INSTRUCTION, USE AND
MAINTENANCE MANUAL
GB
Page 33 of 98
12.7 Tyres with inner tube
12.7.1 Bead breaking
REMOVE THE LOCK NUT OF THE
INNER TUBE VALVE TO ALLOW
ITS EXTRACTION DURING TYRE
REMOVAL PHASES; REMOVE
THE NUT WHEN DEFLATING THE
TYRE.
The beading procedure is the same one described for
tubeless tyres.
WHEN BEADING WHEELS WITH
INNER TUBES, INTERRUPT THE
FORWARD MOVEMENT OF THE
BEADING DISC AS SOON AS THE
BEADS HAVE BEEN DISLODGED
TO AVOID DAMAGE TO THE IN-
NER TUBE OR TO THE VALVE.
12.7.2 Demounting
THROUGHOUT TYRE MOUNT-
ING/DEMOUNTING OPERATIONS,
CHECK THAT THE SELF-CEN-
TRING CHUCK CLAMPING PRES-
SURE IS CLOSE TO THE MAXIMUM
OPERATING VALUE (170 BAR).
• Tilt up tool holder arm, unhook it and lift it plac-
ing it in “off-work” position (
Fig. 20 ref. 1
); use
the handle control to position the tool holder arm
on the outer side of the wheel then place it in work
position (
Fig. 19 ref. 1
) and secure with the safety
hook provided (
Fig. 2-3-4 ref. 8
).
PAY ATTENTION WHEN REPOSI-
TIONING THE TOOL HOLDER ARM
TO AVOID CRUSHING HANDS.
ALWAYS MAKE SURE THAT THE
ARM IS CORRECTLY HOOKED TO
CARRIAGE.
• Carry out the tools holder head 180° rotation, accord-
ing to the descriptions in the relevant paragraph, in
order to insert the hook between the rim edge and the
tyre bead; the operation must be carried out during
mandrel rotation.
• Move the rim away from the tool by about 4-5 cm
to avoid possible unhooking of the bead from the
same tool.
• Translate the hook tool outwards until the reference
notch matches the external edge of the rim.
• Move to work position
A
(
Fig. 8
).
• Insert lever (
Fig. 43 ref. 1
) between the rim and the
bead on the right-hand side of the tool.
Fig. 43
• Keeping the lever pressed, lower the wheel until the
edge of the rim is approximately 5 mm distant from
the hook tool.
• Turn the wheel clockwise keeping lever pressed until
the bead has gone completely out.
• Move away the tool holder arm in “off-work” position
(
Fig. 20 ref. 1
); lower the clamping unit until the
tyre rests on the footboard; exert a certain pressure
on it; this will create enough space to extract the
inner tube.
• Extract the inner tube and lift the wheel.
• Move to work position
D
(
Fig. 8
).
• Tilt up tool holder arm, unhook it and lift it plac-
ing it in “off-work” position (
Fig. 20 ref. 1
); use
the handle control to position the tool holder arm
on the inner side of the wheel then place it in work
position (
Fig. 19 ref. 1
) and secure with the safety
hook provided (
Fig. 2-3-4 ref. 8
).
• Carry out the tools holder head 180° rotation, accord-
ing to the descriptions in the relevant paragraph, in
order to insert the hook between the rim edge and the
tyre bead; the operation must be carried out during
mandrel rotation.
7505-M002-4_B
NAV41.11N - NAV41T.11N - NAV41.13N - NAV41T.13N -
NAV41.13EI - NAV41T.13EI - NAV41.13SA - NAV41T.13SA
