MAKING MODERN LIVING POSSIBLE
Service Manual
Closed Circuit Axial Piston
K and L Frame Variable Motors,
SAE Mount
powersolutions.danfoss.com
Service Manual K and L Frame Variable Motors, SAE Mount
Revision history Table of revisions
Date Changed Rev
November 2014 Danfoss layout DA
May 2013 Add Anti-Cavitation Valve CB
October 2010 Minor edits, new back page CA
November 2006 Added loop flushing valve B
July 2004 First edition A
2 520L0629 • Rev DA • November 2014
Service Manual
Contents
Introduction
Technical specifications
Features
Pressure measurements
Initial start-up procedures
Fluid and filter maintenance
Troubleshooting
Minor repair
K and L Frame Variable Motors, SAE Mount
Overview..............................................................................................................................................................................................4
Safety precautions............................................................................................................................................................................4
Unintended machine movement..........................................................................................................................................4
Flammable cleaning solvents.................................................................................................................................................4
Fluid under pressure..................................................................................................................................................................4
Personal safety............................................................................................................................................................................. 4
Symbols used in Danfoss literature............................................................................................................................................5
Design...................................................................................................................................................................................................5
The System circuit............................................................................................................................................................................ 6
Overview..............................................................................................................................................................................................7
Features and options...................................................................................................................................................................... 7
Specifications.....................................................................................................................................................................................7
Operating parameters.................................................................................................................................................................... 7
Fluid specifications.......................................................................................................................................................................... 7
Displacement limiter.......................................................................................................................................................................9
Output shafts..................................................................................................................................................................................... 9
Controls................................................................................................................................................................................................9
Control orificing...........................................................................................................................................................................9
Required tools.................................................................................................................................................................................10
Port locations and gauge installation.....................................................................................................................................10
General ..............................................................................................................................................................................................12
Start-up procedure........................................................................................................................................................................12
Recommendations........................................................................................................................................................................ 13
Excessive noise and / or vibration............................................................................................................................................14
System operating hot...................................................................................................................................................................14
Won’t shift or slow to shift..........................................................................................................................................................14
Shaft seal replacement.................................................................................................................................................................15
Remove the shaft seal.............................................................................................................................................................15
Inspect the components........................................................................................................................................................15
Install the new shaft seal........................................................................................................................................................15
Speed sensor replacement.........................................................................................................................................................15
Remove the speed sensor..................................................................................................................................................... 15
Install the new speed sensor................................................................................................................................................ 16
Speed sensor adjustment........................................................................................................................................................... 17
Adjustment and troubleshooting.......................................................................................................................................17
Loop flushing valve.......................................................................................................................................................................17
Remove the loop flushing valve..........................................................................................................................................17
Inspect the components........................................................................................................................................................18
Install the loop flushing valve.............................................................................................................................................. 18
Anti-Cavitation Valve....................................................................................................................................................................19
Remove the anti-cavitation valve.......................................................................................................................................19
Inspect the components........................................................................................................................................................19
Install the anti-cavitation valve............................................................................................................................................19
520L0629 • Rev DA • November 2014 3
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Service Manual
Introduction
Overview
Safety precautions
K and L Frame Variable Motors, SAE Mount
This manual includes information for the installation, maintenance, and minor repair of the K and L Frame
SAE Mount Variable Motors. The manual includes a description of the units and their individual
components, troubleshooting information, and minor repair procedures. Performing installation,
maintenance, and minor repair of K and L Frame Variable Motors according to the procedures in this
manual will not affect your warranty.
Performing minor repairs requires the unit to be removed from the vehicle/machine. Thoroughly clean
the unit before beginning maintenance, or repair activities. Since dirt and contamination are the greatest
enemies of any type of hydraulic equipment, follow cleanliness requirements strictly. This is especially
important when changing the system filter and when removing hoses or plumbing.
A worldwide network of Danfoss Authorized Service Centers (ASCs) is available for major repairs. Major
repairs require the removal of the unit’s endcap, which voids the warranty unless done by an ASC.
