Lippert Components Sealed Bearing System - Manual (Page 2)

2. Confirm wheel end clearance. Pull tire assembly forward and push assembly away from
you. A small amount of end play is acceptable.
3. Spin tire slowly forwards and backwards. Wheel assembly must turn freely and
smoothly.
4. Excessive wheel end play, restricted rotation, noise, or erratic rotation must result in
replacing the bearing unit.
5. Inspect bearing units every year or 12,000 miles, whichever comes first.
NOTE: A small amount of grease weeping from the seal area is normal. Excessive leakage
indicates abnormal bearing operation.
SBS
TM Bearing End Play Inspection
The following chart shows maximum axial end play for each of the sizes of SBS TM bearings and the
amount of tilt that results. Since there are a large number of wheel and tire combinations used on
trailers, the tilt is expressed in inches per inch. The movement as measured at the tire tread can be
found by the following method:
Example: If the tilt value is shown as .003” per inch and the tire measures 30” in diameter,
simply multiply .003” X 30” =.09” which is the total expected movement at the tires’ outer diameter.
Bearing Size End Play Resultant tilt value
35 MM .005” axial .003”/in.
42 MM .006” axial .005”/in.
50 MM .008” axial .004”/in.
Important: Most mounted tires will deflect when enough hand pressure is applied while shaking the
tire. Excessive pressure will result in the perception that the bearings’ tilt is greater than it actually is.
The same occurrence will appear when checking any wheel end, including those with conventional
bearing sets.
Hub Installation
1. Clean and inspect spindle shaft and apply a light coat of anti-seize lubricant to the
spindle shaft before reassembling drum.
2. Install drum assembly onto spindle (DO NOT FORCE!).
3. Install steel washer onto spindle end.
4. Thread self-locking nut onto spindle thread by hand. Finish installation using a 1 1/2”
or 1 7/16” socket and torque to 170-180 lb-ft. (this torque will set the internal bearing
adjustment, no other adjustments need to be made).
5. Reinspect assembly for excessive end play, noise and rotation restriction prior to
remounting wheel end hardware.
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