Demounting Tyres; Bead Breaking On Disc - Snap-On ATC 970S Manual De Instrucciones

5.2-1
5.2-1b
A
B
5.2-2
5.2-3
11
5.2-4
Operations
1
5 3
1
6 4
5.2

Demounting tyres

Figure 5.2-1
• Remove all wheel weights from the rim. Remove
the valve and defl ate the tyre.
sure that the lower bead mounting tool is in rest

5.2.1 Bead breaking on disc

Upper Bead Breaking
First of all the Bead Breaker Disc must be placed in
the correct position.
Proceed as follows:
Figure 5.2-2
• Use handle 1, Figure A to move the Upper Bead
Breaker Disc in position on the tyre bead, close to
the contact area with the rim.
The lower Disc automatically starts the movement,
until it reaches the corresponding position of the Upper
Disc (Figure B).
• Wait for the corresponding acoustic signal to go off.
• Check arm alignment through the viewer (11,
Fig.5.2-4).
• Activate control (5, Fig.5.2-4) to lock both Bead
Breaker arms.
Note: The actual stop of the arms occurs only
when the Slave arm (Figure B) reaches
its fi nal position, even if the lock control
has been previously activated.
• Activate rotation and lubricate in the bead breaking
area Figure 5.2-3.
• Lower Disc (Control 3, Fig. 5.2-4) by exerting
moderate pressure to move the bead just slightly
away from its seat on the rim.
Note: Proceed with rotation and lubrication so
that the solution penetrates as much as
possible between tyre and rim Figure
5.2-3.
• Gradually lower the Bead Breaker Disc, ensuring
that rotation continues, until the bead has been
moved completely away from its seat in the direction
of the rim drop centre.
WARNING: IF NECESSARY, BEAD BREAKING CAN
BE AIDED BY USING THE VARIATION CONTROL OF
THE BEAD BREAKER DISC PENETRATION ANGLE
Make
position (Fig.5.2-1b).
EN - 29