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 712 of 828

TM 9–2350–311–20–2

19–4

19–2 RECUPERATOR ASSEMBLY

This task covers:

a.

Servicing with Hydraulic Fluid

b.

Servicing with High Pressure Nitrogen – Method One

c.

Servicing with High Pressure Nitrogen – Method Two

INITIAL SETUP

Tools

Nitrogen charging kit (item 3, Appx H)

M3 pump kit (item 9, Appx H)

Purging kit (item 4, Appx H)

Materials/Parts

Hydraulic fluid OHT (item 21, Appx D)

Dry nitrogen (item 22, Appx D)

Soap (item 33, Appx D)

a.

Servicing with Hydraulic Fluid

1

Remove valve cap (1) from check valve (2) at head end of recuperator cylinder (3) inside cab.

CAUTION

Hydraulic fluid must be new. Recuperator assembly must be free of contaminating matter.

NOTE

Rotate head to position drain plug at bottom.

2

Attach M3 oil pump (4) to check valve (2). Fill head until two pins (5) extend not less than 1/8 inch (3.2 mm).

Do not overfill (head requires about 0.7 pint (0.3 l)). After filling, disconnect M3 oil pump.

3

Install valve cap (1).

CAUTION

Loosen cap screws to stop pin before rotating cover to prevent damage to gasket.

4

Loosen two cap screws (6) at front end of recuperator cylinder (3).

3

2

1