INSTRUCTION, USE AND
MAINTENANCE MANUAL
GB
Page 25 of 68
7503-M002-6_B
NAV26HW - NAV26HW.S - NAV26HW.ST
• Mount the grippers in the lowest point (6 o’clock)
outside the second bead.
• Move to work position
B
(
Fig. 11
).
• Turn the mandrel counterclockwise placing the grip-
pers at 1 o’clock.
• Move the tool forward until the the axis of the ref-
erence notch matches the external edge of the rim
coincide at about 5 mm from the rim itself (
Fig. 24
).
Begin clockwise rotation making sure that, after a
90° turn, the second bead begins to slide in the rim
groove. Turn until the grippers reach in the closest
point to the tool (11 o’clock). The second bead should
now be inserted in the rim.
• Move the tool away from the wheel, turn it over into
“out of work” position and remove the grippers.
• Lower the mandrel until the wheel rests on the floor.
• Move to work position
A
(
Fig. 11
).
• Close the mandrel jaws completely (NAV26HW
- NAV26HW.S) or remove the locking ring nut
(NAV26HW.ST) making sure the wheel is held up to
avoid dropping.
MAKE SURE THAT THE WHEEL’S
HOLD IS SECURE TO AVOID IT
FALLING DURING REMOVAL. FOR
HEAVY AND/OR VERY LARGE
WHEELS USE AN ADEQUATE LIFT-
ING DEVICE.
• Remove the wheel from the machine by making it roll.
12.8 Tyres with inner tube
12.8.1 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 ROLL AS SOON AS THE
BEADS HAVE BEEN DISLODGED
TO AVOID DAMAGE TO THE IN-
NER TUBE OR TO THE VALVE.
12.8.2 Demounting
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).
• Bring the roll holder arm in the “out of work” position
(
Fig. 18 pos. 1
); by operating on the handle control
position the roll holder arm on the external side of
the wheel then bring it back into “working” position
(
Fig. 17 pos. 1
) and lock it with the special safety
pin (
Fig. 1, 2
and
3 pos. 12
).
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.
• Mount the hook tool turned towards the tyre in order
to insert the same hook between the rim edge and the
tyre bead; the operation must be carried out during
the mandrel rotation.
• Move the rim away downwards from the tool by about
4-5 cm to avoid possible unhooking of the bead of
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. 11
).
• Insert lever (
Fig. 31 pos. 1
) between the rim and the
bead on the right-hand side of the tool.
