TM-9-2320-272-23-2
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 2 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-2 - Page 1023 of 1417
DEPRESSURIZING SYSTEM
WARNING
Care should be taken when removing surge tank filler cap. Steam or hot coolant under
pressure may escape rapidly or cause burns. Failure to comply may result in injury or death
to personnel.
If engine is hot, place thick cloth over cap and turn cap to first stop. Wait until pressure has escaped then
remove cap from surge tank.
END OF TASK
DRAINING SYSTEM
NOTE
•
Have drainage container ready to catch coolant.
•
Use drain pans to retain leaking/draining fluids. Refer to local procedures and plans for
preventing and responding to fluid spills or leaks. Comply with local regulations when
disposing of clean up material and leaked and spilled fluids.
1.
Remove cap (Figure 1, Item 1) from surge tank (Figure 1, Item 2) and open drain valve on radiator
(Figure
1,
Item
3) and allow system to drain.
NOTE
Open drain valve on aftercooler to permit cooling system to fully drain.
2.
Open aftercooler drain valve (Figure 1, Item 4) on M939A2 series vehicles and allow cooling system to drain.
TM 9-2320-272-23-2
0287
0287-2
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