Technical Information

Axial Piston Pumps
LPV

www.danfoss.com

Technical Information
LPV Axial Piston Pumps

Revision history

2 | © Danfoss | April 2021

Table of revisions
Date

ChangedRev

April 2021

Changed document number from 'BC00000044' and '520L0954' to 'BC152886483590' andremoved obsolete end cap options

0301

May 2018

add straight keyed shaft

0103

September 2017 update model code

0102

July 2015

Danfoss Layout

0100

January 2009

neutral assist return mechanism - changes

AF

October 2008

added serial number plate drawing

AE

April 2008changes to auxilliary mounting dimensions

AD

August 2007

revised endcap and loop flusing options in model codeAC

May 2007

correct displacement errors

AB

July 2006

First edition

A-0

BC152886483590en-000301

Technical Information
LPV Axial Piston Pumps
Contents
General description
Overview..............................................................................................................................................................................................4
Design...................................................................................................................................................................................................4
Typical applications......................................................................................................................................................................... 4
LPV product specifications............................................................................................................................................................4
Design...................................................................................................................................................................................................6
Direct displacement drive system.............................................................................................................................................. 7
LPV Pump schematic diagram.....................................................................................................................................................7
Operating parameters
Overview..............................................................................................................................................................................................8
Input speed.........................................................................................................................................................................................8
System pressure................................................................................................................................................................................8
Pressure Ratings................................................................................................................................................................................8
Viscosity............................................................................................................................................................................................... 8
Temperature.......................................................................................................................................................................................9
Case pressure..................................................................................................................................................................................... 9
Independent braking system.......................................................................................................................................................9Reservoir.............................................................................................................................................................................................. 9
System design parameters
Case drain......................................................................................................................................................................................... 10
Charge flow requirements..........................................................................................................................................................10
Loop flushing...................................................................................................................................................................................10
Bearing loads and life................................................................................................................................................................... 10
Applications with external shaft loads..............................................................................................................................10
Hydraulic unit life........................................................................................................................................................................... 12
Mounting flange loads.................................................................................................................................................................12
Estimating overhung load moments.................................................................................................................................12
Input shaft torque rating and spline lubrication................................................................................................................ 13
Understanding and minimizing system noise.....................................................................................................................13
Sizing equations............................................................................................................................................................................. 14
Fluids.................................................................................................................................................................................................. 14
Filtration system............................................................................................................................................................................. 15
Charge filtration........................................................................................................................................................................ 15
Suction filtration....................................................................................................................................................................... 16
Operation
HPRV (High pressure relief valve)............................................................................................................................................. 17
Bypass function...............................................................................................................................................................................17
CPRV (Charge pressure relief valve)........................................................................................................................................ 17
Loop flushing valve....................................................................................................................................................................... 18
Neutral return mechanism..........................................................................................................................................................18
Technical specifications
Specifications...................................................................................................................................................................................20
Product coding
LPV Model Code............................................................................................................................................................................. 23
Features and options
Controls............................................................................................................................................................................................. 26
Direct displacement control................................................................................................................................................. 26
Features and benefits..............................................................................................................................................................26
Control handle requirements...............................................................................................................................................26
Input shafts.......................................................................................................................................................................................26
Auxiliary mounting pads............................................................................................................................................................. 27
SAE-A Auxiliary mounting..................................................................................................................................................... 27
Installation drawings
LPV Installation drawings............................................................................................................................................................29
LPV Schematic.................................................................................................................................................................................30© Danfoss | April 2021

BC152886483590en-000301 | 3

Technical Information
LPV Axial Piston Pumps
General description
Overview
LPV is a family of variable displacement, axial piston pumps for closed circuit applications. The LPV family
is uniquely designed to optimize performance, size, and cost, matching the work requirements of thedemanding turf care and utility vehicle marketplace. This document gives the detailed specifications andfeatures for LPV pumps.
DesignHigh performance

•
•
•
•

Displacements 25 cm³/rev [1.53 in3/rev], 30 cm³/rev [1.83 in3/rev], 35 cm³/rev [2.14 in3/rev]
Speeds up to 3600 rpm
Pressures up to 210 bar [3045 psi] continuous, and 345 bar [5000 psi] peak
Direct displacement control

Latest technology

•
•
•
•
•
•

Customer-driven using quality function deployment (QFD) and design for manufacturability (DFM)
techniques
Optimized valve plates for quiet operation
Compact package size minimizing installation space requirements
Single piece rigid housing to reduce noise and leak paths
Integrated neutral return mechanism for simplified installation
Optional loop flushing for circuit flexibility

Reliability

•
•
•
•

Designed to rigorous standards
Proven in both laboratory and field
Manufactured to rigid quality standards
Long service life

Typical applications••

Turf care
Utility vehicles

LPV product specifications
Basic units
The LPV pumps provide an infinitely variable speed range between zero and maximum in both forward
and reverse modes of operation.
LPV pumps are compact, high power density units. All models use the parallel axial piston/slipper
concept in conjunction with a tiltable swashplate to vary the pump's displacement. Reversing the angleof the swashplate reverses the flow of fluid from the pump, reversing the direction of rotation of theoutput motor.

