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 324 of 1417

FIELD MAINTENANCE

NG90: GOVERNOR/POWER TEST FAULT ISOLATION

INITIAL SETUP:

Personnel Required

(2)

References

TM 9-2320-272-10

TM 9-4910-571-12&P

References (cont.)

WP

0193

WP

0195

WP

0205

WP

0245

WP

0246

TROUBLESHOOTING PROCEDURE

NG90: GOVERNOR/POWER TEST FAULT ISOLATION

STEP

1.

Perform G06: Power Test.

CAUTION

Check that air inlet, is clear of tools, debris, dirt, and dust before performing test.

a.

Remove air cleaner from intake housing (WP

0246).

b.

Repeat G06: Power Test Step (2) (WP

0193).

CONDITION/INDICATION

Does engine pass power test with air cleaner out?

DECISION

YES - Replace air filter

(WP

0246). After completing repair, rerun GO-Chain tests to verify problem is fixed and

no other problems exists.

NO - Go to Step (2).

TM 9-2320-272-23-2

0204

0204-1