TM-9-2320-285-24-1
TRUCK TRACTOR, YARD TYPE, 43,500 LB GVW, DED, 4X2, ARMY MODEL M878A1
TECHNICAL MANUAL; ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL
OCTOBER 1985
TM-9-2320-285-24-1 - Page 193 of 987
TM 9-2320-285-24-1
2-18.
STARTING SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1.
ENGINE WILL NOT START (Cont)
Step 2.
Hold key switch in start position.
Move gear shift lever slightly to each side of neutral (N) position.
a.
If engine starts, adjust neutral start switch (para 2-32e).
b.
If engine does not start, go to step 3 below.
Step 3.
Check 70 AMP circuit breaker on starter motor for tripped condition.
a.
If 70 AMP circuit breaker is tripped, go to step 4 below.
b.
If 70 AMP circuit breaker is not tripped, go to step 5 below.
Step 4.
Firmly press red reset button on 70 AMP circuit breaker.
a.
If 70 AMP circuit breaker trips, check for short in electrical system wiring; repair or replace as
necessary (para 2-35a thru 2-35d).
b.
If 70 AMP circuit breaker does not trip and engine will not start, go to step 5 below.
Step 5.
Check for loose, corroded, or damaged battery cables and terminals.
a.
If battery cables are loose, tighten connections.
If cables or terminals are damaged or corroded,
replace (para 2-34a).
b.
If battery cables and terminals are not loose, corroded, or damaged, go to step 6 below.
Step 6.
Using a hydrometer and thermometer, check specific gravity of battery electrolyte in each battery
cell (para 2-34a).
a.
If corrected specific gravity reading is less than 1.225, recharge batteries (para 2-34a).
b.
If specific gravity readings between cells of one battery differs by more than 25 points (0.025),
replace battery (para 2-34a).
c.
If corrected specific gravity reading is more than 1.225, and readings between cells of one
battery differ by no more than 25 (0.025), go to step 7 below.
2-170
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