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 15 of 987
TM 9-2320-285-24-1
1-15.
YARD TRACTOR (CONT)
8.
WHEELS.
Six 12:00 x 20, 16 ply tires plus spare; dual mounted rear tires; all tires and wheels same size.
9.
STEERING SYSTEM.
Includes steering wheel and column, steering gear, and hydraulic system for power assist.
10.
FRAME AND TOWING ATTACHMENTS.
Two flange beams extend the length of tractor; tow shackles and tie
down hooks at front and rear of tractor are included.
11.
SPRINGS AND SHOCK ABSORBERS.
Two shock absorbers and two leaf spring assemblies, located at left and
right front axle.
12.
CAB AND BODY.
Fully enclosed cab rubber mounted to cab deck; deck attached to frame by two pivot pins at
front and two hydraulic latches at rear.
13.
ACCESSORIES.
Includes windshield washer and wiper, rearview mirrors, air horn, cab heater, and winterization
system heaters.
14.
HYDRAULIC SYSTEMS.
Three hydraulic systems: fifth wheel hydraulic system to raise and lower fifth wheel
boom, cab tilt hydraulic system to tilt and lower cab deck, and steering hydraulic system for power assist.
1-16.
ENGINE
318 cubic inch, 6 cylinder, overhead 4-valve, 2 cycle diesel engine; engine-mounted oil filter and external oil filter remove
impurities from engine lubrication system. engine oil sampling valve permits sampling of used engine oil for laboratory
analysis.
Engine provides mounting facilities for fan, air compressor, alternator, and power steering pump.
NOTE
Refer to TM 9-2815-205-34, Diesel Engine Maintenance Manual,, for detailed description of
engine system.
1.
FUEL INJECTORS.
Six-injectors spray atomized fuel under pressure into combustion chamber.
2.
FUEL PUMP.
Engine driven, mechanical gear pump draws fuel from supply tank through primary and secondary
fuel filters and sends fuel under pressure to fuel injectors.
1-6
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