TM-9-2320-272-23-5
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 5 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-5 - Page 436 of 623
3.
ENGINE OIL FILTER
a.
Remove filter drain plug, drain oil, and remove filter case assembly (with element) from filter head.
Remove filter element from filter case and inspect for presence of metal particles or water. Discard
element after inspection has been completed. Remove seal ring from filter head and discard. Clean filter
case thoroughly. Check to ensure element end seals are in place and install element over spring support
assembly. Position seal ring on filter head with drain plug pointing down. Tighten center screw 25 to 35
lb-ft (34 to 47 N·m).
b.
M939A2 series vehicle oil filters will be changed only when directed by oil analysis laboratory. Remove
spin-on filter head. Drain oil from filter and observe for metal or water contamination. Discard spin-on
filter. Install spin-on filter. Tighten filter 3/4 turn after seal contacts filter head.
4.
ENGINE FUEL FILTER
Replace every 6,000 mi (9,600 km) or 12 months, whichever occurs first.
5.
CRANKCASE BREATHER
Check crankcase breather and tube every 6,000 mi (9,600 km) under normal operating conditions. When
operating under unusual conditions, check crankcase breather daily.
6.
GEARCASE
Change gear lubricant only when required by maintenance repair action, or if contaminated by water or
other foreign material. Drain only after operation when hot. Place vehicle in level position. Remove drain
and filler plugs from case. If drain plug is magnetic, check for evidence of metal particles. If bits of metal
are seen, notify you supervisor. After draining reinstall drain plugs. Fill axle differentials and transfer case
within 1/2 in. (12.7 mm) of filler plug opening, when lubricant is cold, or to plug level when hot. Fill other
gearcases to plug openings at all times, and install filler plugs. Clean vents after operation in mud
or
water.
7.
FRONT AXLE UNIVERSAL JOINTS AND STEERING KNUCKLE BEARINGS
Every 6,000 mi (9,600 km) or 12 months, whichever occurs first, disassemble and lubricate front axle
shaft and universal joints.
8.
PROPELLER SHAFT UNIVERSAL AND SLIP JOINTS
Every 6,000 mi (9,600 km) or 12 months, whichever occurs first, lubricate using low pressure lubrication
gun until grease is observed coming from all four trunnions. If operating conditions are severe or
abnormal, service at 1,000 mi ( 1,600 km).
9.
STEERING HYDRAULIC SYSTEM
CAUTION
Do not overfill power steering reservoir. Oil will overflow into vent system on the M939A1
or thru vent capon the M939A2.
Reservoir level is checked with engine stopped. If engine is cold, fill until oil is visible on dipstick at mark
designated COLD FULL. If engine has been warmed-up, fill until oil is visible at mark designated HOT
FULL. The steering gear receives lubrication from the power steering pump. If oil in reservoir is
contaminated, notify your supervisor.
TM 9-2320-272-23-5
0820
0820-31
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