COATS 7xxx Series Tire Changer - Manual (Page 26)

22 • Important: Always read and follow operating instructions.
Custom and Special Wheels
CAUTION
Only tire technicians with experience and
training on custom wheels should attempt
to service expensive custom alloy or alu-
minum wheels and high-performance low-
profile tires.
Alloy Wheels
Some manufacturers offer wheels with little or no drop
center. These are not DOT approved. The tire or wheel
- or both - can be damaged and the tire could explode
under pressure , resulting in serious injury or death. Do
not mount/demount this type of wheel (figure 43).
Figure 43 - No Drop Center
European Performance Wheels
(Asymmetrical Hump)
Some European wheels have very large humps except
near the valve hole. On these wheels, the beads should
be loosened at the valve hole on both the upper and
lower sides first (figure 44).
Figure 44 - Asymmetrical Hump on European Wheels
Wheels with Low Pressure Warning Sensors
Performance wheels on some vehicles (including
Corvette, BMW, Lamborghini Diablo) have a pressure
sensor strapped to the rim opposite the valve hole. On
these wheels, the beads should be loosened at the
valve hole on both upper and lower sides first (figure
45).
Figure 45 - Wheels with Low Pressure Sensor
Tube Type Tires
Mounting
1. Avoid pinching or forcing the tube.
2. Apply rubber lubricant to the beads of the tire.
3. Mount the bottom bead.
4. Round out the tube with a small amount of air.
5. Apply rubber lubricant to the tube.
6. Insert the tube into the tire.
7. Mount the top bead.
Demounting
1. After tire beads are loosened, lubricate the beads
and rim liberally.
2. Position demount tool and bead lifting tool as
described in steps 8 through 12 on pages 5 and 6.
Depress table top pedal and rotate only a short distance
at a time. This allows you to stop the process should the
tube get pinched.
3. After upper bead is demounted, remove tube and
demount lower bead.
Do It Now
Make sure the instruction and warning decal
is clean and clearly visible to operator.
No
Drop
Center
Slight
Hump
Large
Hump
Valve Hole
Mounting
Strap
Transmitter
Valve Hole
✔