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 518 of 1275

TM 9-2350-311-20-1

Excessive noise levels are present any time equipment is operating. Wear hearing

protection while equipment is running. Failure to do so could result in damage to your

hearing.

Ensure coolant and engine lubricant are replenished before starting engine (TM 9-

2350-311-10 and para 2-1 5).

While performing test run, check coolant and oil temperatures. Coolant

temperature should not exceed 180°F (82°C). Oil temperature should not exceed

259°F (126°C). If either condition exists, run engine at 1000 to 1200 rpm for 2

minutes before shutdown.

43 Connect both battery ground straps (para 8-28). Place MASTER switch in ON position. Start engine and

operate at 1200 ‘to 1400 rpm until engine coolant temperature is 169°F (76°C) and transmission oil

temperature is 160°F (71 ‘C). Allow engine to return to normal idle speed (650 to 750 rpm).

44 Check engine operation. If engine is not operating properly, perform STE/ACE-R PMCS testing (Appx l).

45 Check for leaks, excess smoke, and strange noises. If any problems persist, notify support maintenance.

46 Remove two locknuts, two screws, and two protective screens from cooling fans (1 53).

47 Install air intake grille handle bracket (46) and two screws (45).

48 Install right front grille assembly (44), six socket head screws (43), seven washers (42), and seven screws

(41).

4-57

WARNING

CAUTION