Danfoss ASCs are trained by the factory and certified on a regular basis. You can locate your nearest ASC
using the distributor locator at www.danfoss.com.
Always consider safety precautions before beginning a service procedure. Protect yourself and others
from injury. Take the following general precautions whenever servicing a hydraulic system.
Unintended machine movement
Warning
Unintended movement of the machine or mechanism may cause injury to the technician or bystanders.
To protect against unintended movement, secure the machine or disable / disconnect the mechanism
while servicing.
Flammable cleaning solvents
Warning
Some cleaning solvents are flammable. To avoid possible fire, do not use cleaning solvents in an area
where a source of ignition may be present.
Fluid under pressure
Warning
Escaping hydraulic fluid under pressure can have sufficient force to penetrate your skin causing serious
injury and/or infection. This fluid may also be hot enough to cause burns. Use caution when dealing with
hydraulic fluid under pressure. Relieve pressure in the system before removing hoses, fittings, gauges, or
components. Never use your hand or any other body part to check for leaks in a pressurized line. Seek
medical attention immediately if you are cut by hydraulic fluid.
Personal safety
Warning
Protect yourself from injury. Use proper safety equipment, including safety glasses, at all times.
4 520L0629 • Rev DA • November 2014
Service Manual
K and L Frame Variable Motors, SAE Mount
Introduction
Symbols used in Danfoss literature
WARNING may result in injury Tip, helpful suggestion
CAUTION may result in damage to product or
property
Reusable part Apply grease / petroleum jelly
Non-reusable part, use a new part Apply locking compound
Non-removable item Inspect for wear or damage
Option - either part may exist Clean area or part
Superseded - parts are not interchangeable Be careful not to scratch or damage
Measurement required Note correct orientation
Flatness specification Mark orientation for reinstallation
Parallelism specification Torque specification
External hex head Press in - press fit
Internal hex head Pull out with tool – press fit
Torx head Cover splines with installation sleeve
Lubricate with hydraulic fluid
Design
O-ring boss port Pressure measurement/gauge location or
specification
The symbols above appear in the illustrations and text of this manual. They are intended to communicate
helpful information at the point where it is most useful to the reader. In most instances, the appearance
of the symbol itself denotes its meaning. The legend above defines each symbol and explains its purpose.
K and L Frame Variable Motors (KV/LV) are low to medium power, two-position axial piston motors
incorporating an integral servo piston. They are designed for operation in both open and closed circuit
applications. KV/LV motors have an SAE-B, two bolt mounting configuration. The standard control is a
direct acting single line hydraulic control. The integral servo piston controls motor displacement.
The motors are spring biased to maximum displacement and hydraulically shifted to minimum
displacement. Minimum and maximum displacement can be set with fixed internal stops. The large
diameter servo piston allows smooth acceleration and deceleration with relatively large circuit orificing.
The motors are ideally configured for installations requiring compact packaging and optimized
plumbing, such as wheel ends. One face of the motor contains all hydraulic porting. Two standard
porting configurations are available: twin radial (side) or axial (end) O-ring boss main ports.
520L0629 • Rev DA • November 2014 5
Bias spring
Servo piston
Swashplate
Output
shaft
Piston
Slipper
Cylinder
block
Endcap
Shaft
seal
Bearing
Minimum
angle
stop
P101109
Valve plate
Reservior
Check valves
w/high pressure
relief valves and
bypass plunger
Charge
pump
Cylinder
block
assembly
Cylinder
block
assembly
Pump
swashplate
Motor
swashplate
Output
shaft
Input
shaft
Servo
piston
Displacement
control spool
Filter
High loop pressure
Case pressure
Charge/low loop pressure
Control pressure
Inlet pressure
Charge relief valve
Motor
displacement
control valve
Pump control handle
and feedback linkage
Motor
servo
piston
Displacement
limiter
P101 335E
Service Manual
Introduction
The System circuit
System circuit diagram
K and L Frame Variable Motors, SAE Mount
Cross section view
The circuit below shows the KV/LV motor in a simple closed-loop hydrostatic propel application. The
motor is driven by a Series 42 medium power axial piston pump with manual displacement control. The
motor shown uses a single line hydraulic displacement control. Control pressure applied through an
external control valve shifts the motor to minimum displacement; spring force returns the motor to
maximum displacement in the absence of control input.
