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Lubrication
Note on lubrication
Use a standard, LP-2 chassis grease for all for all lubrication points having fittings. Apply grease with a
suitable pressure type grease gun that fits the lubrication fittings. The gun may need a flexible extension on it to
enable you to reach certain fittings.
Clean each fitting and wipe off old accumulated grease before applying fresh lubricant.
When old grease is forced from the joint, the part has been adequately lubricated. Replace faulty or broken
lubrication fittings. Use rags to clean all lubrication fittings before applying lubrication. The person doing the
lubricating has an opportunity to inspect parts of the vehicle, which are relatively inaccessible. Any noticeable
leaks of grease, excessive rusting of the chassis parts, broken, bent or damaged bolts and brackets, or other
defective members should be reported for corrective action.
Wheel bearings and hubs
The wheel bearings on your semi trailer are oil lubricated. Oil lubricated bearings do not normally require
service as they are continually lubricated.
Pratt
recommends a visual inspection of the lubricant every 1,000
miles.
Change when oil becomes contaminated, seals are replaced, new brake lining is installed, or once a year. To
check the lubricant level, make sure the trailer is on level ground. Wipe the hubcap clean with a rag and
inspect the lubricant level. The hub should be filled with all-weather oil SAE 80W-140 (or equivalent) to the
level indicated by a mark on the hubcap. MINIMUM LEVEL ALLOWABLE - 1/4-inch mark. If the lubricant level
is low, remove the center plug and add oil to proper level. DO NOT OVERFILL.
Landing gear [two speed)
Under normal operation conditions, your landing gear should never require lubrication. However, grease
zerks are provided in the leg and the gearbox housing if necessary.
Brake camshafts
Lubricate the brake camshaft bearings with chassis grease. There are four fittings located on each axle.
Brake shoes
When brakes are relined, apply an even coat of lubricant or equivalent between contact face of anchor pin
brushing, brake shoe area, and spider faces. Coat anchor pin completely. Wipe off all excess grease.
Brake roller and cam heads
When the wheels and hubs are removed, place a light film of lubricant on CAM roller follower shafts,
journals, and the top and bottom surface of the S-cam.
Suspension
Suspensions used by
PRATT
do not require lubrication. Refer to the suspension specification sheet provided
by the manufacturer for details on the correct maintenance of your suspension.
Check the fifth wheel locking jaws or hook (depending upon the model) and support brackets for lubrication
fittings and lubricate as required.
Hydraulic oil reservoir
Whenever the hoist is lubricated, the condition and level of the oil in the reservoir tank should be checked.
Dirty oil is the main cause of expensive pump and cylinder repairs. Dirty oil is detectable and should be
replaced before considerable damage is done to the system. A sample from a dipstick will show its condition.
Place a drop of the sample on a blotter, cloth or paper. Any noticeable residue means dirty oil.
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