Filtration
The suction filter is in the circuit between the reservoir and the inlet to the charge pump as shown. Allflow to the charge pump is filtered.
Suction filtration
FilterReservoir

Strainer

To low pressure
side of loop andservo control

Chargepump
Chargereliefvalve

To pump case

P001603E

C Caution
Clogged filters can reduce the flow of charge fluid to the pump. Replace filters regularly before they
become blocked.

14 | © Danfoss | February 2021

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Technical Information
Series 42 Closed Circuit Axial Piston Pumps
System Design Parameters
Partial-flow Charge Pressure Filtration
Charge pressure filtration is available on all Series 42 pumps. The pressure filter is remotely mounted andfits in the circuit after the charge pump, as shown. Charge pressure filtration can reduce inlet vacuum incold start-ups and provides fluid filtration immediately upstream of the system loop and the control
system.
In charge pressure filtration circuits, use non-bypass filters rated to at least 35 bar [508 psi] working
pressure. Use a 100‑125 μm screen located in the reservoir or in the charge inlet line when using chargepressure filtration.
Charge pressure filtration, Partial-flow
Reservoir
Strainer
FilterCharge pump

To low pressure
side of loop andservo control
Chargerelief valve
To pump case

P001604E

Incorporating the charge pressure relief valve ahead of the filter element achieves partial filter flow. Filter
flow is just enough to satisfy the needs of the system loop and control. Insufficient flow through the filter
results in inadequate charge pressure and affects machine performance. Select a filter capable ofwithstanding a pressure drop equal to charge pressure while maintaining the filter βX-ratio at or above avalue of one (no additional contaminants introduced into system).
Full-flow Charge Pressure Filtration
Incorporating the charge pressure relief valve behind the filter element acheives full filter flow. Total
charge flow passes through the filter increasing the rate of contaminant removal from the system.
A filter bypass valve is necessary to prevent filter damage and to avoid contaminants from forcing
through the filter media due to high pressure differentials across a clogged filter. In the event of highpressure drop associated with a blocked filter or cold start-up conditions, fluid can bypass the filter. Avoid
working with an open bypass for extended periods. Use a visual or electrical dirt indicator. Prope
Charge pressure filtration, Full-flow
Reservoir
Strainer
Filte rwith bypass

To low pressure
side of loop andse rvo control

Chargepump
Chargereliefpump

To pump case

© Danfoss | February 2021

P001605E

BC152886484146en-000109 | 15

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
System Design Parameters
Mounting Flange Loads
Adding tandem mounted auxiliary pumps and/or subjecting pumps to high shock loads may result inexcessive loading of the mounting flange. Design pump applications to stay within the allowable shockload and continuous load moments.
Shock load moment MS is the result of an instantaneous jolt to the system. Rated (continuous) load
moments MR are generated by the typical vibratory movement of the application.
Estimated maximum and continuous acceleration factors for some typical applications are shown in thetable.
Applications which experience extreme resonant vibrations may require additional pump support.
Exceeding the allowable overhung values listed below will require additional pump support.
G-factors for sample applications
Continuous (vibratory)
acceleration (GR)Maximum (shock)acceleration (GS)Skid steer loader

410Trencher (rubber tires)

3

8Asphalt paver

2

6

Application

Windrower

2

5

Aerial lift

1.5

4

Turf care vehicle

1.5

4

Vibratory roller

610

Allowable overhung load moments
Frame size (cm3)

Rated load moment (MR)Shock load moment (MS)28/32

1441 N•m [12750 in•lbf]

3413 N•m [30200 in•lbf]

41/51

1441 N•m [12750 in•lbf]

3413 N•m [30200 in•lbf]

Estimating Overhung Load Moments
Overhung load moments

Pump 1 centerof gravity

MountingflangePump 2 centerof gravity

L1
L2
P100400E

MS = GS (W1L1 + W2L2 + ... +WnLn)
16 | © Danfoss | February 2021

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Technical Information
Series 42 Closed Circuit Axial Piston Pumps
System Design Parameters
MR = GR (W1L1 + W2L2 + ... +WnLn)
Where:© Danfoss | February 2021

MR

= Rated load moment N•m [lbf•in]MS= Shock load moment N•m [lbf•in]GR= Rated (vibratory) acceleration (G-factors:unitless)GS= Maximum (shock) acceleration (G-factors:unitless)WS= Weight of the pump N [lbf]L= Distance from mounting flange to the center of gravity mm [in]BC152886484146en-000109 | 17

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
System Design Parameters
External Shaft Load and Bearing Life
Bearing life is a function of speed, pressure, and swashplate angle, plus any external loads. Other factorsthat affect life include fluid type, viscosity, and cleanliness.
In vehicle propulsion drives with no external loads—where the speed, pressure, and swashplate angle areoften changing—normal bearing B10 (90% survival) life exceeds the hydraulic unit life.
In non-propel drives, such as conveyors or fan drives, the operating speed and pressure may be nearly
constant leading to a distinctive duty cycle compared to that of a propulsion drive. In these types ofapplications, we recommend a bearing life review. Series 42 pumps use bearings that can accept someincidental external radial and thrust loads. However, any amount of external load reduces the expected
bearing life.
The allowable radial shaft loads are a function of the load position, orientation, and operating pressuresof the hydraulic unit. In applications where you cannot avoid external shaft loads, minimize the impact onbearing life by orienting the load to the 90° or 270° position.
The maximum allowable radial load is calculated as: Re=Me/L
Where:L= Distance from mounting flange to point of load

Me

= Maximum external moment

Re= Maximum radial side load

Tout

= Thrust load

Avoid thrust loads in Tin direction.
Allowable Shaft Loads
Frame size

cm3

28

32

41

51

M2

N•m [lbf•in]

98 [867]

86 [763]

111 [982]

90 [800]

Tout

N [lbf]

1100 [250]1100 [250]1100 [250]1100 [250]

If continuously applied external radial loads are 25% of the maximum allowable or more, or thrust loads
are known to occur, contact your Danfoss representative for an evaluation of unit bearing life. Use
tapered output shafts or clamp-type couplings where radial shaft side loads are present.
Use the table and drawing to determine maximum allowable radial loads (Re), based on the maximum
external moment (Me) and the distance (L) from the mounting flange to the load.
External Shaft Load Orientation

L
0° Re
Re
Tout

90° Re270° Re
Axis of
Swashplate
RotationTin
180° Re
18 | © Danfoss | February 2021

P100399E

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
System Design Parameters
Hydraulic Unit Life
Hydraulic unit life is the life expectancy of the hydraulic components. Hydraulic unit life is a function of
speed and system pressure. Hwever, system pressure is the dominant operating variable. High pressure,which results from high load, reduces expected life.
Design the hydraulic system to a projected machine duty cycle. Know the expected percentages of time
at various loads and speeds. Ask your Danfoss representative to calculate an appropriate pressure based
your hydraulic system design. If duty cycle data is not available, input power and pump displacement areused to calculate system pressure.
All pressure limits are differential pressures (referenced to charge pressure) and assume normal chargepressure.
Series 42 pumps will meet satisfactory life expectancy if applied within the parameters specified in thisbulletin. For more detailed information on hydraulic unit life see Pressure and Speed Limits,
BC152886484313.

© Danfoss | February 2021

BC152886484146en-000109 | 19

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
System Design Parameters
Efficiency Graphs
The following performance map provides typical volumetric and overall efficiencies for Series 42 pumps.
These efficiencies apply for all Series 42 pumps at maximum displacement.
Pump performance as a function of operating speed at maximum displacement*
100

Efficiency — %- 170 bar [2500 psi]
Volumetric Efficiency

95

90

85

80

e
Ov

0

ric Efficiency - 345 bar [5000 psi]umet
Vol Overall Efficie
nc y - 1
7 0 b ar
[2500
psi]
345
y
c
b
ar
n
[5000 psi]
cie
i
f
f
E
rall

25
50
75
Speed, % of Rated Speed

100
P100401E

The following performance map provides typical pump overall efficiencies at various operating
parameters. These efficiencies also apply for all Series 42 pumps at maximum displacement.
Pump performance at select operating parameters at maximum displacement*

System Pressure

psi
5000
4000

bar
350
300
250

3000
2000

200
150

%
88

100
1000
0

87%

85%

80%

50
0

0

25
50
75
Speed, % of Rated Speed

100

P100402E* Assumes viscosity in the continuous range

20 | © Danfoss | February 2021

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Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Charge Pump
All Series 42 pumps applied in closed circuit installations require charge flow to make up for internal
leakage, to maintain positive pressure in the main circuit, to provide flow for cooling, to replace any
leakage losses from external valving or auxiliary systems, and to provide flow and pressure for the pumpcontrol system.
Many factors influence the charge flow requirements and the resulting charge pump size selection. These
factors include system pressure, pump speed, pump swashplate angle, type of fluid, temperature, size ofheat exchanger, length and size of hydraulic lines, control response characteristics, auxiliary flow
requirements, hydraulic motor type, etc.
Gerotor Style Charge Pump

Low
PressureHigh
Pressure
P100389E

The total charge flow requirement is the sum of the charge flow requirements of each of the components
in the system. When initially sizing and selecting hydrostatic units for an application, it is frequently notpossible to have all of the information necessary to accurately evaluate all aspects of charge pump size
selection. The following procedure will assist the designer in arriving at an initial charge pump selection
for a typical application.
In most Series 42 applications a general guideline is that the charge pump displacement should be equal
to or greater than 10% of the total displacement of all axial piston or bentaxis units in the system.
Series 42 pumps may be equipped with integral charge pumps. The available charge pump sizes shouldmeet the needs of a majority of Series 42 applications.
Series 42 pumps are also available without charge pumps. When equipped without a charge pump, an
external charge supply is required to ensure adequate charge pressure and cooling.
Charge Pump Output Flow
US gal/min
l/min
16
60
12

45

8

30

4

15

0

0

.6

15

92

[0.

³
cm

0

1000

.67

³ [0

cm
11

2000
3000
Speed min-1(rpm)

]

in³

in³]

4000
P100390E© Danfoss | February 2021

BC152886484146en-000109 | 21

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Charge Pump Power Requirements
hp
4

kW
3

3

.6

2

15

³
cm

92

[0.

2

]

in³

0.67

m³ [

11 c

1

in³]

1
0

0
0

1000

2000

3000

Speed min-1(rpm)4000
P100391E

Particular application conditions may require a more detailed review of charge pump sizing. System
features and conditions that may invalidate the 10% of displacement rule include (but are not limited to):• Operation at low input speeds (below 1500 rpm)

•
•
•
•

Shock loading
Excessively long system lines
Auxiliary flow requirements
Use of low speed, high torque motors

If a charge pump of sufficient capacity to meet the 10% of displacement rule is not available or if any of
the above conditions exist, which could invalidate the 10% rule, contact your Danfoss representative forapplication assistance.
You can find a charge pump sizing worksheet in Selection of Driveline Components, BC157786484430.
Charge Pump Sizing Example:
A system consists of a single Series 42 - 28 Variable Pump driving two Series 40 -M35 Fixed Motors:• TD = 28 + 35 + 35 = 98 cm3•

CPD = 10 % x TD = 9.8 cm3This requires a charge pump displacement of 9.8 cm3 [0.59 in3] or more. Sufficient charge flow for thisapplication is provided by a 11 cm3 [0.67 in3] charge pump.

