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 858 of 1275

TM9-2350-311-20-1

Pressure Checks

Vehicle has no brakes when final drives are disconnected. Failure to securely block

vehicle tracks could injure personnel or damage vehicle or other equipment if vehicle

rolls out of control.

1 Start engine and shift transmission into fourth gear.

CAUTIO N

If transmission oil temperature gets over 300°F (149°C) during any test, stop engine

and troubleshoot transmission.

2 Run engine at 1200 to 1500 rpm for 3 to 8 minutes, or until transmission temperature reaches about 220°F

(105°C).

3 Reduce engine speed to idle.

4 Shift transmission through all ranges several times.

5 Shift transmission to neutral (N).

6 Apply brakes.

7 Increase engine speed to 1350 (1200 to 1500) rpm.

8 Check transmission oil level. Oil level must be at FULL mark on dipstick.

Oil is hazardous waste and must be disposed of in accordance with local procedures

or direction of the local Hazardous Waste Management office.

9 Add or drain oil as necessary (TM 9-2350-311-10).

10 During warmup period, check transmission for leaks.

11 Stop engine.

12 Tighten loose bolts, plugs, and hose fittings. Replace defective hoses. If leakage cannot be stopped, notify

support maintenance and stop pressure tests.

Transmission contains hot oil under high pressure. Stop engine before removing or

installing pipe plugs and gage adapter in pressure test points. Install pipe plug as soon

as gage adapter is removed. Remove only pipe plug at test point.

9-3

WARNING

WARNING

WARNING