Warning, Caution – COATS 5040 A/E Tire Changer User Manual

Page 18

14 •

Important: Always read and follow operating instructions.

Performance, Custom, and

Aluminum Automotive & Light

Truck Wheels

WARNING

To avoid personal injury or finish damage
to components only tire technicians with
experience 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.

CAUTION

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 serviced.
For further information on these devices,
contact the individual sensor manufacturer.

Pre-Operation Notes:

• Ensure all weights have been removed.
• Assistance will be required on wide and large

diameter 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.

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 21).

Figure 21 - Rim with a Valve Type Sensor (Tire Removed for
Clarity)

Some wheels have a low-pressure sensor/trans-

mitter strapped to the wheel. This is especially true on

older run-flat tire/wheel systems. To avoid damaging the

sensor, 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 22).

Figure 22 - Wheel with Strapped on Low Pressure Sensor/
Transmitter

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 and bead loosen (Figure 23).

Figure 23 - Asymmetrical Hump Wheel

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/mounting side of the

wheel first (figures 4 and 24).

Figure 24 - Position Tire for Bead Loosening

Ledge
Hump Rest
of Wheel

Smooth
Hump At
Valve Stem

Valve Stem

Sensor