CEMB USA C206 (A) - Manual (Page 20)

I 0638 - 20 GB
7.1 - INCONSISTENT UNBALANCE READINGS
Sometimes after balancing a wheel and removing it from the balancing machine, it is found that, upon 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 or studs.
If, after balancing, the wheel is found to be still out-of-balance when refi tted on the vehicle, this could be due to the
unbalance 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.
8 - ROUTINE MAINTENANCE
Switch off the machine from the mains before carrying out any operation.
8.1 - TO REPLACE THE FUSES
Remove the weight holder shelf to gain access to the power supply board where the fuses are located (see Exploded
Drawings). If fuses require replacement, use ones of the same current rating.
If the fault persists, contact the Technical Service Department.
NONE OF THE OTHER MACHINE PARTS REQUIRE MAINTENANCE.
Err. 25 Distance between the spokes greater
than 120 degree 1. The minimum distance between the spokes where to split the
unbalance must be smaller than 120 degrees
2. Repeat the SPLIT function increasing the distance between the
spokes.