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Technical Information
LPV Axial Piston Pumps
General description
LPV pump

Serial number plate

Model
Code

LPVAAADAEACCABDDDRAFFBNNN***
83002847
A084012345

Part Number
Serial Number

Made in USA
Place of Manufac ture

P107852© Danfoss | April 2021

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Technical Information
LPV Axial Piston Pumps
General description
Design
LPV is a family of hydrostatic pumps for low to medium power applications with maximum loads of 345
bar [5000 psi]. You can apply these pumps with other products in a system to transfer and control
hydraulic power.
LPV pumps provide an infinitely variable speed range between zero and maximum in both forward andreverse modes of operation. LPV pumps come in three displacements (25 cm3 [1.53 in3], 30 cm3 [1.83 in3],
and 35 cm3 [2.14 in3]).
LPV pumps are compact, high power density units. All models use the parallel axial piston / slipper
concept in conjunction with a tiltable swashplate to vary the pump's displacement. Reversing the angleof the swashplate reverses the flow of fluid from the pump, reversing the direction of rotation of the
motor output.
LPV pumps have an internal neutral return mechanism for ease of installation, and are available with
optional loop flushing for circuit flexibility. LPV pumps can receive charge flow from an auxiliary circuit orfrom a gear pump mounted on the auxiliary mounting pad. LPV pumps feature an SAE A auxiliary
mounting pad to accept auxiliary hydraulic pumps for use in complementary hydraulic systems.
LPV pumps include a trunnion style direct displacement control.
LPV cross section
TrunionTapered roller bearing

Cylinder block
Valve plate
Ball bearing

Input shaft

Needle bearing
PistonCylinder block spring

6 | © Danfoss | April 2021

Slipper

Swashplate

P106271

BC152886483590en-000301

Technical Information
LPV Axial Piston Pumps
General description
Direct displacement drive system
The direct displacement control varies the swashplate angle. Swashplate angle determines pump flow
and motor speed.
Pictorial circuit diagram

Heat exchanger
bypassReservoir

FilterHeat
exchanger

Cylinderblockassembl y

Charge relief
valve

OMR
orbitalmotor

Charge pump
Bypass
valve

Input
shaft

Outputshaft
Suction flow

Variable
displacement
pump

HPRV valves

Charge pressur eLoop flushing valvesServo pressur eHigh pressur eCase flow

P100586

The diagram shows an LPV pump driving an OMR motor. The system shown uses an external charge pump and external filter. Chargepressure relief valves, high pressure relief valves, and loop flushing valves are shown separated from the pump to provide clarity to thehydraulic system.
LPV Pump schematic diagram
Charge pressure
inlet
L2
Port APort B

L1© Danfoss | April 2021

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Technical Information
LPV Axial Piston Pumps
Operating parameters
Overview
This section defines the operating parameters and limitations for LPV pumps with regard to input speeds
and pressures. For actual parameters, refer to Technical specifications on page 20.
Input speed
The table in Technical specifications on page 20, gives rated and maximum speeds for eachdisplacement. Not all displacements operate under the same speed limits. Definitions of these speed
limits appear below.
Continuous speed is the maximum recommended operating speed at full power condition. Operating ator below this speed should yield satisfactory product life. Do not exceed maximum pump speed during
unloaded, on-road travel over level ground.
Maximum speed is the highest operating speed permitted. Exceeding maximum speed reduces pumplife and can cause loss of hydrostatic power and braking capacity. Never exceed the maximum speed
limit under any operating conditions.

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.

System pressure
The table in Technical specifications on page 20, gives maximum and maximum working pressure
ratings for each displacement. Not all displacements operate under the same pressure limits. Definitionsof the operating pressure limits appear below.
Pressure Ratings
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 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.
Minimum low loop pressure must be maintained under all operating conditions to avoid cavitation.
All pressure limits are differential pressures referenced to low loop (charge) pressure. Subtract low looppressure from gauge readings to compute the differential.

Viscosity
Maintain fluid viscosity within the recommended range for maximum efficiency and bearing life.
Minimum viscosity should only occur during brief occasions of maximum ambient temperature and8 | © Danfoss | April 2021

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Technical Information
LPV Axial Piston Pumps
Operating parameters
severe duty cycle operation. Maximum viscosity should only occur at cold start. Limit speeds until thesystem warms up. Refer to Specifications on page 20, for specifications.
Temperature
Maintain fluid temperature within the limits shown in the table. Technical specifications on page 20.
Minimum temperature relates to the physical properties of the component materials. Cold oil will notaffect the durability of the pump components, however, it may affect the ability of the pump to provide
flow and transmit power. Maximum temperature is based on material properties. Don't exceed it.
Measure maximum temperature at the hottest point in the system. This is usually the case drain. Refer toSpecifications on page 20, for specifications.
Ensure fluid temperature and viscosity limits are concurrently satisfied.

Case pressure
Do not allow case pressure to exceed ratings under normal operating conditions. During cold start, keepcase pressure 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.

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.