6 520L0629 • Rev DA • November 2014
Service Manual
K and L Frame Variable Motors, SAE Mount
Technical specifications
Overview
Specifications and operating parameters for KV/LV motors are given here for reference.
Features and options
Mount SAE-B (LV/KV) Cartridge (LC/KC)
Motor type Inline, axial piston, positive displacement, two-speed variable motors
Displacement L: 25, 30, or 35 cm3 [1.50, 1.83, or 2.14 in3] K: 38 or 45 cm3 [2.32 or 2.75 in3]
Rotation Bidirectional
Installation position Discretionary: Housing must always be filled with hydraulic fluid
Porting SAE O-ring boss, axial or twin radial SAE O-ring boss, twin radial
Output shafts Splined 13 or 15 tooth 16/32 pitch, 0.875 in. straight
keyed, and 1:8 taper
Control options Single or dual line hydraulic control Single line hydraulic control
Displacement limiter Fixed maximum and minimum displacement limiters available
Speed sensor Available on L Frame SAE-B motors, in development* on K frame and cartridge motors
Loop Flushing Valve Available
Splined 13 or 15 tooth 16/32 pitch
Specifications
Parameter Unit L25 L30 L35 K38 K45
Displacement (maximum) cm3 [in3] 25 [1.50] 30 [1.83] 35 [2.14] 38 [2.32] 45 [2.75]
Weight (cartridge and SAE-B) kg [lb] 15.4 [34]
Mass moment of inertia of rotating
components
Theoretical torque N•m/bar
[lbf•in/1000psi]
kg•m
[slug•ft2]
2
0.001666
[0.001229]
0.40
[244]
0.001582
[0.001167]
0.48
[293]
0.001530
[0.001128]
0.56
[347]
0.002326
[0.001716]
0.60
[366]
0.002286
[0.001687]
0.72
[439]
Operating parameters
Parameter Unit L25 L30 L35 K38 K45
System pressure continuous bar [psi] 210 [3045] 175 [2540] 140 [2030] 210 [3045] 175 [2540]
maximum 415 [6020] 350 [5075] 300 [4350] 415 [6020] 350 [5075]
Speed limit
(at max. disp)
Speed limit
(at min. disp)
Case pressure continuous bar [psi] 2 [29]
continuous min-1 (rpm) 3400 3500 3600 3600 3500
maximum 3950 4150 4300 4000 3900
continuous 4400 4450 4500 4650 4500
maximum 5000 5150 5300 5200 5050
maximum 6 [87]
Fluid specifications
Ratings and data are based on operation with premium petroleum-based hydraulic fluids containing
oxidation, rust, and foam inhibitors.
520L0629 • Rev DA • November 2014 7
Service Manual K and L Frame Variable Motors, SAE Mount
Technical specifications
Parameter Unit Minimum Continuous Maximum
Viscosity mm2/sec (cSt)
[SUS]
Temperature °C [°F] -40 [-40] 82 [180] 104 [220]
Cleanliness ISO 4406 Class 18/13 or better
Filtration efficiency suction filtration β
charge filtration β
7
[47]
12-60
[70-278]
=75 (β10≥1.5)
35-44
=75 (β10≥10)
15-20
1600
[7500]
8 520L0629 • Rev DA • November 2014
Minimum angle stop
P104 242E
Service Manual
Features
Displacement limiter
Output shafts
K and L Frame Variable Motors, SAE Mount
KV/LV motors are available with a minimum angle stop. This displacement limiter is not adjustable.
Displacement limiter
KV/LV motors have one of the following shafts. For dimensions, refer to L and K Frame Variable Motors
Technical Information, 520L0627.
