33
5.1-2
5.1-3
•
Fit the supplied cushion to the pressure drum to
prevent damage to painted or non-steel rims.
Refer to Figure 5.1-2. From top to bottom the following
cone clamping systems are shown:
Back Cone Mounting with pressure drum.
The cone centers the wheel from inside. The
pressure drum should contact the wheel on a flat
surface. Never center the wheel with the pressure
drum.
Back Cone Mounting without pressure drum.
Only if the pressure drum cannot contact the front
face properly (e.g. very small wheels). Ensure that
the quick release hub nut does not contact the cone.
Else use the spacer ring.
Front Cone Mounting.
The cone centers the wheel from outside.
Front Cone Mounting with an extension adapter.
The extension adapter may be required for some
light truck wheels and reverse-offset wheels that
must be moved away from the balancer mounting
flange.
Install the extension adapter on the mounting flange
with the knurled thumbnuts provided. Then mount
the wheel, using the normal front cone method.
Double Cone Mounting
The cones must not touch each other. If the cones
touch, the wheel will not be centred and mounted
securely.
Note:
Double cone mounting can be used for
some speciality wheels. The back cone
centres on the formed part of the wheel,
and the front cone centres on the hole.
Adaptor Mounting.
Refer to Figure 5.1-3. From top to bottom are shown:
Universal Wheel Adaptor
Metric Bolt Plate Adaptor
Mount the adaptor and wheel as described in the
adaptor manual.
5.1.1
Wheel Mounting Errors.
Refer to Figure 5.1.1-1.
Regardless of the mounting method used, the wheel
must be centred before balancing.
The wheel must be clean and free of large burrs or
nicks, especially where it mates with the cone or
adapter and the balancer flange.
Any dirt between the flange and the mating surface of
the wheel will cause misalignment on the shaft.
A misalignment of the thickness of a matchbook cover
will cause an unbalance of 15 grams (0.50 ounce) or
more on automobile wheels and 30 grams (1 ounce)
on light truck wheels.
Содержание VPI System IV
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