LO-9-2320-260-12
TRUCK, CHASSIS: 5-TON, 6X6, M809 SERIES
LUBRICATION ORDER
NOVEMBER 1983
LO-9-2320-260-12 - Page 28 of 33
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NOTES (Cont’d)
ENGINE OIL FILTER
Oil filter will be changed only when directed by oil analysis laboratory. 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 new element
over spring support assembly. Position new seal ring on filter head with drain plug pointing
down. Tighten center capscrew 25-35 Ib-ft (34-47 N•m). (Follow procedure outlined in NOTE 2).
ENGINE FUEL FILTER
Replace every 3,000 miles (4,800 kilometers) or 3 months, whichever occurs first.
CRANKCASE BREATHER
Check and clean crankcase breather and lines every 6,000 miles (9,600 kilometers) under
normal operating conditions.
GEAR CASE
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, and after draining reinstall drain plugs. Fill
axle differentials, transfer, transmission, and power divider (M816 wrecker), within 1/2 inch
(12.7 millimeters) of filler plug opening, when lubricant is cold, or to plug level when hot. Fill
other gear cases to plug openings at all times, and install filler plugs. Clean vents after
operation in mud or water.
FRONT AXLE UNIVERSAL JOINTS AND STEERING KNUCKLE BEARINGS
Every 12,000 miles (1 9,000 kilometers) or 12 months, remove plug from universal joint housing,
fill to level of plug opening, reinstall plug. Do not disassemble C.V. joints.
PROPELLER SHAFT UNIVERSAL AND SLIP JOINTS
Every 3,000 miles (4,800 kilometers) or 3 months, whichever occurs first, on universals equipped
with plugs, remove filler plugs and install pressure fittings; lubricate using low pressure
lubrication gun. If operating conditions are severe or abnormal, service at 1,000 miles
(1,600 kilometers).
STEERING HYDRAULIC SYSTEM
Fill until oil is visible in sight glass window of reservoir while engine is stopped. The steering gear
receives lubrication from the power steering pump.
BRAKE MASTER CYLINDER
CAUTION
Use only brake fluid silicone (MIL-B-46176).
Check level weekly. Fill to 1/2 inch (12.7 millimeters) from top of master cylinder. Use
BFS (MIL-B-46176) for brake master cylinder.
TA 255969
LO 9-2320-260-12
PAGE 28 OF 31
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