Reservoir
The reservoir provides clean fluid, dissipates heat, and removes trapped air from the hydraulic fluid. It
allows for fluid volume changes associated with fluid expansion and cylinder differential volumes.
Minimum reservoir capacity depends on the volume needed to perform these functions. Typically, acapacity of 5/8 of the charge pump flow (per minute) is satisfactory for a closed reservoir. Open circuit
systems sharing a common reservoir require greater fluid capacity.
Locate the reservoir outlet (suction line) near the bottom, allowing clearance for settling foreign particles.
Use a 100 - 125 µm screen covering the outlet port.
Place the reservoir inlet (return lines) below the lowest expected fluid level, as far away from the outlet as
possible. Use a baffle (or baffles) between the reservoir inlet and outlet ports to promote de-aeration andreduce fluid surging.

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Technical Information
LPV Axial Piston Pumps
System design parameters
Case drain
Connect the case drain line to one of the case outlets to return internal leakage to the system reservoir.
Use the higher of the outlets to promote complete filling of the case. Case drain fluid is typically thehottest fluid in the system. Return case drain flow through the heat exchanger to the reservoir.
Charge flow requirements
All LPV pumps applied in closed circuit installations require charge flow. The charge pump provides flow
to make up internal leakage, maintain a positive pressure in the main circuit, provide flow for cooling andfiltration, replace any leakage losses from external valving or auxiliary systems, and to provide flow andpressure for the control system.
Many factors influence the charge flow requirements and charge pump size selection. These factors
include system pressure, pump speed, pump swashplate angle, type of fluid, temperature, size of heatexchanger, length and size of hydraulic lines, control response characteristics, auxiliary flow
requirements, hydrostatic motor type, etc. When sizing and selecting hydrostatic units for an application,
it is frequently not possible to have all the information necessary to accurately evaluate all aspects ofcharge pump size selection.
Maintain charge pressure at the level specified in the table Technical specifications on page 20 under all
operating conditions to prevent damage to the transmission. Danfoss recommends testing under actual
operating conditions to verify this.
Charge pump displacement should be at least 10% of the total displacement of all axial piston
components in the system. However, unusual application conditions may require a more detailed review
of charge pump sizing. Refer to Selection of Drive line Components, BLN-9985, for a more detailed
selection procedure, or contact your Danfoss representative for assistance.
Loop flushing
Closed circuit systems may require loop flushing to meet temperature and cleanliness requirements. A
loop flushing valve removes hot fluid from the low pressure side of the system loop for additional coolingand filtering. Ensure the charge pump provides adequate flow for loop flushing and the loop flushingvalve does not cause charge pressure to drop below recommended limits.
LPV utilizes a special loop flushing spool design. On dual path systems, take special care to verify
acceptable performance.

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 and viscosity.
In vehicle propel drives with no external shaft loads and where the system pressure and swashplate angle
are changing direction and magnitude regularly, the normal L20 bearing life (80 % survival) will exceed
the hydraulic load-life of the unit.
In non propel drives such as vibratory drives, conveyor drives, or fan drives, the operating speed andpressure are often nearly constant and the swashplate angle is predominantly at maximum. These drives
have a distinctive duty cycle compared to a propulsion drive. In these types of applications a bearing life
review is recommended.
Applications with external shaft loads
LPV pumps have bearings that can accept some external radial and thrust loads. When external loads arepresent, the allowable radial shaft loads are a function of the load position relative to the mounting
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Technical Information
LPV Axial Piston Pumps
System design parameters
flange, the load orientation relative to the internal loads, and the operating pressures of the hydraulicunit. In applications with external shaft loads, you can minimize the impact on bearing life with proper
orientation of the load.
Optimum pump orientation is a consideration of the net loading on the shaft from the external load, thepump 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 0° or 180° such that the external side load acts 90° to the rotating group load.
• 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 (90° or 270°) the internal rotating group load.
The direction of internal loading is a function of rotation and which system port has flow out. Contact
Danfoss for a bearing life review if external side loads are present.
You can calculate the maximum allowable radial load (Re), using the formula below, the maximum
external moment (Me) from the table on the next page, and the distance (L) from the mounting flange tothe load.
Re = Me / L
Avoid thrust loads in either direction.
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.
Tapered output shafts or clamp-type couplings are recommended for applications where radial shaft sideloads are present.
Direction of external shaft load
0° Re
Orient radial shaft
load to 90° or 270°
(opposite ofblock load)

End viewof shaft

90° Re270° Re

Axis ofswashplate
rotation

180° ReP100595

Shaft loading parameters
Re

Maximum radial load

Me

Maximum external moment

L

Distance from mounting flange to point of load

Fb

Force of blockTe

Thrust load

Maximum external shaft moments
LPV
Me /N•m [in•lbf]© Danfoss | April 2021

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Technical Information
LPV Axial Piston Pumps
System design parameters
Diagram of external radial shaft loads

0 Re

L
Re
Te

90 Re

270 ReFb

180 ReP106280

Hydraulic unit life
Hydraulic unit life is the life expectancy of the hydraulic components. It is a function of speed andsystem pressure. System pressure is the dominant operating variable. High pressure, which results fromhigh 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.
LPV 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.
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 29 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 Specifications on page 20, for allowable overhung load moment values.
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Technical Information
LPV Axial Piston Pumps
System design parameters
Shaft loading parameters
Center of gravity - pump 1

