Demounting A Tyre - John Bean T5540 Série Manuel D'utilisation

21
2
1
22
A
B
23
38
7.

Demounting a tyre

Always observe WdK or applicable national
guidelines when demounting tyres.
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
it is only assumed have a lubricating action!
• Rotate or adjust the clamped wheel (1, Fig.22) so
that the wheel valve is approx. 10 cm in front of the
mounting/demounting tool (Fig. 21).
• Depress the pedal (2, Fig.22) 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 (Fig. 21, arrow).
• 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 (Fig. 23A, arrow).
• Depress pedal (1, Fig.22) to start turntable rotation.
• Leave the tyre lever on the mounting/demounting
tool arm and press against the latter (Fig. 21,
arrow) 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 (Fig. 23A, arrow).
• 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. 23B).
• Then proceed with demounting as described for the
upper bead, with the bead always going correctly
over the beak-shaped tool (Fig. 23B, arrow).
• When the tyre has been demounted (2, Fig.22),
depress the pedal to tilt the tower backwards.