CEMB USA C29 (A) User Manual

Page 17

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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