9. Inspect the lubricant for discoloration. Under nor-
mal conditions, the lubricant will darken; a white
or milky appearance indicates water contamina-
tion. If the lubricant is discolored, service the
wheel end. See the 108SD and 114SD Work-
shop Manual and manufacturer literature for pro-
cedures.
IMPORTANT: Do not mix different types of lubri-
cants.
10. Inspect the lubricant for the presence of foreign
matter. Use a magnet to detect any metallic ma-
terials present in the lubricant. If the lubricant is
contaminated, service the hub. See the 108SD
and 114SD Workshop Manual and manufacturer
literature for procedures.
11. Rotate the hub and check for free, smooth, and
quiet rotation. If rotation is hampered or rough, or
any unusual noise is heard, service the hub im-
mediately. See the 108SD and 114SD Workshop
Manual and manufacturer literature for proce-
dures.
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.
12. Using a dial indicator, measure the end play as
follows.
12.1 Attach the magnetic base of a dial indica-
tor to the spindle, and place the measur-
ing end of the indicator squarely against
the flange as shown in
Fig. 7.
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.
12.2 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.
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.
07/05/2011 f350538
1
2
1. Dial Indicator (with magnetic base)
2. Axle Shaft Mounting Flange
Fig. 7, Dial Indicator Setup
Rear Axle35
108SD and 114SD Maintenance Manual, November 201635/8
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