Bead Breaking; Deciding From Which Side Of The Wheel The Tyre Must Be Demounted; Special Instructions - Mondolfo Ferro As 933 Uso Y Mantenimiento

ATTENTION
During this stage of operations noise levels may be up to 85 dB(A). We recommend that
operators wear hearing protectors.

Deciding from which side of the wheel the tyre must be demounted

Fig.9
A Narrow side - Side for mounting the tyre
B Rim channel
C Wheel
D Wider side - You cannot mount tyres from this side
The two sides may be almost identical, but only the narrow side serves for tyre mounting and demounting
Identify the side for tyre mounting and make sure that this side is facing upward when you install the tyre on the table
top (i.e. facing toward the mount/demount head)
Alloy wheels
Some alloy wheels on the market have minimal rim channels or are even completely without rim channels (these
wheels are not DOT approved).
Fig.9a
A No rim channel
DANGER
When working these wheels it is possible to damage the tyre, the rim or both, with the risk of the
tyre exploding under pressure causing serious injury or death. When mounting tyres on this type
of wheel, use the utmost caution.
European style high performance wheels (asymmetrical curvature)
Some European wheels have very pronounced curves on the rim edge, except in the area of the valve hole. On this
type of wheel bead breaking must be performed in correspondence with the valve hole and on the lower and upper side
of the wheel.
Fig.9b
A Valve hole
B Slight curvature
C Pronounced curvature
Wheels for Corvette, BMW, Lamborghini and other wheels with "Low pressure indicator system"
Some types of high performance wheels are equipped with a pressure transmitter secured to the rim with a belt on the
side opposite the valve hole. On this type of wheel bead breaking must be done initially in correspondence with the
valve hole, on both sides of the rim.
Fig.9c
A Valve hole
B Transmitter
C Attachment belt
Fully deflate the tyre, removing the valve
-
- Adjust the aperture of the bead breaker shoe by turning the screw on the cylinder rod (fig.10, except for AS 933).
- Position the wheel as shown in fig.11 and bring the bead breaker shoe to the edge of the rim.
IMPORTANT: During the bead breaking operation, you are advised to keep the table top closed (locking clamp towards center) (A fig.11).
- Press the pedal 10 (fig.11) to operate the bead breaker and detach the bead from the rim.
Repeat this operation on the other side of the wheel.
It may be necessary to break the bead at several points to free it completely.
After detaching the beads, remove the old balancing weights.
- Thoroughly lubricate the sides of the tyre around the entire circumference of the lower and upper bead to facilitate the
demounting and avoid damaging the beads (fig.12).
- Tilt the tower backwards by holding the button in the "unlocked" position (on the A 2005, keep the lever locked)
(fig.13).
- Set the clamps to the open or closed position (fig.14-14b).
Place the wheel on the table top (with the narrow part of the rim structure facing upwards), push lightly downwards
and use the control pedal to lock the wheel in position (fig.13).
- Tilt the tower forward again (fig.15). Release the locking button (release the lever on the A 2005) to free both the

BEAD BREAKING

Special instructions

Bead breaking
31