CEMB USA C212 (A) - Manual (Page 15)

I 0648 - 15 GB
Err. 25 Distance between the spokes greater
than 120 degree 1. The minimum distance between the spokes where to split the
unbalance must be less than 120 degrees
2. Repeat the SPLIT function increasing the distance between the
spokes.
7.1 - INCONSISTENT UNBALANCE READINGS ►
Sometimes after balancing a wheel and removing it from the balancing machine, it is foun d that, mounting it on the
machine again, the wheel is not balanced.
This does not depend on incorrect indication of the machine, but only on faulty mounting of the wheel on the adapter,
i.e. in the two mountings the wheel has assumed a different position with respect to the balancing machine shaft centre
line. If the wheel has been mounted on the adapter with screws, it could be possible that the screws have not been
correctly tightened, i.e. crosswise one by one, or else (as often occurs) holes have been drilled on the wheel with too
wide tolerances. Small errors, up to 10 grams (0.4 oz) are to be considered normal in wheels locked by a cone; the error
is normally greater for wheels fastened with screws.
If, after balancing, the wheel is found to be still out-of-balance when refi tted on the vehicle, this could be due to unba-
lance of the car brake drum or very often due to the holes for the screws on the rim and drum sometimes drilled with
too wide tolerances.
In such case a readjustment could be advisable using the balancing machine with the wheel mounted on the car.
8 - ROUTINE MAINTENANCE (see exploded drawings) (for non specialized personnel only
Always disconnect the machine from the mains before carrying out any operation.
8.1 - TO ► REPLACE THE DRIVING PULLEY
The drive pulley is guaranteed by the manufacturer for approximately 20000 runs.
A spare pulley is found inside the base (see photograph).
If necessary, to replace the pulley, proceed as follows:
- Remove the head and the weight holder shelf, taking care not to damage the electric wires
- Remove the retaining screw on the pulley in order to replace it
8.2 - TO REPLACE THE BRAKE PAD ►
Back-off the two screws fastening the worn brake pad to the motor mounting brake. Securely fi x the new brake pad
by tightening the screws.
8 ► .3 - TO REPLACE THE FUSES
Remove the weight holder shelf to gain access to the power supply board where the fuses are located. If fuses
require replacement, use ones of the same current rating. If the fault persists, contact Technical Service.
8 ► .4 - MAINTENANCE OF THE PNEUMATIC CIRCUIT
It is important to periodically clean the compressed air fi lter.
N.B.: DRAIN FREQUENTLY ANY CONDENSATE BUILT UP IN THE FILTER BOWL VIA RELATIVE
VALVE.
NONE OF THE OTHER MACHINE PARTS REQUIRE MAINTENANCE.