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1. MAIN PUMP (STEERING PUMP, LOADER PUMP)
STRUCTURE
1)
GROUP 4 DISASSEMBLY AND ASSEMBLY
1 Rotary group
1-1 High speed rotary group
1-2 Control plate
2 Adjusting piece
5 Pump housing
6 Port plate
7 Swash plate
8 Drive shaft
12 Adjustment shim
15 Taper roller bearing
16 Taper roller bearing
17 Bearing liner
20 Shaft seal ring
22 O-ring
23 O-ring
25 V-ring
27 Socket screw
30 Locking screw
31 Double break-off pin
33 Cylinder pin
51 Control valve
5
51
25
20
15
8
17
30
7
22
6,31
27
23
33
12
16
2
1-1
1-2
2
78096WE11
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GENERAL REPAIR GUIDELINES
Observe the following guidelines when
carrying out repairs on hydraulic pumps.
Close off all openings of the hydraulic unit.
Replace all of the seals.
Use only original spare parts.
Check all sealing and sliding surfaces for
wear.
Re-work of the sliding surfaces by using,
for example abrasive paper, can damage
the surface.
Fill the hydraulic pump with hydraulic oil
before commissioning.
Change the shaft seal and check its
sliding surface (drive shaft) and housing,
grease the sealing ring.
(2)
2)
ö
(1)
(2)
(3)
ö
(4)
2
1
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Assemble the sealing ring, fitting tool
holds the correct position of the sealing
ring in the pump housing.
Assemble the circlip in the correct
position.
(3)
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SEALING THE DRIVE SHAFT
Protect the drive shaft.
Remove the circlip.
Remove the shaft seal.
1 Circlip 2 Shaft seal
3)
(1)
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A
A
1
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SEALING / CLEANING THE CONTROL
VALVE
Disassemble the control valve.
Measure dimension A and note down.
Check sealing surface (1).
4)
(1)
ö
Mark the location of the connection plate
on the housing.
(2)
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DISASSEMBLE THE PUMP
Remove the control valve.
5)
(1)
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Remove the connection plate fixing bolts
and the connection plate.
Distributor plate and adjustment piston
can drop down.
(3)
ö
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Remove distributor plate.
Take note of the orientation.
Remove bearing with withdrawal tool.
Do not damage the sealing surface.
(4)
ö
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Remove the rotary group