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 871 of 1313
SPEEDOMETER OR TACHOMETER NOISY OR ERRATIC - Continued
STEP
1.
ARE THE SPEEDOMETER AND TACHOMETER FLEXIBLE SHAFTS IN GOOD OPERATING CONDITION?
Visually check the speedometer and tachometer flexible shafts for binding, kinks, or loose connections.
FLEXIBLE
SHAFT
T026DAA
Figure 1.
Speedometer and Tachometer Flexible Shafts
CONDITION/INDICATION
ARE THE SPEEDOMETER AND TACHOMETER FLEXIBLE SHAFTS IN GOOD OPERATING CONDITION?
DECISION
YES - Go to Step (2).
NO - Replace speedometer flexible shaft or tighten connections (Volume 5, WP
0814). Go to Step (3) to verify
problem is solved.
NO - Replace tachometer flexible shaft or tighten connections (Volume 5, WP
0817). Go to Step (3) to verify
problem is solved.
STEP
2.
ARE SPEEDOMETER AND TACHOMETER IN GOOD OPERATING CONDITION?
Test operation of tachometer and speedometer.
TM 9-2320-272-23-1
0101
0101-2
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