TM-9-2320-285-10
TRUCK TRACTOR, YARD TYPE, 43,500 LB GVW, DED, 4X2, ARMY MODEL M878A1
TECHNICAL MANUAL; OPERATOR’S MANUAL
JUNE 1985
TM-9-2320-285-10 - Page 11 of 121
TM 9-2320-285-10
Section III.
TECHNICAL PRINCIPLES OF OPERATION
Para
Para
Frame .
.............................................................
1-10
Horn .
......................................................................
1-15b
Transmission .
..................................................
1-11
Switches and Indicator Lights.
................................
1-15c
Brakes .
............................................................
1-12
Cooling System .
.....................................................
1-16
Air System .
......................................................
1-13
Fuel System
..........................................................
1-17
Steering System
.............................................
1-14
Exhaust System . .
..................................................
1-18
Electrical System .
............................................
1-15
Fifth Wheel Hydraulic System .
...............................
1-19
Vehicle Lights .
.................................................
1-15a
Winterization System .
............................................
1-20
1-10.
FRAME
Frame - Left and right frame rails provide mounting facilities for engine, transmission, front and rear axles, operator’s tilt
cab, and fifth wheel boom.
1-11.
TRANSMISSION
Transmission - Consists of torque converter and transmission.
Torque converter transmits power from engine to
transmission gearing.
Torque converter serves as both a fluid coupling and a torque multiplier.
Four planetaries within
transmission establish speed ratios.
Planetaries controlled by six hydraulic applied clutches.
Gear Shift Lever - Selects gear range.
Mechanical Lock Out - Prevents shifting to or from reverse unless brake treadle is depressed.
1-6
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