COATS 9024E Tire Changer - Manual (Page 18)

14 • Important: Always read and follow the operating instructions.
Performance, Custom,
and Aluminum Wheels
To avoid personal injury or damage to com-
ponents only tire technicians with experi-
ence and training on custom wheels should
attempt to service expensive custom alloy
or aluminum wheels, high-performance
low-profile tires and EMT/run-flat tires.
Many tires/wheels have pressure sensor
devices that are manufactured by different
companies, there are no standards on type
or mounting; therefore, follow the instruc-
tions that apply to the sensor being serv-
iced. For further information on these
devices, contact the individual sensor man-
ufacturer.
Pre-Operation Notes:
• Ensure all weights have been removed.
• Assistance will be required on wide wheels.
• Clamp wheel from the outside.
• Use ample lubricant for mounting and demounting
• Always review wheel nicks and/or scratches with
the owner before servicing.
Performance Tires & Wheels • Demounting
Follow these instructions for performance type tires
and wheels, including run-flat tires and their associated
wheels, and asymmetrical hump wheels.
1. Remove the valve core and completely deflate the
tire. On many performance wheels a valve type sensor
may be inside of the rim. These devices are expensive
and should be serviced with care. After deflating the
tire, loosen and remove the retaining nut and then tap
lightly with a hammer to allow the valve sensor to fall
inside the tire before further service work (figure 24).
Figure 24 - Rim with a Valve Type Sensor (Tire Removed for
Clarity)
2. Some wheels have a low-pressure sensor/trans-
mitter strapped to the wheel. This is especially true on
run-flat tire/wheel systems. To avoid damaging the sen-
sor, always loosen the top bead with the valve stem at
the 2 o’clock position first, to determine sensor loca-
tion. Then loosen the bottom bead and the remaining
circumference of the beads as necessary at a location
that will not damage the sensor. (Figure 25).
Figure 25 - Wheel with Strapped on Low Pressure
Sensor/Transmitter
3. Wheels with an asymmetrical hump have a larger
"ledge" type hump around the wheel except at the
valve hole making them more difficult to mount and
demount loosen bead (Figure 26).
Figure 26 - Asymmetrical Hump Wheel
4. Pull the bead loosener shoe away from the
machine and roll the tire in position with the valve stem
in the 2 o’clock position (above the bead loosener
shoe). Always loosen the bead on the narrow/mount-
ing side of the wheel first (figures 2 and 27).
Figure 27 - Position Tire for Bead Loosening
CAUTION
CAUTION
Smooth
Hump At
Valve Hole
Ledge
Hump Rest
of Wheel
Valve Stem
Sensor
Valve Stem