Mounting flange

Center of gravity - pump 2

L1
L2
P106285

Input shaft torque rating and spline lubrication
A spline running in oil-flooded environment provides superior oxygen restriction in addition tocontaminant flushing. An oil-flooded spline is found in a pump to pump drive (mounted on the auxiliary
pad of another pump). An oil-flooded spline connection can withstand a continuously applied torque up
to the published maximum rating. Maximum torque ratings are based on torsional fatigue strength of
the shaft and assume a maximum of 200,000 load reversals.
Coupling arrangements that are not oil-flooded require a reduced torque rating due to spline tooth wear.
Contact your Danfoss representative for torque ratings if your application involves non oil-flooded
couplings.
Danfoss recommends mating splines adhere to ANSI B92.1-Class 5. Danfoss external splines are modifiedclass 5 fillet root side fit. The external major diameter and circular tooth thickness dimensions are reduced
to ensure a good clearance fit with the mating spline. See Input shafts on page 26 for full spline
dimensions and data.
Maintain a spline engagement at least equal to the pitch diameter to maximize spline life. Spline
engagement of less than ¾ pitch diameter is 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.
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.
Torques are additive for multiple pump installations. Ensure total through torque for the main pump andauxiliary pump does not exceed published maximum shaft torque. See Input shafts on page 26 for shaft
torque ratings.
Understanding and minimizing system noise
A table in the Specifications on page 20, gives sound levels for each displacement. Sound level data arecollected at various operating speeds and pressures in a semi-anechoic chamber. Many factors contributeto the overall noise level of any application. Here is some information to help understand the nature ofnoise in fluid power systems, and some suggestions to help minimize it.
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© Danfoss | April 2021

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Technical Information
LPV Axial Piston Pumps
System design parameters
elements from high to low pressure. Pulsations travel through the hydraulic lines at the speed of sound(about 1400 m/s [4600 ft/sec] in oil) until there is a change (such as an elbow) in the line. Amplitude varies
with overall line length and position.
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.

•
•
•
•
•

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 resonants in the operating range, if possible avoid them.

Sizing equations
Use these equations to help choose the right pump size and displacement for your application. An
evaluation of the machine system to determine the required motor speed and torque to perform thenecessary work function initiates the design process. Refer to Selection of drive line components,
BLN-9985, for a more complete description of hydrostatic drive line sizing. First select motor size totransmit the maximum required torque. Then select pump as a flow source to achieve the maximum
motor speed.

FluidsRatings 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. Never mix hydraulic fluids of different types.
Fire resistant fluids are also suitable at modified operating conditions. Please see Hydraulic Fluids andLubricants Technical Information, BC152886484524, for more information. Refer to Experience with
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Technical Information
LPV Axial Piston Pumps
System design parameters
Biodegradable Hydraulic Fluids Technical Information, 520L0465, for information relating tobiodegradable fluids.
The following hydraulic fluids are suitable:• Hydraulic Oil ISO 11 158 - HM (Seal compatibility and vane pump wear resistance per DIN 51 524-2
must be met)
• Hydraulic Oil ISO 11 158 - HV (Seal compatibility and vane pump wear resistance per DIN 51 524-3
must be met)
• Hydraulic Oil DIN 51 524-2 - HLP• Hydraulic Oil DIN 51 524-3 - HVLP

•
•
•
•
•

Automatic Transmission Fluid (ATF) A Suffix A (GM)
Automatic transmission fluid Dexron II (GM), which meets Allison C-3 and Caterpillar TO-2 test
Automatic transmission fluid M2C33F and G (Ford)
Engine oils API classification SL, SJ (for gasoline engines) and CI-4, CH-4, CG-4, CF-4 and CF (for diesel
engines)
Super Tractor Oil Universal (STOU) special agricultural tractor fluid

Filtration system
To prevent premature wear, ensure only clean fluid enters the hydrostatic transmission circuit. Danfoss
reccommends a filter capable of controlling the fluid cleanliness to ISO 4406 class 22/18/13 (SAE J1165) or
better, under normal operating conditions.
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. Select filters to meet the above
requirements using rating parameters of efficiency and capacity.
You can express measured filter efficiency 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 should be satisfactory. For some open circuit systems, and closed
circuits with cylinders being supplied from the same reservoir, we recommend a considerably higher
filter efficiency. This also applies to systems with gears or clutches using a common reservoir. Thesesystems typically require a charge pressure or return filtration system with a filter β-ratio in the range of
β15-20 = 75 (β10 ≥ 10) or better.
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.
Ensure fluid entering pump is free of contaminants to prevent damage (including premature wear) to thesystem. LPV pumps require system filtration capable of maintaining fluid cleanliness at ISO 4406-1999
class 22/18/13 or better.
Consider these factors when selecting a system filter:
Cleanliness specifications

•
•
•
•

Contaminant ingression rates
Flow capacity
Desired maintenance interval

Locate filter either on the inlet (suction filtration) or discharge (charge pressure filtration) side of thecharge pump. Either strategy is applicable for LPV pumps.
Charge filtration
The pressure filter is remotely mounted in the circuit after the charge pump, as shown in theaccompanying illustration.
1

Filter βx-ratio is a measure of filter efficiency defined by ISO 4572. It is defined as the ratio of the number of particles greater than agiven diameter (“x” in microns) upstream of the filter to the number of these particles downstream of the filter.

