Technical Information

DDC Axial Piston Pumps
Size 20/24

www.danfoss.com

Technical Information
DDC Axial Piston Pumps Size 20/24

Revision history

2 | © Danfoss | May 2024

Table of revisions
Date

ChangedRev

May 2024

Corrected LFV

0402

March 2024

Updated drawings for change in painting coverage

0401

February 2023

Updated "E- Control Arm Location and Configuration" at Model Code0310

February 2022

Added Option: Detent0309

December 2021

Minor fix on Design Specifications

0308

November 2021

Added notes at Diagrams and LFV

0307

October 2021

Added table on CPRV

0306

September 2021

Added to CPRV and Model Code: L

0305

March 2021

Minor update in Input Shafts AB, BB, DB

0304

January 2021

Minor update in Performance Specifications

0303

Nov 2011 - Nov 2020

Various update

AB - 0302

October 2011

First editionAA

BC152886484876en-000402

Technical Information
DDC Axial Piston Pumps Size 20/24
Contents
General Description
Design...................................................................................................................................................................................................5
Key Features....................................................................................................................................................................................... 5
Typical Applications........................................................................................................................................................................ 5
System Diagram................................................................................................................................................................................6
Schematic Diagram..........................................................................................................................................................................7
Technical Specifications
Design Specifications......................................................................................................................................................................8
Performance Specifications.......................................................................................................................................................... 8
Operating Parameters.....................................................................................................................................................................9
Fluid Specifications..........................................................................................................................................................................9
Operation
High Pressure Relief / Check Valve (HPRV)............................................................................................................................10
High pressure relief / check valve with orifice............................................................................................................... 10
Bypass Function..............................................................................................................................................................................11
Charge Pressure Relief Valve (CPRV)....................................................................................................................................... 12
Loop Flushing Valve......................................................................................................................................................................13
Control............................................................................................................................................................................................... 14
Direct Displacement Control................................................................................................................................................14
Control Handle Requirements............................................................................................................................................. 14
Operating Parameters
Overview........................................................................................................................................................................................... 15
Input speed...................................................................................................................................................................................... 15
System Pressure..............................................................................................................................................................................15
Charge pressure..............................................................................................................................................................................15
Charge pump inlet pressure...................................................................................................................................................... 16
Case pressure...................................................................................................................................................................................16
Temperature.................................................................................................................................................................................... 16
Viscosity.............................................................................................................................................................................................16
System Design Parameters
Filtration system ............................................................................................................................................................................ 17
Filtration............................................................................................................................................................................................ 18
Suction filtration....................................................................................................................................................................... 18
Charge pressure filtration......................................................................................................................................................18
External Pressure Filtration................................................................................................................................................... 19
Independent braking system.................................................................................................................................................... 19
Fluid Selection.................................................................................................................................................................................19
Reservoir............................................................................................................................................................................................19
Case Drain.........................................................................................................................................................................................19
Charge Pump...................................................................................................................................................................................20
Charge Pump Sizing/Selection............................................................................................................................................ 20
Charge Pump Output Flow........................................................................................................................................................ 20
Implement Pump........................................................................................................................................................................... 21
Bearing Loads and Life.................................................................................................................................................................23
Applications with External Shaft Loads............................................................................................................................ 23
Input Shaft...................................................................................................................................................................................23
Shaft Torque.....................................................................................................................................................................................24
Mounting Flange Loads...............................................................................................................................................................25
Estimating Overhung Load Moments...............................................................................................................................25
Understanding and minimizing system noise.....................................................................................................................26
Size Equations................................................................................................................................................................................. 27
Model CodeModel Code: A, B, R, C, E, G, M................................................................................................................................................... 28
Model Code: H, K, F........................................................................................................................................................................29
Model Code: J, S, L......................................................................................................................................................................... 30
Model Code: N, P, Y, Z...................................................................................................................................................................31© Danfoss | May 2024

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Technical Information
DDC Axial Piston Pumps Size 20/24
Contents
Installation Drawings
With Aux-Pad, No Charge Pump, Left Trunnion, SAE A Flange Configuration........................................................32
With Aux-Pad, No Charge Pump, Left Trunnion, SAE B Flange Configuration........................................................ 34
With Charge Pump, No Aux-Pad, Left Trunnion, SAE A Flange Configuration........................................................36
With Charge Pump, No Aux-Pad, Left Trunnion, SAE B Flange Configuration........................................................ 38
With Implement Pump, No Aux-Pad, Left Trunnion, SAE A Flange Configuration................................................ 40
With Implement Pump, No Aux-Pad, Left Trunnion, SAE B Flange Configuration................................................ 42
Option: Detent................................................................................................................................................................................ 44
Input Shafts: AA, BA, DA.............................................................................................................................................................. 45
Input Shafts: AB, BB, DB............................................................................................................................................................... 46
Input Shafts: AC, BC, DC...............................................................................................................................................................47
Auxiliary Mounting Pads............................................................................................................................................................. 48
Reference Literature
Literature...........................................................................................................................................................................................50

4 | © Danfoss | May 2024

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Technical Information
DDC Axial Piston Pumps Size 20/24
General Description
Design
The DDC pump is a compact and lightweight variable displacement axial piston pump intended for use
in closed circuit low to medium power applications. DDC pump is a direct displacement control pumputilizing an advanced slipper piston design. The flow rate is infinitely variable between zero andmaximum. The direction of flow is commanded by tilting the swashplate in one direction or the otherfrom the neutral (zero flow) position. Reversing the direction of flow reverses the direction of motor
rotation.
Key Features

•
•
•
•
•
•
•

Displacement 20/24 cm3/rev [1.22/1.46 in3/rev]
Optional bypass valve and loop flushing valve
Optional integral charge pump / Implement pumpCompact design with best in class pressure ratings and durability
Low noise
Backed by a global network of Danfoss service provider
Mounting flange (SAE-A / B)

Typical Applications

•

•
•
•
•

Turf Care‒ Greens Mower‒ Zero Turn Radius Mower‒ LoadersUtility Vehicles
Compact Agricultural Machinery
Small Compactors
Compact Construction Equipment

DDC Pump Cross-Sectional View
Trunnion
Valve plate

PistonSlipper
Charge pressure relief valve

Ball bearing

Input
shaft

Charge pump
Swashplate
Check and high pressure relief valve© Danfoss | May 2024

EndcapNeedle bearing
Bypass valve

P400023

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Technical Information
DDC Axial Piston Pumps Size 20/24
General Description
System Diagram

Heat exchanger
bypassReservoir

FilterHeat
exchanger
Charge pressure relief
valve

Cylinderblockassembly

OMR
orbitalmotor
Charge pump
Bypassvalve
Outputshaft

Suction flow
Input
shaft

Variable
displacement
pump

High pressure relief/
check valves

Working Loop (Low Pressure) andCharge Pressure

Loop flushing valve

Working Loop (High Pressure)
Case flow

P400024

Loop flushing valve and Charge pump cannot be used together in one pump.

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DDC Axial Piston Pumps Size 20/24
General Description
Schematic Diagram
L3

M3

MA

A

B

L1

L2

S

MB

P400025

Loop flushing valve and Charge pump cannot be used together in one pump.

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DDC Axial Piston Pumps Size 20/24
Technical Specifications
Design Specifications
Features

DDC pump

DesignAxial piston pump of journal trunnion design with variable displacement

Direction of input rotation

Clockwise or counterclockwise

Recommended installation position

Pump installation position is discretionary, however the recommended trunnion positionis on the side or at the bottom.
If mounted with trunnion shaft position upward, water and dust tend to collect aroundthe shaft, which may accelerate the deterioration of the shaft seal.
Vertical input shaft installation is acceptable. The housing must always be filled withhydraulic fluid. Recommended mounting for a multiple pump stack is to arrange thehighest power flow towards the input source.
Consult Danfoss for nonconformance to these guidelines.

