Cleaning, Inspection and Repair. - TM-10-3930-624-340092

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