Corghi ET77 Betriebsanleitung Seite 86

- centre the rim correctly on the correct diameter of the flange;
- fix the wheel using the counter-flange and the locking ring-nut;
- disengage the brake by pressing the STOP button again. In all cases, the brake will
disengage automatically after 30s;
- lower the lift by moving the control lever in the (DOWN) direction, and push it into
the rest position (towards the balancing machine body).
- Extract the lift by pulling it by the handle until the two columns are close to the
inside of the wheel;
- raise the lift by moving the control lever in the · (UP) direction, until the support
surface is touching the tyre.
Important
In this condition, push the lever in the · (UP) direction for a moment longer so
that the lift surface is pressed slightly against the tyre, to compensate for the slight
lowering of the wheel caused on release due to the elastic effect of the pneumatic
cylinders.
- Release the wheel by removing the locking ring-nut and the counter-flange;
- pull the lift outward until the entire wheel is removed from the shaft (to allow it to be
lowered);
- lower the lift completely by moving the control lever in the (DOWN) direction;
- Unload the wheel from the support surface.
This check allows the user to make sure that wear has not altered the mechanical
specifications of flanges, cones, etc., beyond the specified limits.
A perfectly balanced wheel, removed and replaced in a different position, cannot show
an imbalance of over 10 grams for car wheels and 100 grams for truck wheels.
If the imbalance is higher, check all the accessories with care and replace any that show
dents, abnormal wear, bent flanges, etc.
Always remember that if you are using a cone to centre the wheel on the shaft, you will
never obtain good results if the hole in the rim is not perfect, i.e.: off-centre or out-of-
round. Results are always better when the wheel is centreed with the rim holes.
It should be remembered that any difference between the way the wheel is mounted
on the vehicle and the way it is mounted on the balancing machine will undoubtedly
generate a certain degree of imbalance.
This can only be eliminated with "on vehicle balancing", using a finishing balancing
machine to complement the work on the bench balancing machine.
86
Removing the wheel
BALANCING ACCESSORY
AVAILABILITY STATUS
ET 77 operator's manual