13 tooth spline
•
16/32 pitch
ANSI B92.1 1970-Class 5
Ø 22.225 mm [.875 in]
•
Straight keyed
Ø 22.225 mm [.875 in]
•
1:5 Taper
15 tooth spline
•
16/32 pitch
ANSI B92.1 1970-Class 5
Controls
KV/LV motors are designed to operate in two positions: maximum and minimum displacement. The
motors are spring biased to maximum displacement and hydraulically shifted to minimum displacement.
KV/LV motors can operate with a single line or dual line control.
Control input pressure limits
Single line control 14 to 69 bar
[200 to 1000 psi]
Dual line control 14 to 35 bar
[200 to 500 psi]
Pressure applied at port X1 shifts the motor to minimum displacement. Pressure at X2 can assist the shift
to maximum displacement. Refer to the table above for control input pressure range.
Control orificing
Motors with single line controls can have optional, internal supply and drain orifices installed to regulate
control response times.
Motors with dual line controls rely on external valving and orificing to regulate shift speeds.
520L0629 • Rev DA • November 2014 9
System pressure port A
Control port X2
System pressure port B
Control port X1
Case drain port L1
Case drain port L2
P104 240E
Service Manual
K and L Frame Variable Motors, SAE Mount
Pressure measurements
Required tools
The service procedures described in this manual can be performed using common mechanic’s hand
tools. Special tools, if required are shown. Calibrate pressure gauges frequently to ensure accuracy. Use
snubbers to protect gauges.
Port locations and gauge installation
For economical reasons, the KV/LV motors do not contain any designated gauge installation ports. All
pressure measurements can be obtained by installing tee fittings to the connections at the locations
listed in the table / drawing below. Recommended gauge sizes are also listed.
Port information
Port identifier Size Pressure obtained Gauge size, bar [psi]
X1 [0.5625]-18 UNF-2B Control signal 600 [10 000]
X2 [0.5625]-18 UNF-2B Control signal 600 [10 000]
L1 [0.750]-16 UNF-2B Case drain 10 [100]
L2 [0.750]-16 UNF-2B Case drain 10 [100]
A [1.0625]-12 UNF-2B System pressure 600 [10 000]
B [1.0625]-12 UNF-2B System pressure 600 [10 000]
Twin radial port locations
10 520L0629 • Rev DA • November 2014
Control port X1
System pressure port B
System pressure port A
Case drain port L2
P104 242E
Service Manual K and L Frame Variable Motors, SAE Mount
Pressure measurements
Axial port locations
520L0629 • Rev DA • November 2014 11
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Service Manual
Initial start-up procedures
General
Start-up procedure
K and L Frame Variable Motors, SAE Mount
Follow this procedure when starting-up a new motor installation or when restarting an installation in
which the motor has been removed.
Warning
Unintended movement of the machine or mechanism may cause injury to the technician or bystanders.
To protect against unintended movement, secure the machine or disable / disconnect the mechanism
while servicing.
Prior to installing the motor, inspect for damage incurred during shipping. Make certain all system
components (reservoir, hoses, valves, fittings, heat exchanger, etc.) are clean prior to filling with fluid.
1. Fill the reservoir with recommended hydraulic fluid. Always filter fluid through a 10 micron filter
when pouring into the reservoir. Never reuse hydraulic fluid.
2. Fill the inlet line leading from the pump to the reservoir. Check the inlet line for properly tightened
fittings and be certain it is free of restrictions and air leaks.
3. Fill the pump and motor housing with clean hydraulic fluid. Pour filtered oil directly into the upper
most case drain port.
4. To ensure the pump and motor stay filled with oil, install case drain lines into the upper most case
drain ports.
5. Install a 0 to 35 bar [0 to 500 psi] gauge in the charge pressure gauge port of the pump to monitor
system pressure during start up.
Follow recommendations in the vehicle / machine operator’s manual for prime mover start up
procedures.
6. While watching the pressure gauge, jog the prime mover or run at the lowest possible speed until
system pressure builds to normal levels (minimum 11 bar [160 psi]). Once system pressure is
established, increase to full operating speed. If system pressure is not maintained, shut down the
prime mover, determine cause, and take corrective action. Refer to Troubleshooting, page 13.
