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 500 of 1275

8

9

10

11

12

13

14

15

16

17

TM 9-2350-311-20-1

Dial 10 into TEST SELECT (179) on VTM (169) and press and release TEST button (180). VTM should now

display engine rpm. Idle speed should be between 550 and 600 rpm.

Idle powerplant between 550 and 600 rpm for about 2 minutes.

Push throttle control lever (181 ) until engine speed increases to 1000 rpm.

Continue to operate powerplant at 1000 rpm until ENGINE WATER TEMP gage (182) registers at least 185°F

(85°C).

CAUTIO N

Failure to idle engine before shutting engine down can result in damage to

turbocharger.

After powerplant has reached normal operating temperature, release throttle control lever(181 ), and allow

engine to idle at 550 to 600 rpm.

Perform any additional STE/lCE-R test as required.

Check engine for leaks, excessive smoke, strange noises, and/or vibrations. If any of these problems persist,

notify support maintenance.

WARNIN G

Keep hands and clothing clear of moving parts when operating shutoff lever. Failure to

follow this warning can result in severe injury or death to personnel.

To shut off powerplant, pull and hold shutoff lever (1 83) until powerplant stops, then release lever.

Turn MASTER switch (176) OFF.

Pull VTM power switch (174) to OFF.

4-39