TM-9-2320-272-23-2

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 2 OF 5

SEPTEMBER 2012

TM-9-2320-272-23-2 - Page 294 of 1417

FIELD MAINTENANCE

NG20: NO CRANK- NO START

INITIAL SETUP:

Personnel Required

(2)

References

TM 9-2320-272-10

TM 9-4910-571-12&P

References (cont.)

WP

0202

WP

0220

WP

0221

WP

0303

TROUBLESHOOTING PROCEDURE

NG20: NO CRANK- NO START

STEP

1.

Try to crank engine.

a.

Set vehicle controls to crank engine (TM 9-2320-272-10).

b.

Depress starter switch and listen to starter motor.

CONDITION/INDICATION

Does starter motor sound like it is running overspeed?

DECISION

YES - Go to Step (2).

NO - Perform NG80: Starter Circuit Tests (WP

0202).

STEP

2.

Check teeth on flywheel.

a.

Remove starter (WP

0303).

b.

Check for missing and/or damaged teeth on flywheel.

CONDITION/INDICATION

Are all teeth good?

DECISION

YES - Replace starter (WP

0303). After completing repair, rerun GO-chain tests to verify the problem is fixed

and no other problem exists.

NO - Replace flexplate M939/A1 (WP

0220), M939A2 (WP

0221). After completing repair, rerun GO-chain tests

to verify the problem is fixed and no other problem exists.

END OF WORK PACKAGE

TM 9-2320-272-23-2

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