Filtration configuration

Suction or charge pressure filtration

Other system requirements

Independent braking system, suitable reservoir and heat exchanger

Control type

Direct displacement control

Performance Specifications
Features

Units

DDC20

DDC24

Displacement1

cm3/rev [in3/rev]

0-20.0 [0-1.22]

0-24.0 [0-1.46]

Mass moment of inertia of rotating componentskg•m2 [slug•ft2]

0.0009 [0.0006]

With charge pumpWeight dry

With implement pump

10 [22.1]
kg [lb]11 [24.3]

liter [US gal]

0.7 [0.1]

With auxiliary pad
Oil volume

Case only

12 [26.4]

Mounting flange

ISO3019-1 flange 101-2 (SAE B), 2 bolt
ISO3019-1 flange 82-2 (SAE A), 2 bolt

Input shaft outer diameter, Splines, key shafts2

ISO 3019-1, outer dia 22mm-4 (SAE B, 13 teeth)
ISO 3019-1, outer dia 22mm-1 (Straight Key, Ls)
ISO 3019-1, outer dia 22mm-1 (Straight Key, Special length)

Auxiliary mounting flange with metric fasteners, shaft outer
diameter and splines

ISO 3019-1, flange 82 - 2, outer dia 16 mm - 4(SAE A, 9 teeth)
ISO 3019-1, flange 82 - 2, outer dia 19 mm - 4(SAE A, 11 teeth)

Suction ports

ISO 11926-1, 7/8 -14 (SAE O-ring boss)

Main port configuration

ISO 11926-1, 7/8 -14 (SAE O-ring boss) Twin port, radial

Case drain ports L1, L2 , L3

ISO 11926-1, 3/4 -16 (SAE O-ring boss)

Other ports

See Installation Drawings on page 32

Customer interface threads

Metric fasteners

1 Max Swashplate angle is 18 degrees.
2 See Installation Drawings on page 32 for mounting flange SAE A.

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Technical Information
DDC Axial Piston Pumps Size 20/24
Technical Specifications
Operating Parameters
For definitions of the following specifications, see Operating Parameters on page 15
Features

Units
Minimum for internal charge
supply1

Input speed

Minimum for external
charge supply

500
min-1 (rpm)

Rated

System pressure

Maximum

4500

Maximum working pressure

300 [4350]

Maximum pressure

Charge pressure (minimum)

bar [psi]

bar@15 lpm [psi/USG]

Minimum (cold start)

345 [5004]
4 [58]

Minimum (continuous)

Case pressure

500
4000

Minimum low loop (above
case)

Charge pump inlet pressure

DDC pump

7 [101]
0.8 [6]bar (absolute) [in Hg vacuum]

0.2 [24]

Maximum

2.0

Rated

1.5 [21.7]

Maximumbar [psi]

3 [43.5]

1 No load condition. Refer to System Design Parameters/Charge Pump on page 20 for details.

Fluid Specifications
FeaturesUnitsintermittent1

Viscosity

Temperature range3

Filtration (recommended
minimum)

Minimum
Recommended range

DDC pump
5 [42]

mm2/sec. [ SUS]

7 [49]
12 - 80 [66 - 370]

Maximum (cold start)2

1600 [7500]

Maximum (cold start)-20

Recommended range
Maximum continuous°C

60 - 85
104

Maximum intermittent

115

Cleanliness per ISO 4406

22/18/13

Efficiency (charge pressure
filtration)

β-ratio

Efficiency (suction filtration)
Rercommended inlet screenmesh size

β15-20=75(β10≥10)β35-45=75(β10≥2)µm

100 - 125

1 Intermittent=Short term t <1 min per incident and not exceeding 2 % of duty cycle based load-life.
2 Cold start = Short term t < 3 min, p < 50 bar [725 psi], n < 1000 min-1 (rpm)3 At the hottest point, normally case drain port.

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Technical Information
DDC Axial Piston Pumps Size 20/24
Operation

High Pressure Relief / Check Valve (HPRV)The DDC pump is equipped with a combination high pressure relief and charge check valve. The highpressure relief valve (HPRV) function is a dissipative (with heat generation) direct acting pressure control
valve for the purpose of limiting excessive system pressures. Each side of the transmission loop has a
non-adjustable HPRV valve. When system pressure exceeds the factory setting of the valve, oil flows into
the charge gallery. The valve is a differential pressure device working with system and charge pressure.
The charge check function acts to replenish the low-side working loop with oil any time the low looppressure falls below charge pressure.
Different pressure relief settings may be used at each system port. The order code specifies HPRV
pressure setting availability.
High pressure relief / check valve with orifice
A HPRV valve with an orifice is available as an option. In some applications, it is desirable to use a HPRV/Check with an orifice to allow for easier neutral adjustment. The orifice connects the working loop to thecharge gallery. It allows a small amount of loop leakage which expands the dead band around the neutral
position of the swashplate. Most applications find it suitable to configure only one side of the systemloop with an orificed HPRV. An orifice referenced to the high pressure side of the loop will decrease
effective efficiency of the system and increase heat into the system. By locating an orifice only on thereverse drive side of the loop, system efficiency losses are minimized. Increased downhill creep may also
be present.
The HPRV are set at the following flow rates
Check/HPRV without orifice

5 l/min [1.3 US gal/min]

Check/HPRV with orifice

17 l/min [4.5 US gal/min]

P400026

C Caution
HPRV´s are factory set at a low flow condition. Any application or operating condition which leads toelevated HPRV flow will cause a pressure rise above the factory setting. Contact your Danfoss
representative for an application review. Using an HPRV with an orifice may increase downhill creep.

W Warning
Unintended vehicle or machine movement hazard.
The vehicle must include a braking system redundant to the hydrostatic transmission, sufficient to stopand hold the vehicle or machine in the event of hydrostatic drive power loss.

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DDC Axial Piston Pumps Size 20/24
Operation
Bypass Function
In some applications it is desirable to bypass the hydraulic fluid around the pump so the machine/load
can be moved without rotating the pump shaft or prime mover. An optional bypass valve mechanicallyconnects both A & B sides of the system pressure together. The bypass is fully opened when the valve isturned (opened) counterclockwise 3 revolutions. The valve must be fully closed for normal operation.
Refer to the DDC pump outline drawings for location of the bypass valve.

Bypass Valve

System Loop (High Pressure)

System Loop (Low Pressure)
P400027

Bypass valve wrench size and torque
Wrench size

Torque N•m [lbf•ft]

17 mm external12.0 [9.0]

C Caution
Excessive speed or extended movement will damage the pump and motor(s)Avoid excessive speeds and extended load/vehicle movement when using the bypass function. Damage
to the drive motor is possible if the load or vehicle is moved at a speed greater than 20% of maximum orfor a duration exceeding 3 minutes..

© Danfoss | May 2024

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DDC Axial Piston Pumps Size 20/24
Operation
Charge Pressure Relief Valve (CPRV)
An internal charge pressure relief valve (CPRV) regulates charge pressure within the hydraulic circuit. The
CPRV is a direct acting poppet valve that regulates charge pressure at a designated level above casepressure.
The charge pressure relief valve setting is specified within the model code of the pump. DDC pumps withcharge pump have the CPRV set at 1800 rpm while DDC pumps without charge pump have the CPRV set
with below external charge supply.
Charge pressure setting in MMC [bar]External charge flow [L/min]

7

8.6

11, 14, 18, 21

13.5

The 7 bar charge pressure rise rate, with flow, is approximately 0.8 bar/10 liter [4.4 psi/US gal].
The 11 and 14 bar charge pressure rise rate, with flow, is approximately 1.4 bar /10 liter [7.7 psi/US gal].
The 18 and 21 bar charge pressure rise rate, with flow, is approximately 1.6 bar/10 liter [8.8 psi/US gal] .

Case Drain

Charge Pressure

P400028

C Caution
When a DDC pump is used with a variable motor, ensure the available charge pressure matches therequired motor shift pressure. Contact your Danfoss representative for the availability of additionalcharge relief settings.

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DDC Axial Piston Pumps Size 20/24
Operation
Loop Flushing Valve
DDC pumps are available with an optional integral loop flushing. A loop flushing valve will remove heatand contaminants from the main loop at a rate faster than otherwise possible.
The DDC loop flushing design is a simple spring centered shuttle spool with an orifice plug. The
shuttleshifts at approximately 8 bar [115 psi].
The flushing flow is a function of the low loop system pressure (charge) and the size of the plug.
Notched Diameter

Working Loop (Low Pressure)

Case

Working Loop (High Pressure)
P400029

Loop flushing valve is not available with charge pump combination.
Loop flushing performance

Flow [lpm]

Oil Temp = 50°C (~30 mm2/S)

Charge pressure [d bar]

P400301

When a DDC pump is used with an external loop flushing shuttle valve, ensure that the charge setting of
the pump matches the setting of the loop flushing shuttle valve. Contact your Danfoss representative forthe availability of additional charge relief settings.

© Danfoss | May 2024

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DDC Axial Piston Pumps Size 20/24
Operation
Control
Direct Displacement Control
The DDC pump features direct displacement control (DDC) .The swashplate angle is set directly by alinkage attached to the swashplate trunnion. Moving the control lever changes the displacement anddirection of flow.
The input shaft is configurable to the left or right side of the pump.
Control Handle Requirements
All DDC pumps will transfer hydraulic forces from within the transmission into the pump control arm
where these forces are seen as a control arm torque. The nature and magnitude of the control arm torqueis a function of transmission operating conditions (pump speed, pressure and displacement) and designof the DDC valve plate. During normal operation the control arm torque will be stroke reducing, whereas
dynamic braking and downhill operation likely will result in stroke increasing control arm feedback. The
driver and/or the mechanical linkage must be able to return the pump to neutral under all conditions.
Contact Danfoss for additional application support regarding lower control arm torque options.
Maximum allowable control arm torque, applied from the customer linkage, is 79.1 Nm (700 in-lbs).
Linkage stops may be required to limit input torque to the control arm. Maximum swashplate angle is +/18 degrees.
DDC Pumps Control Moment
Input=2000 rpm, Temp=50°C, Shell Tellus 46 Viscosity=30m 2/s
Stroking Speed=1deg/sec, Standard HPRV
<pumping mode><a>Stroke decreasing moment

50

<b>

Stroke increasing moment

40

a

b

6 bar
35 barTrunnion moment (N•m)

30

50 bar
100 bar20

200 bar
300 bar

10
0
-20

-15

-10

-5

0

5

10

15

20

-10
-20
-30
-40

Stroke increasing moment-50

Angle (deg)14 | © Danfoss | May 2024

Stroke decreasing moment
P400030

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DDC Axial Piston Pumps Size 20/24
Operating Parameters
Overview
This section defines the operating parameters and limitations with regard to input speeds and pressures.
Input speed
Minimum speed is the lowest input speed recommended during engine idle condition. Operating below
minimum speed limits pump’s ability to maintain adequate flow for lubrication and power transmission.
Rated speed is the highest input speed recommended at full power condition. Operating at or below
this speed should yield satisfactory product life.
Maximum speed is the highest operating speed permitted. Exceeding maximum speed reduces productlife and can cause loss of hydrostatic power and braking capacity. Never exceed the maximum speed
limit under any operating conditions.
Operating conditions between Rated speed and Maximum speed should be restricted to less than fullpower and to limited periods of time. For most drive systems, maximum unit speed occurs during
downhill braking or negative power conditions.
During hydraulic braking and downhill conditions, the prime mover must be capable of providing
sufficient braking torque in order to avoid pump over speed. This is especially important to consider forturbocharged and Tier 4 engines.

