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 53 of 1015
TM 9-2320-272-24-1
1-21. POWER SYSTEM OPERATION (Contd)
M939/A1 SERIES
M939A2 SERIES
Key Item and Function
1
2
3
OIL DIPSTICK
- Indicates engine oil level.
CRANKCASE BREATHER
- Vents hot engine oil fumes from engine and allows fresh air to enter.
ENGINE OIL COOLER
- Removes heat from engine oil as coolant circulates through internal tubes
of oil cooler.
4
5
6
7
8
9
10
11
OIL FILTER
- Filters out foreign particles suspended in oil.
OIL FILLER CAP
- Located on rocker lever cover, cap covers engine oil fill opening.
OIL PRESSURE TRANSMITTER
- Sends an electrical signal that indicates engine oil pressure to
gauge on instrument panel.
OIL PAN DRAINPLUG
- Plugs engine oil drain opening.
OIL PAN
- Reservoir for engine oil.
OIL SUPPLY LINE
- Carries oil from oil pan to oil pump.
OIL BYPASS RETURN LINE
- Returns oil from oil pump to oil pan.
OIL PUMP
- Provides mechanical pressurization of oil to circulate it through oil system.
1-43
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