– 8 –
-
The displays now read as follows: Right hand display: % value (symbol ) of possible unbalance reduction compared to
the current
condition of the wheel .
Left hand display: Current static unbalance value. This is the value that can be reduced by the figure ,read off the right
hand display by turning the tire on the rim.
LEDs: Manually turn the wheel until the outer leds light up (display position); mark the top of the tire. Continue the (manual)
rotation and similarly mark the wheel rim where it corresponds to the position indicated by the inner leds.
-
Unbalance optimizing is achieved by turning the tire on the wheel rim again (using a tire remover) until the two marks line
up.
Press the STOP key to end the unbalance reduction operation and return to measuring wheel unbalance.
3.12 Inconstant unbalance readings
When a wheel has been balanced, is removed from the balancing machine and then fitted to it again, the instruments may read
that the wheel is not balanced.
This does not depend on defective machinery instruments, but is due to the wheel having been fitted badly to the adapter, i.e.
the wheel is in a different position with respect to the balancing machine axis in the first and second fittings.
If the wheel is fitted to the adapter with screws, the screws may not have been tightened correctly, i.e. using the crossover
system, gradually, or (as often happens), the holes in the wheel may have too much tolerance.
Small errors, up to 10 grams (0.4 oz) should be considered normal in wheels fitted on a cone adapter, the error is normally
greater for wheels fitted with screws or blocks. If the wheel is found to be still unbalanced when it is fitted to the vehicle after
balancing, this depends on the unbalances in the vehicle’s brake drums or very often on the holes for the bolts of the wheel rim
and brake drum, which are sometimes made with too much tolerance. In this case, it may be advisable to rebalance with the
wheel on the vehicle.
4. ORDINARY MAINTENANCE
Switch off the machine’s power supply before executing any maintenance operations.
4.1 Adjusting the belt pulley
1.
Slightly loosen the four screws that support the motor and move the motor to adjust the belt tension.
2.
Block the four motor screws carefully, check that the belt does not play laterally and touch the casing when in movement.
4.2 Computer board replacement
Machine parameters input:
When the computer board is to be replaced by a new one, it is necessary to insert the machine parameters.
To perform this operation, act as follows: press push buttons F + C as to execute the self-calibration; When the position
LEDs stop flashing press the following push buttons within 5 seconds and with the proper sequence:
↓
a +
↑
a + F .
After having pressed
↓
a
and
↑
a
, the displays turn off ,and after having pressed F the present value of fixed distance “DF”
appears: modify by
↑
b
and
↓
b
.
Press to pass
↑
a
to the modification of the “I” value.