W Warning
Unintended vehicle or machine movement hazard.
Exceeding maximum speed may cause a loss of hydrostatic drive line power and braking capacity. You
must provide a braking system, redundant to the hydrostatic transmission, sufficient to stop and hold thevehicle or machine in the event of hydrostatic drive power loss.
System Pressure
System pressure is the differential pressure between system ports A and B. It is the dominant operating
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 setting normally defined within the order code of thepump. This is the applied system pressure at which the driveline generates the maximum calculated pullor 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 proper component 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. Pressure spikes are normal and must be considered when reviewing maximum working
pressure.
All pressure limits are differential pressures referenced to low loop (charge) pressure. Subtract low looppressure from gauge readings to compute the differential.
Minimum low loop pressure (above case pressure) is the lowest pressure allowed to maintain a safe
working condition in the low side of the loop.
Charge pressure
An internal charge relief valve regulates charge pressure. Charge pressure maintains a minimum pressurein the low side of the transmission loop.
The charge pressure setting listed in the order code is the set pressure of the charge relief valve with thepump in neutral, operating at 1800 min-1 [rpm], and with a fluid viscosity of 32 mm2/s [150 SUS]. Pumps© Danfoss | May 2024

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DDC Axial Piston Pumps Size 20/24
Operating Parameters
configured with no charge pump (external charge supply) are set with a charge flow of 18.9 l/min [5.0 US
gal/min] and a fluid viscosity of 32 mm2/s [150 SUS].
The charge pressure setting is referenced to case pressure.
Charge pump inlet pressure
At normal operating temperature charge inlet pressure must not fall below rated charge inlet pressure(vacuum).
Minimum charge inlet pressure is only allowed at cold start conditions. In some applications it isrecommended to warm up the fluid (e.g. in the tank) before starting the engine and then run the engine
at limited speed until the fluid warms up.
Maximum charge pump inlet pressure may be applied continuously.
Case pressure
Under normal operating conditions, the rated case pressure must not be exceeded. During cold start casepressure must be kept below maximum intermittent case pressure. Size drain plumbing accordingly.

C Caution
Possible component damage or leakage
Operation with case pressure in excess of stated limits may damage seals, gaskets, and/or housings,
causing external leakage. Performance may also be affected since charge and system pressure are
additive to case pressure.

Temperature
The high temperature limits apply at the hottest point in the transmission, which is normally the motor
case drain. The system should generally be run at or below the rated temperature.
The maximum intermittent temperature is based on material properties and should never be
exceeded.
Cold oil will not affect the durability of the transmission components, but it may affect the ability of oil toflow and transmit power; therefore temperatures should remain 16 °C [30 °F] above the pour point of thehydraulic fluid.
The minimum temperature relates to the physical properties of component materials. Size heatexchangers to keep the fluid within these limits. Danfoss recommends testing to verify that thesetemperature limits are not exceeded.
Ensure fluid temperature and viscosity limits are concurrently satisfied.
Viscosity
Viscosity For maximum efficiency and bearing life, ensure the fluid viscosity remains in therecommended range.
The minimum viscosity should be encountered only during brief occasions of maximum ambient
temperature and severe duty cycle operation.
The maximum viscosity should be encountered only at cold start.

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DDC Axial Piston Pumps Size 20/24
System Design Parameters
Filtration system
To prevent premature wear, ensure that only clean fluid enters the hydrostatic transmission circuit. A
filter capable of controlling the fluid cleanliness to ISO 4406, class 22/18/13 (SAE J1165) or better, undernormal operating conditions, is recommended.These cleanliness levels cannot be applied for hydraulicfluid residing in the component housing/case or any other cavity after transport.
Filtration strategies include suction or pressure filtration. The selection of a filter depends on a number offactors including the contaminant ingression rate, the generation of contaminants in the system, therequired fluid cleanliness, and the desired maintenance interval. Filters are selected to meet the above
requirements using rating parameters of efficiency and capacity.
Filter efficiency can be measured with a Beta ratio (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 Technical Information,
BC152886482150 for more information.
Cleanliness level and βx-ratio1
Filtration(recommended
minimum)

Cleanliness per ISO 4406
Efficiency (charge pressure
filtration)
Efficiency (suction and return line
filtration)
Recommended inlet screen meshsize

22/18/13
β15-20 = 75 (β10 ≥ 10)
β-ratio
β35-45 = 75 (β10 ≥ 2)µm

100 – 125

1 Filter β -ratio is a measure of filter efficiency defined by ISO 4572. It is defined as the ratio of the number of particles
x

greater than a given diameter (“x” in microns) upstream of the filter to the number of these particles downstream of
the filter.

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DDC Axial Piston Pumps Size 20/24
System Design Parameters
Filtration
Suction filtration
A suction circuit uses an internal charge pump. The filter is placed between the reservoir and the charge
pump inlet. Do not exceed the inlet vacuum limits during cold start conditions.
Suction filtration

P400032

Charge pressure filtration
In a pressure filtration system the pressure filter is remotely mounted in the circuit, downstream of thecharge supply. Pressure filtration is possible with, and without, an internal charge pump. Filters used incharge pressure filtration circuits should be rated to at least 35 bar [508 psi] pressure. Danfoss
recommends locating a 100 – 125 micron screen in the reservoir or in the charge inlet when using chargepressure filtration.
A filter bypass valve is necessary to prevent damage to the hydrostatic system. In the event of highpressure drop associated with a blocked filter or cold start-up conditions, fluid may bypass the filter
temporarily. Avoid working with an open bypass for an extended period. A visual or electrical bypass
indicator is preferred. Proper filter maintenance is mandatory.
Charge pressure filtration

Reservoir

Strainer
Filterwith bypass

To Low Pressure
side of loop

Potential
workfunction
circuit

Chargepump

Charge relief valve
To pump case
P400031

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DDC Axial Piston Pumps Size 20/24
System Design Parameters
External Pressure Filtration
Charge supply is provided to the DDC pump from an auxiliary work function or dedicated gear pump
circuit. After passing thru a remote filter, the flow enters the pump through the external charge supply
port.
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 thehydrostatic transmission, sufficient to stop and hold the vehicle or machine in the event of hydrostatic
drive power loss.

Fluid Selection
Ratings and performance data are based on operating with hydraulic fluids containing oxidation, rustand foam inhibitors. These fluids must possess good thermal and hydrolytic stability to prevent wear,
erosion, and corrosion of pump components.

C Caution
Never mix hydraulic fluids of different types.

Reservoir
The hydrostatic system reservoir should accommodate maximum volume changes during all system
operating modes and promote de-aeration of the fluid as it passes through the tank.
A suggested minimum total reservoir volume is 5/8 of the maximum charge pump flow per minute with aminimum fluid volume equal to 1/2 of the maximum charge pump flow per minute. This allows 30
seconds fluid dwell for removing entrained air at the maximum return flow. This is usually adequate toallow for a closed reservoir (no breather) in most applications.
Locate the reservoir outlet (charge pump inlet) above the bottom of the reservoir to take advantage ofgravity separation and prevent large foreign particles from entering the charge inlet line. A 100-125 µm
screen over the outlet port is recommended.
Position the reservoir inlet (fluid return) to discharge below the normal fluid level, toward the interior of
the tank. A baffle (or baffles) will further promote de-aeration and reduce surging of the fluid.
Case Drain
The pump housing must remain full of oil at all times. The DDC pump is equipped with three case drain
ports to provide flexibility for hose routing and pump installation. Connect a line from one of the casedrain ports to the reservoir. Case drain fluid is typically the hottest fluid in the system.