22 | © Danfoss | February 2021

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Charge Relief ValveThe charge relief valve maintains charge pressure at a designated level. Series 42 pumps come withdirect-acting poppet style charge relief valves. The valve setting is set at the factory. The setting is screw
adjustable.
The charge pressure settings are nominal values and are based on the charge flow across the charge
relief valve with a fluid viscosity of 28 mm2/s (cSt) [130 SUS] and a pump input speed of 1800 min-1(rpm).
Actual charge pressure differs slightly from the nominal setting when different input speeds are used.
The charge setting is a differential pressure (referenced to case pressure) and measured with the piston
pump at zero swashplate angle (neutral). Charge pressure drops slightly when the pump is in stroke due
to flow demands.
The charge pressure setting for pumps without an internal charge pump is set with an assumed charge
flow of 19 l/min (5 US gal/min). These units must have adequate charge flow supplied to the charge inlet
in order to maintain charge pressure at all times.
Charge Relief ValveTo CaseTo Low Sideof Working
Loop & Servo
Control

From Charge
Pump
P100392E

C Caution
Incorrect charge pressure settings may result in the inability to build required system pressure, inability
to control pump, and/or inadequate loop flushing flows. Maintain correct charge pressure under all
operating conditions.

Overpressure Protection
Series 42 pumps are available with a combination charge check and high pressure relief valve assembly.
High pressure relief valves come in a range of settings as shown in the model code. You may specify
individual port pressure settings. The high pressure relief valve settings are a differential pressure(referenced to charge pressure) and are set at 3.8 l/min (1 US gal/min) of flow.
We can equip pumps with charge check valves only, if high pressure relief valve protection is notnecessary.
Charge Check and High Pressure Relief Valve
Charge pressure
High pressure
side of working loop

Charge check andhigh pressure
relief valve

P100393E© Danfoss | February 2021

BC152886484146en-000109 | 23

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options

C Caution
High pressure relief valves are for transient overpressure protection, not for continuous pressure control.
Operation over relief valves for extended periods of time results in severe heat build up. High flows overrelief valves may result in pressure levels exceeding the nominal valve setting and potential damage tosystem components.

Bypass Valve
Series 42 pumps are available with an optional bypass function for use when pump shaft rotation is notpossible. Use the bypass function to bypass fluid around the variable displacement pump. For example:
you may move a disabled vehicle to a service location or winch it onto a trailer without operating theprime mover.
The bypass valve is integral to the charge check/high pressure relief valve assembly. Depress theplungers located in the plugs of the valve assemblies to operate the bypass function. The valves remain
open until the prime mover is started. Charge pressure automatically closes them.
Charge Check and High Pressure Relief Valve with Bypass
Charge pressure
FLOW

BypassplungerHigh pressure
side of working
loop

Charge check andhigh pressure
relief valve
P100394E

C Caution
Damage to the hydraulic system may result from operating without charge flow. Bypass valves are formoving a machine or vehicle for very short distances at very slow speeds. They are NOT tow valves.

Displacement Limiters
Series 42 pumps are available with adjustable mechanical displacement (stroke) limiters located in the
servo covers. The maximum displacement of the pump can be limited to any value from its maximum
displacement to zero in either direction. The limiters are factory set slightly beyond the maximum
displacement of the pump. Displacement limiters may not be suited to all applications.
Series 42 pump displacement limiters

24 | © Danfoss | February 2021

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Loop Flushing
Series 42 pumps have an integral loop flushing valve for circuits requiring the removal of excessive
contamination or with high cooling requirements. We also provide an orificed loop flushing relief valve.
The orifice controls loop flushing flow in most conditions. A combination of relief setting and orifice size
controls flushing flow. For proper operation, ensure the loop flushing relief valve is set at or below the
charge relief setting. Contact your Danfoss representative for application assistance.
Loop flushing valve

Lo

C Caution
Incorrect pressure settings may result in the inability to build required system pressure, insufficient
control pressure, and/or inadequate loop flushing flow. Maintain correct charge pressure under all
operating conditions.
Loop flushing flow
[psi]
0

100

200

300

400

10
2.5

9
Optio

7

n4

2
3
ion
Opt

6

5
ion
O pt

5

Optio

n2

1.5

4

1

[US gal/min]

Loop Flushing Flow (l/min)

8

3
2

0.5

1
0

0
0

© Danfoss | February 2021

5

10

15
Charge Pressure (bar)

20

25

30
P100398E

BC152886484146en-000109 | 25

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Speed Sensor
Series 42 pumps are available with a speed sensor option for direct measurement of pump input speed.
A special magnetic speed ring is pressed onto the outside diameter of the cylinder block and a Hall effectpulse pickup sensor is located in the pump housing. The sensor accepts supply voltage and outputs adigital pulse signal in response to the speed of the ring. The output changes its high/low state as thenorth and south poles of the permanently magnetized speed ring pass by the face of the sensor. The
digital signal is generated at frequencies suitable for microprocessor based controls.
This sensor operates with a supply voltage of 4.5 to 15 Vdc, and requires a current of 12 mA at 5.0 Vdc
under no load. Maximum operating current is 20 mA at 5 Vdc. Maximum operating frequency is 15 kHz.
Output voltage in high state (VOH) is sensor supply voltage minus 0.5 Vdc, minimum. Output voltage inlow state (VOL) is 0.5 Vdc, maximum.
Contact your Danfoss representative for production availability on specific pump frame sizes, or for
special speed sensor options.
Connecting Pin Designations:

•
•
•
•

Pin A: Supply voltage
Pin B: Speed signal, digital
Pin C: Ground common
Pin D: Direction of rotation

Speed ring data
Frame size
Pulses/rev

cm3

28/32

41

51

41

47

47

Technical Data Speed Sensor
Supply voltage1

4.5 - 8.5 Vdc

Supply voltage regulated

15 Vdc maximum

Required current

12 mA at 5 Vdc (no load)

Maximum current

20 mA at 5 Vdc and 1 Hz

Maximum frequency

15 kHzVoltage “high”

Supply voltage -0.5 Vdc minimum

Voltage “low”

0.5 Vdc maximum

Temperature range-40 to 110 °C [-40 to 230 °F]

1 It is not acceptable to energize the 4.5 - 8.5 Vdc speed sensor with 12 Vdc battery voltage; it must be energized by aregulated power supply. If it is desirable to energize the sensor with battery voltage, contact your Danfoss
representative for and optional speed sensor.

26 | © Danfoss | February 2021

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Speed sensor with Packard Weather-Pack Connector (KPPG13408)
Packard Weather-Pack
4 pin(Supplied Connector)
Red
White
Black
Green

A
B
C
D

(200)
P002108E© Danfoss | February 2021

Mating Connector
No.: K03379
Id.-No.: 505341

BC152886484146en-000109 | 27

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Shaft Options
Series 42 pumps are available with a variety of splined and tapered shaft ends. The accompanying tableshows available shaft sizes and torque ratings. Maximum torque ratings are based on shaft torsional
strength and assume a maximum of 200 000 load reversals.
Use ANSI B92.1 Class 5 mating splines for splined output shafts. Danfoss external splines are modified
Class 5 fillet root side fit. The external spline major diameter and circular tooth thickness dimensions are
reduced in order to insure a clearance fit with the mating spline.
Shaft Availability and Torque Rating*
Shaft

Max. torque, 28/32 cm3Max. torque, 41/51 cm3

13 tooth spline, 16/32 pitch

226 N•m [2000 in•lbf ]226 N•m [2000 in•lbf ]15 tooth spline, 16/32 pitch

362 N•m [3200 in•lbf ]362 N•m [3200 in•lbf ]19 tooth spline, 16/32 pitch—

734 N•m [6500 in•lbf ]Round Straight Key Ø25.4mm [1 in]

362 N•m [3200 in•lbf ]362 N•m [3200 in•lbf ] *** The limitations of these input shafts constrain the allowable auxiliary coupling torque.
** Not recommended for all options. Contact your Danfoss representative.

28 | © Danfoss | February 2021

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Auxiliary Mounting Pads
Auxiliary mounting pads are available on all Series 42 pumps to mount auxiliary hydraulic pumps. We
include a sealed (oil tight) shipping cover as standard equipment. The shipping cover seals case pressure
and you can use it as a running cover if desired.
Since the auxiliary mounting pad operates under case pressure, you must use an O-ring to seal theauxiliary pump to the pad. The drive coupling is lubricated with oil from the main pump case.
Spline specifications and torque ratings are shown in the accompanying table.
All mounting pads meet SAE J744 specifications.

•
•
•

•

The sum of main and auxiliary pump torque must not exceed stated maximum.
All torque values assume a 58 Rc shaft spline hardness on mating pump shaft. Maximum torque isbased on maximum torsional strength and 200 000 load reversals.
Applications with severe vibratory or high G-force (shock) loading may require additional structural
support to prevent leaks or mounting flange damage. Refer to Mounting flange loads for additional
information.

Auxiliary Pad*
Pad size

SplineMinimum spline length(mm [in])Maximum torque (N•m[lbf•in])

SAE A

9 tooth 16/32 pitch

13.5 [0.53]

107 [950]

SAE A special

11 tooth 16/32 pitch

13.5 [0.53]

147 [1300]

SAE B

13 tooth 16/32 pitch

14.2 [0.56]

248 [2200]

SAE B-B

15 tooth 16/32 pitch

14.2 [0.56]

347 [3070]* Allowable Auxiliary coupling torque is subject to limitations of the input shaft.
This drawing provides the dimensions for the auxiliary pump mounting flange and shaft. Auxiliary pump
mounting flanges and shafts with these dimensions are compatible with the auxiliary mounting pads on
Series 42 pumps. For auxiliary pad dimensions, see below table.
C
max.

B
max.

Without
Undercut

Mounting
FlangeWith
Undercut

Em ax.
Dm ax.
R 0.8 (.03)
max.
Coupling

F min.
2.3 (.09)
Cutter clearance0¯ P -0.05(+.000)(-.002)

Spline Engagement
for TorqueP001614E

Auxiliary pump mating dimensions
Pad Size

P

B

C

D

E

F

SAE A mm [in]82.55 [3.250]

8.1 [0.32]

12.7 [0.500]

44 [1.73]

15 [0.59]

13.5 [0.53]

SAE B mm [in]101.6 [4.000]

11.4 [0.45]

15.2 [0.60]

46 [1.81]

17.5 [0.69]

14.2 [0.56]

Control Selection
Series 42 pumps use a servo control system with a vairety of control options. Manual and Electric
Displacement Controls (MDC, EDC and HC-EDC) are feedback controls that provide and maintain a set
displacement for a given input. The MDC includes options for a Neutral Start Switch (NSS), backup alarm ,and a solenoid override to neutral. Non- Feedback Proportional Electric or Hydraulic controls (NFPE,
NFPH) and Forward-Neutral- Reverse (FNR) controls are available to control the pump without
mechanical feedback.

