Hoffmann monty 3550, Operation Manual

Page: 17 / 84

4.1-4
4.1-5
4.1-6
4.1-7
4.1-8
EN -
17
C . Set the rim clamps to the proper position: retract clamps
to clamp the wheel from the inside and expand clamps to
clamp from the outside.
Clamping the wheels from the outside set the clamps at
diameter nearly equal to the rim diameter, before placing
the wheel on the clamps. This will avoid the risk of pinching
the tire.
WARNING
TO MINIMIZE THE RISK OF SCRATCHING ALLOY
RIMS, THESE SHOULD BE CLAMPED FROM THE
OUTSIDE
D . Liberally lubricate both beads.
Place the wheel WITH DROP CENTER UP (Fig. 4.1-4)
on the turntable, and clamp in position. Hold the tire and
wheel down while clamping.
E . Position the mount/demount head in contact with the rim
edge and lock it into place: the tool automatically moves
away from the rim edge vertically. Turn the adjustment
knob until the mount/demount head clears from the rim
fl ange about 1/16” (2 mm): this is necessary to avoid rim
damage (Fig. 4.1-5).
NOTE :
The plastic insert inside the mount/demount tool must
be periodically replaced. Every machine is
equipped with several plastic inserts (inside
standard equipment box). If desired, a steel
roller also included in the standard equipment
box may replace the plastic insert. Follow the
instructions included with the replacement
parts.
NOTE :
Once the mount/demount head is positioned properly,
matching wheels may be changed without
having to reset the head.
F. Insert the bead-lifting tool under the bead and over the
support of the mount/demount tool. Lift the bead onto the
mounting fi nger. To facilitate this operation, press with left
hand on the bead in position diametrically opposite to that
of the tool. If desired, the bead-lifting tool can be removed
after lifting the bead onto the fi nger (Fig. 4.1-6).
G . Rotate the turntable clockwise and at the same time
push down on the tire sidewall to move the bead into the
drop-center of the rim (Fig. 4.1-7).
H . Repeat the process for removing the lower bead. With
left hand, lift the bead in position diametrically opposite
the tool to keep it in the drop center (Fig. 4.1-8). Move the
swing arm aside and remove the tire.