© Danfoss | May 2024

BC152886484876en-000402 | 19

Technical Information
DDC Axial Piston Pumps Size 20/24
System Design Parameters
Charge Pump
Charge flow is required on DDC pumps. The charge pump provides flow to make up for system leakage,
maintain a positive pressure in the main circuit, and provide flow for cooling and filtration.
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, auxiliary flow requirements, hydrostatic motor type,etc. When initially sizing and selecting hydrostatic units for an application, it is frequently not possible tohave all the information necessary to accurately evaluate all aspects of charge pump size selection.
Unusual application conditions may require a more detailed review of charge pump sizing. Chargepressure must be maintained at a specified level under all operating conditions to prevent damage to thetransmission. Danfoss recommends testing under actual operating conditions to verify this.
Charge Pump Sizing/Selection
In most applications a general guideline is that the charge pump displacement should be at least 10 % of
the total displacement of all components in the system. Unusual application conditions may require amore detailed review of charge flow requirements. Please refer to Selection of Drive line Components,
BC157786484430 for a detailed procedure.
System features and conditions which may invalidate the 10 % guideline include (but are not limited to):Continuous operation at low input speeds {< 1500 min-1 (rpm)}

•
•
•
•

High shock loadingHigh input shaft speeds
LSHT motors with large displacement

Contact your Danfoss representative for application assistance if your application includes any of these
conditions.
Charge Pump Output Flow
Flow at 7 bar [100 psi] charge relief setting, 30mm2/s [140SUS] , 50 °C [122 °F]

Charge pump Flow (lpm)

30
25
20

3

m

c
7.5

15

3

4.8

10

cm

3

m

3.1 c

5
0

0

500

1000

1500 2000 2500 3000
Speed min-1 (rpm)

3500

4000

4500
P400046

20 | © Danfoss | May 2024

BC152886484876en-000402

Technical Information
DDC Axial Piston Pumps Size 20/24
System Design Parameters
Implement Pump
Implement pump is an integrated charge pump that can be used for the lightly-loaded external work
function. Since implement pump has both external gear pump and charge pump functions, it allows
customers to apply more compact sizing than existing system using external gear pump.
The implement circuit must be of the “open center” type that allows oil from the charge pump circulating
through the control valve to return to the transmission.
In the DDC implement circuit, flow from the charge (implement) pump flows first to the implement
circuit control valve, then to the charge relief and charge check valves. The implement circuit must be
designed to return the implement flow to the transmission. The customer must provide an implement
circuit relief valve in addition to the implement control valve. It is also recommended that the customer
provide a charge pressure filter between the implement control valve and the transmission to prevent
any contaminants created in the implement circuit actuator(s) from entering the charge circuit.
Implement Pump Pressure Specifications
Implement Pump Maximum Pressure

85 [1230]

Implement Pump Maximum working pressure (Implement circuit
relief pressure setting)1

bar [psi]

70 [1015]

1 Continuous operation at implement pump relief pressure = Short term t <30sec

Flow at 11mm2/s [63SUS], 80°C [176°F]

Implement pump Flow (lpm)

25
20

7.5 cm 3,

15

5.4 cm 3,
3000 min -1
7.5 cm 3, 1800 m -1
in
5.4 cm 3, 1800 m -1
in

10
5
0

0

10

20

30

40

3000 min -1

50

60

70

Implement Pump Pressure (bar)P400136

Low input speed with high pressure and high temperature may cause the flow shortage.

© Danfoss | May 2024

BC152886484876en-000402 | 21

Technical Information
DDC Axial Piston Pumps Size 20/24
System Design Parameters
Implement Circuit - Schematic Diagram

L3

E

M3

D

MA

A

B
L1

22 | © Danfoss | May 2024

L2

S

MB

P400052

BC152886484876en-000402

Technical Information
DDC Axial Piston Pumps Size 20/24
System Design Parameters
Bearing Loads and Life
Bearing life is a function of speed, system pressure, charge pressure, and swashplate angle, plus any
external side or thrust loads. The influence of swashplate angle includes displacement as well as
direction. External loads are found in applications where the pump is driven with a side/thrust load (beltor gear) as well as in installations with misalignment and improper concentricity between the pump anddrive coupling. All external side loads will act to reduce the normal bearing life of a pump. Other life
factors include oil type, viscosity and cleanliness.
In vehicle propel drives with no external shaft loads and where the system pressure and swashplateangle are changing direction and magnitude regularly, the normal B10 bearing life (90 % survival) will
exceed the hydraulic load-life of the unit.
Bearing B10 Life
Bearing Life
(max. swashplate angle)

At 140 bar system pressure
7 bar charge pressure
1800 rpm

B10 hours

10000

Applications with External Shaft Loads
DDC pump is designed with bearings that can accept some external radial load. When external loads arepresent, the allowable radial shaft loads are a function of the load position relative to the mounting
flange, the load orientation relative to the internal loads, and the operating pressures of the hydraulicunit. In applications where external shaft loads cannot be avoided, the impact on bearing life can be
minimized by proper orientation of the load. Optimum pump orientation is a consideration of the net
loading on the shaft from the external load, the pump rotating group and the charge pump load.
• In applications where the pump is operated such that nearly equal amounts of forward vs. reverse
swashplate operation is experienced; bearing life can be optimized by orientating the external sideload at 90° or 270° such that the external side load acts 90° to the rotating group load (for details see
drawing below).
• In applications where the pump is operated such that the swashplate is predominantly (> 75 %) on
one side of neutral (ie vibratory, conveyor, typical propel); bearing life can be optimized byorientating the external side load generally opposite of the internal rotating group load. The directionof internal loading is a function of rotation and which system port has flow out.
• DDC pump is designed with bearings that can accept some thrust load such that incidental thrustloads are of no consequence. When thrust loads are anticipated, the allowable load will depend on
many factors and it is recommended that an application review be conducted.
Contact Danfoss for a bearing life review if external side loads are present.
Thrust loads should be avoided. If thrust loads are anticipated, contact your Danfossrepresentative.
Input Shaft
The maximum allowable radial load (Re) is based on the maximum external moment (Me) and the
distance (L) from the mounting flange to the load.
Re = Me / L© Danfoss | May 2024

Me

Shaft moment

L

Flange distanceRe

External force to the shaft

Fa

Internal rotating group load (changes with direction of flow)

BC152886484876en-000402 | 23

Technical Information
DDC Axial Piston Pumps Size 20/24
System Design Parameters
Fa

0° Re

L

Re
90° Re270° ReMe

Input shaft

Shaft bearing

180° Re

P400033

Maximum allowable radial load (Re)
1200
1000

Re N

800
600
400
200

0

10

20

30

40

50

distance (L) mm
P400034

Danfoss recommends clamp-type couplings for applications with radial shaft loads
Contact your Danfoss representative for an evaluation of unit bearing life if you have continuously
applied external loads exceeding 25 % of the maximum allowable radial load (Re) or the pumpswashplate is positioned on one side of center all or most of the time.
Shaft TorqueThe rated torque is a measure of tooth wear and is the torque level at which a normal spline life of 2 x
109 shaft revolutions can be expected. The rated torque presumes a regularly maintained minimum levelof lubrication via a moly- disulfide grease in order to reduce the coefficient of friction and to restrict thepresence of oxygen at the spline interface. It is also assumed that the mating spline has a minimum
hardness of Rc 55 and full spline depth.
Maximum torque ratings are based on torsional fatigue strength considering 100.000 full load reversing
cycles. However, a spline running in oil-flooded environment provides superior oxygen restriction in
addition to contaminant flushing. The rated torque of a flooded spline can increase to that of the
maximum published rating. A flooded spline would be indicative of a pump driven by a pump drive or
plugged into an auxiliary pad of a pump.
Maintaining a spline engagement at least equal to the Pitch Diameter will also maximize spline life. Spline
engagements of less than ¾ Pitch Diameter are subject to high contact stress and spline fretting.
Alignment between the mating spline’s pitch diameters is another critical factor in determining theoperating life of a splined drive connection. Plug-in, or rigid spline drive installations can impose severeradial loads on the shaft. The radial load is a function of the transmitted torque and shaft eccentricity.
24 | © Danfoss | May 2024

BC152886484876en-000402

Technical Information
DDC Axial Piston Pumps Size 20/24
System Design Parameters
Increased spline clearance will not totally alleviate this condition; BUT, increased spline clearance will
prevent mechanical interference due to misalignment or radial eccentricity between the pitch diametersof the mating splines. Maximize spline life by adding an intermediate coupling between the bearing
supported splined shafts.
Mounting Flange Loads
Estimating Overhung Load Moments
Adding auxiliary pumps and/or subjecting pumps to high shock loads may result in excessive loading of
the mounting flange. Applications which experience extreme resonant vibrations or shock may require
additional pump support. You can estimate the overhung load moment for multiple pump mounting
using the formula below.
MS = GS (W1L1 + W2L2 + ... +WnLn)
MC = GC (W1L1 + W2L2 + ... +WnLn)
Where:
MC

Rated load moment N•m [lbf•in]MS

Shock load moment N•m [lbf•in]GC

Rated (vibratory) acceleration (G’s)* m/s2 [ft/s2]

GS

Maximum (shock) acceleration (G’s)* m/s2 [ft/s2]

Wn

Weight of nth pump

Ln

Distance from mounting flange to CG (center of gravity) of nth pump

(Refer to Installation Drawings on page 32 to locate CG of pump.)* Carry out calculations by multiplying gravity (g = 9.81 m/s2 [32 ft/s2]) with a given factor. This factor depends
on the application.
Refer to the table below, for allowable overhung load moment values.
Shaft loading parameters
Center of gravity - pump 1

