Figure 3-9. Hydraulic pump, disassembly and reassembly.

TM 10-3930-630-34

1 Screw

7 Packing

13 Bushing

19 Spring

25 Plug

2 Retaining ring

8 Wear ring

14 Dowel pin

20 Spool

26 Packing

3 Flange

9 Bushing

15 Packing

21 Cone

27 Spring

4 Seal

10 Dowel pin

16 Wearing

22 Spring

28 Spool

5 Packing

11 Drive gear

17 Plug

22 Setscrew

29 Dowel pin

6 Packing

12 Idler gear

18 Packing

24 Setscrew

30 Body

Figure 3-9. Hydraulic pump, disassembly and reassembly.

insert face down into the pump bores. Place new

turned by hand.

packing (7) and wear ring (8) on the shoulder of bushing

(9) Install setscrews (24 and 23), spring

(9).

(22), cone (21), spool (20) and spring (19) into relief

(6) Position two new drain packings (5) in

valve bore. Install new packing (18) on plug (17) and

the recesses in the face of pump body (30) and place

tighten plug until it bottoms.

new body packing (6) in its recess around the bushings.

b. Installation.

(7) Coat valve spool (28) with oil

(1) Refer to paragraph 2-14 and install

(OE/HDO) and install spring (27) on spool (28). Install

the hydraulic pump. Refer to TM 10-3930-630-12 and

spool (28) (spring end last) into the valve bore. Install

bleed the hydraulic system.

plug (25) with new packing (26).

(2) Check the hydraulic oil level. Run

(8) Install new flange oil seal (4) and

pump for one minute at no load, idle speed, to allow the

install flange (3) on pump body (30). Secure with

retaining ring (2) and screws (1). Tighten screws firmly.

Turn shaft to see if it has some drag, but can still be

3-15