© Danfoss | February 2021

BC152886484146en-000109 | 29

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
All controls provide smooth, stepless positive control of the transmission in either direction. Optional
servo supply and drain orifices are available for special response needs.
Typical Control Applications
MachineRoller/compactor

Asphalt paver

NFPE

HC-EDCEDC

Conveyor drive
PropelUtility tractor

PropelWindrower

PropelPropelChain drive

Ag sprayer

PropelSpecialized
harvesters(sod, fruit, nut, etc.)

PropelCommercial mower

PropelRock drill

PropelAuxiliary drive

Drill drive
Pull downe
PropelFan

Aerial lift

PropelFork lift

PropelBrush / stump cutter

NFPH

PropelPropelSweeper

FNR

Vibratory drive

Articulated loader

Drill rig

MDC

PropelSkid steer loader

Trencher30 | © Danfoss | February 2021

Function

PropelCutter drive

Airport vehicle

PropelDumper

PropelBC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Manual Displacement Control (MDC)
The Manual Displacement Control (MDC) converts a mechanical input signal to a hydraulic signal. The
hydraulic signal positions the servo piston, tilting the swashplate to vary the pump’s displacement andflow direction.
The position of the swashplate is proportional to the mechanical input signal. The control has mechanicalfeedback that regulates the servo valve in relation to swashplate position to maintain displacement at
the commanded level regardless of changes in system pressure.
The servo control valve has variable geometry porting to regulate swashplate response relative to input
command. The control performs small displacement change commands with maximum controllability
throughout the entire stroking range of the pump. It completes large displacement change commands
with rapid swashplate response. Optional servo supply and drain orifices are available for special
response needs.
The control also has a full over-travel spool that allows input at a faster rate than swashplate movement
without damage to the control. Any swashplate position error is fed back to the servo valve for instantcorrection.
Features and Benefit of MDC

•
•
•
•
•
•
•

The MDC is a high gain control: Small movements of the control handle move the servo valve to fullopen position porting maximum flow to the servo cylinder.
The full over-travel spool design allows rapid changes in input signal without damaging the control
mechanism.
The MDC provides a fast response with low input force.
Precision parts provide repeatable and accurate displacement settings.
Mechanical feedback maintains pump displacement regardless of changes in system pressure.
The operator is isolated from swashplate vibration.
The swashplate and servo cylinder, as well as the control valve, are spring centered so the pump
returns quickly to neutral in the absence of control input.

The pump returns to neutral:• if the prime mover is shut down;••

if the external control linkage fails at the control handle;
if there is a loss of charge pressure.

Control Input Signal
Moving the control handle to maximum displacement requires a torque of 1.36 ± 0.23 N•m [12 ± 2 in•lbf].
To prevent damage to the control, provide stops in the linkage to limit maximum travel torque.
Maximum allowable input torque is 17 N•m [150 in•lbf].
Handle Angle Required for Swashplate Position
Swashplate position (see graphs)
Configulation© Danfoss | February 2021

Swashplate movement begins(point a)

Full Displacement reached(point b)

Linear - standard

5.3°

28°

Linear - narrow

4.0°

24°

BC152886484146en-000109 | 31

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Pump Displacement Versus Control Lever Rotation
33° Maximum-b

Lever rotation-a33° Maximum

a

b

CW

Displacement

CCW

100%

100%
P100405E

Response TimeYou can tailor the time to change from zero to maximum displacement using orifices incorporated in thegasket between the control and pump housing. Using orifices you can match swashplate response to theacceleration and deceleration requirements of your application. Verify proper orifice selection by testing.
MDC Response Time (Maximum to Maximum)
Frame size (cm3)

Fast (no orifice)MediumSlow (standard)

28/32

0.5 sec

1.3 sec

2.5 sec

41/51

0.6 sec

1.6 sec

2.5 sec

Neutral to maximum swashplate response is approximately 60% of the time for maximum to maximum
sawashplate travel. For other response times please contact your Danfoss representative.
MDC Schematic

M4
M5

P100404E

32 | © Danfoss | February 2021

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Cross-section of MDC
Servo Piston

Feedback
Linkage

Servo Control
Valve MDC Handle
Charge Pressure

P100403E

Control Handles
Either straight or clevis (offset) style control handles are available for the MDC. The straight style handle
minimizes the overall height of the pump and control. The clevis style handle provides additional
clearance between the handle and control housing and works well for clevis style linkage installations.
Maximum allowable input torque at the control handle is 17 N•m (150 lbf•in). The maximum allowablebending moment is 4 N•m (35 in•lbf ).
Pump Flow Direction with MDC
Input Shaft Rotation

CW

CCW

Handle of rotation

CW

CCW

CW

CCW

Port A flow

Out

In

In

Out

Port B flow

In

Out

Out

In

High pressure servo guage port

M4

M5

M4

M5

MDC Handle Options

P100407E

Electric Solenoid Override to Neutral
This normally open solenoid valve (C) shunts both ends of the servo piston. This prevents the pump fromstroking. When energized, the valve closes, allowing the pump to operate normally. This option is ideallysuited for operator presence or auto-resume functions without prime mover shut down. This solenoid isavailable in 12 or 24 Vdc with 2 Amp. maximum current draw. It is available with DIN 43650 terminals orwith a Packard Weather-Pack 2-way shroud connector.

© Danfoss | February 2021

BC152886484146en-000109 | 33

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Emergency Override to Neutral with Port for Brake Pressure Release
This solenoid valve (C) operates as the override to neutral above, and drains a spring-applied,hydraulically-released brake (port X7). Energizing the valve allows the pump to operate as normal, while
also charging port X7 to release the brake. This option is ideally suited for emergency stop functions
without prime mover shut down. The solenoid is available in 12 or 24 Vdc with 2 Amp. maximum current
draw. It is available with DIN 43650 terminals or with a Packard Weather-Pack 2-way shroud connector.
Electric Override to Neutral Specifications
Solenoid State at Override Activation

De-energized

Voltage12 or 24 Vdc

Maximum Current

2A

Hydraulic Schematic for MDC with Override Options

M4
M5

X7

C

P106555

34 | © Danfoss | February 2021

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Neutral Start Switch (NSS)This option provides an electrical switch contact that is closed when the control handle is in its neutral(0°) position. The switch contact opens when the control handle rotates approximately 1.5° to 2°
clockwise (CW) or counterclockwise (CCW) from neutral.
The switch is rated for 5 Amp. inductive load at 12 or 24 Vdc. It is available with screw terminals (noconnector) or with a Packard Weather-Pack 2-way tower connector.
Wire the NSS in series with the engine starting circuit to ensure the pump is in neutral position before
allowing the engine to start.
Neutral Start Switch Specifications
Switch Neutral Position

ClosedVoltage12 or 24 Vdc

Current Rating

5A

Neutral Play± 2°

NSS with Back-up Alarm (BUA) Switch
The BUA switch contact is open until the control handle rotates 2.6° to 3.75° from neutral. The BUA switch
closes when the control handle rotates either clockwise (CW) or counterclockwise (CCW) from neutral(choose one direction only). The NSS function operates as described above.
The BUA contacts are rated for 2.5 Amp. resistive load at 12 or 24 Vdc. The NSS contacts are rated for 5
Amp. inductive load at 12 or 24 Vdc. This switch is available with screw terminals (no connector) or with a
Packard Weather-Pack 4-way tower connector.
Wire the NSS as described above. Wire the BUA switch in series with a back-up alarm to have the alarmsound when the operator moves the pump control handle into reverse.
Neutral Start Switch Specifications© Danfoss | February 2021

Switch Neutral Position

ClosedVoltage12 or 24 Vdc

Current Rating

5A

Neutral Play

± 2°

BC152886484146en-000109 | 35

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Connectors
For available connectors and dimensions, see outline drawings: Manual Displacement Control Options.
Hydraulic schematic for MDC with override options
and NSS(A) = Backup alarm switch contacts (green wire)(closed in reverse)(B) = Neutral start switch w/ backup alarm(C) = Electric solenoid override to neutral w/
brake release

M4(D) = Neutral start switch contacts (black wire)(closed in neutral)

M5

B
D
A

X7

C

P100408E

36 | © Danfoss | February 2021

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Electrical Displacement Control (HC-EDC)
The High Current Electrical Displacement Control (HC-EDC) uses two Proportional Pressure Reducing
Valves (PPRV) to provide reducing pilot pressure. The PPRV converts an electrical input signal to a
hydraulic input signal to operate a spring centered sensing piston. The sensing piston produces amechanical input to the servo control valve in the pump housing, which ports hydraulic pressure toeither side of the servo piston.
The position of the swashplate is proportional to the electrical input signal. The control has mechanicalfeedback that regulates the servo valve in relation to swashplate position to maintain displacement at
the commanded level regardless of changes in system pressure. Any swashplate position error is fed backto the servo control valve for instant correction.
The servo control valve has variable geometry porting to regulate swashplate response relative to input
command. The control performs small displacement change commands with maximum controllability
throughout the entire stroking range of the pump. It completes large displacement change commands
with rapid swashplate response. Optional servo supply and drain orifices are available for special
response needs.
Cross-section of HC-EDC
Servo Piston

Feedback
Linkage

Servo Control
Valve
Sensing
PistonCharge Pressure

SOL B(Lower)SOL A(Upper)

Proportional Pressure
Reducing Valve PPRV© Danfoss | February 2021

BC152886484146en-000109 | 37

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
HC-EDC Hydraulic Schematic

M4
M5

X2

X1

SOL B
(Lower)SOL A(Upper)P400675

Pump Flow Direction with HC-EDC
Input Shaft Rotation

CW

CCW

Solenoid energized

A

B

A

B

Port A flow

Out

In

In

Out

Port B flow

In

Out

Out

In

High pressure servo guage port

M4

M5

M4

M5

High pressure EDC pilot gauge

X2

X1

X2

X1

Features and Benefits of HC-EDC

•
•
•
•
•
•
•

HC-EDC is a control driven by a pair of Proportional Pressure Reducing Valves (PPRV).
The control requires Pulse Width Modulation(PWM) with a recommended 200Hz signal.
PWM allows for more precise control of current to the proportional solenoids.
A full over-travel servo valve allows rapid changes in input signal voltages without damaging thecontrol mechanism.
Precision parts provide repeatable and accurate displacement settings.
The swashplate and servo piston, as well as the servo control valve, are spring centered so the pump
returns quickly to neutral in the absence of control input.
Simplified Control Design.

