TM-9-2320-283-20-1
TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1
TECHNICAL MANUAL; ORGANIZATIONAL MAINTENANCE PART 1 OF 3
DECEMBER 1983
TM-9-2320-283-20-1 - Page 86 of 926
TM 9-2320-283-20-1
PRINCIPLES OF OPERATION.
1-19.
COMPRESSED AIR SYSTEM.
This paragraph provides information on components of the compressed air system.
For information on the brake system,
refer to paragraph 1-20.For information on the auxiliary air-powered systems, refer to paragraph 1-21.
For a complete air
system diagram, refer to Appendix D (TM 9-2320-283-20-3).
ACCESSORY
DRIVE.
Driven by camshaft gear.
Provides power to operate air compressor.
AIR COMPRESSOR.
Draws air from air aftercooler, compresses it, and directs it to the air dryer.
AIR COMPRESSOR
GOVERNOR.
Opens unloading valve to prevent further air compression when air pressure reaches
125 psi.
Closes unloading valve to begin air compression when air pressure falls below 100 psi.
CHECK VALVE(S).
One way valve(s) prevent air from flowing out of primary or secondary reservoirs back to supply
reservoir.
PRIMARY RESERVOIR.
Receives compressed air from supply reservoir and stores it for use in brake system.
(Refer to
para 1-20).
DRAINCOCK(S).
Used
to drain compressed air and moisture from primary, secondary, and supply reservoirs.
QUICK DISCONNECT COUPLER.
Used in conjunction with tire inflation air hose and chuck.
AUTOMATIC DRAIN VALVE.
Automatically ejects moisture and contaminants from supply tank.
Each time brake is
applied, a pressure drop occurs in the supply tank, causing drain valve to open momentarily.
AIR DRYER.
Collects and removes moisture and contaminants before air reaches supply reservoir.
Provides "dry air" for
air brake system.
SUPPLY RESERVOIR.
Receives compressed air from air dryer and supplies it to primary and secondary reservoirs.
SAFETY VALVE.
Vents air when pressure in supply tank rises above 150 psi.
SINGLE CHECK VALVE.
One-way check valve prevents air from flowing
out of supply reservior back to air compressor.
DOUBLE CHECK VALVE.
One-way check valve prevents air from flowing
out of primary reservoir or air manifold back to
secondary reservoir.
SECONDARY
RESERVOIR.
Receives compressed
air from supply reservoir and supplies it to auxiliary air-powered
systems and brake system.
1-66
Back to Top
