freightliner 108SD 2021, Driver Manual

Page: 93 / 191

WARNING
Correct wheel-bearing end play is crucial to the
safe and sound operation of the vehicle. If the end
play is not correct, the wheel bearings could fail
and cause the loss of the wheel and hub assem-
bly and result in an accident causing property
damage, serious injury, or death. Use a dial indica-
tor to measure the end play.
IMPORTANT: Do not measure the wheel bear-
ing end play with the wheel mounted on the
hub; you cannot accurately measure or adjust
bearing end play with the wheel mounted on the
hub. Also, ensure that the brakes are not ap-
plied so that that drum and hub can move freely.
11. Using a dial indicator, measure the end play as
follows.
11.1 Attach the magnetic base of a dial indica-
tor to the end of the spindle, and place
the measuring end of the indicator
against the hub cap mounting flange. See
Fig. 11 .
IMPORTANT: Maintain continual pressure on
the hub until you have taken both the in-
board and outboard measurements. If you
release the hub, an accurate measurement
is not possible.
11.2 To seat the bearings, grip the hub at the
three o’clock and nine o’clock positions,
and push inward while oscillating it ap-
proximately 45 degrees. Maintain pres-
sure on the hub, note the inboard mea-
surement, and then pull the hub outward
while oscillating it as before. Maintain
pressure on the hub, and note the out-
board measurement. See
Fig. 12 .
The end play is the difference between
the two measurements. The end play limit
for PreSet hubs is 0.006 inch (0.15 mm);
for non-PreSet hubs the acceptable range
is 0.001 to 0.005 inch (0.03 to 0.13 mm)
inclusive.
If the end play does not exceed the limit
and no other problems were found in the
previous steps, no additional service is
necessary. If the end play exceeds the
limit, service the hub. See the
108SD and
114SD Workshop Manual and manufac-
turer literature for procedures.
06/20/2011 f330270
1
2
1. Hub Cap Mounting Flange
2. Dial Indicator (with magnetic base)
Fig. 11, Dial Indicator Setup
06/21/2011 f330271
A
A
A. Pull and push the hub while oscillating it.
Fig. 12, Measuring End Play
Front Axle
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108SD and 114SD Maintenance Manual, May 2017
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