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Maintenance
PRIOR to doing any repair, inspection, or maintenance work under the trailer:
1. Park the trailer on solid, level ground such as a concrete or paved surface. Place the vehicle in park,
set the emergency brake and use wheel chocks to prevent the vehicle from moving.
2. No work may be done under any vehicle supported only by a hydraulic or mechanical jack.
3. Additional safety devices such as jack stands are required in order to provide extra protection.
Within the first week of operation:
- Retorque outboard arm (outboard arm) bolts to 90-95 ft-lbs
(122-129 N.m).
- Retorque control arm pivot bolts to 430-470 ft-lbs
(583-638 N.m).
- Retorque ALL bolts that are used to mount the hanger to frame (2 vertical bolts & 2 to 3 horizontal bolts)
to 90-95 ft-lbs
(122-129 N.m).
- Lift the trailer, turn wheels individually by hand and make sure they are running smoothly and there is no slack
in the wheels when moved side to side. Tighten hub nut to take the slack out and re-check.
Periodic maintenance (once after 4 months and then every 12 months afterwards or sooner)
Do a complete visual inspection of the suspension / hubs. Inspect all metal components, hangers, control
arms, outboard arm and frame for cracks, deformed surfaces or broken welds. Check the bearings.
Repair or replace according to the manufacturers recommendations.
Check the alignment. Check that all bolts are tightened to a torque specified.
Repack bearings and hubs with new grease. Spinning the bearing during grease application is often
recommended to evenly coat the bearing. Replace grease seals if necessary.
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) Parts of this document regarding the installation and maintenance of hubs are applicable ONLY if hubs are supplied by Timbren Industries Inc.
TIMBREN INDUSTRIES INC. - 1-800-263-3113 - [email protected]
Typical Installation