Mounting flange

Center of gravity - pump 2

L1
L2

P400035© Danfoss | May 2024

BC152886484876en-000402 | 25

Technical Information
DDC Axial Piston Pumps Size 20/24
System Design Parameters
Mounting flange loadRated moment (MR)Shock load moment (MS)N•m[lbf•in]N•m[lbf•in]

SAE B flange461[4080]

865[7655]SAE A flange

216[1912]

404[3576]

Only SAE B flange is available for the front pump of Tandem pump.
Typical G loads for various applications
Application

Rated (vibratory) acceleration (GR)Maximum (shock) acceleration (GS)Skid steer loader

410Trencher (rubber tires)

3

8Asphalt paver

2

6Windrower

2

5

Aerial lift

1.5

4

Turf care vehicle

1.5

4

Vibratory roller

610Understanding and minimizing system noise
Noise is transmitted in fluid power systems in two ways: as fluid borne noise, and structure borne noise.
Fluid-borne noise (pressure ripple or pulsation) is created as pumping elements discharge oil into thepump outlet. It is affected by the compressibility of the oil, and the pump’s ability to transition pumping
elements from high to low pressure. Pulsations travel through the hydraulic lines at the speed of sounduntil there is a change (such as an elbow) in the line. Amplitude varies with overall line length andposition.
Structure borne noise is transmitted wherever the pump casing connects to the rest of the system. The
way system components respond to excitation depends on their size, form, material, and mounting.
System lines and pump mounting can amplify pump noise.
Follow these suggestions to help minimize noise in your application:• Use flexible hoses.

•
•
•
•
•

26 | © Danfoss | May 2024

Limit system line length.
If possible, optimize system line position to minimize noise.
If you must use steel plumbing, clamp the lines.
If you add additional support, use rubber mounts.
Test for resonance in the operating range; if possible avoid them.

BC152886484876en-000402

Technical Information
DDC Axial Piston Pumps Size 20/24
System Design Parameters
Size Equations
The following equations are helpful when sizing hydraulic transmissions. Generally, the sizing process is
initiated by an evaluation of the machine system to determine the required transmission speed andtorque to perform the necessary work function. Refer to Selection of Drive Line Components,
BC157786484430, for a more complete description of hydrostatic drive line sizing.

Based on SI units

Based on US units

Vg • n • η v
1000(l/min)Vg • ′p

Input torque M= 20 • π • η

(N•m)
m

Q • ′p•n•πInput power P = M= 600 • η
30 000

Variables:
Vg = Displacement per rev.
pO = Outlet pressurepi = Inlet pressure∆p = pHD – pND (system pressure)n = Speed
ηv = Volumetric efficiency
ηm = Mechanical efficiency
ηt = Overall efficiency (ηv • ηm)© Danfoss | May 2024

(kW)tVg • n • η v(US gal/min)231
Vg • ′p

Input torque M= 2 • π • η(lbf•in)m

Q • ′pM•n•π
Input power P = 198= 1714 • η (hp)000t

SI units [US units]
cm3/rev [in3/rev]
bar [psi]bar [psi]bar [psi]
min-1 (rpm)

BC152886484876en-000402 | 27

Technical Information
DDC Axial Piston Pumps Size 20/24
Model CodeModel Code: A, B, R, C, E, G, M

A - Base Frame Size
Code

Description

20

20 cc/rev

24

24 cc/rev

B - Production Version
Code

Description

A

Product Version "A"

R - Rotation (Viewed from input shaft)
Code

Description

R

Right hand, CW

L

Left hand, CCW

C - Valve Plate
Code

DescriptionRB

CW, High neutral seeking

LB

CCW, High neutral seeking

E - Control Arm Location and Configuration (Viewing from input shaft, system port up)
Code

Description

RSA

Right side, 17mm square, 100% displacement

RSB

Right side, 17mm square, 75% displacement (for 20cc pump only)

LSA

Left side, 17mm square, 100% displacement

LSB

Left side, 17mm square, 75% displacement (for 20cc pump only)G - Neutral Assist Mechanism and Location
Code

Description

NN

None

AN

DetentM - Bypass Valve (align with module J)

28 | © Danfoss | May 2024

Code

Description

A

With bypass

BC152886484876en-000402

Technical Information
DDC Axial Piston Pumps Size 20/24
Model CodeModel Code: H, K, F

H - Loop Flushing (align with module J)
Code

Description

N

None (with Charge/Implement Pump)

D

Defeated Loop Flushing (w/o Charge/Implement Pump)

2

With 2 lpm Flushing @ 7bar (w/o Charge/Implement Pump)

3

With 3.5 lpm Flushing @ 7bar (w/o Charge/Implement Pump)

K - Charge Pump Displacement (align with modules F and J)
CodeDescription

N

None with Aux-Pad

3

3.1 cc/rev Charge Pump, Suction, w/o Aux-pad

54.8 cc/rev Charge Pump, Suction, w/o Aux-pad

B

7.5 cc/rev Charge Pump, Suction, w/o Aux-pad, CW

C

7.5 cc/rev Charge Pump, Suction, w/o Aux-pad, CCW

D

5.4 cc/rev Implement Pump, Remote, w/o Aux-pad, CW

E

5.4 cc/rev Implement Pump, Remote, w/o Aux-pad, CCWF

7.5 cc/rev Implement Pump, Remote, w/o Aux-pad, CW

G

7.5 cc/rev Implement Pump, Remote, w/o Aux-pad, CCW

F - Pump Input Shaft (align with modules K and J)
Description
Code
Input Shaft© Danfoss | May 2024

AA

0.875 inch dia, Straight Key, 33 mm

AB0.875 inch dia, Straight Key, 53 mm

AC

13 teeth, 16/32 pitch

BA

0.875 inch dia, Straight Key, 33 mm

BB

0.875 inch dia, Straight Key, 53 mm

BC

13 teeth, 16/32 pitch

DA

0.875 inch dia, Straight Key, 33 mm

DB

0.875 inch dia, Straight Key, 53 mm

DC

13 teeth, 16/32 pitch

Charge Pump, Aux-Pad

with 3.1/4.8 cc Charge Pump, w/o Aux Spline

w/o Charge Pump, w/ Aux Splinewith 7.5 cc/rev Charge Pump or Implement Pump w/o
Aux Spline

BC152886484876en-000402 | 29

Technical Information
DDC Axial Piston Pumps Size 20/24
Model CodeModel Code: J, S, L

J - Auxiliary Pad Configuration (align with modules M, H, K and F)
CodeDescription
Aux-PadBypass/Loop Flush

AAN9

SAE-A, 9T

Yes/Yes

AAN1

SAE-A, 11T

Yes/Yes

AAN3

SAE-A, 13T

Yes/Yes

ABN9

SAE-A, 9T

Yes/Defeated

ABN1

SAE-A, 11T

Yes/Defeated

ABN3

SAE-A, 13T

Yes/Defeated

ACA0

w/o Aux Pad, for 3.1/4.8 cc/rev Charge Pump

Yes/None

BCF0

w/o Aux Pad, for 7.5 cc/rev Charge Pump or Implement Pump

Yes/NoneS - Input Flange
Code

DescriptionD

SAE B flangeH

SAE A flange

L - Charge Relief Valves & Setting

30 | © Danfoss | May 2024

Code

Description

07

7 bar

11

11 bar14

14 bar18

18 bar21

21 bar

BC152886484876en-000402

Technical Information
DDC Axial Piston Pumps Size 20/24
Model CodeModel Code: N, P, Y, Z

N - System Pressure Protection (Port A) & P - System Pressure Protection (Port B)
Code

Description

00N

Poppet-type Check Valve

14N

High Pressure Relief Valve 140 bar

14A

High Pressure Relief Valve 140 bar w/ Orifice, (∅ 0.85)

17NHigh Pressure Relief Valve 175 bar

17AHigh Pressure Relief Valve 175 bar w/ Orifice, (∅ 0.85)

19NHigh Pressure Relief Valve 190 bar

19A

High Pressure Relief Valve 190 bar w/ Orifice, (∅ 0.85)

21NHigh Pressure Relief Valve 210 bar

21A

High Pressure Relief Valve 210 bar w/ Orifice, (∅ 0.85)

23NHigh Pressure Relief Valve 230 bar

23A

High Pressure Relief Valve 230 bar w/ Orifice, (∅ 0.85)

25NHigh Pressure Relief Valve 250 bar

25A

High Pressure Relief Valve 250 bar w/ Orifice, (∅ 0.85)

28NHigh Pressure Relief Valve 280 bar

28A

High Pressure Relief Valve 280 bar w/ Orifice, (∅ 0.85)

30NHigh Pressure Relief Valve 300 bar

30A

High Pressure Relief Valve 300 bar w/ Orifice, (∅ 0.85)

Y - Special Hardware
Code

Description

NNN

None

Z - Paint and Tag© Danfoss | May 2024

Code

Description

NNNBlack Paint, Danfoss Logo

BC152886484876en-000402 | 31

Technical Information
DDC Axial Piston Pumps Size 20/24
Installation Drawings
With Aux-Pad, No Charge Pump, Left Trunnion, SAE A Flange Configuration

153 ±1.2
System Port “B”

