TM-9-2320-272-10
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; OPERATOR'S MANUAL
SEPTEMBER 2004
CHANGE 2
TM-9-2320-272-10 - Page 62 of 481
TM 9-2320-272-10
1-45
1-18. POWER SYSTEM OPERATION (Contd)
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.
OIL FILTER
– Filters out foreign particals 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 the oil pump.
OIL BYPASS RETURN LINE
– Returns oil from oil pump to the oil pan.
OIL PUMP
– Provides mechanical pressurization of oil to circulate it through
the oil system.
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