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 20 of 987
TM 9-2320-285-24-1
1-22.
AXLES
1.
FRONT AXLE.
I-beam type steerable axle
connected to vehicle by two leaf springs and shock
absorbers.
2.
REAR AXLE.
Mounted to vehicle frame through
rubber pads; includes double-reduction drive unit and
differential.
3.
DIFFERENTIAL.
Gear assembly mounted on
rear axle housing; transmits motive power from propeller
shaft to rear axle shaft.
1-23.
BRAKES
1.
FRONT AXLE BRAKES.
Drum and shoe type,
pneumatic brakes controlled by foot operated treadle
valve; pressure on treadle valve determines amount of
air pressure delivered to brakes.
2.
FRONT AXLE BRAKE AIR CHAMBERS.
Four
air chambers; air is delivered to chambers through ratio
reducing valve which reduces air pressure under non-
emergency conditions.
Air chambers deliver air pressure
to front brakes.
3.
REAR AXLE BRAKES.
Drum and shoe type,
pneumatic brakes controlled by foot operated treadle
valve; pressure on treadle valve determines amount of
air pressure delivered to brakes.
4.
REAR AXLE BRAKE AIR CHAMBERS.
Two air chambers deliver air pressure to rear brakes.
Fail-safe spring
type air chambers apply parking brake automatically with loss of air pressure.
5.
AIR RESERVOIRS.
Two air reservoirs, connected in series.
Air from air compressor enters supply reservoir
where it cools and water vapor condenses; dry air is then routed to service reservoir for use by vehicle pneumatic
components.
Automatic drain valve ejects water from supply reservoir.
6.
AIR COMPRESSOR, ALCOHOL EVAPORATOR, AND AIR STRAINER.
Liquid cooled, single acting, two cylinder
in-line type air compressor includes governor, alcohol evaporator, and air strainer.
Air strainer, mounted on air
compressor intake adapter, filters impurities from air used by compressor.
Alcohol evaporator delivers alcohol vapor to air
compressor at intake adapter to increase air system efficiency during cold weather operation.
7.
GOVERNOR.
Regulates air compressor operation.
When air pressure reaches pre-set maximum, governor halts
air compressor operation; when air pressure reaches pre-set minimum, governor resumes air compressor operation.
1-11
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