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 39 of 987
TM 9-2320-285-24-1
2-6.
TROUBLESHOOTING SYMPTOM INDEX (CONT)
Para/Malfunction
Page
HEATERS (cont)
Batteries not warmed when battery warmers
connected to power source .
...............................................................
2-68/5
2-765
Coolant not warmed when coolant heater
connected to power source .
.......................................................................
2-68/6
2-766
Engine oil heater does not operate .
............................................................
2-68/7
2-768
All winterization system heaters not operating .
..........................................
2-68/8
2-769
FIFTH WHEEL HYDRAULIC SYSTEM
Fifth wheel doesn’t lift .
................................................................................
2-76/1,3-40/1
2-862,3-408
Fifth wheel lifts slowly .
................................................................................
2-76/2,3-40/2
2-863,3-410
Fifth wheel creeps downward .
....................................................................
2-76/3,3-40/3
2-864,3-411
Fifth wheel doesn’t lower .
...........................................................................
2-76/4,3-40/4
2-865,3-411
Hydraulic oil foaming .
.................................................................................
2-76/5,3-40/5
2-865,3-413
Excessive hydraulic pump noise .
................................................................
2-76/6
2-865
Hydraulic oil overheating .
...........................................................................
2-76/7,3-40/6
2-866,3-413
Hydraulic reservoir overflows .
....................................................................
2-76/8
2-866
CAB TILT HYDRAULIC SYSTEM
Cab won’t raise to 45 degrees .
...................................................................
2-77/1,3-41/1
2-867,3-414
Cab won’t lower or stops part way down .
...................................................
2-77/2,3-41/2
2-867,3-414
Hydraulic latches lock before cab is
all the way down .
................................................................................
2-77/3
2-867
Hydraulic latches won’t lock .
......................................................................
2-77/4
2-867
Hydraulic latches or hydraulic cylinder leak fluid .
.......................................
3-41/3
3-414
Hydraulic pump leaks fluid at filler plug or vent .
.........................................
3-41/4
3-414
SPEEDOMETER
Pointer moves erratically or scraping
noise is heard .
....................................................................................
2-81/1
2-907
TACHOMETER
Tachometer inoperative or does not indicate
correct engine speed .
.........................................................................
2-82/1
2-908
PRESSURE GAGES
WATER TEMP, OIL-PRESS, or FUEL gage inoperative .
..........................
2-83/1
2-908
AIR PRESS gage doesn’t indicate correct
air pressure .
........................................................................................
2-83/2
2-909
HOURMETER
Hourmeter inoperative .
...............................................................................
2-84/1
2-910
2-16
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