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ME 3930-624-34/5-8
1. Countersunk capscrew
17. Spool
2. Mounting flange
18. Spring
3. Seals
19. Plug
4. Preformed packing
20. Preformed packing
5. Backup rings
21. Spring
6. Preformed packing
22. Spool
7. Front bushings
23. Setscrew
8. Dowel
24. Spring
9.  Drive shaft (gear)
25. Cone
10. Idler gear
26. Plug
11. Rear bushings
27. Preformed packing
12. Dowel
28. DoweI
13. Preformed packing
29. Preformed parking
14. Backup ring
30. Plug
15. Plug
31. Plump body
16. Preformed packing
Figure 5-8. Hydraulic pump, exploded view.
c. Cleaning, Inspection and Repair.
paper-like texture, and a light gray, or silvery color
(1) Clean all parts with a solvent and dry with
(when dry), the oil is probably dirty or foamy.
compressed air. Flush the hydraulic system before
Check the suction line for leaks. If the pump body
reinstalling the pump.
is to be reused, hone the face flat with a fine stone
(2) Check the bushing bores near the front of
and clean thoroughly.
the housing. using a 2 in. inside micrometer. If the
(4) Inspect the shaft seals in the end plate. If
bores measure over 1.770 in.. discard the pump
they are not damaged or have not been leaking they
body. This indicates the pump has been subjected
can be reused. Place a straight-edge across the
to excessive pressures. Check the system to
machined surface that faces the pump body. If the
determine the cause.
flange is bowed. replace.
(3) Measure the depth of the grooves cut by
(5) Looking at the plate from the pump side,
the gears. If deeper than 0.005 in., a reduced flow
measure the top left and lower right mounting
of hydraulic oil results. The gear track should have
holes. If the holes are larger than 0.441 in.
a smooth texture radially and should be a darker
diameter. replace the flange. This indicates the
color than the rest of the body. If it has a sand-
pump has been running with the mounting bolts
5-8

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