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MAINTENANCE AND LUBRICATION
Mounting Tire and Wheel (Hub Type)
1. Make sure that all mounting surfaces are clean and
free of rust, dirt or paint. A wire brush may be used to
clean these surfaces (See Figure 4-21.)
2. Position the inner disc wheel over the studs, being
careful not to damage the stud threads. Make sure
that the disc wheel is flat against the mounting
surface and that there is clearance between the disc
wheel taper and brake drum.
3. Position the outer disc wheel being careful not to
damage the stud threads. Be sure the valve stems for
both the inner and outer tire are accessible.
4. Install the flange nut (pilot mount) and tighten to 50
foot-pounds using the sequence in Figure 4-22.
Then tighten to full torque of 500 to 550 foot-pounds.
5. Torque will drop after the first 50 to 100 miles of
operation. Check the nuts for proper torque after this
interval and retighten them.
Use a torque wrench to assure proper torque.
Insufficient torque can cause stud breakage and
damage wheel pilots. Overtorque can overstress
the studs and strip the threads.
4-30
WARNING
Chain Drive
Inspect the chain drive before and after every usage. If
nicks, kinks, worn spots, breaks or any other sign of
deterioration or damage is found, immediate replacement
is mandatory before further usage. If the semitrailer is
going to be out in the weather for any length of time, it is
advisable to oil the chain drive to prevent untimely rusting
and deterioration of the chain. See Table 4-1 for
lubrication specifications.
Inspect the chain drive mechanism thoroughly each week
to insure safe, efficient operation.
Do not handle the chain drive when the chain
drive is in the engage position. Hands or clothing
could get caught in the chain and be pulled into
the spool causing serious personal injury.
WARNING
F-618-0911 Edition
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