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 726 of 1313
ENGINE WILL NOT CRANK; SOME ELECTRICAL SYSTEMS INOPERATIVE OR WEAK - Continued
STEP
4.
ARE BATTERIES SPECIFIC GRAVITY READINGS CORRECT?
a.
Perform a specific gravity test (TM 9-6140-200-14).
T0681DAA
Figure 4.
Specific Gravity Test.
b.
Batteries must test 1.225 or greater, temperature corrected.
c.
Each cell in a battery must test within 25 points of the other cells.
d.
If any battery or batteries do not meet requirements, recharge as required (TM 9-6140-200-14).
e.
Perform specific gravity test again.
CONDITION/INDICATION
ARE BATTERIES SPECIFIC GRAVITY READINGS CORRECT?
DECISION
NO - Replace defective battery (Volume 2, WP
0346). Go to Step (6) to verify problem is solved.
YES - Go to Step (5).
TM 9-2320-272-23-1
0084
0084-5
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