The pump returns to neutral:• if the prime mover is shut down;••

38 | © Danfoss | February 2021

if the control input signal is lost;
if there is a loss of charge pressure;

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Response TimeYou can tailor the time to change from zero to maximum displacement using orifices incorporated in thegasket between the control and pump housing. Using orifices you can match swashplate response to theacceleration and deceleration requirements of your application. Verify proper orifice selection by testing.
Neutral to maximum swashplate response is approximately 60% of the time for maximum to maximum
sawashplate travel. For other response times please contact your Danfoss representative.
HC-EDC Response Time (maximum to maximum)© Danfoss | February 2021

Frame size (cm3)

Fast (no orifice)MediumSlow (Standard)

28/32

0.5 sec.

1.3 sec.

2.5 sec.

41/51

0.6 sec.

1.6 sec.

2.5 sec.

BC152886484146en-000109 | 39

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Control Input Signal
The figure and table below relate the input electrical signal to pump displacement, (swashplate position),for each coil configuration.
Pump displacement versus Electrical signal

100%

-a
Displacement

-b

a

b

100%
P001015E

Control Signal Requirements
Control current
Voltage

a*
mA

b
mA

12V

300

750

24V

150

375

Pin
connection
any other* Factory test current, for vehicle movement or application actuation expect higher value.

Coil Specifications
Voltage (V)

12 vdc24 VdcRated current at 20°C [68 °F]

1330 mA

665 mA

Rated power

16 W

16 W

Coil resistance at 20°C [68 °F]

9Ω

36 Ω

Coil resistance at 60°C [140 °F]

12.4 Ω

49.7 Ω

PWM frequency range

100 - 200 Hz

100 - 200 Hz

Recommended PWM frequency

200 Hz200 HzConnectors and Port locations
Refer to Electrical displacement control (HC-EDC) options on page 66:

40 | © Danfoss | February 2021

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Electrical Displacement Control (EDC)
The Electrical Displacement Control (EDC) uses an electrohydraulic Pressure Control Pilot (PCP) stage toprovide a differential pilot pressure. The PCP stage converts an electrical input signal to a hydraulic input
signal to operate a spring centered sensing piston. The sensing piston produces a mechanical input tothe servo control valve which ports hydraulic pressure to either side of the servo piston. The servo piston
operates the swashplate varying the pump’s displacement and flow direction.
The position of the swashplate is proportional to the electrical input signal. The control has mechanicalfeedback that regulates the servo valve in relation to swashplate position to maintain displacement at
the commanded level regardless of changes in system pressure. Any swashplate position error is fed backto the servo valve for instant correction.
The servo control valve has variable geometry porting to regulate swashplate response relative to input
command. The control performs small displacement change commands with maximum controllability
throughout the entire stroking range of the pump. It completes large displacement change commands
with rapid swashplate response. Optional servo supply and drain orifices are available for special
response needs.
Cross-section of EDC
Servo Piston

Feedback
Linkage

Servo Control
Valve
Sensing
PistonCharge Pressure

EDC Assembly
MS Connector
PCP Valve
Lead Wires for
Packard Connector© Danfoss | February 2021

BC152886484146en-000109 | 41

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
EDC Hydraulic Schematic

M4
M5

X2

X1

P100410E

Pump Flow Direction with EDC
Input Shaft Rotation

CW

CCW

Voltage to pin:

A (C)

B (D)

A (C)

B (D)

Port A flow

Out

In

In

Out

Port B flow

In

Out

Out

In

High pressure servo guage port

M4

M5

M4

M5

High pressure EDC pilot gauge

X2

X1

X2

X1

Features and Benefits of EDC

•
•
•
•
•
•
•
•

The EDC is a high gain control. Small changes in input current move the servo valve to full open
position porting maximum flow to the servo cylinder.
Silicon oil filled pilot stage lengthens control life by preventing moisture ingression and dampening
component vibrations.
The majority of all EDC’s are equipped with dual coil pilot stages. With the dual coil EDC, you may use
a single coil or both coils, either in series or in parallel.
A full over-travel servo valve allows rapid changes in input signal voltages without damaging thecontrol mechanism.
Precision parts provide repeatable and accurate displacement settings.
Mechanical feedback maintains pump displacement regardless of changes in system pressure.
The control does not require Pulse Width Modulation (PWM), although performance is optimum
using a 200 Hz signal.
The swashplate and servo piston, as well as the servo control valve, are spring centered so the pump
returns quickly to neutral in the absence of control input.

The pump returns to neutral:

42 | © Danfoss | February 2021

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options•••

if the prime mover is shut down;
if the control input signal is lost;
if there is a loss of charge pressure;

Response TimeYou can tailor the time to change from zero to maximum displacement using orifices incorporated in thegasket between the control and pump housing. Using orifices you can match swashplate response to theacceleration and deceleration requirements of your application. Verify proper orifice selection by testing.
Neutral to maximum swashplate response is approximately 60% of the time for maximum to maximum
sawashplate travel. For other response times please contact your Danfoss representative.
EDC Response Time (maximum to maximum)
Frame size (cm3)

Fast (no orifice)MediumSlow (Standard)

28/32

0.5 sec.

1.3 sec.

2.5 sec.

41/51

0.6 sec.

1.6 sec.

2.5 sec.

Control Input Signal
The table relates input signal to swashplate position for each coil configuration.
Pump displacement versus Electrical signal

100%

-a
Displacement

-b

a

b

100%
P001015E

Connectors and Port locations
Refer to Electrical displacement control (EDC) options on page 67
Coil options
EDC signal required for swashplate position
Swashplate position© Danfoss | February 2021

Coil configuration

Movement begins(point a) mA at VDCFull displacement
reached(point b) mA at VDC

Pin connection

Single coil

18 ± 885 ± 20

A+B or C+D

Dual coil in series

7±3

54 ± 5

A+D (connect C+B)

Dual coil in parallel

18 ± 885 ± 20

AC+BD

BC152886484146en-000109 | 43

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
EDC Input Impedance
Coil type

Normal current

Coil resistance at 24 °C [75 °F]

Coil A/B: 20 Ω
Coil C/D: 16 ΩResistance at 104°C [220 °F]

Coil A/B: 24 Ω
Coil C/D: 20 Ω

Maximum input current

350 mA at 6 Vdc

Non-Feedback, Proportional Hydraulic (NFPH) Control
The Non-Feedback Proportional Hydraulic (NFPH) control is a hydraulic displacement control in which an
input signal pressure directly controls the pump servo piston to set pump displacement.
Series 42 pumps with NFPH control have a special servo cylinder capable of providing proportional
control with a hydraulic input.
Swashplate position is proportional to the differential signal pressure at ports X1 and X2, butdisplacement is also dependent on pump speed and system pressure. This characteristic of non-feedback
controls provides a natural power limiting function by reducing the pump swashplate angle as systempressure increases. The accompanying graph shows typical operating characteristics.
Pump displacement versus signal pressure

Non-feedback proportional hydraulic control
schematic

Servo piston

M4
M5

Piston centering spring
P100412E

X1

X2
P100413

Pump Flow Direction with NFPH control

44 | © Danfoss | February 2021

Input Shaft Rotation

CW

CCW

High pressure at port:

X1

X2

X1

X2

Port A flow

Out

In

In

Out

Port B flow

In

Out

Out

In

High servo guage port

M4

M5

M4

M5

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
NFPH pump displacement to Input signal

6

ar
5b
tem
=3
4

sys
Dp

Dp

Displacement

ba
r

5b

tem
=3
5
sys

tem
=3
4

Dp

sys
Dp

sys

Signal Dp (bar)
15
6
ar

18

tem
=3
5

ba
r

100%

15

18

100%
P001628E

Features and Benefits of the NFPH control

•
•
•
•

Eliminates mechanical linkage for flexibility of control design
Power limiting characteristic reduces machine power requirements
Compatible with dual axis joysticks for dual path applications
Smooth operation

Connectors and Port locations
Refer to Non-feedback proportional hydraulic (NFPH) control options on page 64© Danfoss | February 2021

BC152886484146en-000109 | 45

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Non-Feedback, Proportional Electric (NFPE) Control
The Non-Feedback Proportional Electric (NFPE) control is an electric control in which an electric input
signal activates one of two solenoids that port charge pressure to either side of the servo piston.
Series 42 pumps equipped with NFPE control have a special servo cylinder capable of providing
proportional control with an electric input.
Swashplate position is proportional to the input signal current, but displacement is also dependent on
pump speed and system pressure. This characteristic of non-feedback controls provides a natural power
limiting function by reducing the pump swashplate angle as system pressure increases. The
accompanying graph shows typical operating characteristics.
NFPE hydraulic schematic

NFPE Control on Series 42 pump (for 28cc)

M4
M5

A
B

P100420A

B

P100416E

Pump Flow Direction with NFPE control
Input Shaft Rotation

CW

CCW

Solenoid energized:

A

B

A

B

Port A flow

Out

In

In

Out

Port B flow

In

Out

Out

In

High servo guage port

M4

M5

M4

M5

NFPE pump displacement to Input signal

Displacement

=3
tem
sys

Dp

Dp

sys

tem

=3

45

5b
a

r

ba

r

650

=3
tem
sys

Dp

sys
Dp

Signal current mA (dcavg)
1400 1000
650

tem

=3

45

5b

ba
r

ar

100%

1000 1400

100%
P100417E

46 | © Danfoss | February 2021

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Features and Benefits of the NFPE control

•
•
•
•

Proportional electric control
Eliminates mechanical linkage for flexibility of control design
Power limiting characteristic reduces machine power requirements
Smooth operation

Input Signal Requirements
The NFPE control requires a 200 Hz Pulse- Width-Modulated (PWM) input current to optimize
performance. The minimum PWM frequency is 80 Hz. Coil resistance is 5.6 Ω at 22°C. Limit current to 1.5A
(12V dc)
The NFPE control uses AMP Junior Power Timer connectors. The solenoids are compatible with Danfoss
microprocessors, electric circuit boards, and control handles.
Connectors and Port locations
Refer to Non-feedback proportional electric (NFPE) control options - FRAME SIZE 28/32 on page 65 andNon-feedback proportional electric (NFPE) control options - FRAME SIZE 41/51 on page 65© Danfoss | February 2021

BC152886484146en-000109 | 47

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Forward, Neutral, Reverse (FNR) Control
The Forward-Neutral-Reverse (FNR) control uses a solenoid-operated 3-position, 4-way valve to control
pump displacement and flow direction. The FNR control is a nonfeedback, non-proportional, 3-position
control.
When a solenoid is energized, charge pressure flows to one end of the pump servo piston, which strokes
the swashplate to maximum angle. Which solenoid is energized determines the direction of pump flow(see table).
FNR hydraulic schematic

FNR on Series 42 (for 41/51cc)

Solenoid a

M4
M5

a

b

Solenoid b

P100419E
P400673

Pump Flow Direction with FNR control
Input Shaft Rotation

CW

CCW

Solenoid energized:

a

b

a

b

Port A flow

In

Out

Out

In

Port B flow

Out

In

In

Out

High pressure servo guage port

M5

M4

M5

M4

Pump displacement to Electrical signal
100%

Displacement

Current mA(Solenoid b)

