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 120 of 1015
TM 9-2320-272-24-1
Table 2-1. Unit Preventive Maintenance Checks and Services (Contd).
ITEM TO
ITEM
INTERVAL
CHECK/
NOT FULLY
PROCEDURE
MISSION
NO.
SERVICE
CAPABLE IF:
31
Semi-
Transmis-
CAUTION
annual
sion and
transfer
• Do not remove transmission dipstick before
case
cleaning dirt away from access plate, filler tube,
(Contd)
and dipstick. Dirt may enter and damage
transmission.
• Do not overfill transmission. Internal
transmission component damage will result.
• Change transmission oil when contamination by
fuel, water, or other foreign materials is evident.
Failure to do so may result in failure of internal
transmission components.
NOTE
When AOAP laboratory support is not available,
change transmission oil every 24,000 mi. (38,000 km)
or 24 months, whichever occurs first.
a.
On M939A2 series vehicles, inspect transmission
dipstick and oil.
1.
Check for evidence of metal particles. Notify
your supervisor if metal particles are found.
2.
Check for evidence of dilution by coolant. If oil is
diluted by coolant, refer to para. 2-21, mechanical
troubleshooting.
3.
Check oil level in transmission. If oil levels are
excessive, drain excess (para. 3-133).
LUBRICANTS
OE/HDO
Lubricating oil, internal
combustion engine
(MIL-L-2104)
OEA
Lubricating oil, internal
combustion engine (arctic)
(MIL-L-46167)
EXPECTED TEMPERATURES
ABOVE 15°F
+40°F TO -15°F
+40°F TO -65°F
(ABOVE -9°C)
(+4°C TO -26°C)
(+4°C TO -54°C)
OE/HDO 30
OE/HDO 10
OEA
b.
Inspect transmission oil lines, hoses, and fittings for
loose connections, cracks, frays, wear, and damage that
could cause leaks. Tighten loose connections, or notify
DS maintenance if any oil line, hose, or fitting is cracked,
frayed, worn, or damaged and could cause leaks.
c.
Inspect transmission oil filter housing for security of
mounting. Ensure spin-on oil filter is tight. If spin-on oil
filter is loose, hand-tighten, then tighten an additional
3/4 turn by hand. If leak continues, replace filter
(para. 3-139).
2-32
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