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 40 of 926
TM 9-2320-283-20-1
PRINCIPLES OF OPERATION.
1-12.
FUEL SYSTEM (Continued).
a.
Fuel Delivery (Continued).
AIR ACTUATING
TUBE.
Carries pressurized
air from
intake manifold to
air signal attenuator valve.
AIR SIGNAL ATTENUATOR VALVE.
Modifies fuel
flow helping to eliminate noise and exhaust smoke.
Operated by
pressurized air from manifold.
SCREEN
FILTER.
Located in fuel pump.
Provides additional
filtration for fuel prior to entering engine.
MANUAL
OVERRIDE FOR FUEL SHUTOFF SOLENOID.
Normally closed, can be screwed open to allow operation of
engine when solenoid is not working.
CAM FOLLOWER.
Mechanical lever transmits cam lobe movement from camshaft to push rod.
CAMSHAFT.
Determines valve and injector timing.
FUEL RETURN BYPASS TUBE.
Carries excess fuel from fuel pump to fuel tank.
FUEL SUPPLY HOSE.
Carries fuel from fuel tank to fuel pump.
ROCKER ARM.
Transmits directional movement from push rod to injector.
PUSH ROD.
Transmits motion from cam follower to rocker arm.
INJECTOR.
Cam timed
to meter
and inject proper
amount of
fuel into each
FUEL DELIVERY
TUBE.
Carries fuel
under pressure
from fuel
pump
to fuel injectors.
FUEL RETURN TUBE.
Carries excess fuel from injectors back to tank.
1-20
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