TM-9-2350-311-20-1

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

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 615 of 1275

TM9-2350-311-20-1

7-5 SURGE TANK AND PRESSURE RELIEF VALVE

This task covers:

a. Removal

b. Installation

I INITIAL SETUP I

T

OO

I

S

. .

Equipment Conditions

General mechanic’s tool kit (item 64, Appx H)

Air intake grille opened (para 11-8)

Torque wrench (item 72, Appx H)

Coolant system drained (TM 9-2350-311-10)

Engine exhaust deflector removed (para 4-5)

Materials/Parts

Engine exhaust grille removed (para 4-5)

Adhesive (item 1, Appx D)

Grille support plate removed (para 4-5)

Gasket (item 140, Appx G)

Radiator fan access door removed (para 4-5)

Right front grille assembly removed (para 4-5)

Right transmission door removed (para 11-7)

a. Removal

WARNIN G

Ensure engine and coolant system are cool enough to permit safe handling in order to

prevent burns.

1 Remove two screws (1), two washers (2), and retainer (3).

2 Loosen two clamps (4) at elbow (5).

3 Loosen two clamps (6 and 7).

4 Unscrew two nuts (8 and 9).

5 Disconnect five hoses (10, 11, 12, 13, and 14) from surge tank (15).

6 Lift surge tank (15) up and out.

NOTE

The location of the pressure relief valve differs between M109A2/M109A3 and

M109A4/M109A5 Howitzers.

7 Unscrew nut (16) and remove hose (17) and elbow (18).

8 Remove four screws (19), relief valve (20), and gasket (21) from block (22). Discard gasket.

7-10