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 348 of 828

TM 9–2350–311–20–2

6–32

Change 2

6–12 ACCUMULATOR ASSEMBLY (SECONDARY)

This task covers:

a.

Removal

b.

Service

c.

Test-Leakage

d.

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)

Lockwashers (4) (item 55, Appx G)

Preformed packing (item 48, Appx G)

Equipment Condition

Discharge hydraulic pressure (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 hose connector (1), reducer (2), and preformed packing (3) from secondary accumulator assembly

(4). Discard preformed packing.

2

Remove two machine screws (4.1) and mechanical guard (4.2) from secondary accumulator (4).

3

While supporting secondary accumulator (4), remove two cap screws (5), two flat washers (5.1), two lock-

washers (6), two hex nuts (7), and retaining strap (8) from each accumulator bracket (9 and 10). Discard

lockwashers.

4

Remove secondary accumulator (4).

5

If necessary to replacement, remove instruction plate (11) from secondary accumulator (4).

6

Remove four cap screws (12), four flat washers (13), and mounting brackets (9 and 10).

b.

Service

Service secondary accumulator assembly (para 19–6).

c.

Test-Leakage

1

Plug hydraulic tube hole in secondary accumulator (4).

2

Submerge secondary accumulator (4) completely in water for at least ten minutes. There must be no evi-

dence of leakage during the entire period.

3

Replace secondary accumulator (4) if it leaks.