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B
7. Demounting a tyre
Demounting a tyre is much easier if, before
demounting, a commercial lubricant is applied to
the bead and the rim fl ange over which the bead
will be demounted. Never use other products which
its is only assumed have a lubricating action!
• Rotate or adjust the clamped wheel (1, Fig. 17) so
that the wheel valve is approx. 10 cm in front of
the mounting/demounting tool (Fig. 16).
• Depress the pedal (2, Fig. 17) to tilt the tower
into the operating position.
• Check the mounting/demounting tool setting and/
or adjust it as described in Chapter 5. Adjusting
the mounting/demounting tool.
• Lift the upper bead over the mounting/demounting
tool tip with the tyre lever (arrow, Fig. 16).
• To facilitate lifting, press the upper tyre bead
down on the opposite side to the mounting/
demounting tool and push it into the rim drop
base (arrow, Fig. 18 A).
• Depress pedal (1, Fig. 17) to start turntable
rotation.
• Leave the tyre lever on the mounting/demounting
tool arm and press against the latter (arrow, Fig.
16) until part of the tyre bead has gone over the
rim fl ange.
• Remove the tyre lever and rotate the turntable
further.
• Continuing the demounting, make sure the part of
the tyre bead opposite the mounting/demounting
tool is in the drop base and avoid excessive bead
tension (arrow, Fig. 18 A).
• If the turntable stops as a result of excessive
bead tension, turn the turntable backwards
by lifting up the pedal and pressing the bead
opposite the mounting/demounting tool as far
as possible into the drop base, then continue
demounting.
• In case of tyres with inner tubes, remove the tube
before demounting the lower bead.
• To demount the lower tyre bead, push the part of
the bead opposite the mounting/demounting tool
into the drop base and lift the tyre directly under
the mounting/demounting tool (Fig. 18 B).
• Then proceed with demounting as described
for the upper bead, with the bead always going
correctly over the beak-shaped tool (arrow, Fig.
18 B).
• When the tyre has been demounted (2, Fig. 17),
depress the pedal to tilt the tower backwards.
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