TM-9-2320-285-24-2
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-9-2320-285-24-2 - Page 413 of 698
TM 9-2320-285-24-2
Section VIII.
HYDRAULIC SYSTEMS MAINTENANCE
This section contains the information you need to maintain the:
*
Fifth Wheel Hydraulic System
*
Cab Tilt Hydraulic System
It gives you instructions on how to troubleshoot problems and repair or replace the components that are
within the scope of direct support maintenance.
Para
Troubleshooting Symptom Index .
....................................................................................................
3-39
Fifth Wheel Hydraulic System Troubleshooting .
.............................................................................
3-40
Cab Tilt Hydraulic System Troubleshooting .
...................................................................................
3-41
Fifth Wheel Hydraulic System Maintenance .
...................................................................................
3-42
Hydraulic Pump .
.........................................................................................................................
3-42a
Power Take-Off .
.........................................................................................................................
3-42b
Hydraulic Control Valve .
.............................................................................................................
3-42c
Hydraulic Cylinders .
....................................................................................................................
3-42d
Cab Tilt Hydraulic System Maintenance .
.........................................................................................
3-43
Hydraulic Pump .
.........................................................................................................................
3-43a
Hydraulic Cylinder .
......................................................................................................................
3-43b
Hydraulic Latches .
......................................................................................................................
3-43c
Hold Down Assembly
a ..............................................................................................................
3-43d
Safety Bar .
..................................................................................................................................
3-43e
3-39.
TROUBLESHOOTING SYMPTOM INDEX
Para/Malfunction
Page
FIFTH WHEEL HYDRAULIC SYSTEM
Fifth wheel doesn’t lift .
..................................................................................................
3-40/1
3-408
Fifth wheel lifts slowly .
..................................................................................................
3-40/2
3-410
Fifth wheel creeps downward .
.....................................................................................
3-40/3
3-411
Fifth wheel doesn’t lower .
.............................................................................................
3-40/4
3-411
Hydraulic oil foaming .
...................................................................................................
3-40/5
3-413
Hydraulic oil overheating .
.............................................................................................
3-40/6
3-413
CAB TILT HYDRAULIC SYSTEM
Cab won’t raise to 45 degrees .
....................................................................................
3-41/1
3-414
Cab won’t lower or stops part way down .
.....................................................................
3-41/2
3-414
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
3-407
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