2x 140.5 ±1.2

A-A

C-C

2x
73.6 ±0.8

71 ±0.8

Shaft

Port ISO 11926-1 -7/8-14

2x 28 ±0.5

Shaft

B-B

A

2x
60.4 ±0.8

Charge Pressure
Relief Valve

Shaft
Name Plate
Paint Free

A
System Port “A”
Port ISO 11926-1 -7/8-14
196.5 ±1.2180.5 ±1.2
149 ±1.2

Mounting Flange
77 ±0.8

Case Drain Port “L1”
Port ISO 11926-1 3/4-16

Flange 82-2
Per ISO 3019-1 (SAE A)

63.94 ±0.8
isp 18° Max Disp
° Max D18

High Pressure Relief Valve

CCW

0
6.4 -0.5

CW+0.3
2x Ø11.1 -0.1

0.8 ±0.5
External Charge Supply Port “E”
From Filter
Or Charge Gage Port “M3”BC

Ø95 ±1.5

R0.75 Max

Paint Free

5° ±

4x4

Paint
Free

3°

2x 35 ±0.8 2x 35 ±0.8

12 ±1

108 ±0.8

134.5 ±1.2178.5 ±1.2

79.2 ±1.5+-0 0.06
.0
4

17

2x

8x M8x 1.25
13 Full Thread
Depth*4x M8 taps on the opposite side of the trunnion shaft:
Product shipping from Japan: Painted
Product shipping from USA: Non-Painted

P400133

CW

Input shaft rotation
Trunnion rotation

32 | © Danfoss | May 2024

65 ±1.5

53.2 ±0.3
53.2 ±0.3

BypassValve

X
65 ±1.5

±5°
45°

B

2x35±0.8 2x35 ±0.8
0Ø82.55 -0.05

C

31±0.8 35 ±0.851.5 ±0.8

34 ±0.8 35 ±0.8Port ISO 11926-1 -9/16-18

CCW

Right

Trunnion rotation

CW

Port A flow

Out

Port B flow

In

Left
CCW

Right

CW

CCW

In

In

Out

Out

Left

CW

CCW

CW

CCW

Out

In

Out

Out

In

In

Out

In

In

Out

BC152886484876en-000402

Technical Information
DDC Axial Piston Pumps Size 20/24
Installation Drawings

X

High Pressure Relief Valve180.5±1.2

51.5±0.8

34±0.8(1)35±0.8D

35±0.8D(116)

4x M10 x1.25
18 Full Thread Depth

Approximate
Center of Gravity

134.5±1.2(1)2x 53.2 ±0.2

Port ISO 11926-1 3/4-16

74.5 ±1.5

77±0.880.4 ±1.5

External Charge Supply Port “E”
From Filter
Or Charge Gage Port “M3”Port ISO 11926-1 -9/16-18

149±1.2
Case Drain Port “L2”

2x 53.2 ±0.2

D-D
71±0.82x 140.5 ±1.2
91 ±0.8
System B Gage Port “MB”
Port ISO 11926-1 -9/16-18

E

2x 30.5±1.2

Shaft

E-E
68.5 ±0.8

E
Shaft

Case Drain Port “L3”Port ISO 11926-1 -3/4-16

System A Gage Port “MA”
Port ISO 11926-1 -9/16-18
P400132© Danfoss | May 2024

BC152886484876en-000402 | 33

Technical Information
DDC Axial Piston Pumps Size 20/24
Installation Drawings
With Aux-Pad, No Charge Pump, Left Trunnion, SAE B Flange Configuration

150 ±1.2
150 ±1.2
2x 137.5 ±1.2

System Port "B"
Port ISO 11926-1 -7/8-14

A-A

C-C

2x
73.6 ±0.8

71 ±0.8

Shaft

2x 28 ±0.5

Shaft

B-B

A

2x
60.4 ±0.8

Charge Pressure
Relief Valve

Shaft

A
System Port "A"

Name Plate
Paint Free

Port ISO 11926-1-7/8-14

193.5 ±1.2177.5±1.2
146±1.2

Case Drain Port “L1”
Port ISO 11926-1 -3/4-1674±0.860.94±0.8
Disp 18° Max Disp
18° Max
CW
CCW

High Pressure Relief Valve

Mounting Flange
Flange 101-2
Per ISO 3019-1 (SAE B)+0.3
2x Ø14.3 -0.1

09.7 -0.5
1.5±0.5

External Charge Supply Port “E”
From Filter
Or Charge Gage Port “M3”B

C

R0.75Max

Ø120 ±1.53°

Paint Free
BypassValve

87 ±1.5

73 ±0.3
73 ±0.3

5° ±
4x4

Paint
Free

X

Paint
Free

87 ±1.5

±5°
45°

C
B

2x35±0.8 2x35±0.80Ø101.6 -0.05

31 ±0.8 35 ±0.8

34 ±0.8 35 ±0.851.5 ±0.8Port ISO 11926-1 -9/16-18

2x 35 ±0.8 2x 35 ±0.8 15 ±1
131.5 ±1.2175.5 ±1.2

17
2x

+
-0 0.06.0
4

34 | © Danfoss | May 2024

108 ±0.8

79.2 ±1.5

8x M8x 1.25
13 Full Thread
Depth*4x M8 taps on the opposite side of the trunnion shaft:
Product shipping from Japan: Painted
Product shipping from USA: Non-Painted

P400036

BC152886484876en-000402

Technical Information
DDC Axial Piston Pumps Size 20/24
Installation Drawings

X
177.5 ±1.2High Pressure Relief Valve146 ±1.2

2x 53.2 ±0.2

80.4 ±1.5(1)74.5 ±1.5(2)

D51.5 ±0.8

D

35 ±0.8

External Charge Supply Port “E”
From Filter
Or Charge Gage Port “M3”Port ISO 11926-1 -9/16-18

34 ±0.8 35 ±0.8

Case Drain Port “L2”Port ISO
11926-1 -3/4-16

74 ±0.8

4x M10 x1.25
18 Full Thread
Depth

Approximate
Center of Gravity(111)

2x 53.2 ±0.2131.5 ±1.2

2x 137.5 ±1.2
88 ±0.8

System B Gage Port “MB”

D-D

PORT ISO 11926-1 -9/16-18

71±0.82x 30.5±1.2

Shaft
E

E-E

E

68.5 ±0.8
Shaft

Case Drain Port “L3”
PORT ISO 11926-1 -3/4-18

System A Gage Port “MA”
PORT ISO 11926-1 -9/16-18

P400037© Danfoss | May 2024

BC152886484876en-000402 | 35

Technical Information
DDC Axial Piston Pumps Size 20/24
Installation Drawings
With Charge Pump, No Aux-Pad, Left Trunnion, SAE A Flange Configuration

A-A
2x
73.6 ±0.8

153 ±1.2
2x 140.5 ±1.2
Shaft

System Port “B”

2x 28 ±0.5Port ISO 11926-1 -7/8-14

B-B
71±0.8Charge Pressure
Relief Valve
Shaft

System Port “A”
Port ISO 11926-1 -7/8-14

Name Plate
Paint FreeA

186.5±1.2
149±1.2

Mounting Flange
Flange 82-2
Per ISO 3019-1 (SAE A)

77 ±0.8

Case Drain Port “L1”

63.94±0.8Port ISO
11926-1 3/4-16

Disp 18°Max Disp
18° MaxHigh Pressure
Relief Valve

CCW

CW

+0.3
2x Ø11.1 -0.1

0
6.4 -0.5

0.8±0.5
B

°

° ±3

4x45

53.2 ±0.3
53.2 ±0.3

X
Paint
Free

65 ±1.5±5°2x35 ±0.8 2x35±0.8
0Ø82.55 -0.05

45°

51.5 ±0.8
34 ±0.8 35 ±0.8

B

65 ±1.5

Ø95 ±1.5

R0.75 Max

Paint
Free

BypassValve
2x 35±0.8 2x 35±0.8
134.5±1.2.06+0 0.0417

2x

36 | © Danfoss | May 2024

12±1
8x M8x 1.25
13 Full Thread
Depth

108 ±0.8*4x M8 taps on the opposite side of the trunnion shaft:
Product shipping from Japan: Painted
Product shipping from USA: Non-Painted

79.2 ±1.5P400135

BC152886484876en-000402

Technical Information
DDC Axial Piston Pumps Size 20/24
Installation Drawings

X
Case Drain Port “L2”Port ISO 11926-1 3/4-16

149±1.2(1)

74.5 ±1.5(2)

35 ±0.8

C

R 12.5 Min

80.4 ±1.5

CCharge Gage Port “M3”Port ISO
11926-1 -7/16-20

51.5 ±0.8High Pressure
Relief Valve43.2 ±0.8

77 ±0.8(105)

Approximate
Center of Gravity

149.5 ±1.2

C-C

E-E

71 ±0.8

68.5 ±0.8

2x 140.5 ±1.2

Shaft

91 ±0.8

System B Gage Port “MB”

Shaft

Port ISO 11926-1 -9/16-18
2x 30.5 ±1.2

D
E

D-D
Charge Inlet Port “S”
E

65.6 ±0.8Port ISO 11926-1 -7/8-14

Shaft

D

Case Drain Port “L3”

