Assembly. - TM-10-3930-631-340074

TM 10-3930-631-34

KEY to fig. 7-2:

(5) Measure inside diameter of bearings in front

1. Screw

16. Adapter

plate (6, fig. 7-2) and adapter (18). Replace front plate

2. Lock washer

17. Gasket

or adapter if inside diameter of bearings exceeds 0.691

3. Screw

18. Body adapter

inch (17.5 mm).

4. Screw, 12 point

19. Pump body

(6) Check gear pockets in gear bodies. If inside

5. Screw

20. Dowel pin

diameter of gear pockets exceed 1.719 inches (43.6

6. Back plate

21. Dowel pin

mm) replace body.

7. Packing

22. Drive gear

8. Rear body

23. Key

(7) Replace all parts contained in pump repair

9. Pump gear

24. Idler gear

kit (TM10-3930-631-34P).

10. Diaphragm

25. Diaphragm

d. Assembly.

11. Backup gasket

26. Seal

(1) Clean all metal parts with cleaning

12. Protector gasket

27. Spring

compound, solvent (Fed. Spec. P-D-680) and dry

13. Seal

28. Ball

thoroughly. Coat all parts with engine oil (OE) before

14. Screw

29. Front plate

15. Lock washer

30. Seal

assembly.

(4) Secure pump in a vise. Remove screws (3,

(2) Drive dowel pins (20 and 21) in front and

4 and 5). Remove back plate (6), and packing (7).

back plates (6 and 29).

Discard packing.

(3) Tuck new diaphragm seal (26) into grooves

(5) Remove pump from vise and turn pump

of front plate (29) with open part of "V" section down.

shaft end up. Shake pump to remove gears (9) from

(4) Press new protector gasket (12), backup

rear body (8). Remove rear body and diaphragm (10),

gasket (11) and diaphragm (25) into diaphragm seal.

gasket (11), protector gasket (12) and seal (13). Discard

diaphragm, gaskets and seal.

Diaphragm must be installed with bronze face up.

(6) Remove screws (14) and lock washers (15)

(5) Install balls (28) and springs (27) in bores in

and remove adapter (16) and gasket (17). Discard

front plate.

gasket.

(6) Install new diaphragm seal (13), protector

(7) Remove key (23) from drive gear.

gasket (12), backup gasket (11) and diaphragm (10) in

(8) Tap drive shaft with a rubber mallet to

body adapter (18) in the same manner. Intake hole of

separate front plate (29) from pump body. Remove drive

diaphragm must be alined with intake hole in the face of

gear (22) and idler gear (24) from body.

(9) Remove diaphragm (25), backup gasket

the body adapter. The entire diaphragm must fit within

(11), protector gasket (12) and seal (26). Discard

the raised rim of the diaphragm seal.

diaphragm, gaskets and seals.

(7) Slide drive gear (22) and idler gear (24)

(10)Remove springs (27) and balls (28) from

through bearings in front plate (29).

front plate.

(8) Apply a thin coat of heavy grease (GAA) to

(11)Drive dowel pins (20 and 21) from body and

both milled faces of body (19). Place body over gears on

adapter with a brass drift and separate body (19) from

front plate. Half moon port cavities in body must face

adapter (18). Remove and discard

packing (7) from between body and adapter.

away from front plate. The small drilled hole in one of the

(12)Remove seal (30) from front plate using a

cavities must be on the pressure side of the pump

suitable puller. Discard seal.

opposite adapter (16).

c. Cleaning, Inspection and Repair.

(9) Install new packing (7) in groove in body

(1) Clean all metal parts in cleaning com-

adapter (18) and install adapter over gear shafts and on

pound, solvent (Fed. Spec. P-D-680) and dry thoroughly

body. Tap adapter in place with a rubber hammer.

with compressed air.

(10)Install key (23) in drive shaft and install

(2) Inspect parts for nicks and burs. Remove

burs and nicks with emery cloth if possible.

gears (9) on shaft.

(3) Inspect drive gear for broken keyway and

(11)Coat milled surfaces of rear body (8) with

damaged or worn splines and gear teeth. Check drive

thin coat of grease (GAA). Half moon cavities of body

gear and idler shafts for wear in bearing and seal areas.

must face away from adapter and drilled hole in one

Bearing areas measuring less than 0.685 inch (17.4 mm)

cavity must be on pressure side of pump.

must be replaced. If bearing area is less than indicated

(12)Install new packing (7) in groove of back

replace gear. Shafts and gears must be replaced as

plate (6) and install plate on body (8). Secure with

assemblies.

(4) Inspect drive, idler and pump gears for

screws (3, 4, and 5). The twelve point headed screws

scoring and wear. If gears are worn or scored, replace

(4) are installed on each side of the pressure port (fig. 7-

gears.

3). The longer hex head

7-5