7. Operate the hydraulic system for at least fifteen minutes under light load conditions.
8. Check and adjust control settings as necessary after installation.
9. Shut down the prime mover and remove the pressure gauge. Replace plug at the charge pressure
gauge port.
10. Check the fluid level in the reservoir; add clean filtered fluid if necessary.
The motor is now ready for operation.
12 520L0629 • Rev DA • November 2014
Service Manual
Fluid and filter maintenance
Recommendations
K and L Frame Variable Motors, SAE Mount
To ensure optimum life of KV/LV products, perform regular maintenance of the fluid and filter.
Contaminated fluid is the main cause of unit failure. Take care to maintain fluid cleanliness when
servicing.
Check the reservoir daily for proper fluid level, the presence of water, and rancid fluid odor. Fluid
contaminated by water may appear cloudy or milky or free water may settle in the bottom of the
reservoir. Rancid odor indicates the fluid has been exposed to excessive heat. Change the fluid
immediately if these conditions occur. Correct the problem immediately.
Change the fluid and filter per the vehicle / machine manufacturer’s recommendations or at these
intervals:
Fluid and filter change interval
Reservoir type Max oil change interval
Sealed 2000 hours
Breather 500 hours
Change the fluid more frequently if it becomes contaminated with foreign matter (dirt, water, grease,
etc.) or if the fluid is subjected to temperature levels greater that the recommended maximum.
Dispose of used hydraulic fluid properly. Never reuse hydraulic fluid.
Change filters whenever the fluid is changed or when the filter indicator shows that it is necessary to
change the filter. Replace all fluid lost during filter change.
520L0629 • Rev DA • November 2014 13
Service Manual K and L Frame Variable Motors, SAE Mount
Troubleshooting
Excessive noise and / or vibration
Item Description Action
Check oil level in reservoir
and oil supply to the motor.
Check for air in the system. Air trapped within the system lines, or the motor itself,
Inspect the output shaft
couplings.
Inspect the output shaft
alignment.
Hydraulic oil viscosity above
limits.
System operating hot
Item Description Action
Check oil level in reservoir
and oil supply to the pump.
Inspect the heat exchanger,
(if so equipped).
Check the system relief
valves.
Insufficient hydraulic fluid could lead to cavitation that
would cause system noise.
could result in cavitation that would cause system noise.
A loose or incorrect shaft coupling will produce vibrations
that could result in system noise.
Misaligned shafts create excessive frictional vibration that
could result in system noise.
Viscosity above acceptable limits will result in cavitation
that would lead to system noise.
Insufficient amount of hydraulic fluid will not meet the
cooling demands of the system.
If the heat exchanger fails, or becomes obstructed, it may
not meet the cooling demands of the system.
If a system relief valve becomes unseated for an extended
period of time or fails for any other reason, the system
could become overheated.
Fill the reservoir to the proper level and ensure that oil
supply to the motor is adequate and the lines are
unobstructed.
Ensure that all of the system lines and components are
purged of air.
Ensure that the correct coupling is used and that it fits
properly onto the shaft.
Ensure that the shafts are properly aligned.
Replace hydraulic oil with appropriate fluid for operating
conditions. Refer to publication 5200L0463 for information
on fluid selection.
Fill the reservoir to the proper level.
Ensure that heat exchanger is receiving adequate air flow
and that the heat exchanger is in good operating
condition. Repair or replace as necessary.
Repair or replace any malfunctioning relief valves as
applicable and verify that the loads on the machine are not
excessive.
Won’t shift or slow to shift
Item Description Action
Check the signal line to the
servo control port.
Check that the correct
supply and drain orifices are
properly installed, and are
not obstructed.
Obstructed or restricted flow through the servo control
signal lines could result in slow shift or no shift conditions
within the motor.
Supply and drain orifices determine the shift rate of the
motor. The smaller the orifice, the longer the time it takes
to shift the motor. Obstruction will also increase shift times.
Ensure that the signal lines are not obstructed or restricted
and that signal pressure is adequate to shift the motor.
Ensure that the proper control orifices are installed in the
motor and verify that they are not obstructed. Clean or
replace as necessary.