System A Gage Port “MA”

Port ISO 11926-1 -3/4-16

Port ISO 11926-1 -9/16-18

P400134© Danfoss | May 2024

BC152886484876en-000402 | 37

Technical Information
DDC Axial Piston Pumps Size 20/24
Installation Drawings
With Charge Pump, No Aux-Pad, Left Trunnion, SAE B Flange Configuration

A-A
2x
73.6 ±0.8

150 ±1.2
2x 137.5 ±1.2

Shaft
System Port "B"

2x 28 ±0.5Port ISO 11926-1-7/8-14

B-B
71±0.8A

Charge Pressure
Relief Valve
Shaft
System Port "A"
Port ISO 11926-1-7/8-14

A
Name Plate
Paint Free

183.5 ±1.2
146 ±1.2
74 ±0.8
60.94 ±0.8
Disp 18° Max Disp
18° Max
CW
CCW

Case Drain Port “L1”
Port ISO 11926-1 3/4-16

Mounting Flange
Flange 101-2
Per ISO 3019-1 (SAE B)

0
9.7 -0.5+0.3
2x Ø14.3 -0.1

1.5±0.5

High Pressure
Relief ValveB

73 ±0.3
87 ±1.5

Ø 120 ±1.5

X
Paint
Free

3°

5° ±

4x4

73 ±0.3
87 ±1.5±5°45°2x35±0.8 2x35 ±0.80Ø101.6 -0.05

B

34 ±0.8 35 ±0.8

51.5±0.8

R0.75 Max

BypassValve

Paint Free
2x 35 ±0.8 2x 35 ±0.8

15 ±1
108 ±0.8

131.5 ±1.2

1
2x

7

+
-0 0.06.0
4

38 | © Danfoss | May 2024

79.2 ±1.5

8x M8x 1.25
13 Full Thread
Depth*4x M8 taps on the opposite side of the trunnion shaft:
Product shipping from Japan: Painted
Product shipping from USA: Non-Painted

P400038

BC152886484876en-000402

Technical Information
DDC Axial Piston Pumps Size 20/24
Installation Drawings

X
146±1.2
74±0.8High Pressure
Relief Valve(1)

Port ISO 11926-1 3/4-16

Charge Gage Port “M3”

R 12.5 Min

74.5 ±1.5

51.5 ±0.8(2)

35 ±0.8

C

80.4 ±1.5Port ISO 11926-1 7/16-20

C

43.2 ±0.8

Case Drain Port “L2”Approximate
Center of Gravity(101)

146.5 ±1.2
2x 137.5±1.2
88 ±0.8

C-C

E-E

71±0.868.5±0.8
Shaft

System B Gage Port “MB”
Port ISO 11926-1 9/16-18

Shaft

2x 30.5±1.2

DCharge Inlet Port “S”

EPort ISO 11926-1 7/8-14

D-D
65.6 ±0.8
Shaft

D
Case Drain Port “L3”Port ISO 11926-1 3/4-16

System A Gage Port “MA”
Port ISO 11926-1 9/16-18

P400039© Danfoss | May 2024

BC152886484876en-000402 | 39

Technical Information
DDC Axial Piston Pumps Size 20/24
Installation Drawings
With Implement Pump, No Aux-Pad, Left Trunnion, SAE A Flange Configuration
C-C

A-A

178.5±1.260.9 ±0.8

149 ±1.2
System Port “B”

2x 139 ±1.2

Port ISO 11926-1 7/8-14

2x 30 ±0.559.9 ±0.8

Shaft

A

A

Shaft
B

Charge Gage Port “M3” Or
Implement return Port “E”
Port ISO 11926-1 9/16-18
Charge Pressure
Relief Valve

B-B

D-D

2x
73.6 ±0.8

71±0.8

Shaft
Shaft

B

System Port “A”
Port ISO 11926-1 7/8-14

Name Plate
Paint Free

193.5±1.2178.5±1.2
145±1.8

Case Drain Port “L1”

77±0.8Port ISO
11926-1 3/4-16

63.94±0.8
Disp 18° Max Disp
18° MaxHigh Pressure
Relief Valve

CCW

°

° ±3

2x 35±0.8 2x 35±0.8132.5±1.2

65 ±1.5

53.2 ±0.3
53.2±0.3

4x45

Paint
Free

BypassValve

X
65 ±1.5DØ95 ±1.52x35 ±0.8 2x35±0.8
0Ø82.55 -0.05±5°

R0.75 MaxC.06
+0 0.0417

2x

40 | © Danfoss | May 2024

+0.3
2x Ø11.1 -0.1

D45°

51.5 ±0.8

06.4 -0.5

0.8±0.5

Implement Return
Port “E” Or
Charge Gage Port “M3”C
Port ISO
11926-1 9/16-18
35 ±0.8
32.5 ±0.8 32.5±0.8

CW

Mounting Flange
Flange 82-2
Per ISO 3019-1 (SAE A)

Paint
Free

12±1
8x M8x 1.25
13 Full Thread
Depth

108 ±0.8*4x M8 taps on the opposite side of the trunnion shaft:
Product shipping from Japan: Painted
Product shipping from USA: Non-Painted

79.2 ±1.5P400125

BC152886484876en-000402

Technical Information
DDC Axial Piston Pumps Size 20/24
Installation Drawings

X
180 ±1.2
145 ±1.2

High Pressure
Relief Valve

77±0.8
Case Drain Port “L2”Port ISO 11926-1
3/4-16(1)(5)

51.5 ±0.8

35 ±0.8

FE

80.4 ±1.5

E74.5 ±1.5

21.5 ±0.8

FImplement
Discharge Port “D”(109)

Port ISO
11926-1 -9/16-18
Approximate
Center of Gravity

E-E

G-G

71±0.868.5 ±0.8145.5 ±1.2
2x 139 ±1.2

Shaft

91±0.8GH

H
G

2x 30.5±1.2

System B GagePort “MB”
Port ISO 11926-1
9/16-18

Charge Inlet
Port “S”
Port ISO 11926-1
7/8-14

Shaft

F-F

H-H

60.9 ±0.8

65.6 ±0.8
Shaft
Shaft

Case Drain Port “L3”Port ISO 11926-1
3/4-16© Danfoss | May 2024

System A GagePort “MA”
Port ISO 11926-1
9/16-18

P400124

BC152886484876en-000402 | 41

Technical Information
DDC Axial Piston Pumps Size 20/24
Installation Drawings
With Implement Pump, No Aux-Pad, Left Trunnion, SAE B Flange Configuration

C-C

A-A

175.5 ±1.2
146±1.22x 30±0.560.9 ±0.8

2x 136 ±1.2

System Port “B”
Port ISO 11926-1 -7/8-14

Shaft

A

A

Shaft
B

Charge Gage Port “M3” Or
Implement return Port “E”

B-B

D-D

Port ISO 11926-1 -9/16-18

2x73.6 ±0.8

71±0.8Charge Pressure
Relief Valve

Shaft
B

System Port “A”

Shaft

Name Plate
Paint Free

Port ISO 11926-1 -7/8-14

190.5±1.2175.5±1.2
142±1.8

Case Drain Port “L1”

74±0.8Port ISO 11926-1 3/4-16

60.94±0.8High Pressure
Relief Valvep 18° Max Di

Dis
18° Max
CCW

sp

CW

Mounting Flange
Flange 101-2
Per ISO 3019-1 (SAE B)
0
9.7 -0.5+0.3
2x Ø14.3 -0.1

1.5 ±0.5
D

X

4x45

73 ±0.3

Paint
Free

° ±3

Paint
Free

87 ±1.5

45°DC

87 ±1.5

73 ±0.3

Ø120 ±1.5±5°R0.75 Max

2x35 ±0.8 2x35±0.80Ø101.6 -0.05

32.5 ±0.8 32.5 ±0.8

35 ±0.8

51.5 ±0.8

Implement Return Port “E”
Or Charge Gage Port “M3”C
Port ISO
11926-1 -9/16-18°

BypassValve
2x 35±0.8 2x 35±0.8 15 ±1

108 ±0.8

129.5±1.2.06+0 0.0417

2x

42 | © Danfoss | May 2024

79.2 ±1.5

8x M8x 1.25
13 Full Thread
Depth*4x M8 taps on the opposite side of the trunnion shaft:
Product shipping from Japan: Painted
Product shipping from USA: Non-Painted

P400127

BC152886484876en-000402

Technical Information
DDC Axial Piston Pumps Size 20/24
Installation Drawings
X
Case Drain Port “L2”Port ISO 11926-1
3/4-16177 ±1.2
142 ±1.2

High Pressure
Relief Valve74±0.8(1)

35 ±0.8
51.5 ±0.8

F
E

(5)

80.4 ±1.5

E

(104)

74.5 ±1.5

21.5 ±0.8

FImplement
Discharge Port “D”
Port ISO
11926-1 -9/16-18

Approximate
Center of Gravity

E-E

G-G

71±0.868.5 ±0.8142.5 ±1.2
2x 136 ±1.2

Shaft

88 ±0.8
System B GagePort “MB”

