CEMB USA C29 (A) - Manual (Page 17)

I 0337 - 16 I 0337 - 17 GB GB
7.1 - Inconsistent unbalance readings
It may occur that after balancing a wheel, when removing it from the wheel balancer and then remounting it, the
wheel is not balanced. This is not the result of an incorrect indication by the machine, but only of incorrect mounting
of the wheel on the flange, i.e. in the two mountings the wheel has assumed a different position with respect to shaft
axis of the wheel balancer. If the wheel has been mounted on the flange with screws, it may be that the screws have
not been tightened correctly in gradual criss-cross manner one after the other, or (as often occurs) holes have been
drilled in the wheel with too wide tolerances.
Small errors, up to 10 grams (0.4 oz), are to be considered normal in wheels locked with a cone: the error is normally
greater for wheels locked with screws or studs.
If, after balancing, the wheel is still unbalanced when refitted on the vehicle, this could be due to the unbalance of
the brake drum or very often is due to the screw holes in the rim and the drum drilled with too wide tolerances. In this
case a readjustment would be advisable using the wheel balancer with the wheel mounted.
8 - Routine maintenance
Before carrying out any operation on the machine, cut the power supply to the machine.
8.1 - Replacing the protection fuses
A protection fuse is fitted on the power board, accessible by dismantling the weight shelf (see Exploded Drawings). If
fuses require replacement, use ones with an identical current rating.
If the fault persists, contact Technical Service.
NONE OF THE OTHER MACHINE PARTS REQUIRE MAINTENANCE.
9 - List of recommended spare parts (references on exploded drawings)
CODE DESCRIPTION
020600503 Bearing 6005 - 2Z Ø 25/47/12
181198630 Spring 19863P
67M38954E Phase generator board with cable
05PR60963 LEXAN panel
181206560 Distance gauge spring
681002000 Fuse DM5x20 - 20A
511242101 Bipolar stub switch
86SC61681 Computer board
67M40387D Supply board
616001000 Supply 230 V AC
86SB52461 Power supply 12-24 V DC