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 284 of 1417
G08: COMPRESSION UNBALANCE TEST - Continued
CONDITION/INDICATION
Does VTM display a number?
DECISION
YES - Go to Step (4).
NO - Go to Step (2).
STEP
2.
Check VTM display message.
Check if VTM displays GO.
CONDITION/INDICATION
Does VTM display GO?
DECISION
YES - Go to Step (1).
NO - Go to Step (3).
STEP
3.
Check VTM display message.
Check if VTM displays FAIL.
CONDITION/INDICATION
Does VTM display FAIL?
DECISION
YES - Go to Step (1). If FAIL message still appears, notify supervisor.
NO - VTM displays E013, this may indicate discharged batteries or low cranking speed. Also, operator may have
stopped cranking during test. Check and repeat test.
STEP
4.
Check test limits.
Compression unbalance test limit is 0-15%.
CONDITION/INDICATION
Is compression unbalance within limits?
DECISION
YES - End of Go-chain testing.
NO - Rerun compression unbalanced test. If unbalanced test is still out of limits, notify supervisor.
END OF WORK PACKAGE
TM 9-2320-272-23-2
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