Shaft

G
H

H
G

2x 30.5 ±1.2

Port ISO 11926-1
9/16-18

Charge Inlet
Port “S”
Port ISO 11926-1
7/8-14

Case Drain Port “L3”

System A GagePort “MA”

Port ISO 11926-1
3/4-16

Port ISO 11926-1
9/16-18© Danfoss | May 2024

F-F

H-H

60.9 ±0.8

65.6 ±0.8

Shaft
Shaft

P400126

BC152886484876en-000402 | 43

Technical Information
DDC Axial Piston Pumps Size 20/24
Installation Drawings
Option: Detent“GA” ±0.8
111 ±1.5

Lever mounting surface
Paint free

108 ±1.5

Grease nipple
Paint free

2x 21±0.5

20 ±0.2“GB” ±1.5

2x M10 x 1.5 THRU
P400749

44 | © Danfoss | May 2024

Mounting flange"GA" dimension"GB" dimension

SAE A

63.94

112.44

SAE B

60.94

109.44

BC152886484876en-000402

Technical Information
DDC Axial Piston Pumps Size 20/24
Installation Drawings
Input Shafts: AA, BA, DA
Shaft Availability and Torque Ratings

OptionTorque RatingN•m [lbf•in]

Shaft Data

Maximum TorqueAA, BA, DA

Outer 0.875 inch dia, Straight key, 33mm

226 [2000]

SAE A
+0.4
0

25.4

A-A

2x Full R

18.58

±0.1

.3°

±0

+0.03
Ø52 0

45°

+0.05
6.35 0

A

±0.3

+0.03
Ø22.2 0

3

A
Paint Free

1.5
33

5 ±1

±0.4
±0.3

Mounting Flange

Mating Coupling

Flange 82-2
Per ISO 3019-1 (SAE A)

Must Not Protrude
Beyond This Point
P400128

SAE B+0.4
25.4 03 ±0.318.58 ±0.1

+0.05
6.35 0+0.03
Ø22.2 02x FULL R
°
±0.3
45°

+0.03
Ø52 0

B

B-B

B
Paint Free

1.5
33
Mounting Flange
Flange 101-2
Per ISO 3019-1 (SAE B)

8±1

±0.4
±0.3
Mating CouplingMust Not Protrude
Beyond This Point

P400040© Danfoss | May 2024

BC152886484876en-000402 | 45

Technical Information
DDC Axial Piston Pumps Size 20/24
Installation Drawings
Input Shafts: AB, BB, DB
Shaft Availability and Torque Ratings

OptionTorque RatingN•m [lbf•in]

Shaft Data

Maximum Torque
AB, BB, DB

Outer 0.875 inch dia, Straight key, 53mm

226 [2000]

SAE A
±0.5

A-A

±0.3

2x Full R

18.58

±0.1

.3

° ±0

45

+0.03
Ø52 0

A

+0.05
6.35 04+0.03
Ø22.2 0

36.1

A
Paint Free
1.5 ±0.4
5 ±1

53.5

±0.3

Mating Coupling

Mounting Flange
Flange 82-2
Per ISO 3019-1 (SAE A)

Must Not Protrude
Beyond This Point
P400129

SAE B

36.1

B-B

6.35 +0.05
02x FULL R

45°

+0.03
Ø52 0

B

±0.3

+0.03
Ø22.2 0

4

±0.5

°

±0.3

18.58 ±0.1

B
Paint Free
1.5 ±0.4
53.5 ±0.3
Mounting Flange
Flange 101-2
Per ISO 3019-1 (SAE B)

46 | © Danfoss | May 2024

8 ±1

Mating CouplingMust Not Protrude
Beyond This Point
P400041

BC152886484876en-000402

Technical Information
DDC Axial Piston Pumps Size 20/24
Installation Drawings
Input Shafts: AC, BC, DC
Shaft Availability and Torque Ratings

OptionAC, BC, DC

Torque RatingN•m [lbf•in]

Shaft Data
13 teeth 16/32 pitch per ANSI B92.1-1970
CLASS5

Rated TorqueMaximum Torque180 [1593]

236 [2088]

SAE A

16.5

±0.5

Spline Data

Paint Free

33
5

±0.09

Ø21.72

Ø18.7

±0.12

Ø52

+0.03
0

Number of Teeth: 13
Pitch Fraction : 16/32
Pressure Angle : 30°
Pitch Dia
: Ø20.638
Type of Fit: Fillet Root SidePer
: ANSI B92.1-1970 Class 5

±0.3

±1

Mounting Flange

Mating Coupling

Flange 82-2
Per ISO 3019-1 (SAE A)

Must Not Protrude
Beyond This Point

P400130

SAE B
Spline Data
Number of Teeth: 13
Pitch Fraction : 16/32
Pressure Angle : 30°
Pitch Ø : Ø20.638
Type of Fit : Fillet Root Side
Per : ANSI B92.1-1970 CLASS 5±0.5

33 ±0.3
Mounting Flange
Flange 101-2
Per ISO 3019-1 (SAE B)© Danfoss | May 2024

8 ±1

±0.09
Ø21.72

Paint Free

Ø18.7

±0.12

Ø52 ±0.03
0

16.5

Mating CouplingMust Not Protrude
Beyond This Point
P400042

BC152886484876en-000402 | 47

Technical Information
DDC Axial Piston Pumps Size 20/24
Installation Drawings
Auxiliary Mounting Pads
Shaft Availability and Torque Ratings
Pad Size

FlangeSAE A
ISO3019-1, flange82-2

SAE A Special
SAE A Special

SplineMinimum Spline
Lengthmm [inch]

Maximum TorqueN•m [lbf•in]

9 teeth

13.5 [0.53]

162 [1434]

11 teeth13.5 [0.53]

194 [1717]

13 teeth13.5 [0.53]

207 [1823]1

1 Limited by 23T aux spline.

9 teeth (option)
Auxiliary mounting pad
For mating flange 82-2
per ISO 3019-1 (SAE A)
Spline data:
Number of Teeth: 9
Pitch Fraction : 16/32
Pressure Angle : 30°
Pitch Ø: Ø14.288
Minor Ø: Ø12.89
Type of Fit: Fillet root sidePer
: ANSI B92.1-1970 class 7+0.08
Ø82.6 0+0.13
Ø88.62 0

R0.8 max

O-ring seal required
Ref Ø82.22 ID x 2.62 cross section
M10 x 1.5 (4x)18 Full thread depth
1.96 ± 0.13
Mating shaft must not
protrude beyond this poit

8.1 ± 0.25
14.4 minShaft clearance

32.85 minShaft clearance

48 | © Danfoss | May 2024

Mating shaft shoulder must not
protrude beyond this poit
P400043

BC152886484876en-000402

Technical Information
DDC Axial Piston Pumps Size 20/24
Installation Drawings
11 teeth (option)
Auxiliary mounting pad
For mating flange 82-2
per ISO 3019-1 (SAE A)
Spline data:
Number of Teeth: 11
Pitch Fraction : 16/32
Pressure Angle : 30°
Pitch Ø: Ø17.463
Minor Ø: Ø15.940
Type of Fit: Fillet root sidePer
: ANSI B92.1-1970 class 7+0.08
Ø82.6 0+0.13
Ø88.62 0

R0.8 max

O-ring seal required
Ref Ø82.22 ID x 2.62 cross section
M10 x 1.5 (4x)18 Full thread depth
1.96 ± 0.13
Mating shaft must not
protrude beyond this poit

8.1 ± 0.25
14.4 minShaft clearance

37.85 minMating shaft shoulder must not
protrude beyond this poit
P400044

Shaft clearance

13 teeth (option)
Auxiliary mounting pad
For mating flange 82-2
per ISO 3019-1 (SAE A)
Spline data:
Number of Teeth: 13
Pitch Fraction : 16/32
Pressure Angle : 30°
Pitch Ø: Ø20.638
Minor Ø: Ø19.110
Type of Fit: Fillet root sidePer
: ANSI B92.1-1970 class 7+0.08
Ø82.6 0+0.13
Ø88.62 0

R0.8 max

O-ring seal required
Ref Ø82.22 ID x 2.62 cross section
M10 x 1.5 (4x)18 Full thread depth
1.96 ± 0.13
Mating shaft must not
protrude beyond this poit

8.1 ± 0.25
14.4 minShaft clearance

37.85 minShaft clearance© Danfoss | May 2024

Mating shaft shoulder must not
protrude beyond this poit
P400300

BC152886484876en-000402 | 49

Technical Information
DDC Axial Piston Pumps Size 20/24
Reference Literature

Literature
Refer to the literature listed below for product information and specifications for DDC pumps and other
Danfoss components.
DDC Pumps literature•

DDC Axial Piston Pumps Service Manual AX152986482107

Hydraulic Systems Guidelines

•
•
•
•
•

50 | © Danfoss | May 2024

Hydraulic Fluids and Lubricants Technical Information BC152886484524
Pressure and Speed Limits BC152886484313
Design Guidelines for Hydraulic Fluid Cleanliness BC152886482150
Experience with Biodegradable Hydraulic Fluids, Technical Information 520L465
Selection of Driveline Components BC157786484430

BC152886484876en-000402

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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
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© Danfoss | May 2024

BC152886484876en-000402