PDF Service Manual Danfoss Axial Piston Pumps Motors and Transmissions - 4 MB
This comprehensive service manual covers the repair and maintenance of Danfoss Axial Piston Pumps, Motors, and Transmissions.
It is an essential resource for hydraulic technicians, providing in-depth procedures, technical specifications, and troubleshooting guides.
Proper servicing according to this manual will ensure the reliability and longevity of your Danfoss hydraulic components.
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--- Page 1 ---
CONTENTS
Series 40
M25 - Axial Piston
Pumps, Motors, and
Transmissions
Service and Repair Manual
--- Page 3 ---
Axial Piston Pumps, Motors, and Transmissions Series 40 - M25
Notes
20 - 2
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Axial Piston Pumps, Motors, and Transmissions Series 40 - M25
Notes
40 - 4
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Axial Piston Pumps, Motors, and Transmissions Series 40 - M25
Notes
40 - 14
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Axial Piston Pumps, Motors, and Transmissions Series 40 - M25
Minor Repair and Replacement - "U" Style Transmission (Continued)
Heat Exchanger Bypass Valve
Remove the heat exchanger bypass valve plug with
a 7/8" hex wrench.
Remove the spring and poppet from the center sec-
tion.
Do not interchange parts with another valve.
90250042 Earlier production transmissions use a spring in the
Fig. 50-33 - Remove Heat Exchanger heat exchanger bypass valve which is identified by a
Bypass Valve Plug (U) yellow dye mark and requires a force of approxi-
mately 22 N (5.5 lbsf) to compress it to a length of 45.7
mm (1.28 inches).
Later production transmissions use a spring in the
heat exchanger bypass valve which is identified by a
red dye mark and requires a force of approximately
10 N (2.2 lbsf) to compress it to a length of 1.28 inches
(45.7 mm).
Inspect the poppet and mating seat in the end cap for
damage or foreign material.
90250014 Reinstall the poppet, spring, and plug (with O-ring)
Fig. 50-34 - Heat Exchanger Bypass Valve into the center section. Torque the plug to 41 to 95
(U) Nm (30 to 70 lbsf•ft).
Filter Bypass Valve
Remove the filter bypass valve hex plug with a 7/8"
wrench.
Remove the spring and poppet from the center sec-
tion.
Do not interchange parts with another valve. The
spring used in the filter bypass valve is identified by
90250043 a red dye mark, and requires a force of approximately
Fig. 50-35 - Remove Filter Bypass Valve 10 N (2.2 lbsf) to compress it to a length of 45.7 mm
Plug (U) (1.28 inches). Inspect the poppet and mating seat in
the end cap for damage or foreign material.
Reinstall the poppet, spring, and plug (with O-ring)
into the center section. Torque the plug to 41 to 95
Nm (30 to 70 lbsf•ft).
90250015
Fig. 50-36 - Filter Bypass Valve (U)
50 - 10
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Axial Piston Pumps, Motors, and Transmissions Series 40 - M25
Major Repair - Variable Pump (Continued)
Using an arbor press, press a new seal into the
trunnion seal cover. Be careful not to damage the
seal.
For units with tapered roller type swashplate bear-
ings, install the the trunnion shims into the housing
next to the swashplate bearing cups, and retain with
petroleum jelly. Locate the shims so that there is no
more than 0.20 mm (0.008 in.) difference in shim
thickness from one side of the swashplate to the
40250023 40250070
other. Install the trunnion bearing spacers.
Fig. 61-20 - Trunnion Fig. 61-21 - Torque
Cover Components Trunnion Cover Install the O-rings and trunnion covers, as described
(Tapered Roller) Screws in the “Minor Repair” section of the Service Manual.
Install new hex head screws and torque to 15 to 20
Nm (11 to 15 ft.lbsf.).
NOTE: When units with tapered roller type swash-
plate bearings are properly assembled, a
torque of 0.56 to 2.26 Nm (5 to 20 lbsf•in) will
be required to rotate the swashplate.
Using caution to not damage the sealing surface,
press the ball bearing onto the drive shaft. Install the
40250062 40250061 bearing retaining ring onto the shaft.
Fig. 61-22 - Install Fig. 61-23 - Install
Shaft Bearing Shaft and Bearing Install the drive shaft and bearing into the housing.
Retaining Ring into Housing
Install the input shaft seal, seal cover, and O-ring, as
described in the “Minor Repair” section of the Service
Manual. Install the retaining ring.
Coat the thrust plate with petroleum jelly and install
onto the swashplate. The thrust plate is reversible.
40250071 40250059
Fig. 61-24 - Install Fig. 61-25 - Install
Shaft Seal Cover Thrust Plate
Assemble the piston assemblies into the slipper
guide. Lubricate the pistons and cylinder block
bores. Install the assembled guide and pistons into
the cylinder block by inserting the piston assemblies
into the cylinder block bores. The pistons and bores
are not selectively fitted, therefore no specific piston
and bore orientation is required.
Lay the pump housing on its side and install the
cylinder block kit into the housing.
40250072 40250057
Fig. 61-26 - Install Fig. 61-27 - Install
Piston Assemblies Cylinder Block Kit
into Cylinder Block
61 - 6
--- Page 8 ---
Axial Piston Pumps, Motors, and Transmissions Series 40 - M25
Major Repair - Fixed Motor (Continued)
Disassembly Procedures for Fixed Motor
Prior to performing Major Repairs, remove the exter- Lay the motor on its side and remove the cylinder
nal components as described in the Minor Repair block assembly (item B22) from the housing.
section.
Remove the slipper guide (item B36) and the piston
Place the motor on a work surface with the end cap assemblies (item B32) from the cylinder block.
up. Remove the four (4) screws (item B41) that retain
the end cap (item E01) to the housing (item G01 or Using an O-ring pick or wire, remove the thrust plate
item G02). (item B21) from the housing.
Remove the end cap with the valve plate (item B52). Remove the retaining ring (item D08) and remove the
Do not allow the valve plate to fall from the end cap. output shaft seal carrier (item D07) with the seal (item
Remove the gasket (item B37) from the housing. B02). Remove the O-ring (item D06) from the carrier.
Press the old seal out of the carrier. Refer to the Minor
Carefully remove the valve plate from the end cap. It Repair section for further information.
may be necessary to pry the valve plate off with a
small screwdriver. Remove the alignment sleeves Slide the output shaft and bearing assembly out of the
(item B40) from the end cap or housing. housing.
CAUTION Remove the retaining ring (item D05) and press the
output shaft (item D01) out of the bearing (item D04).
Caution must be exercised to prevent damage
to the valve plate and end cap surfaces.
Refer to Minor Repair
section for seal removal D08
information. D07
B02
B21 D06
B32
B22
B36
D05
(B25)
B26 D04
B25
B28 D01
B52
OR
B39 G01
B40
B37
B38
B41 E01 G02
Refer to Reconditioning and Replacement section for
information on items B38 and B39, and items B25,
Hex wrench: 17 mm B26, and B28.
40250114
63 - 2