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INSTRUCTION, USE AND
MAINTENANCE MANUAL
GB
Page 25 of 96
12.6.2 Demounting
THROUGHOUT TYRE MOUNT-
ING/DEMOUNTING OPERATIONS,
CHECK THAT THE SELF-CEN-
TRING CHUCK CLAMPING PRES-
SURE IS CLOSE TO THE MAXIMUM
OPERATING VALUE (160 BAR - 180
BAR).
Tubeless tyres can be removed in two ways:
A.
If the wheel does not present particular problems,
continuing beading operation will completely dis-
lodge the beads from the rim. The inner bead,
pushed by the disc, presses against the outer one
till it has been completely removed (see
Figure 28
).
Fig. 28
B.
If the wheel is especially hard, it is not possible to
carry out the procedure described in point
A
. A
different procedure will be necessary: use the hook
tool and follow this sequence of operations:
• Move to work position
C
(
Fig. 6
)
.
• Position the tool holder arm on the outer side of the
wheel and bring forward the hook tool, inserting it
between rim and bead until it is secured to the bead
itself (see
Fig. 29
).
Fig. 29
• Move the rim away from the tool by about 4-5 cm
to avoid possible unhooking of the bead from the
same tool.
• Move to work position
A
(
Fig. 6
).
• Translate the tool outwards (
Fig. 30 ref. 2
) to al-
low easy insertion of lever (
Fig. 30 ref. 1
) between
the rim and the bead; insert lever (
Fig. 30 ref. 1
)
between the rim and the bead on the right-hand side
of the tool (
Fig. 30 ref. 2
).
1
2
Fig. 30
• Keeping the lever pressed, lower the wheel until the
edge of the rim is 5 mm distant from the hook tool.
• Turn the wheel clockwise keeping lever pressed
(
Fig. 30 ref.1
) until the bead has gone completely
out.
• Once the external bead has been removed, move
tool holder arm away from the wheel, unhook it and
lift it bringing it in “out of work” position (
Fig. 18
ref. 1
); use the handle control to position the tool
holder arm on the inner side of the wheel then place
it in “working” position again (
Fig. 17 ref. 1
) and
secure with the safety hook provided.
PAY ATTENTION WHEN REPOSI-
TIONING THE TOOL HOLDER ARM
TO AVOID CRUSHING HANDS.
ALWAYS MAKE SURE THAT THE
ARM IS CORRECTLY HOOKED TO
CARRIAGE.
• Move to work position
D
(
Fig. 6)
.
• Carry out the tools holder head 180° rotation in order
to insert the hook tool (
Fig. 31 ref. 1
) between the
rim edge and the tyre bead.
7522-M004-1_B
NAV51.15 - NAV51T.15 - NAV51.15N