Current mA(Solenoid a)

100%
P001635E

48 | © Danfoss | February 2021

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Features and Options
Features and Benefits of FNR control

•
•
•
•
•

Electric control
If voltage is lost, the pump returns to neutral
If charge pressure is lost, the pump returns to neutral
Simple, low-cost design
Ideal for applications that do not require proportional control

Input Signal Requirements
The solenoids are available in 12 or 24 Vdc. Maximum power is 30 Watts. They are available with DIN
43650 terminals. An AMP Jr. Power Timer connector is also available.
Connectors and Port locations
Refer to Electric control (FNR) options - FRAME SIZE 28/32 on page 61 and Three-position electric control(FNR) options - FRAME SIZE 41/51 on page 62© Danfoss | February 2021

BC152886484146en-000109 | 49

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings
Frame Size 28/32
Base unit with manual displacement control (MDC) - Port/Housing Style A
84.2[3.31]
Spot face (M5) 5.1[0.2]

114.42[4.5]
101.69[4]
Spot face (M4)97.9
[3.85]
Servo pressuregauge port (M4 & M5)
port M5 on opposite side
0.5625-18 UNF-2B thread
Approx. centerof gravity+0.25
Ø14.3 -0.13+0.010[0.563-0.005 ]2x+0Ø101.6 -0.05+0.000[4.000]-0.002

CCW

CW

110
[4.33]

Displacement
limiter side 1
option A

69[2.72]

33.6[1.32]

Charge pressuregauge port (M3)0.5625-18 UNF-2B thread
Charge pressure
supply for no
charge pump option
0.750-16 UNF-2B thread

30.6
[1.2]

4mm
Internal HEX68[2.68]

37[1.46]

75.1[2.96]

82.62[3.25]

73[2.87]
2x78[3.07]
Spot face (L2)102
[4.02]
Spot face (L1)

System pressurecheck relief valve
port (B)

Case drain port (L1)
1.0625-12 UN-2B thread

Charge inlet port (S)1.0625-12 UN-2B

R1 max[0.039]9.7 ±0.1[0.382 ±0.004]

120.1 Max
[4.73]

Pump centerline

12.5[0.49]
49.7[1.96]

System pressurecheck relief valve
port (A)
107.2[4.22]

144.5 max. [5.69]
138.82[5.47]
126[4.96]

147.7[5.81]

199.9[7.87]

P100421E

Servo cover used withhigh force neutral return(NFP special features)
Charge pressure relief valve
1 1/16 in EXT HEX
1/2 in EXT HEX*All SAE straight thread O-ring ports per SAE J1926/ISO 11926-1, unless otherwise specified.
Determine rotation by viewing pump from the input shaft end. Contact your Danfoss representative for
specific installation drawings.
Adjustable displacement limiters

50 | © Danfoss | February 2021

Shaft Rotation

CW

CCW

Displacement limiter side

1

2

1

2

Limited flow through port

B

A

A

B

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings

29.23[1.15]
107.1 max
[4.22]

93.45[3.68]

17mm EXT HEX
5mm INT HEX
Neutral adjust

37.6[1.48]
Displacement limiterside 2
option A

Lifting bracket
System pressuregauge port (M2)
0.5625-18 UNF-2B thread

4mmInterbal HEX

System pressure port (B)1.0625-12 UNF-2B thread

163[6.42]

93[3.66]

22.7[0.89]
2x31[1.22 ]
31
[1.22 ]

31
[1.22]

System pressure port (A)1.0625-12 UNF-2B thread
Case drain port (L2)
1.0625-12 UNF-2B thread
83.5[3.29]
Spot face charge
inlet port (S)88.1[3.47]
Spot face chargepressure gauge port

© Danfoss | February 2021

78
[3.07]
Spot face systempressure ports (A&B)
80.5[3.17]
Spot face systempressure gauge ports (M1&M2)

System pressuregauge port (M1)
0.5625-18 UNF-23 thread

122.2[4.81]

57.7[2.27]
P100422E

152.7[6.01]BC152886484146en-000109 | 51

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings
Frame Size 41/51
Base unit with manual displacement control (MDC) - Port/Housing Style A
82.2[3.24]
Spot face (M5)4[0.16]

126.4[4.98]
109.4[4.31]
Spot face (M4)105.8
[4.17]
35.6[1.40]
33.6[1.32]

Servo pressuregauge port (M4)0.5625-18 UNF-2B thread

Approx.
center ofgravity+0.25
Ø14.3 -0.13+0Ø101.6 -0.05+0.000[4.000 -0.002 ]CWCharge pressure
supply for no
charge pump option
0.750-16 UNF-2B thread

Displacement
limiterside 1
option 'A' or '1'+0.010 120[0.563]-0.005[4.72]
2X
CCW

Charge pressure gauge port
0.5625-18 UNF-2B thread

4mmInternal HEX
72[2.83]

37[1.46]

System pressure check
relief valve port (B)37[1.46]

81.1[3.19]

82.62[3.25]

Charge inlet port (S)1.3125-12 UN-2B thread
R1 max[0.039]73[2.87]
96.7[3.81]
Spot face (A&B)
105.1 max
[4.14]

85[3.35]
Spot face (L2)9.7 ±0.1[0.382 ±0.004]

73[2.87]
101[3.98]
Spot face (L1)

Case drain port (L1)
1.3125-12 UN-2B thread

127.8 max
[5.03]

System pressure check
relief valve port (A)12.5[0.49]
59[2.32]

165.7[6.52]

219.17[8.63]

P100423E

Pump centerline
159.6[6.28]
158.2[6.23]
141.2[5.56](101)[3.98]
Spot face (L1)

Servo cover used with highforce neutral return(NFP special features)
Charge pressure
relief valve
1 1/16 in EXT HEX
1/2 in EXT HEX

85.5[3.37]
Spot face (M1&M2)

81[3.19]
Charge pressuregauge port

*All SAE straight thread O-ring ports per SAE J1926/ISO 11926-1, unless otherwise specified.
Determine rotation by viewing pump from the input shaft end. Contact your Danfoss representative for
specific installation drawings.
Adjustable displacement limiters

52 | © Danfoss | February 2021

Shaft Rotation

CW

CCW

Displacement limiter side

1

2

1

2

Limited flow through port

B

A

A

B

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings

29.23[1.15]

103.45[4.07]

42.6[1.68]
33.6[1.32]
17mm EXT HEX
5mm INT HEX
Neutral adjust(Optional)
System pressuregauge port (M2)
0.5625-18 UNF-2B thread

Servo pressuregauge port (M5)0.5625-18 UNF-2B thread

Displacement limiterside 2
option 'A' or '1'

Lifting bracket

4mm
Internal HEX

System pressure port (B)1.0625-12 UN-2B thread72[2.83]
38.5[1.52]
38.5[1.52]

34[1.34]

22.7[0.89]
22.7[0.89]

Case drain port (L2)1.3125-12 UN-2B thread

System pressure port (A)1.0625-12 UN-2B thread88[3.46]
Spot face charge inlet port (S)© Danfoss | February 2021

99
[3.9]

103
[4.06](Optional)
System pressuregauge port (M1)
0.5625-18 UNF-2B thread69[2.72]

P100424E

128.2[5.05]
165.7[6.52]
Housing port options 'A', 'B', and 'R'(SAE threaded O-ring boss)

BC152886484146en-000109 | 53

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings
Shaft Options
40.6
[1.6]

46
[1.81]
32.6 ± 0.6[1.29 ± 0.02]

8 ± 1.1[0.31 ± 0.04]

38 ± 1.1[1.5 ± 0.04]

8 ± 1.1[0.31 ± 0.04]

16.7 ± 0.5[0.66 ± 0.02]
Full spline
13 teeth 16/32 pitch
30° pressure angle
20.6375 pitch diameter
fillet root side fit
ANSI B92.1-1970 CLASS 5
Also mates withflat root side fit

Ø 19.13 max[0.753]23.4 ± 0.5[0.92 ± 0.02]
Full spline
15 teeth 16/32 pitch
30° pressure angle
23.813 pitch diameter
fillet root side fit
ANSI B92.1-1970 CLASS 5
Also mates withflat root side fit

Ø 22.13 max[0.87]

Ø 22.16 ± 0.09
[0.872 ± 0.003]

Ø 25.34 ± 0.06
[0.9976 ± 0.0024]

R2.7 ± 0.4[0.11 ± 0.02]

R2.7 ± 0.4[0.11 ± 0.02]

Coupling must not protrude
beyond this point

Coupling must not protrude
bey ond this point

OPTION C: SPLINED SHAFTOPTION D: SPLINED SHAFT
78[3.07]

63.5[2.5]
55 ± 0.6[2.17 ± 0.02]

8.5 ± 1.1
[0.335 ± 0.043]

8 ± 1.1[0.31 ± 0.04]+06.35 -0.05+0.00[0.250 -0.002 ]SQ. Key x 38.1 LG

70 ± 0.6[2.75 ± 0.02]

33.8 ± 0.5[1.331 ± 0.02]
Full spline
19 teeth 16/32 pitch
30° pressure angle
30.163 pitch diameter
fillet root side fit
ANSI B92.1-1970 CLASS 5
Also mates withflat root side fit

Ø 27.83 max[1.1]

Ø 31.24 ± 0.09
[1.23 ± 0.0035]

Ø 25.37 ± 0.025[0.999 ± 0.01]

R2.7 ± 0.4[0.11 ± 0.02]
Coupling must not protrude
beyond this point
3

OPTION E: SPLINED SHAFT (41/51 cm models only)

Coupling must not protrude
bey ond this point

OPTION G: STRAIGHT ROUND KEY
P100588E

54 | © Danfoss | February 2021

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings
Filtration Options
Suction filtration adapter - option G
Suction filtration adapter - option G
G

16[0.63]

E

Charge pressure gauge port M3
0.5625-18 straight thread O-ring boss

P100425E

Lettered dimensions© Danfoss | February 2021

Frame size

E

G

28/32

90.7[3.57]

113 [4.45]

41/51

101[3.97]

118.5 [4.67]

BC152886484146en-000109 | 55

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings
Charge pressure filtration adapter - full filter flow - option B

53.5[2.11]

16[0.63]J
Inlet from filter
port E
0.875-14 straightthread O-ring boss

Outlet to filter
port D
0.875-14 straightthread O-ring boss

D
Charge pressuregauge port M3
0.5625-18 straightthread O-ring boss

H
2x

E

P400150

Lettered dimensions

56 | © Danfoss | February 2021

Frame size

D

E

H

J

28/32

105.7 [4.16]

91.2 [3.59]

112.4 [4.43]

123.3 [4.85]

41/51

116 [4.57]

101.5 [4.00]

117.9 [4.64]

128.8 [5.07]