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Technical Information
LPV Axial Piston Pumps
System design parameters
Filters used in charge pressure filtration circuits must be rated to at least 34.5 bar [500 psi] pressure.
Danfoss recommends locating a 100 - 125 µm screen in the reservoir or in the charge inlet line whenusing charge pressure filtration.
A filter bypass valve is necessary to prevent damage to the system. In the event of high pressure drop
associated with a blocked filter or cold start-up conditions, fluid will bypass the filter. Avoid working with
an open bypass for an extended period. We recommend a visual or electrical bypass indicator. Proper
filter maintenance is mandatory.
Charge filtration

Strainer

Reservoir

Filterwith bypass
To Low Pressur eside of loop
and ser vo contro l

Charge relief
valveChargepump

To pump case
P106279

Suction filtration
The suction filter is placed in the circuit between the reservoir and the inlet to the charge pump as shownin the accompanying illustration.
Suction filtration

Filter

To low pressure
side of loop
and ser vo contro lStrainer
Reservoir

Charge reliefvalve

To pump case

Chargepump
P106352

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Technical Information
LPV Axial Piston Pumps
Operation
HPRV (High pressure relief valve)
LPV pumps are equipped with a combination high pressure relief and charge check valve. The highpressure relief function is a dissipative (with heat generation) pressure control valve for the purpose oflimiting excessive system pressures. The charge check function acts to replenish the low-pressure side of
the working loop with charge oil. Each side of the transmission loop has a dedicated HPRV valve that is
non-adjustable with a factory set pressure. When system pressure exceeds the factory setting of thevalve, oil is passed from the high pressure system loop, into the charge gallery, and into the low pressure
system loop via the charge check. The high pressure relief valve used on LPV is designed to remove
pressure spikes for short periods of time. Operating over the high pressure relief valve for extended
periods may damage the pump.
HPRV valve

P106273

Bypass function
The LPV contains a dedicated bypass valve. the bypass function is activated when the bypass valve ismechanically backed out 3 full turns (maximum). The bypass function allows a machine or load to be
moved without rotating the pump shaft or prime mover.
Bypass valve

P106286

C Caution
Excessive speed or extended movement will damage the pump and motor(s)Avoid excessive speeds and extended load/vehicle movement. Do not move the load or vehicle morethan 20 % of maximum speed or for longer than 3 minutes. When the bypass function is no longer
needed, reseat the bypass valve to the normal operating position.

CPRV (Charge pressure relief valve)
An internal charge relief valve regulates charge pressure. The charge pump supplies pressure to maintaina minimum pressure in the low side of the transmission loop.

© Danfoss | April 2021

BC152886483590en-000301 | 17

Technical Information
LPV Axial Piston Pumps
Operation
CPRV valve

P106274

Minimum charge pressure is the lowest pressure allowed to maintain a safe working condition in the
low side of the loop.
Maximum charge pressure is the highest charge pressure allowed which provides normal component
life. Elevated charge pressure can be used as a secondary means to reduce the swashplate response time.
The charge pressure setting listed in the order code is the set pressure of the charge relief valve with thepump in neutral, operating with 5 gpm of charge flow. The charge pressure setting is referenced to casepressure. Charge pressure is the differential pressure above case pressure.
LPV is designed for a maximum charge flow of 57 L/min [15 US gal/min].
Loop flushing valve
LPV pumps incorporate an optional integral loop flushing valve, which removes heat and contaminantsfrom the main loop.
LPV utilizes a special loop flushing spool design. On dual path systems, take special care to verify
acceptable performance.
Loop flushing valve

P106276

Neutral return mechanism
The neutral return mechanism mechanically returns the pump to zero displacement. A cam allows
precise zero displacement adjustment.
Maximum return force of the neutral return mechanism is 5.65 N•m [50 lbf•in]

W Warning
Failure of the pump to return to neutral in the absence of control input will cause unintended
vehicle movement. Some control systems may require an additional neutral return mechanism toovercome friction in the control linkage. Verify pump returns to neutral under all operating conditions
when the control is released.

18 | © Danfoss | April 2021

BC152886483590en-000301

Technical Information
LPV Axial Piston Pumps
Operation
Neutral return adjustment screw
Adjusting screw
Lock/seal nut

P106277

Neutral return mechanism
Swashplate
Shaft

Adjusting cam© Danfoss | April 2021

Neutralreturnarm P106278

BC152886483590en-000301 | 19

Technical Information
LPV Axial Piston Pumps
Technical specifications
Specifications
General specifications
DesignAxial piston pump of trunion swashplate design with variable displacement

Direction of rotation

Clockwise, counter-clockwise

Port connections

Main pressure ports: SAE straight thread O-ring boss

Recommended installation
position

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

Physical properties
Displacement
Feature

Unit

25

30

35

Maximum displacement

cm³ [in³]

25 [1.53]

30 [1.83]

35 [2.14]

Flow at rated speed (theoretical)l/min[US gal/min]

85.2[22.5]

104.9[27.7]

137.0[36.2]

Input torque at maximum displacement(theoretical)

N•m/ bar[lbf•in/1000 psi]

0.4
[244]

0.5
[291]

0.6
[340]

Mass moment of inertia of internal rotating kg•m²
components[slug•ft²]

0.001670[0.0012]0.001580[0.00120]0.001530[0.0011]Weight23 [51]kg [lb]Rotation

Clockwise, counter-clockwise

Mounting

SAE B 2 bolt

Auxiliary mounting

SAE J744 A 9T, SPCL 11T

System ports (type)

