GROVE Published 10-21-2010, Control# 198-04 4-41
5540F/YB5515 SERVICE MANUAL HYDRAULIC SYSTEM
COMPONENT REPAIR
Hydraulic Pump Repair
Removal
1. Drain the oil from the hydraulic tank.
2. Disconnect the inlet and outlet lines from the pump.
Place caps on the lines and plugs in the open ports of
the pump to keep dirt out of the system.
3. Remove the pump mounting bolts and lockwashers.
Remove the pump from the transmission,.
4. Take the pump to a clean work area or disassembly.
Disassembly
NOTE: Before disassembling the pump, ensure that the
pump, bench and tools are thoroughly clean.
1. Lightly mark the shaft end cover 2 Figure 4-41, gear
housings (10, 24, 38 and 52) and port end cover 57 to
ensure proper assembly.
2. Clamp the shaft end cover 2, with shaft pointing down, in
a vice.
3. Remove mounting lockwashers 59 and nuts 60.
4. Remove port end cover 57.
5. Remove gear housing 52. Tap the housing with a soft
hammer, if necessary.
6. Since the metal components are not replaceable there is
no need to disassemble the gear housings 52, 38, and
24, except for removing the seals. Remove plastic seals
45 and 56, rubber seals 46 and 55 and o-rings 51 and
53.
7. Remove connecting shaft 48.
8. Remove spacer plate 44.
9. Remove gear housing 38. Tap the housing with a soft
hammer, if necessary.
10. Remove plastic seals 31 and 43, rubber seals 32 and 42
and o-rings 37 and 40.
11. Remove connecting shaft 34.
12. Remove spacer plate 30.
13. Remove gear housing 24. Tap the housing with a soft
hammer, if necessary.
14. Remove plastic seals 17 and 29, rubber
seals
18 and 28
and o-rings 23 and 25.
15. Remove connecting shaft 20.
16. Remove spacer plate 16.
17. Remove gear housing 10. Tap the housing with a soft
hammer, if necessary. Gears 7 and 8, thrust block 6 and
seals 4 and 5 will remain with shaft end cover 2.
18. Remove thrust block 13 from gear housing 10.
19. Remove plastic seal 15, rubber seal 14 and o-rings 9
and 12.
20. Push up on drive gear 7 to remove it from shaft end
cover 2. Remove driven gear 8.
21. Remove thrust block 6. Remove plastic seal 4 and
rubber seal 5.
22. Remove the four studs 58.
23. Remove shaft end cover 2 from the vice. Using a flat
head screw driver, remove lip seal 1 from shaft end
cover 2.
CAUTION
The pump is heavy. Use a sling and overhead crane or a
support to hold the pump in position while removing the
mounting hardware.
CAUTION
Seals are the only recommended service parts for this
pump because it is economically unfeasible to repair the
pump; service parts and labor to install the parts will often
exceed a new pump cost. Also, replacing one or more
components of the pump will affect volumetric efficiency.
Once a pump is broken in the components wear patterns
match the components’ wear patterns producing a
“customized” fit. Changing components will affect the
“custom” fit.
Reference Only
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