MAINTENANCE AND LUBRICATION
4-27
Wheel Bearing Lubrication and
Adjustment
With semitrailer sitting level, the oil level must be checked
daily and maintained between the “ADD” and “FULL”
lines on the hub cap window. Check for cracked windows,
missing filler plugs, and oil leaks. Add hub oil through the
“POP-IN” filler plug located in the center of the hub
windows. Re-install the “POP-IN” plugs after filling each
hub. Adjust wheel bearings and change oil per
or with each brake lining replacement, whichever occurs
first.
Adjustment
1.
With a drain pan under the hub cap, remove the hub
cap assembly allowing oil to drain.
2.
Lift the wheel off of the ground.
3.
Adjust slack adjuster to eliminate brake drag during
tire/wheel rotation.
4.
Remove outer lock nut and inner nut and lock
washer.
5.
Tighten the inner adjustment nut to a minimum of 75
ft.-lbs., while rotating wheel to insure proper seating
of the bearings and cups in the wheel hub.
6.
Loosen the inner adjustment nut so that the wheel
will turn freely.
7.
Retighten the inner adjustment nut to 50 ft.-lbs. while
rotating the wheel, to properly position the bearings
for the final adjustment.
8.
Loosen the inner adjustment nut 1/3 turn.
9.
Install the spindle nut lock washer so that the dowel
on the inner nut will align with a hole in the lock
washer and the washer tang fits in the spindle
keyway.
10. Install the outer lock nut and tighten to 250-300
ft.-lbs. End-play of .001" to .010" must be present in
the adjusted wheel bearing assembly.
DANGER
11. Install the hub cap with a new gasket and fill with oil
to the full mark.
12. Adjust brakes according to
13. Check hub oil level after the wheel has set level in
one position for a few minutes to allow the oil to work
into the bearings.
Failure to torque the outer lock nut properly could
cause the wheel to come off during vehicle
operation resulting in property damage or loss of
life.
Summary of Contents for 425B Series
Page 2: ......
Page 6: ...iv F 543 1011 Edition...
Page 14: ...2 6 F 543 1011 Edition STANDARD SPECIFICATIONS...
Page 26: ...3 12 F 543 1011 Edition OPERATING INSTRUCTIONS Figure 3 7 Steps for Loading and Unloading...
Page 32: ...3 18 F 543 1011 Edition OPERATING INSTRUCTIONS Figure 3 12 Dock Leveler Operation...
Page 61: ...MAINTENANCE AND LUBRICATION 4 21 Figure 4 13 Axle and Brake Assembly...
Page 76: ...4 36 F 543 1011 Edition MAINTENANCE AND LUBRICATION Page Intentionally Blank...
Page 86: ...5 10 F 543 1011 Edition TROUBLESHOOTING GUIDE...
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