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 1238 of 1275

TM 9-2350-311-20-1

Do not perform more than two compression unbalance

tests in a row to prevent discharge of batteries.

NOT E

Engine must beat normal operating

temperature before performing

compression unbalance test.

- Shut off fuel supply so engine will not start (TM 9-2350-311-10).

- Crank engine with fuel inhibited for 5 seconds to clear fuel from cylinders.

- Set TEST SELECT switches to 14, press and release TEST button.

- Wait for prompting message GO to appear.

Refer to TM 9-4910-571-12&P

for fault isolation.

Figure 3, Sheet 35 of 36

I-61

CAUTION

Go to step 6,

Figure 3 ,

sheet 36 .