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings
No charge pump - option X

53.5[2.11]

16[0.63]
K
Charge supply forno charge pump
0.875-14 straightthread O-ring boss

E

D

H
2x

Charge pressuregauge port M3
0.5625-18 straightthread O-ring boss

J

P100437E

Lettered dimensions
Frame size

D

E

H

J

K

28/32

105.7 [4.16]

91.2 [3.59]

112.4 [4.43]

123.3 [4.85]

125.7 [4.95]

41/51

116 [4.57]

101.5 [4.00]

117.9 [4.64]

128.8 [5.07]

131.3 [5.17]

Charge pressure filtration - full filter flow (no adapter) - option F
55[2.17]
Outlet to filter port
0.875-14 straightthread O-ring boss

15 [0.59]

Charge pressuregauge port M3
0.5625-18 straightthread O-ring boss

Inlet from filter port
“F” straightthread O-ring boss

E
D
2X

J
H

MountingflangeG© Danfoss | February 2021

P400151

BC152886484146en-000109 | 57

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings
Lettered dimensions

58 | © Danfoss | February 2021

Frame size

D

E

F

G

H

J

28/32

87.6 [3.45]

91 [3.58].875 -14

114.42 [4.5]99.7 [3.93]

129.2 [5.09]

41/51

93.5 [3.68]

95.3 [3.75].750 -16

122.12 [4.81]

110 [4.33]

141 [5.55]

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings
Control Modules
Manual displacement control (MDC) options
Displacement
limiter side 1
option A or 1

Pump centerline
External brake supply (X7)
0.5625-18 straightthread O-ring boss
MC
Displacement
limiter side 2
option A or 1

MH
MX
MY

VIEW U(LEFT SIDE VIEW)

MS
V

A

B

Solenoid plug face for
DIN 46350 connector

Danfossmating parts kit
No. K09129

A
B
Packard weather-pack
2-way connector(male terminals)

2

1

Deutsch connector
2-way connector(receptacle terminal)
DT04-2P

Danfossmating parts kit
No. K03383(female terminal)

Mounting flange

VIEW V(RIGHT SIDE VIEW)
MN

Mounting flange

Option A-K
electric neutral overrideand brake release
Option 1, 2
neutral start switch

Option 3-8
neutral start switch
and backup alarm

50.8[2.00]

165 ref[6.5]
wire length85.4 [3.36]
Spot facedepthMB
165 ref[6.5]
wire length

U

Danfossmating parts kit
No. K29657(plug terminal)
DT06-2STOP VIEWVARIABLE PUMP W/ DISPLACEMENT LIMITERS

ELECTRIC NEUTRAL OVERRIDEAND BRAKE RELEASE CONNECTORS

A
B
C
D

8–32 machine screws

Packard weather-pack
4-way tower connector(female terminals)
4
3

1
2

Deutsch connector
4-way connector(receptacle terminal)
DT04-4P

Danfossmating parts kit
No. K03379(male terminals)

Danfossmating parts kit
No. K23511(plug terminals)
DT06-4S

Terminals 1&2, A&B (Neutral Start)
Normally “ON” Switch
Wire Color Black
Terminals 3&4, C&D (Backup Alarm))
Normally “OFF” Switch
Wire Color Green

Neutral start switch
with no connector(screw terminals)

A
B

Packard weather-pack
2-way tower connector(female terminals)

NEUTRAL START
SWITCH AND BACKUP ALARM

Danfossmating parts kit
No. K03377(male terminals)

NEUTRAL START
SWITCH CONNECTORS
P100431E

Manual displacement control dimensions© Danfoss | February 2021

Frame size

MB

MC

MH

MN

MS

MX

MY

28/32

177.4 [6.98]

127.2 [5.01]

169.4 [6.67]

175.4 [6.91]

192.7 [7.58]

94.3 [3.71]

152.8 [6.02]

41/51

187.4 [7.38]

144.2 [5.68]

186.4 [7.34]

185.4 [7.30]

202.7 [7.98]

104.3 [4.11]

162.8 [6.41]

BC152886484146en-000109 | 59

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings
Manual displacement control (MDC) options
R25.4 ± 0.2[1.00 ± 0.01]

R41.3 ± 0.2[1.62 ± 0.01]
R50.8 ± 0.12
[2.00]Max travel
33° Max displacement
28°
CCW
Neutral

15 N•m max[11 ft•lbf ] max

CW
28°
33° Max displacement

Ø 6.7 ± 0.12
[0.265 ± 0.005]
3 places

Max travel

17 N•m max [ LB-IN ] max
OPTION 1:
STANDARD HANDLE

Pump centerline

9.4 ± 0.25
[0.37 ± 0.01]

HB

R26.4 ± 0.2[1.04 ± 0.01]

R51.8 ± 0.2[2.04 ± 0.01]
Max travel
33° Max displacement
28°
CCW
Neutral

15 N•m max[11 ft•lbf ] max

CW
28°
33° Max displacement

Ø 8.26 ± 0.12
[0.325 ± 0.005]
3 places

OPTION 2:
CLEVIS HANDLE

HH
Pump centerline

7.5 ± 0.12
[0.295 ± 0.005]

Max travel
17 N•m max [ LB-IN ] max

CH

P100431E_2

Control handle dimensions
Frame size

HB

HH

CH

28/32

156.4 [6.16]

163 [6.42]

166.1 [6.54]

41/51

173.4 [6.83]

180 [7.09]

183.1 [7.21]*All SAE straight thread O-ring ports per SAE J1926/ISO 11926-1, unless otherwise specified.

60 | © Danfoss | February 2021

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings
Electric control (FNR) options - FRAME SIZE 28/32

A

Danfossmating parts kit
No. K09129

B

Solenoid plug face for
DIN 46350 connector

2

1

AMP Junior power timer*
2 pin connector(male terminals)

A

A

B

B

Danfossmating parts kit
No. K19815(female terminal)FNR CONNECTORS* Special temperature requirements,
see your Danfoss representative
when considering this option

U
TOP VIEWVARIABLE PUMP W/FNR CONTROLPH

PHOPTION FSTYLE 8OPTION FSTYLE 6&7
VIEW U(LEFT SIDE VIEW)

P100432E

Forward neutral reverse control dimensions
Frame size

Style

PH

28/32

Style 6 & 7

143.2 [5.64]

Style 8150.3 [5.92]

Pump flow direction with FNR control© Danfoss | February 2021

Input Shaft Rotation

CW

CCW

Solenoid energized

A

B

A

B

Port A flow

Out

In

In

Out

BC152886484146en-000109 | 61

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings
Pump flow direction with FNR control (continued)
Port B flow

In

Out

Out

In

High pressure servo gage port

M4

M5

M4

M5

Three-position electric control (FNR) options - FRAME SIZE 41/51

2

1

AMP Junior power timer*
2 pin connector(male terminals)

Danfossmating parts kit
No. K508388(female terminal)
TP

Solenoid a

FNR CONNECTORS

Mountingflange* Special temperature requirements,
see your Danfoss representative
when considering this option

TJ

107.5
[4.23]

TH

61.35[2.42]

61.35[2.42]
107.5[4.23]
Solenoid b

OPTION FSTYLE 5U

TOP VIEWVARIABLE PUMP W/FNR CONTROLVIEW U(LEFT SIDEVIEW)

P100434E

Forward neutral reverse control dimensions
Frame size

TP

TH

TJ

41/51

111.2 [4.38]

177.3 [6.98]

186.8 [7.35]

Pump flow direction with FNR control

62 | © Danfoss | February 2021

Input Shaft Rotation

CW

CCW

Solenoid energized

a

b

a

b

Port A flow

In

Out

Out

In

Port B flow

Out

In

In

Out

High pressure servo gage port

M5

M4

M5

M4

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings
Mounting flange

TN

Solenoid a
Mounting flange
107.5[4.23]
54.5[2.15]

52[2.05]
107.5[4.23]

Solenoid b
TP

OPTION FSTYLE 2&4

12 volt option

A

B

Solenoid olug face for
DIN 46350 connector

Danfossmating parts kit
No. K09129

24 volt option

TK TM

TH

FNR CONNECTORS
TJ* Special temperature requirements,
see your Danfoss representative
when considering this option

P400674

Forward neutral reverse control dimensions, 12 volt option
Frame size

TP

TH

TJ

41/51

145.2 [5.72]

178 [7.00]

152.3 [6.00]

Forward neutral reverse control dimensions, 24 volt option© Danfoss | February 2021

Frame size

TJ

TK

TM

TN

41/51

152.3 [6.00]

217 [8.54]

187 [7.36]

111.2 [4.38]

BC152886484146en-000109 | 63

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings
Non-feedback proportional hydraulic (NFPH) control options
Port X1
Mounting flange

NX

A

Port X2

A

NP

NF

0.5625-18 straight thread O-ring boss

NS

Pump centerline

A-A SECTION

P100433E

Non-feedback proportional hydraulic control dimensions
Frame size

NF

NS

NP

NX

28/32

76.6 [3.02]

111.3 [4.38]

33 [1.30]

46 [1.81]

41/51

88 [3.46]

128.3 [5.05]

31 [1.22]

54 [2.13]*All SAE straight thread O-ring ports per SAE J1926/ISO 11926-1, unless otherwise specified.
Determine rotation by viewing pump from the input shaft end. Contact your Danfoss representative for
specific installation drawings.