14 520L0629 • Rev DA • November 2014
B005
M004
dM003
i
b
p
E101 061
Service Manual
Minor repair
Shaft seal replacement
K and L Frame Variable Motors, SAE Mount
Remove the shaft seal
1. Remove the snap ring (B005) retaining the shaft seal and support washer.
2. Remove the support washer (M004).
3. Carefully pry out the shaft seal (M003).
To avoid damaging the shaft during removal, install a large sheet metal screw into the chuck of a slide
hammer. Drive the screw into the seal surface and use the slide hammer to pull the seal.
4. Discard the seal.
Replacing the shaft seal
Speed sensor replacement
Inspect the components
Inspect the new seal, the motor housing seal bore, and the sealing area on the shaft for rust, wear, and
contamination. Polish the shaft and clean the housing if necessary.
Install the new shaft seal
1. Cover the shaft splines with an installation sleeve to protect the shaft seal during installation.
2. Install a new shaft seal with the cupped side facing the motor. Press seal into housing until it bottoms
out. Press evenly to avoid binding and damaging the seal.
3. Install seal support washer.
4. Install snap ring.
5. Remove the installation sleeve.
Remove the speed sensor
1. Disconnect the speed sensor electrical connector.
2. Using an 11/16 wrench, loosen the locknut.
3. Using a 1/2 inch wrench, remove the speed sensor and o-ring from the motor.
520L0629 • Rev DA • November 2014 15
P104 359E
O-ring
Lock nut
Service Manual
Minor repair
K and L Frame Variable Motors, SAE Mount
Replacing the speed sensor
Install the new speed sensor
1. Turn speed sensor with o-ring in (CW) by hand until bottom end gently touches the speed ring.
2. Back out speed sensor (CCW) 1/4 turn. Continue backing out until the flats are 22° either side of the
motor shaft center line (20° to 30° is acceptable). Do not back out more than 3/4 turn from touching
bottom.
3. Using a 1/2 inch wrench to hold the speed sensor, torque the lock nut to 13 N•m [10 lbf•ft] with an
11/16 inch wrench.
4. Plug in electrical connection and start machine to test for proper operation.
16 520L0629 • Rev DA • November 2014
Service Manual
Minor repair
K and L Frame Variable Motors, SAE Mount
Installing the speed sensor
Speed sensor adjustment
Loop flushing valve
Adjustment and troubleshooting
1. Wire configuration
Red=Power
White=Speed signal
Black=Ground (common)
Green=Direction
2. Speed signal
Check for speed output using a Volt Ohm Meter (VOM). Place VOM across the ground and speed pins
or terminals, (Black=Ground, White=Speed Signal) and set VOM to the DC Volt scale and low range.
To check for an output, turn pump or motor very slowly by hand or check output just as the prime
mover is coming to a stop. Note a voltage pulse at meter. It will likely be difficult to read exact, simply
note a pulse (approximately 60 pulses per rev). If there is no indication of a pulse, repeat installation
steps and recheck.
3. Directional signal
Check for a direction signal change using a VOM. Use the same VOM setup as in the above speed
signal check. Turn the motor slowly and note a polarity change (±) on the VOM display as you change
the motor direction.
Remove the loop flushing valve
1. Using a 11/16 in internal hex wrench remove plug (E020) and (E010).
2. Using a 1/4 in hex wrench remove plug (E042).
3. Remove O-rings (E020B, E042A, and E010B).
520L0629 • Rev DA • November 2014 17
K001
E010
E010B
E010C
E010D
E001
E020
E020B
E020C
E020D
E030
E042A
E042
E041
E040
37 N·m
[27 lbf·ft]
11/16 in
37 N·m
[27 lbf·ft]
11/16 in
27 N·m
[20 lbf·ft]
5/8 in
P106 512E
Service Manual
Minor repair
K and L Frame Variable Motors, SAE Mount
4. Using pliers, remove centering springs (E041, E020C, and E010C).
5. Remove spring retaining washers (E020D and E010D).
6. Remove shift spool (E030).
7. Remove orifice poppet (E040).
Loop flushing valve
Inspect the components
Inspect new O-rings and the sealing area for rust, wear, or contamination. Also check springs and poppet
for wear.
