TM-9-2320-272-23-1

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

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5

SEPTEMBER 2012

TM-9-2320-272-23-1 - Page 870 of 1313

FIELD MAINTENANCE

SPEEDOMETER OR TACHOMETER NOISY OR ERRATIC

INITIAL SETUP:

Tools and Special Tools

Tool Kit, General Mechanic's: Automotive

(Volume 5, WP

0826, Table 1, Item 56)

Personnel Required

(2)

References

Volume 5, WP

0814

References (cont.)

Volume 5, WP

0815

Volume 5, WP

0817

Equipment Condition

Vehicle parked and engine shut down.

(TM

9-2320-272-10)

TROUBLESHOOTING PROCEDURE

SPEEDOMETER OR TACHOMETER NOISY OR ERRATIC

NOTE

Conduct these malfunction tests if the speedometer or tachometer is noisy or erratic. This

procedure will check the speedometer/tachometer flexible shaft for binding, kinks, or loose

connections, and the speedometer or tachometer for proper operation.

TM 9-2320-272-23-1

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