64 | © Danfoss | February 2021

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings
Non-feedback proportional electric (NFPE) control options - FRAME SIZE 28/32

PK

2

1

AMP Junior power timer
2 pin connector(male terminals)

Danfossmating parts kit
No. K19815(female terminals)
PH

A

A
B
Packard weather-pack
2-way connector(male terminals)

Danfossmating parts kit
No. K03383(female terminal)

B

NFPE CONNECTORUOPTION G
TOP VIEWVARIABLE PUMP W/NFPE CONTROLVIEW U(LEFT SIDE VIEW)
P100435E

Manifold height
Frame sizePHPK

28/32 (AMP Jr Power Timer)

150.7 [5.93]

203.4 [8.00]

41/51 (Packard Weather-Pack)

144.6 [5.69]

203.4 [8.00]

Non-feedback proportional electric (NFPE) control options - FRAME SIZE 41/51

A
2

1

AMP Junior power timer
2 pin connector(male terminals)

Danfossmating parts kit
No. K19815(female terminals)

101.5[4.00]

179.3[7.06]

NFPE CONNECTOR
101.5[4.00]BU

OPTION GSTYLE 1TOP VIEWVARIABLE PUMP W/NFPE CONTROLVIEW U(LEFT SIDE VIEW)

P400142

Pump flow direction with NFPE control© Danfoss | February 2021

Input Shaft Rotation

CW

Solenoid energized

A

CCW
B

A

B

BC152886484146en-000109 | 65

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings
Pump flow direction with NFPE control (continued)
Port A flow

Out

In

In

Out

Port B flow

In

Out

Out

In

High pressure servo gage port

M4

M5

M4

M5

Electrical displacement control (HC-EDC) options
SOL A
EK
SOL B
Mounting
Flange
EH
EG
EJ

EF

Control pressure
gage port (X1)
0.5625-18 straight thread
O-ring boss

Pump q

VIEW V
RIGHT SIDE VIEW

2

1

Deutsch connector
2-way connector(receptacle terminal)
DT04-2P

Danfossmating parts kit
No. K29657(plug terminal)
DT06-2S

Control pressure
gage port (X2)
0.5625-18 straight thread
O-ring boss

HC-EDC CONNECTOR

ED

EC

V
OPTION E2
HIGH CURRENT DISPLACEMENT CONTROL
4800669E

66 | © Danfoss | February 2021

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings
Electrical displacement control dimensions
Frame size

EC

ED

EF

EG

EH

EJ

EK

28/32

190.6 [7.5]52.7 [2.08]

157.0 [6.18]

189.5 [7.46]

196.5 [7.74]

132.6 [5.22]

94.4 [3.72]

41/51

200.6 [7.9]52.7 [2.08]

174.0 [6.85]

206.6 [8.13]

213.5 [8.41]

149.6 [5.89]

104.6 [4.12]*All SAE straight thread O-ring ports per SAE J1926/ISO 11926-1, unless otherwise specified.
Electrical displacement control (EDC) options
Control pressure
gage port (X2)
0.5625-18 straight thread
O-ring boss

99.7
[3.93]

EL

A
B
C
D

Packard weather-pack
4-way connector(male terminals)

D

A

C

B

MS connector
MS3102C-14S-2P

4
3

1
2

Deutsch connector
4-way connector(receptacle terminal)
DT04-4P

Danfossmating parts kit
No. K03384(female terminal)V

0.875—20 UNEF
MS3102C-14S-2P connector
mates with MS3106E-14S-2S
or MS3108E-14S-2S connector

TOP VIEWVARIABLE PUMP WITH EDC
MS CONNECTOR

Danfossmating parts kit
No. K08106(plug terminal)EP
Control pressure
gage port (X1)
0.5625-18 straight thread
O-ring boss

EX

Danfossmating parts kit
No. K23511(plug terminals)
DT06-4SEDC CONNECTORS

EH

EC

EJ

VIEW V
RIGHT SIDE VIEW
VARIABLE PUMP WITH EDC
MS CONNECTOROPTION E© Danfoss | February 2021

P100438E

BC152886484146en-000109 | 67

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings
Electrical displacement control dimensions
Frame size

EC

EH

EJ

EL

EP

EX

28/32

138.7 [5.46]

170.2 [6.70]]

138.7 [5.46]

188 [7.40]

165.7 [6.52]

119.9 [4.72]

41/51

155.7 [6.13]

187.2 [7.37]

155.7 [6.13]

198 [7.80]

175.7 [6.92]

129.9 [5.11]*All SAE straight thread O-ring ports per SAE J1926/ISO 11926-1, unless otherwise specified.
Speed Sensor Option

SH

SM

P100427E

Speed sensor height
Frame size

SH

SM

28/32

104.24 [4.1]

81.7 [3.22]

41/51

107.84 [4.25]

89.35 [3.52]

Speed sensor with Packard Weather-Pack connectore (KPPG13408)
Packard Weather-Pack
4 pin(Supplied Connector)
Red
White
Black
Green

A
B
C
D

(200)
P002108E

68 | © Danfoss | February 2021

Mating Connector
No.: K03379
Id.-No.: 505341

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Installation Drawings
Auxiliary Mounting Pads
SAE A (OPTION A, OPTION T, OPTION R)

O-ring seal required
Ref 82.22 [3.237] I.D. x
2.62 [0.103] Cross section
N spline′82.64 ± 0.038[3.254 ± 0.001]

106.4[4.19]

0.375-16 UNC-2BThread
13 [0.51] Minimum
full thread depth
4x′89.31[3.516]

R0.5 max[0.020]
Mounting flange

1.956 [0.08]

106.4[4.19]

8.1 [0.32]
D
Maximumshaft depthF

P100429E

SAE B (OPTION B, OPTION V)

O-ring seal required
Ref 94.97 [3.739] I.D.x
1.78 [0.070] cross section
N spline

146[5.75]

0.500-13 UNC-2BThread
18 [0.71] Minimum
full thread depth
4x′101.69 ± 0.038[4.004 ± 0.001]′105.71[4.16]
R0.9 max[0.035]
Mounting flange

146[5.75]

1.24 [0.05]
11.4 [0.45]
D
Maximumshaft depth

F

P400152*All SAE straight thread O-ring ports per SAE J1926/ISO 11926-1, unless otherwise specified.
Determine rotation by viewing pump from the input shaft end. Contact your Danfoss representative for
specific installation drawings.
Auxiliary mounting flange and coupling options© Danfoss | February 2021

Auxiliary mounting
flangeSpline pitch
diameter P

Number ofteeth N

28 cm3

Dimension D
41/51 cm3

28 cm3

Dimension F

Option A

14.288 [0.563]

9

44 [1.73]

44 [1.73]

211.59 [8.33] 230.89 [9.09]

Option T

17.463 [0.688]

11

44 [1.73]

44 [1.73]

211.59 [8.33] 230.89 [9.09]

41/51 cm3

Option B

20.638 [0.813]

13

46 [1.81]

46 [1.81]

213.3 [8.40]

232.6 [9.16]

Option V

23.813 [0.9375]

15

46 [1.81]

46 [1.81]

213.3 [8.40]

232.6 [9.16]

Option R

20.638 [0.813]

13-

46 [1.81]-

230.89 [9.09]

BC152886484146en-000109 | 69

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Schematics

Pump Schematics
LOOP
FLUSHING
REMOTE PRESSURE
FILTRATION(PARTIAL FLOW)E M3 D

FROM FILTERREMOTE PRESSURE
FILTRATION(FULL FLOW)E M3 DTO FILTER

SUCTIONFILTRATION

NFPE

NFPH

E M3 D

FNR

N L2
A
M1

A
b
B

M5M4

REMOTE PRESSURENO ADAPTERS

L1

SUCTIONNO ADAPTER

E M3 D
MDC WITH NSS AND
SOLENOID OVERRIDE

M2
B

a

X1
X2

E M3 D
M3

MDC

N

L2
A
M1

SYSTEMCHECK
RELIEFVALVES

X7

M5 M4
HC-EDC
X1

EDC
X1

S

M2
B

L1
RELIEF WITH
BYPASSNO RELIEF

X2

70 | © Danfoss | February 2021

X2

P100436E

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Model CodeModel Code: A, B, Y, C(

= Standard,= Optional)

A - Product Series
Code

Description

A

Series 42

B - Rotation
Code

Description

L

Pump, left hand rotation (CCW)R

Pump, right hand rotation (CW)

28

32

41

51

28

Y - DisplacementCode

cm3/rev [in3/rev]

32

41

51

28

28 cm3/rev (1.71 CU. IN.) without speed sensing

-

-

-

2A

28 cm3/rev (1.71 CU. IN.) with speed sensing

-

-

-

32

31.8 cm3/rev (1.94 CU. IN.) without speed sensing

-

-

-

3A

31.8 cm3/rev (1.94 CU. IN.) with speed sensing

-

-

-

41

41 cm3/rev (2.50 CU. IN.) without speed sensing

-

-

4A

41 cm3/rev (2.50 CU. IN.) with speed sensing

-

-

51

51 cm3/rev (3.11 CU. IN.) without speed sensing

-

-

-

5A

51 cm3/rev (3.11 CU. IN.) with speed sensing

-

-

-

28

32

41

-

-

-

C - Input Shaft Configuration© Danfoss | February 2021

Code

DescriptionC

13 teeth 16/32 pitchg

D

15 teeth 16/32 pitchE

19 teeth 16/32 pitchG

1.0 inch round straight keyed

51

BC152886484146en-000109 | 71

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Model CodeModel Code: D

D - Control Type
Control

Description

No Control (Cover Plate):
N = None (MDC/EDC)
M = None (NFPE/FNR)

D = Shipping Cover)

N = N/A

N = N/A

Manual Displacement:
A = MDC, Standard
L = MDC, NAR Deadband

Neutral Start Switch:
N = NoneOverride to Neutral::
N = NoneOverride to Neutral with
Brake Release:
Internal SOL
A = 12V, Weather
B = 12V, DIN
C = 24V, Weather
D = 24V, DIN
J = 12V, Deutsch
K = 24V, Deutsch

Other Features:
3 = Std handle with low
gain spool
S = Clevis handle with highgain
A = Clevis handle with low
gain spool
B = Std handle with highgain (Standard)

Style:
1 = PCP style

Input:
A = 14-85 MA

Connector/spool:
3 = Weather, low gain spool
4 = MS, low gain spool
5 = Weather, high gainspool
6 = MS, high gain spool
7 = Deutsch, high gainspool

2 = Dual solenoid Highcurrent displacement
control

C = 12V, 300-750mA
D = 24V, 150-375mA

7 = Deutsch with lead wire
(special), high gain
8 = Deutsch, high gain

Style:
2 = Bolt-on, 12 V, DIN(41/51cc only)
4 = Bolt-on, 24 V, DIN(41/51cc only)
5 = Bolt-on, 12 V, Amp Jr(41/51cc only)
6 = Integral, 12 V DIN(28/32cc only)
7 = Integral, 24V DIN(28/32cc only)
8 = Integral, 12 V, Amp Jr(28/32cc only)

N = None

N = None

NSS (only):
1 = Weather
2 = Term
NSS +BAS with CW handle
rotation:
3 = Weather
4 = Leads
7 = Deutsch
NSS +BAS with CW handle
rotation:
5 = Weather
6 = Leads
8 = Deutsch

Electrical Displacement:
E = EDC, HC-EDC

3-Position FNR:
F = FNR

Non-feedback proportional Style:
G = NFP
1 = Electric - 12 V (Bolt-On)(41/51cc only)
2 = Electric - 12 V (Integral)(28/32cc only)
3 = Hydraulic style72 | © Danfoss | February 2021

Input:
Connector:
A = 650-1000 MA, 5-20 BAR 1 = Amp Jr Power Timer
2 = Packard Weather- Pack
(28/32cc only)A = 5-20 BAR

N = N/A

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Model CodeModel Code: E

E - Control Response Time
Control© Danfoss | February 2021

Description

28

32

MDC, EDC:

Servo A, drain A, drain B, servo B (Gasket Orifice)00

Gasket without orifice01

FAST, (1.6, 1.6, 1.6, 1.6)

02

Medium (1.0, 4.0, 4.0, 1.0 mm)

03

Slow (Standard) (0.8, 4.0, 4.0, 0.8 mm)

NFPH, Integral NFPE,(28/32/41/51 cc) & Integral FNR
Options(28/32cc only):

Servos A and B (Plug Orifice)50

No Orifice (Standard)

52

Medium 1.0 mm

53

Slow 0.8 mm

Bolt-on FNR & Bolt-on NFPE
Options:

Servos A and B (Plug Orifice)70

No Orifice72

Medium 1.0 mm

-

-

73

Slow 0.8 mm

-

-

-

41

51

-

BC152886484146en-000109 | 73

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Model CodeModel Code: F, Q, R

F, Q, R - Port/housing style, Loop Flushing, Filtration
Frame
size

F: Port Style/Housing

28/32

MDC, EDC (All feedback controls)

28/32

28/32

74 | © Danfoss | February 2021

Q: Loop Flushing/Cooling

R: Filtration

A = SAE Threaded O-ring Boss
(No loop flushing, no filter pad,base housing)N = None

N = None (External charge
supply, No Adapter)
A = Suction, No Adapter

B = SAE Threaded O-ring Boss
(Required for speed ring or
sensor full featured housing)

D = Defeated loop flushing
2 = Loop flush/cool
3 = Loop flush/cool
4 = Loop flush/cool
5 = Loop flush/cool
Please refer to Loop flushing flow.