1 1/16-12 UNF-2B ORB

System ports (location)

Twin radial

Control types

Direct displacement control

ShaftsSplined SAE 13 tooth, 15 tooth

Case drain ports

1 1/16-12 SAE ORB

Operating parameters
Displacement
Rating

Units

25

30

35

Input speed2

min-1 (rpm)

Pressure

500

500

500

continuous

minimum

3400

3500

3600

maximum

3950

4150

4300

400 [5800]

350 [5075]

300 [4350]

415 [6020]

400 [5800]

350 [5075]

63,00037,000maximum working

bar [psi]

maximum
External shaft loads External moment (Me)

7.7 [68]750 [169]

Bearing life (max.
swashplate angle
and max.
continuous speed)

at 210 bar [3045 psi]

B10 hours

120,000

Charge pressure

minimumbar [psi]

6 [87]

maximum

20 | © Danfoss | April 2021

N•m [lbf•in]Thrust in (Tin), out (Tout) N [lbf]30 [435]

BC152886483590en-000301

Technical Information
LPV Axial Piston Pumps
Technical specifications
Operating parameters (continued)
Displacement
RatingCase pressure

rated

Units

25

bar [psi]

2 [29]

maximum

30

35

6 [87]

Sound levels1dB(A)100 bar [1450 psi]

200 bar [2900 psi]

300 bar [4350 psi]

Displ. cm³ [in³]1000 min-1(rpm)1000 min-1(rpm)1000 min-1(rpm)

25 [1.53]

62

66

68

35 [2.14]

61

66

69

dB(A)

100 bar [1450 psi]

200 bar [2900 psi]

300 bar [4350 psi]

Displ. cm³ [in³]3000 min-1(rpm)3000 min-1(rpm)3000 min-1(rpm)

25 [1.53]

70

74

76

35 [2.14]

71

75

80

1Sound data was collected per ISO 4412-1 in a semi-anechoic chamber. Values have been adjusted (-3 dB)

to reflect anechoic levels.
Fluid specifications
FeatureViscosity

Minimum
Recommended range

Unit

Displacement cm³ [in³]
25 [1.53], 30 [1.83], 35 [2.14]mm2/sec[SUS]

7 [47]

Maximum
Temperature
Range2Filtration

12-60 [66-278]
1600 [7500]

Minimum°C [°F]-40 [-40]

Rated

82 [180]

Maximum intermittent

100 [212]

Cleanliness per ISO 4406
Efficiency (charge pressure
filtration)

22/18/13
β-ratio

Efficiency (suction filtration)
Recommended inlet screenmesh size

β15-20= 75 (β10≥ 10)
β35-45= 75 (β10≥ 2)μm

100 - 125

2At the hottest point, normally case drain port.

Mounting flange - allowable overhung parameters
Continuous load moment (Mc)© Danfoss | April 2021

Shock load moment (Ms)N•m[lbf•in]N•m[lbf•in]

361[3200]

617[5470]BC152886483590en-000301 | 21

Technical Information
LPV Axial Piston Pumps
Technical specifications
Mounting flange - G-factors for sample applications
Application

Continuous (vibratory)
acceleration (Gc)

Maximum (shock) acceleration(Gs)

Skid steer loader

610Trencher(rubber tires)

6

8Asphalt paver

6

6Windrower

6

5

Aerial lift

6

4

Turf care vehicle

64

Vibratory roller

610Applications experiencing extreme resonant vibrations may require additional pump support. Refer toSystem design parameters on page 10 for information concerning mounting flange loads.

22 | © Danfoss | April 2021

BC152886483590en-000301

Technical Information
LPV Axial Piston Pumps
Product coding

L

P

V

Seal Group

Input Shaft

Rotation, Kit, & Valveplate

Charge Pump

Charge Pressure

Endcap, Loop Flush,& Aux Pad

Neutral Assist

Bypass Valve

System Pressure
Protection

Control Orientation & Type

Control Handle

Control Orifice

Auxiliary Mounting Flange

Special Hardware

Special Features(Non Hardware)

Product

Swashplate GroupLPV Model Code

C

D

E

F

G

H

J

K

L

M

N

P

R

S

T

Z

■ ■ ■ ■ ■ □ □□ □ □ □□□ □□ □ □□ □ □□□□□□Product
Code

Description

LPV

LPV variable displacement pump

C Swashplate Group
Code

Description

A

Right hand swashplateC

Left hand swashplate

D Seal Group
Code

Description

A

Standard shaft seal

E Input Shaft Configuration
Code

Description

A

13 Tooth splined 16/32 pitch

B

15 Tooth splined 16/32 pitch

C

20 Tooth splined 24/48 pitch

D

Round straight key Dia. 22.2mm (key not supplied)

F Rotating kit, rotation and valveplate
Code

Displacement

A

CW rotation 25 cm³/rev [1.50 in³/rev]

B

CW rotation 30 cm³/rev [1.83 in³/rev]

C

CW rotation 35 cm³/rev [2.14 in³/rev]

D

CCW rotation 25 cm³/rev [1.50 in³/rev]

