John Bean VPI System, Operation Instructions Manual

Page 10

4.0 OPERATION OF THE BALANCER

WARNING:  For operator safety please read
and follow the precautions outlined on
pages 1 and 2 of this manual.

NOTE:  Read all instructions before pro-
ceeding with operation of the balancer.

All balancer functions are input into the main computer
through the large easy to read touch panel.  Although
each wheel tire assembly differ in some ways all bal-
ancing jobs require basically the same procedure.  The
order of events to take place are:

1.  Inspection of the wheel/tire assembly
2.  Mounting wheel onto shaft or adapter
3.  Selection of Balancing Mode and Preferences
4.  Entry of wheel parameters
5.  Spinning the wheel
6.  Applying the recommended weight
7.  Check spin if desired
8.  Dismounting the wheel

The following operation instructions will follow the ba-
sic outline above.

4.1  CHECK LIST - INSPECTION

Observe Before Balancing Wheel

1. Check for proper air pressure.  If not correct, inflate to
correct pressure.

2. Check for any foreign material inside tire.  If present,
remove before balancing tire.

WATER IS FOREIGN MATERIAL!

3. Remove old weights — old weights may be improper
value or in wrong location.

4. Be sure tire and wheel are free of excessive dirt, rust
and large stones. Use wire brush on back side of wheel
if necessary.

4.2  WHEEL MOUNTING

Nearly all standard wheels and many alloy wheels have
accurately machined center holes, and they should be
mounted with center cones.  Accurate balancing de-
pends on accurate mounting of the wheel and correct
seating of the cone in the pilot hole. Insure that the wheel
is centered on the shaft exactly as it will be mounted to
the vehicle.

Before starting any balancing procedure it is very im-
portant that the wheel is mounted on the machine with
the proper adaptors. An incorrect centering of the wheel
will result  in considerable imbalance.

There are many types of wheels and John Bean  sup-
plies adaptors of good quality and durability for the large
majority. However if you meet special wheels which may
require a specific adaptor, call your authorized John
Bean  distributor.

Rims may be divided into these major groups:

1. Car rims with a true center hole.
2. Car rims without a center hole.
3. Car rims with an untrue center hole.
4. Light truck rims.

4.2.1 Standard Wheels  (back cone mount)

Mount the wheel as detailed below in Figure 11:

1.

 Mount proper cone against spring plate.

2.

Mount wheel on shaft in the same manner as you
would on the car.

3.

Mount pressure cup on shaft and place against
outside of wheel, follow with the Quick-nut.

4.

Tighten Quick-nut securely with both hands. To
operate the Quick-nut pull the lock-unlock lever
(Figure 12). Slide the Quick-nut on the threaded
shaft. When in contact with the rim, release the
unlock lever and tighten firmly. To assist in
centering the wheel properly, rotate the wheel on
the shaft while tightening the quick nut.

Figure 11