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 12 of 121
TM 9-2320-285-10
PARKING BRAKE Valve - Pulled out, applies rear spring brakes; pushed in, releases brakes.
Release Bolt - Built into rear axle brake air chambers, provides means for retracting fail-safe spring if air pressure can’t be
restored.
Brake Treadle - Movement of foot pedal on valve controls amount of air pressure delivered to or released from service
brake air chambers, which determines braking force.
Hose Tender - Flexible hoses and quick-disconnect couplings connect tractor brake systems to towed trailer.
1-13.
AIR SYSTEM
Supply Tank - Air enters this tank first.
It allows compressed air from air compressor to cool and water vapor to condense.
This tank includes an automatic drain valve to automatically drain water and a safety valve to vent air to the atmosphere if
air pressure is excessive.
Service Tank - Serves as air reservoir; cool, moisture free air from supply tank is stored in this tank and applied to
pneumatic system components.
A drain cock allows manual draining of water.
Alcohol Evaporator - Distributes alcohol vapor throughout air system to increase operating efficiency in cold weather.
1-12.
BRAKES
1-7
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