TM-9-2350-311-20-2

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS

DECEMBER 1993

TM-9-2350-311-20-2 - Page 352 of 828

TM 9–2350–311–20–2

6–36

Change 2

6–14 EQUILIBRATION HANDPUMP ASSEMBLY

This task covers:

a.

Removal

b.

Disassembly

c.

Inspection

d.

Assembly

e.

Installation

INITIAL SETUP

Tools

Artillery and turret mechanic’s tool kit

(SC 5180–95–CL–A12)

Materials/Parts

Caps and plugs (item 7, Appx D)

Hydraulic fluid, OHT (item 21, Appx D)

Lockwashers (2) (item 55, Appx G)

Lockwashers (2) (item 56.1, Appx G)

Preformed packing (item 46, Appx G)

Preformed packing (item 47, Appx G)

Self-locking nut (item 29, Appx G)

Equipment Condition

Discharge hydraulic pressure (para 6–3.1)

Bleed hydraulic system (para 6–3.1)

a.

Removal

CAUTION

All hydraulic lines and ports must be capped to prevent contaminants from entering the hydraulic

system and causing internal damage to hydraulic components.

1

Remove adapter (1), preformed packing (2), coupling nut (3), clinch sleeve (4), reducer (5), and preformed

packing (6) at hydraulic pump (7). Discard preformed packings.

2

Remove two cap screws (8), two lockwashers (9), and two hex nuts (10) from mounting bracket (11). Dis-

card lockwashers.

3

Remove hydraulic pump (7).

4

Remove two cap screws (12), two lockwashers (13), and mounting bracket (11).

10

9

16

15

14

5

6

4

3

1

8

11

7

2

12

13