Freightliner Century Class. Manual - part 21
3.
Rotate the tire and hub assembly. They should
rotate smoothly and without noise. Grasp the
brake chamber while rotating the hub to detect
any hub vibration.
If the hub rotates smoothly, go to the next step.
If the tire and hub assembly do not rotate
smoothly, or you hear noise during rotation, go to
"End-Play Check, Meritor Unitized Wheel Ends."
4.
Grasp the tire and hub assembly at the 3 o’clock
and 9 o’clock positions. Using about 50 pounds
(23 kg) of force, check for vertical and horizontal
movement.
5.
If no movement or looseness is detected, raise
the vehicle to remove the safety stands, lower
the vehicle, and remove the chocks from the
tires.
If any movement or loosenes is detected, go to
the next step.
6.
Check the wheel-to-hub mounting. Make sure the
wheel and tire assembly is mounted correctly
and that all the hardware is secure.
7.
Apply the service brakes to lock the hub and
axle spindle together. Check again for movement
and looseness.
If movement is detected, the king pin or king pin
bushings are probably worn.
If applying the service brake eliminates the
movement, the problem is probably caused by
incorrect wheel bearing end play. Go to "End-
Play Check, Meritor Unitized Wheel Ends."
33–08 End-Play Check, Meritor
Unitized Wheel Ends
1.
Park the vehicle on a level surface, set the park-
ing brakes, shut down the engine, and chock the
rear tires.
2.
Remove the hub cap.
3.
Raise the vehicle until the front tires are clear of
the ground. Support the vehicle with safety
stands.
WARNING
Never work under a vehicle that is supported only
by a jack. Jacks can slip, causing the vehicle to
fall. This could result in serious injury or death.
4.
Remove the tire and wheel assembly.
NOTE: It is normal for small amounts of grease
to be visible around the inner and outer wheel
bearings.
5.
Remove the brake drum. If needed, back off the
slack adjuster.
6.
Attach the magnetic base of a dial indicator to
the end of the axle spindle.
7.
Touch the dial indicator stem to the surface of
the hub, making sure the stem is perpendicular
to the surface of the hub.
8.
Set the dial indicator to zero.
9.
Without rotating the hub, grasp it at the 3 and 9
o’clock positions, and push it straight in. Note the
reading on the dial indicator.
Pull the hub straight out. Note the reading on the
dial indicator.
The difference between the two measurements is
the end play.
10. If the end play is less than 0.003 inch (0.08 mm),
go to the step for installing the hub cap.
If the end play is 0.003 inch (0.08 mm) or
greater, go to the next step.
11. Remove the outer locknut and tabbed washer
from the axle spindle.
12. Loosen, but don’t remove, the inner locknut.
13. While rotating the hub a minimum of five rota-
tions, tighten the inner locknut 600 lbf·ft (813
N·m).
14. Install the tabbed washer and the outer locknut.
Tighten 250 lbf·ft (339 N·m).
15. Repeat the procedure for checking the end play.
16. If the end play is greater than 0.003 inch (0.08
mm) but less than 0.006 inch (0.15 mm), record
it in the vehicle maintenance log. Go to the next
step.
If the end play is 0.006 inch (0.15 mm) or
greater, replace the entire wheel end assembly.
Front Axle
33
33/4