B = Remote Pressure (Full flow)
with adapter

C = SAE Threaded O-ring Boss
(Loop flushing, no filter pad-basehousing)

D = Defeated loop flushing
2 = Loop flush/cool
3 = Loop flush/cool
4 = Loop flush/cool
5 = Loop flush/cool
Please refer to Loop flushing flow.

N = None (External charge
supply, No Adapter)
A = Suction, No Adapter

D = SAE Threaded O-ring boss
(No loop flushing, integral full
flow filtration)

N = None

F = Remote pressure (Full Flow),
without adapter

NFPE & FNR (Integral non-feedback proportional electric and 3 position controls)
U = SAE Threaded O-ring boss
(Required for speed ring andsensor-full featured housing)

D = Defeated loop flushing
2 = Loop flush/cool
3 = Loop flush/cool
4 = Loop flush/cool
5 = Loop flush/cool
Please refer to Loop flushing flow.

X = None (external charge
supply, with adapter)
G = Suction, with adapter
B = Remote pressure (Full flow),with adapter

V = SAE Threaded O-ring boss
(No Loop Flushing, Integral Full
Flow Filtration, Not for use withspeed sensor)

N = None

F = Remote Pressure (Full flow)
with adapter

NFPH (Non-feedback proportional hydraulic)
T = SAE Threaded O-ring Boss (No N=Noneloop flushing, no filter pad-basehousing)

D = Suction,No Adapter, Nogauge port plug
M = None (External charge
special, no gauge port plug)

P = SAE Threaded O-ring Boss
(Required for speed ring or
sensor-full featured housing)

X = None (external charge supply,with adapter)
G = Suction, with adapter
B = Remote pressure (Full flow),with adapter

D = Defeated loop flushing
2 = Loop flush/cool
3 = Loop flush/cool
4 = Loop flush/cool
5 = Loop flush/cool
Please refer to Loop flushing flow.

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Model Code41/51

MDC (All feedback controls)
A = SAE threaded O-ring boss (No N=Noneloop flushing, no filter pad
housing)

N = None (External charge
supply, no adapter)
A = Suction, no adapter

B = SAE threaded O-ring boss
(Required for speed ring or
sensor-full featured housing)

D = Defeated loop flushing
2 = Loop flush/cool
3 = Loop flush/cool
4 = Loop flush/cool
5 = Loop flush/cool
Please refer to Loop flushing flow.

B = Remote pressure (Full flow),with adapter

C = SAE threaded O-ring boss
(Loop flushing, no filter padbase
housing)

D = Defeated loop flushing
2 = Loop flush/cool
3 = Loop flush/cool
4 = Loop flush/cool
5 = Loop flush/cool
Please refer to Loop flushing flow.

N = None (External charge
supply, no adapter)
A = Suction, no adapter

D = SAE threaded O-ring boss (No N = Noneloop flushing, integral full flow
filtration)
41/51

NFPE, FNR (Electric non-feedback controls)
J = SAE Threaded O-ring boss
(Required for speed ring andsensor full featured housing)

41/51

D = Defeated loop flushing
2 = Loop flush/cool
3 = Loop flush/cool
4 = Loop flush/cool
5 = Loop flush/cool
Please refer to Loop flushing flow.

X = None (external charge
supply, with adapter)
G = Suction, with adapter
B = Remote pressure (Full flow),with adapter
C = Remote pressure (Partialflow), with adapter

D = Defeated loop flushing
2 = Loop flush/cool
3 = Loop flush/cool
4 = Loop flush/cool
5 = Loop flush/cool
Please refer to Loop flushing flow.

X = None (external charge supply,with adapter)
G = Suction, with adapter
B = Remote pressure (Full flow),with adapter
C = Remote pressure (Partialflow), with adapter

NFPH (Integral Control)
P = SAE Threaded O-ring boss
(Required for speed ring or
sensor-full featured housing)© Danfoss | February 2021

F = Remote pressure (Full flow),
without adapter

BC152886484146en-000109 | 75

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Model CodeModel Code: G, S, T, U

G, S, T, U - Port/housing style, Loop Flushing, Filtration
Frame
size

G: Charge/Implement
Pump

28/32 and A = None (with no41/51
coupling, auxiliary pad
options Y & Z)
N = None (w/spacer - notavailable for rear auxiliary
mounting pad option N)
2 = 11cc
3 = 15.6cc

76 | © Danfoss | February 2021

S: Charge Relief
Setting

T: Special Drive
Features

U: Rear Auxiliary
Mounting Pad

A = 10 bar (145 psi)
B = 12 bar (174 psi)
C = 14 bar (203 psi)
D = 16 bar (232 psi)
E = 18bar (261psi)
F = 20 bar (290 psi)
G = 22 bar (319 psi)
H = 24 bar (348 psi)
P = Defeated

N = None
1 = NFP with anti-stall
5 = NFP with standard
CRPV

N = None, with charge
pump (Not for use with
Charge pump option =N)
A = SAE-A, 9 tooth
B = SAE-B, 13 tooth
T = SAE-A special, 11
tooth
R = SAE A, 13 tooth(41/51cc only)
V = SAE B-B, 15 tooth
Z = None (With external
charge, charge pump
option A)

BC152886484146en-000109

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Model CodeModel Code: H, J(

= Standard,= Optional)

H - System Pressure Protection-Port A

(

Code

Description

NN

None (Check valve only)

14

140 bar (2030 psi) HPRV

17

175 bar (2540 psi) HPRV

19

190 bar (2755 psi) HPRV

21

210 bar (3045 psi) HPRV

23

230 bar (3330 psi) HPRV

25

250 bar (3335 psi) HPRV

28

280 bar (4060 psi) HPRV

30300 bar (4350 psi) HPRV

32

325 bar (4715 psi) HPRV

34345 bar (5000 psi) HPRV

36360 bar (5220 psi) HPRV

-

-

38

385 bar (5580 psi) HPRV

-

-

41

415 bar (6020 psi) HPRV--

= Standard,

28

32

41

51

= Optional)

J - System Pressure Protection-Port B© Danfoss | February 2021

Code

Description

28

32

41

51

NN

None (Check valve only)

14

140 bar (2030 psi) HPRV

17

175 bar (2540 psi) HPRV

19

190 bar (2755 psi) HPRV

21

210 bar (3045 psi) HPRV

23

230 bar (3330 psi) HPRV

25

250 bar (3335 psi) HPRV

28

280 bar (4060 psi) HPRV

30300 bar (4350 psi) HPRV

32

325 bar (4715 psi) HPRV

34345 bar (5000 psi) HPRV

36360 bar (5220 psi) HPRV

-

-

38

385 bar (5580 psi) HPRV

-

-

41

415 bar (6020 psi) HPRV--BC152886484146en-000109 | 77

Technical Information
Series 42 Closed Circuit Axial Piston Pumps
Model CodeModel Code: K, L, M, N, P(

= Standard,= Optional)

K - Loop Bypass Valve
Code

Description

N

None

B

Bypass Valve

28

32

41

51

28

32

41

51

28

32

41

51

28

32

41

51

28

32

41

51

L - Displacement limiters - Side 1
CodeDescription

N

None

A

Adjustable limiter set at max. displacement

0

None

1

Adjustable limiter set at max displacement

Displacement limiters - NFP, Side 1

M - Displacement limiters - Side 2
CodeDescription

N

None

A

Adjustable limiter set at max. displacement

0

None

1

Adjustable limiter set at max displacement

Displacement limiters - NFP, Side 2

N - Special Hardware
Code

Description

NNN

None

AAA

Speed sensor with weather packard connector

P - Special Features78 | © Danfoss | February 2021

Code

Description

NNN

None

BC152886484146en-000109

Products we offer:

•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•

Cartridge valves
DCV directional control
valvesElectric converters
Electric machines

Danfoss Power Solutions is a global manufacturer and supplier of high-quality hydraulic andelectric components. We specialize in providing state-of-the-art technology and solutions
that excel in the harsh operating conditions of the mobile off-highway market as well as themarine sector. Building on our extensive applications expertise, we work closely with you toensure exceptional performance for a broad range of applications. We help you and othercustomers around the world speed up system development, reduce costs and bring vehicles
and vessels to market faster.

Gear motors

Danfoss Power Solutions – your strongest partner in mobile hydraulics and mobile
electrification.

Gear pumps

Go to www.danfoss.com for further product information.

Hydraulic integrated
circuits (HICs)
Hydrostatic motors

We offer you expert worldwide support for ensuring the best possible solutions foroutstanding performance. And with an extensive network of Global Service Partners, we also
provide you with comprehensive global service for all of our components.

Electric motors

Hydrostatic pumps
Orbital motors
PLUS+1® controllers
PLUS+1® displays
PLUS+1® joysticks andpedals
PLUS+1® operator
interfaces
PLUS+1® sensors
PLUS+1® software
PLUS+1® software services,support and training
Position controls andsensors
PVG proportional valves
Steering components andsystems
Telematics

Local address:

Hydro-Gear
www.hydro-gear.com
Daikin-Sauer-Danfoss
www.daikin-sauer-danfoss.com

Danfoss
Power Solutions (US) Company
2800 East 13th Street
Ames, IA 50010, USA
Phone: +1 515 239 6000

Danfoss
Power Solutions GmbH & Co. OHG
Krokamp 35
D-24539 Neumünster, Germany
Phone: +49 4321 871 0

Danfoss
Power Solutions ApS
Nordborgvej 81
DK-6430 Nordborg, Denmark
Phone: +45 7488 2222

Danfoss
Power Solutions Trading(Shanghai) Co., Ltd.
Building #22, No. 1000 Jin Hai Rd
Jin Qiao, Pudong New District
Shanghai, China 201206
Phone: +86 21 2080 6201

Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products
already on order provided that such alterations can be made without subsequent changes being necessary in specifications already agreed.
All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.

© Danfoss | February 2021

BC152886484146en-000109