E

CCW rotation 30 cm³/rev [1.83 in³/rev]F

CCW rotation 035 cm³/rev [2.14 in³/rev]J

CW rotation 25 cm³/rev [1.50 in³/rev] low leakageK

CW rotation 30 cm³/rev [1.83 in³/rev] low leakage

L

CW rotation 35 cm³/rev [2.14 in³/rev] low leakage

G Charge Pump Displacement© Danfoss | April 2021

Code

Description

A

None

BC152886483590en-000301 | 23

Technical Information
LPV Axial Piston Pumps
Product coding
H Charge Pressure Relief Valve Setting
Code

DescriptionC

9.0 bar [130 psi]

E

11.0 bar [160 psi]

G

14.0 bar [200 psi]

I

18.0 bar [260 psi]

K

23.0 bar [335 psi]

J End Cap and Loop Flushing
Code

Description

AA

High loop flushing, 7.6 l/min [2 US gal/min] at 260 psid charge, RH control, SAE A flange 0
Deg.

AB

Low loop flushing, 3.8 l/min [1 US gal/min] at 260 psid charge, RH control, SAE A flange 0
Deg.

AC

No loop flushing, RH control, SAE A flange 0 Deg.

DA

High loop flushing, 7.6 l/min [2 US gal/min] at 260 psid charge, RH control, SAE A flange 90
Deg.

DB

Low loop flushing, 3.8 l/min [1 US gal/min] at 260 psid charge, RH control, SAE A flange 90
Deg.

DC

No loop flushing, RH control, SAE A flange 90 Deg.

EC

No loop flushing, RH control, SAE B flange 0 Deg.

FA

High loop flushing, 7.6 l/min [2 US gal/min] at 260 psid charge, single side only, SAE A
flange 90 Deg.

K Neutral Return
Code

Description

C

Neutral assist, standard

D

Neutral assist, high force

L Bypass Valve
Code

Description

A

Bypass valve

M System Pressure Protection

24 | © Danfoss | April 2021

Code

Description

AAA

None/none

BBB

175 bar [2540 psi]/175 bar [2540 psi]

BCC

190 bar [2755 psi]/190 bar [2755 psi]

BDD

210 bar [3045 psi]/210 bar [3045 psi]

BEE

230 bar [3325 psi]/230 bar [3325 psi]

BFF

250 bar [3625 psi]/250 bar [3625 psi]

BGG

280 bar [4060 psi]/ 280 bar [4060 psi]

BHH

300 bar [4350 psi]/300 bar [4350 psi]

BJJ

345 bar [5000 psi]/345 bar [5000 psi]

BMM

140 bar [2030 psi]/ 140 bar [2030 psi]

BRR

325 bar [4712 psi]/ 325 bar [4712 psi]

BC152886483590en-000301

Technical Information
LPV Axial Piston Pumps
Product coding
N Control Type and Orientation
Code

DescriptionDR

Direct displacement control, right sideDL

Direct displacement control, left side

P Control
Code

Description

A

DDC

R Control Orifice Diameter
Code

Description

FF

N/A

S Housing and Auxiliary Mounting
Code

DescriptionA

SAE A, 11T spline, running coverB

SAE A, 9T spline, running coverE

SAE B, 13T spline, running coverN

SAE A, none, running cover

T Special Hardware Features
Code

Description

NNN

None

ZZ Special Features (non hardware)© Danfoss | April 2021

Code

Description

***

None

BC152886483590en-000301 | 25

Technical Information
LPV Axial Piston Pumps
Features and options
Controls
Direct displacement control
The LPV pump features Direct Displacement Control (DDC). The swashplate angle is set directly by acontrol lever or linkage attached directly to the swashplate trunion. Control lever movement changes thedisplacement and flow direction of the pump by increasing or decreasing the swashplate angle.
The control input shaft is on the right hand side of the pump. Contact your Danfoss representative foravailability of left side control input.
Features and benefits•••

Simple, low cost design
Pump output is maintained regardless of load.
Pump will return to neutral if control input is removed (if equipped with optional neutral returnmechanism)

Control handle requirements
Maximum allowable trunnion torque is 79.1 N•m [700 lbf•in]. Minimum available centering moment is 5.7
N•m [50 lbf•in]. The actual value will vary due to the influence of pump operating conditions. Maximum
swashplate angle is ±18°. For mating dimensions, see Installation drawings on page 29.
Input shafts
Shaft data
Code Description

Maximum torqueN•m [lbf•in]A

226 [2000]

13 tooth spline
16/32 pitch(ANSI B92.1 1966 - Class 6e)

Drawing41.2 ± 0.8[1.622 ± 0.03]
15.2 ± 0.09
[0.5984 ± 0.0035]

20.637 [0.8125] pitch diameter
30° pressure angle
13 teeth
16/32 pitch
7.9 ± 0.8
fillet root side fit[0.31 ± 0.03]

B

15 tooth spline
16/32 pitch(ANSI B92.1 1966 - Class 6e)362 [3200]

41.2 ± 0.8[1.62 ± 0.03]
18.5 ± 0.09
[0.7283 ± 0.0035]

20.622 [0.8119] pitch diameter
30° pressure angle
15 teeth
16/32 pith
7.9 ± 0.8
fillet root side fit[0.31 ± 0.03]

26 | © Danfoss | April 2021

P106283

P106284

BC152886483590en-000301

Technical Information
LPV Axial Piston Pumps
Features and options
Shaft data (continued)
Code Description

Maximum torqueN•m [lbf•in]C

241 [2133]

20 tooth spline
24/48 pitch(ANSI B92.1 1966 - Class 6e)

Drawing
48.6 Max.
[1.91]
22.48 ± 0.5[0.89 ± 0.02]

21.166 [0.8333] pitch diameter
30° pressure angle
20 teeth
24/48 pitch
fillet root side fit

DStraight key
22.2 mm [0874 in](ANSI B92.1 1966 - Class 6e)

6.9 Max.
[0.27]P108847

226 [2000]
41.9 [1.65] Max.
6.9 [0.27]
Max.

