DRIVE UNIT
Drive Unit
108
M3.0-1055-002
07 Rev. 10/09
Drive Tire Replacement
When replacing the drive tire, make sure the composi-
tion and size are such that maneuverability, capacity
and braking are maintained. The drive tire is a "press-
on" type; press the existing tire off the hub and press
on the replacement tire. Do not press hub through old
tire directly into new tire in one operation. This method
is more likely to cause hub misalignment resulting in
premature tire failure. Place new tire on a flat, level
steel plate. This will insure an even distribution of force
and pressure when the hub is pressed into the replace-
ment tire. Apply a light film of oil to the hub before
pressing in replacement tire. The outside of hub must
be pressed flush with the outside edge of tire. It is rec-
ommended that both drive tires be replaced at the
same time to maintain equal tire circumference.
Refer to Control of Hazardous Energy Lockout/Tagout
section for lifting and blocking instructions.
1. Move the truck to a service area with a level floor.
Lower the forks, and chock steer tire.
2. Lift and block truck so drive tires just clear the floor.
3. Remove the five lug nuts and drive tire from the
drive unit.
4. Press existing tire off the hub.
5. Inspect the hub for any damage and replace as
needed.
6. Remove any paint that may be present on tapered
lug seats or on inner hub face that contacts truck
axle.
7. Verify replacement drive tire being installed is of
the correct composition and size. The incorrect
type of tire can affect maneuverability and braking
requirements of the truck. Refer to Drive Unit Parts
for tire part number selection.
8. Press replacement tire onto hub. The outside of
hub must be pressed flush with the outside edge of
tire.
9. Apply anti-seize to lug nut stud and lug nut threads.
For anti-seize part number, refer to One Source
Catalog.
10. Install the tire on the truck and tighten lug nuts by
hand.
11. Torque the lug nuts in sequence per Figure
16098-02.
• First torque sequence value 27 - 54 Nm (20 -
40 ft lb) to seat nuts.
• Second torque sequence value 81 - 102 Nm (60 -
75 ft lb).
• Third torque sequence value 135 - 146 Nm (100 -
108 ft lb).
12. Raise the truck, remove blocking material from un-
der truck and lower to floor.
13. Verify truck is operational.
Figure 16098-02
Crown 2007 PF15706-2 Rev. 10/09
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