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 1211 of 1313
FOUR PRESSURE MODE LIGHTS FLASHING - Continued
STEP
8.
DO HUB AIR SEALS LEAK?
NOTE
In extreme cold temperature hub seals may leak. Drive vehicle to ensure hub seals are
at operating temperature.
Perform leak test (Volume 3, WP
0487) on hub air seals.
T0419DAA
AIR SEALS
WHEEL
VALVE
Figure 8.
Hub Air Seals.
CONDITION/INDICATION
DO HUB AIR SEALS LEAK?
DECISION
YES - Front air seals leak. Replace faulty air seals (Volume 3, WP
0481). Go to Step (10) to verify problem is
solved.
YES - Rear air seals leak. Replace faulty air seals (Volume 3, WP
0482). Go to Step (10) to verify problem is
solved.
NO - Go to Step (9).
TM 9-2320-272-23-1
0145
0145-10
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