INSTRUCTION, USE AND
MAINTENANCE MANUAL
GB
Page 30 of 68
• Turn the mandrel and smear the entire bead seat of
the rim with lubricant.
• While doing this, jerk the beading disc forward until
the first bead is removed.
• Repeat the operation, making the beading disc move
forward (see
Fig. 41
) until the stop ring is released
(
Fig. 41 pos. 1
). It will be then extracted through
lever (
Fig. 41 pos. 2
).
Fig. 41
• Remove the bead wire.
• Remove the O-Ring, when featured.
• Place the roll holder arm in “out of work” position
(
Fig. 18 pos. 1
) after having unhooked it.
• Move to work position
A
(
Fig. 11
).
• Bring back the roll holder arm inside the tyre in
“work position” (
Fig. 17 pos. 1
). Remove the pin,
turn the beading disc with a 180° rotation and lock
it again with the pin.
• Move forward the bead breaking disc until the tyre is
completely dislodged from the rim (in case of tyres
with inner tube, make sure that the valve hasn’t been
damaged during removal).
THE REMOVAL OF THE BEADS
FROM THE RIM CAUSES THE
TYRE TO FALL. ALWAYS MAKE
SURE THAT NO ONE IS STAND-
ING BY ACCIDENT IN THE WORK
AREA.
7503-M002-6_B
NAV26HW - NAV26HW.S - NAV26HW.ST
WHEN DEMOUNTING VERY HEAVY
TYRES IT IS ADVISABLE TO PAY
CAREFUL ATTENTION BEFORE
COMPLETING THE OPERATION.
PAY ATTENTION WHEN REPOSI-
TIONING THE ROLL HOLDER ARM
TO AVOID HAND CRUSHING.
ALWAYS MAKE SURE THAT THE
ARM IS CORRECTLY LOCKED TO
THE SHIFTING BEAM.
12.9.2 Mounting
THROUGHOUT TYRE MOUNT-
ING/DEMOUNTING OPERATIONS,
CHECK THAT THE SELF-CENTRING
MANDREL CLAMPING PRESSURE
IS CLOSE TO THE MAXIMUM
OPERATING VALUE (130 BAR)
(NAV26HW - NAV26HW.S).
• Place the roll holder arm in “out of work” position
(
Fig. 18 pos. 1
); if it has been removed, fix the rim
to the mandrel as described in “WHEEL CLAMPING”
paragraph. If the wheel features an inner tube, posi-
tion the rim with the valve slot facing downwards
(at 6 o’clock).
• Lubricate the entire bead seat of the rim and the
tyre beads.
• Move to work position
A
(
Fig. 11
).
• Place the mandrel in order to centre the rim on the
tyre.
• Put manually the tyre into the rim (in case of tyres
with inner tube, make the valve re-enter not to dam-
age it) until the complete introduction of the tyre has
been reached.
• Insert the bead wire on the rim with the stop ring
fitted (if the rim and bead wire feature fixing slits,
they must be in phase with each other).
• Move to work position
B
(
Fig. 11
).
• Place the roll holder arm on the external side then
lower it into “work position” (
Fig. 17 pos. 1
). Mount
the accessory G108A22 with the beading disc facing
the wheel. If the outer edge ring is not sufficiently fit-
ted on the rim, position the mandrel until the bead
wire is near the beading disc.
