Hyster D174, Service & Repair Manual

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1900 SRM 97 Hydraulic Gear Pump Repair
NOTE: THERE CAN BE A VARIATION OF INTERNAL PARTS ON DIFFERENT MODELS OF LIFT TRUCKS.
1. SNAP RING
2. BEARING
3. SEAL
4. FRONT COVER
5. PLUG
6. RING SEAL
7. ROLLER BEARINGS
8. SEALS
9. THRUST PLATE
10. DRIVE SHAFT AND GEARS
11. HOUSING SEAL
12. GEAR HOUSING
13. BODY
14. CONNECTOR SHAFT
15. GEAR SET
16. GEAR HOUSING
17. REAR COVER
18. WASHER (4)
19. STUD (4)
20. NUT (4)
Figure 8. Hydraulic Gear Pump Tandem
4. Check thrust plates for wear or grooves. If
the thrust plate is worn more than 0.05 mm
(0.002 in.), it must be replaced. Replace thrust
plate if it has grooves or holes. Dirty oil causes
the thrust plate to wear near where the gears
engage. Small holes on the outlet side the thrust
plate are caused by cavitation. Lack of oil can
also cause small holes in the thrust plates. If the
color of the thrust plates has changed, the pump
was too hot.
5. Inspect all machined surfaces for scratches or
damage. Remove with emery cloth any metal
that is above the flat surface. Check surfaces
with a straight edge.
Inspect grooves for the
seals for dirt or scratches.
6. Inspect bearings for wear or damage. Replace
bearings if there is any small hole on the bearing
surface. Replace bushing if it is not round.
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