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 884 of 987
TM 9-2320-285-24-1
Section XI.
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 organizational
maintenance.
Para
Troubleshooting Symptom Index.
................
2-75
Fifth Wheel Hydraulic System
Troubleshooting .
......................................
2-76
Cab Tilt Hydraulic System
Troubleshooting .
......................................
2-77
Fifth Wheel Hydraulic System
Maintenance.
............................................
2-78
Fifth Wheel Control Lever
and Cable.
.............................................
2-78a
Para
Hydraulic Filters and Lines
and Fittings .
.............................................
2-78b
Hydraulic Filters.
...................................
2-78b(1)
Lines and Fittings .
................................
2-78b(2)
Hydraulic Reservoir .
.............................
2-78c
Cab Tilt Hydraulic System
Maintenance .
...........................................
2-79
Cab Hydraulic Pump.
............................
2-79a
Lines and Fittings .
................................
2-79b
2-75.
TROUBLESHOOTING SYMPTON INDEX
Para/Malfunction
Page
FIFTH WHEEL HYDRAULIC SYSTEM
Fifth wheel doesn’t lift.
........................................................................................................
2-76/1
2-862
Fifth wheel lifts slowly.
........................................................................................................
2-76/2
2-863
Fifth wheel creeps downward.
............................................................................................
2-76/3
2-864
Fifth wheel doesn’t lower.
...................................................................................................
2-76/4
2-865
Hydraulic oil foaming.
.........................................................................................................
2-76/5
2-865
Excessive hydraulic pump noise.
.......................................................................................
2-76/6
2-865
Hydraulic oil overheating.
...................................................................................................
2-76/7
2-866
Hydraulic reservoir overflows.
............................................................................................
2-76/8
2-866
CAB TILT HYDRAULIC SYSTEM
Cab won’t raise to 45 degrees.
...........................................................................................
2-77/1
2-867
Cab won’t lower or stops part way down.
...........................................................................
2-77/2
2-867
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
2-861
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