Install the loop flushing valve
1. Install orifice poppet (E040).
2. Install shift spool (E030).
3. Install spring retaining washers onto springs (E020D and E010D).
4. Carefully install centering springs (E041, E020C, and E010C).
18 520L0629 • Rev DA • November 2014
5. Install new O-rings (E010B, E020B, and E042A).
6. Using a 1/4 in hex wrench torque plug (E042) to X N•m [X ft•lbs].
7. Using a 11/16 in internal hex, torque plugs (E010 and E020) to X N•m [X lbf•ft].
P108 714E
Counter-Clockwise rotation shown.
Anti-cavitation valve is installed
in port A.
E020
E020A
E011
E061
E012
E063
Service Manual
Minor repair
Anti-Cavitation Valve
K and L Frame Variable Motors, SAE Mount
Remove the anti-cavitation valve
The anti-cavitation valve is installed into the high pressure port. The high pressure port depends on
motor rotation. If rotation is counterclockwise, the high pressure port is A. If rotation is clockwise, the
high pressure port is B.
1. Using a 5/16 in internal hex wrench remove valve plug (E061). Remove and discard O-ring (E063).
2. Remove spring (E012) and relief valve (E011) from end cap.
3. Using a 5/16 in internal hex wrench remove plug (E020). Remove and discard O-ring (E020A).
Anti-cavitation valve
Inspect the components
Inspect sealing area for rust, wear, or contamination. Check spring (E012) and relief valve (E011) for wear
and damage. Relief valve (E011) is non-serviceable, replace as complete unit if damaged.
Install the anti-cavitation valve
1. Lubricate and insert relief valve (E011) and spring (E012) in original location.
2. Lubricate and install new O-ring (E063) on valve plug (E061).
3. If needed lubricate and install new O-ring (E020A) on plug (E020).
4. Using a 5/16 inch internal hex wrench to install valve plug (E061) into port with relief valve (E011).
Torque to 80 N•m [59 lbf•ft].
5. If needed using a 5/16 inch internal hex wrench to install plug (E020) into port without relief valve
(E011). Torque to 80 N•m [59 lbf•ft].
520L0629 • Rev DA • November 2014 19
Danfoss
Power Solutions GmbH & Co. OHG
Krokamp 35
D-24539 Neumünster, Germany
Phone: +49 4321 871 0
Danfoss
Power Solutions ApS
Nordborgvej 81
DK-6430 Nordborg, Denmark
Phone: +45 7488 2222
Danfoss
Power Solutions (US) Company
2800 East 13th Street
Ames, IA 50010, USA
Phone: +1 515 239 6000
Danfoss
Power Solutions
(Shanghai) Co., Ltd.
Building #22, No. 1000 Jin Hai Rd
Jin Qiao, Pudong New District
Shanghai, China 201206
Phone: +86 21 3418 5200
Products we offer:
Comatrol
www.comatrol.com
Schwarzmüller-Inverter
www.schwarzmuellerinverter.com
Turolla
www.turollaocg.com
Valmova
www.valmova.com
Hydro-Gear
www.hydro-gear.com
Daikin-Sauer-Danfoss
www.daikin-sauer-danfoss.com
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We help OEMs around the world speed up system development, reduce costs and bring
vehicles to market faster.
Danfoss – Your Strongest Partner in Mobile Hydraulics.
Go to www.powersolutions.danfoss.com for further product information.
Wherever off-highway vehicles are at work, so is Danfoss. We offer expert worldwide support
for our customers, ensuring the best possible solutions for outstanding performance. And
with an extensive network of Global Service Partners, we also provide comprehensive global
service for all of our components.
Please contact the Danfoss Power Solution representative nearest you.
Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to
products already on order provided that such alterations can be made without changes being necessary in specifications already agreed.
All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
520L0629 • Rev DA • November 2014 www.danfoss.com
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Danfoss A/S, 2014
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