COATS 7xxx Series Tire Changer - Manual (Page 8)

4 • Important: Always read and follow operating instructions.
Operating Instructions
This unit must be properly operated and properly
maintained to help avoid accidents that could injure
the operator or bystanders, or damage the unit. This
section of the Operating Instructions manual review
basic operations and use of controls. These instructions
should be reviewed with all employees before they are
allowed to work with the machine. Keep these instruc-
tions near the machine for easy reference.
Tire Bead Loosening and Demounting
CAUTION
This machine may operate differently from
machines you have previously operated.
Practice with a regular steel wheel and tire
combination to familiarize yourself with the
machine’s operation and function.
A. Remember to remove all weights from both sides
of the wheel. Weights left on backside of wheel
may cause the wheel to be clamped unleveled.
This may result in the combination mount/demount
tool contacting the rim causing scratches. On alloy
wheels, always rotate the wheel one turn after set-
ting the Duckhead mount/demount tool to insure
proper wheel clamping.
B. Always review with the owner any nicks and
scratches on expensive wheel and tire combina-
tions prior to servicing.
C. Review the performance wheel section of this
manual prior to servicing performance tire/wheel
combinations.
CAUTION
Loosening the beads on a partially or fully
inflated tire is unsafe and causes excess
movement and friction against the bumper
pads and excessive wear on pivots. Deflate
the tire completely to prolong the life of
your machine.
1. Deflate the tire completely by removing the valve
core from the valve stem (figure 1). Be cautious and
do not smoke as a flammable gas could have been
introduced into the tire at some time.
Figure 1 - Remove Valve Core to Deflate Tire
CAUTION
Tires are always installed and removed from
the rim’s narrow side.
D. Always loosen the bead on the narrow side of
the wheel’s drop center first (tire removed in figure
2 for clarity).
Figure 2 - Determine Narrow Side of Wheel
E. The clamps on the table top may extend beyond
the table top itself. To avoid damaging the clamps,
move them to their full inward position before
positioning a tire for bead loosening.
F. Use extra care in positioning the bead loosener
shoe on larger wheels/tires, and on alloy wheels.
Make sure the shoe rests next to but not on the
rim, and not on the tire sidewall.
2. Actuate valve (or pull) to position the bead loosener
shoe away from the machine and roll wheel into posi-
tion. The valve stem should be in the 2 o’clock position
to accommodate a possible asymmetric safety hump
type rim. Position the bead loosener shoe against
the tire next to, but not on, the rim. Actuate the bead
loosener handle/button to position the shoe or press the
bead loosener pedal to position the shoe and loosen
the bead. It may be necessary to loosen the bead in
multiple locations around the tire (figure 3).
Narrow Side
Drop Center
Long Side