Disassembly - TM-10-3930-621-340170

TM 10-3930-621-34

(7) Slowly pull plunger (10) up and out from

(6) Remove plug(28) from

housing (37) with upper seal (9) and upper ring (8)

bottom of housing and remove and discard packing (7).

attached. Remove upper seal and ring. Discard seal.

(7) Remove spring (271 and slide sleeve (23)

(8) Remove lower seal plate screws (12) and

with poppet from bottom opening in housing.

lower seal plate (11).

(8) Remove poppet (26) from sleeve (23) and

(9) Remove lower seal (9) and lower ring (8)

packing (25) from poppet groove. Discard packing.

from housing. Discard seal.

(9) Tap or gently pry backup ring (24) from

d. Disassemble lift plunger as follows: (1) Secure

sleeve (23).

valve in vise horizontally.

f. Remove check valve plugs (2), packings (3),

(2) Remove socket head screws (32) and

springs (4), and poppets (5). Discard packings.

remove plunger cap (29) with adjusting screw (31) and

10-46. Cleaning, Inspection, and Replacement

nut (30). Mark position of nut on adjusting screw.

a. Clean all parts with cleaning compound, solvent

(3) Place a drift pin through eye of lift plunger

(Spec. P-S-661) and dry thoroughly with compressed

(38) and remove lift plunger as instructed in procedure c.

air.

e. Disassemble relief valve as follows: (1) Secure

b. Inspect springs for cracks, wear. Deformation or

valve in vise horizontally.

signs of weakness.

(2) Remove cap nut (13), lock nut (15), and two

c. Inspect machined surfaces for nicks, scratches .

copper washers (14 and 16) from adjusting screw (17).

gouges, or other damage which would cause internal or

(3) Slowly remove adjusting screw (17) from

external leakage.

adjusting plug (18), and remove pilot spring (20).

d. Inspect housing for cracks, stripped threads, or

(4) Remove adjusting plug (18) from pilot plug

other damage.

(19) and remove pilot plug with pacing (7) from valve

e. Inspect

plungers

and, plunger boxes for

housing. Discard packing.

scoring, chips. nicks, cracks or other damage which

(5) Tilt valve housing and tap out spring guide

could result in leaks.

(21).

f. Replace all seals and packing. Replace all

defective parts as authorized.

KEY to fig. 10-12:

1. Control valve assembly

20. Pilot spring

2. Check valve plug

21. Spring guide

3. Packing

2'2. Packing

4. Check valve spring

23. Sleeve

5. Poppet

24. Backup ring

6. End plug

25. Packing

7. Packing

26. Poppet

8. Ring

27. Spring

9. Seal

28. Plug

10. Tilt plunger

29. Plunger cap

11. Seal plate

30. Nut

12. Screw

31. Adjusting screw

13. Cap nut

32. Socket screw

14. Washer

33. Plunger cap

15. Lock nut

34. Sleeve screw

16. Washer

35. Seat

17. Adjusting screw

36. Spring

18. Adjusting plug

37. Housing

19. Pilot plug

38. Lift plunger'

10-25