TM-9-2320-272-24-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4
JUNE 1998
TM-9-2320-272-24-1 - Page 45 of 1015
TM 9-2320-272-24-1
1-21. POWER SYSTEM OPERATION (Contd)
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Item and Function
RAIN CAP
- Prevents rain and large objects from entering air intake system.
AIR INTAKE EXTENSION TUBE
- Routes air to air intake system. Can be removed for shipping.
STACK-TO-AIR INTAKE EXTENSION TUBE
- Routes air to air cleaner and is high enough to
keep intake opening above fording level.
STACK-TO-AIR CLEANER ELBOW
- Flexible connection between air stack and air cleaner.
AIR CLEANER
- Filters dirt and dust from air.
HUMP HOSE
- Flexible connection between air cleaner and air cleaner outlet tube.
AIR CLEANER OUTLET TUBE
- Routes air from air cleaner to intake manifold.
INTAKE MANIFOLD
- Distributes air to combustion chambers in each cylinder head (M939/Al
series only).
AIR CLEANER INDICATOR
- Shows red when engine air filter needs servicing.
TURBOCHARGER
- Mounts on exhaust manifold and uses spent exhaust gases to drive impeller
and pressurize air entering aftercooler (M939A2 series only).
AFTERCOOLER
- Distributes compressed air from turbocharger to combustion chambers while
cooling air intake out of turbocharger (M939A2 series only).
1-35
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