Centrifugal Pump Overhaul - TM-5-4320-258-340066

TM 5-4320-258-34

KEY to fig. 5-2:

member (23). Remove the seal stationary member from the

seal plate.

1. Nut

Note: The seal members are not replaceable

2. Lock washer

individually. When replacing the seal, be sure to replace all

3. Pump body

parts that are provided in the seal kit.

4. Stud

Install the seal stationary member (23) in the

5. Volute gasket

seal plate (24); install the seal plate on the bearing housing

6. Cap screw

(40) with nuts (21) and lock washers (22).

7. Lock washer

8. Flat head screw

Lubricate the inside diameter of the seal

9. Nut

rotating member (20). Install the rotating member on the

10. Lock washer

shaft, and install the seal spring (19). Take care to prevent

11. Wear plate

damage to the interior of the seal member during assembly or

12. Volute

premature failure will result. Also use extreme care to prevent

13. Lock nut

damage to the contact faces, both the stationary and rotating

14. Impeller nut

seal members.

15. Impeller

When installing the impeller (15), be sure to

16. Woodruff key

install the same thickness of shims (17 and 18) that was

17. Shim

removed.

18. Shim

Reassemble the remainder of the pump by

19. Seal spring

reversing the disassembly procedure.

5-4.

Centrifugal Pump Overhaul

20. Seal rotating member

Disassembly. Remove the pump from the

21. Nut

22. Lock washer

engine and skid (TM 5-4320-258-12). Disassemble in the

23. Seal stationary member

sequence indicated in figures 5-1 and 5-2. Note the following:

24. Seal plate

(1) Press the impeller shaft (39, fig. 5-2) and

25. Pipe plug

bearings (36 and 38) from the bearing housing (40) as an

26. Coupling

assembly.

27. Pipe nipple

(2) Remove the retaining rings (35 and 37) and

28. Stud

press the ball bearings (36 and 38) from-the shaft.

29. Preformed packing

Cleaning and Inspection.

30. Cap screw

(1) Discard and replace all seals, gaskets, and

31. Lock washer

packings.

32. Bearing cap

(2) Clean the ball bearings as directed in

33. Grease seal

paragraph 2-7.

34. Preformed packing

(3) Clean all remaining parts with cleaning

35. Retaining ring

solvent (FED. Spec. P-D-680); wipe dry.

36. Ball bearing

(4) Inspect the check valve seat for cracks,

37. Retaining ring

chipped edges, and other damage; replace a damaged check

38. Ball bearing

valve seat.

39. Impeller shaft

(5) Inspect the suction flange and discharge

40. Bearing housing

elbow for distortion, cracks, and damaged connector grooves.

41. Grease seal

Remove nicks and burrs from the connector grooves with a

Remove the nuts (1) and lock washers (2) that

fine stone. Replace if damaged beyond repair.

secure the pump body (3) to the bearing housing (40); slide

(6) Inspect the pump body for cracks, loose or

the pump body straight out to disengage it from the remainder

damaged studs, and for damaged threads.

Clean up

of the pump which is secured to the engine.

damaged threads with a thread die. Replace any damaged

Remove the cap screws (6) and lock washers

studs. Replace the housing if worn beyond repair.

(7) that secure the assembled volute (12) and wear plate (11)

(7) Inspect the wear plate for damage or wear.

to the seal plate (24); remove the assembled parts.

If the wear is perceptible, replace the plate.

Remove the nuts (13 and 14) that secure the

(8) Inspect the volute for cracks, distortion, and

impeller (15) to the impeller shaft (39). Pull the impeller from

wear. Replace if damaged.

the shaft and remove the key (16). Remove the shims (17

(9) Inspect the impeller for cracked, chipped,

and 18), seal spring (19), and seal rotating member (20) from

worn or broken vanes, damaged or distorted bore or keyway,

the shaft.

and other damage; replace a damaged impeller.

Remove the nuts (21) and lock washers (22)

(10) Inspect the ball bearings for scored balls or

that secure the seal plate (24) to the bearing housing (40);

races,

cracked

races,

signs

overheating,

remove the seal plate with the assembled seal stationary

5-5