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 114 of 1015
TM 9-2350-272-24-1
Table 2-1. Unit Preventive Maintenance Checks and Services (Contd).
ITEM TO
ITEM
INTERVAL
CHECK/
NOT FULLY
PROCEDURE
MISSION
NO.
SERVlCE
CAPABLE
IF:
22
Semi-
Front
annual
g.
Remove differential fill plug (1) and check oil level
springs,
propeller
in differential (4) every 3,000 mi. (4,800 km) or 3 months,
shaft,
whichever occurs first. Fill if necessary. Level should be
universal
within 1/2 in. (12.7 mm) from hole of fill plug (1) when oil
and slip
is cold, and to the hole of fill plug when hot.
joints,
and axle
(Contd)
EXPECTED TEMPERATURES
LUBRICANTS
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)
Oil, lubricating, multipurpose,
GO-80/90
GO-80/90
(MIL-L-2105): GO-80/90
Oil, lubricating, multipurpose,
(MIL-L-2105): GO-75
GO-75
h.
Inspect differential drainplug (3) and fill plug (1) for
tightness and signs of leakage. Tighten drainplug (3)
35-60 lb-ft (47-81 N·m) and fill plug (1) 80-135 lb-ft
(108-183 N·m).
i.
Inspect differential seals (2) for leaks.
23
Semi-
Underside
a.
Inspect underside of engine for fuel, water, and
annual
of engine
oil leaks.
and trans-
mission
b.
Inspect oil pan and drainplug for leaks. If oil pan is
loose or if leaks are present, tighten oil pan screws
35-40 lb-ft (47-54 N•m). If drainplug is loose or if leaks are
present, tighten drainplug 100 lb-ft (136 N•m) (M939/A1
vehicles), 60 lb-ft (80 N•m) (M939A2 vehicles). Notify your
supervisor if leaks still occur.
c.
Inspect transmission body for cracks or loose bolts that
could cause leaks.
d.
Inspect transmission shift linkage for bends, cracks,
and wear that could cause failure.
e.
Tighten transmission oil pan mounting bolts 5 lb-ft
(7 N•m). Tighten oil pan drainplug 15-20 lb-ft (20-27 N•m).
2-26
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