18.58 ± 0.1[0.731 ± 0.005]+0.0180
]
0

+0.03
0

19 +0.05
0[0.75022.225[0.875 +0.001]
0+0.05
6.35 0+0.002]0[0.2508.175 ± 0.325[0.322 ± 0.013]

See Input shaft torque rating and spline lubrication on page 13 for an explanation of maximum torque.

Auxiliary mounting pads
SAE-A Auxiliary mounting
Dimensions
44.73 [1.761]
20.1 [0.792]

31.8[1.25]

1.96[0.08]

Ø101.65 [4.002]

Ø107.82 [4.245]

16.47[0.65]
88.62[3.49]© Danfoss | April 2021

15 [0.590]
minimum toothengagement
82.6[3.25]

82.6[3.25]

O-ring seal required
82.22 [3.237] I.D. x
2.62 [0.103] dia. cross section

O-ring seal required
82.22 [3.237] I.D. x
2.62 [0.103] dia. cross section
13 tooth coupling
ANSI B92.1B Class 7E[1.25]
19.77[0.78]
88.62[3.49]

13.5 [0.531]
minimum toothengagement

1.96 [0.77]

1.96[0.08]* 31.89 tooth coupling
SAE-A 9T

11 tooth coupling
SAE-A SPCL 11T* dimension is short of standard dimension

P106322

BC152886483590en-000301 | 27

Technical Information
LPV Axial Piston Pumps
Features and options
Dimensions in mm [in]The auxiliary pad operates under case pressure. Use an O-ring to seal the auxiliary pump mounting flange
to the pad.
The combination of auxiliary shaft torque and main pump torque must not exceed the maximum pump
input shaft rating. The table in Input shafts on page 26, gives input shaft torque ratings for each frame
size.
Mating pump specifications
D

Mountingflange (ref.)Undercut
splineSled-runnerspline

mm
[in]

E

max .

max.

A Ø 82.55[3.250]B

R 0.8 [0.03] max.
CouplingC

Recommended
cutter clearance
2.3 [0.090]

max.
max.

P101079

Dimensions
Measurement

SAE A (9T) or (11T)
units mm [in]

A

82.55
[3.250]B

6.35[0.250]C

17.78[0.700]D*

31.75[1.250]E

17.78[0.700]* The 11 tooth auxiliary pad option requires a special short shaft on the mating pump due to reduced
clearance to the LPV pump shaft.

28 | © Danfoss | April 2021

BC152886483590en-000301

Technical Information
LPV Axial Piston Pumps
Installation drawings
LPV Installation drawings

1 1/16 -12
SAE straight thread
O-ring boss
case drain

182.9[7.20]
128.8[5.07]

7/8 -14
SAE straight thread
O-ring boss
charge inlet
Charge pressure
relief valve

39.2[1.54]

92.1[3.63]
F1
18°
Max.
Displ.

246.3[9.70]
R1
18°
Max.
Displ.

HPRV valve

82.6[3.25]

125[4.92]
2X 3/8 -16
UNC-2B THD

94.3[3.71]
2X 58.9[2.32]

111.1[4.37]

72.7[2.86]

Loop flushing valve
location
2X 3/8 -16 x 1
UNC THD(hole is 20 mm deep)
Trunion

128.8[5.07]

182.9[7.20]
1 1/16 -12
SAE straight thread
O-ring boss
system port A45°

2X 35.1[1.38]

15.82 [0.623](2) Places

19.84 dia.
[0.781]1 1/16 -12
SAE straight thread
O-ring boss
case drain (alternate)© Danfoss | April 2021

1 1/16 -12
SAE straight thread
O-ring boss
system port B

CONTROL TRUNNION DETAIL

P106281

BC152886483590en-000301 | 29

Technical Information
LPV Axial Piston Pumps
Installation drawings
Shaft rotation
CW
Handle angle
Port flow

F1

CCW
R1

R1

F1

A

out

in

in

out

B

in

out

out

in

HPRV valve
2X 73[2.87]CCW

CW

Bypass valve
Loop flushing valve+0.25
2X Ø14.3-0.12[0.563 +0.010-0.005 ]P106281

LPV Schematic
Charge pressure
inlet

L2
Port APort B

L1

30 | © Danfoss | April 2021

P106270

BC152886483590en-000301

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Local address:

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www.hydro-gear.com
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www.daikin-sauer-danfoss.com

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2800 East 13th Street
Ames, IA 50010, USA
Phone: +1 515 239 6000

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Phone: +49 4321 871 0

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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 | April 2021

BC152886483590en-000301