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2010-11-22
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40 | SBM 855 | Minimizing unbalance (Commercial vehicle wheel)
en
9. Minimizing
unbalance
(Commercial vehicle wheel)
If the measured wheel unbalance is very high (e.g. sta-
tic unbalance in excess of 50 g), we recommend mat-
ching the wheel by compensating the static unbalance
of the tire with the unbalance of the rim (minimizing
unbalance). To do this, as the first step turn the tire
on the rim 180 degrees. Additional minimization can
be achieved by turning the wheel further. The Match
program assists you with this minimization.
!
Carry out the entire process with the highest degree
of accuracy!
i
If the error message
oPt
and
Err
appear in the dis-
play, you must repeat the Match program.
i
Exit the Match program by pressing the <
MODE
>
button.
i
In the description below, sound and automatic start
are active (see section 10).
Step 1:
Start the Match program
1.
Press and hold the <
MENU
> button.
2.
Release the <
MENU
> button when
oPt
appears in
the display.
oPt
and
1
are displayed.
Step 2:
First measurement
Close the wheel guard.
Measurement begins.
oPt
and
2
are displayed.
Step 3:
Turning the tire on the rim
i
In order to turn the tire on the rim, it may be neces-
sary to let air out, lever the tire off and fill with air
again when rotation is complete.
1.
Turn the wheel until the valve is at 12 o’clock.
2.
Press the <
SPLIT
> button.
When the machine is started for the fi rst time, the
reference position of the wheel is saved.
oPt
and
3
are displayed.
3.
Mark the reference position on the tire (at the valve
position).
4.
Remove the wheel from the flange.
5.
Turn the tire on the rim 180 degrees, so that the
mark you have made is situated opposite the valve.
Step 4:
Saving the new position
1.
Fasten the wheel.
2.
Turn the valve to 12 o’clock.
3.
Press the <
SPLIT
> button.
The new position of the wheel on the fl ange is sa-
ved.
oPt
and
4
are displayed.
Step 5: 1.
Checking measurement
1. Close the wheel guard.
Measurement begins.
2.
Evaluate the measurement result:
oPt
and
YE5
displayed => minimization successful,
minimization can be concluded.
oPt
and
5
displayed => minimization unsuccessful,
minimization may be interrupted or continued (from
Step 6 onwards).
i
Pressing the <
STOPP
> button displays the following
values:
Left display: minimum residual unbalance
Right display: static current unbalance value
i
If the static unbalance value is close to the minimum
residual unbalance (below 10 g), minimization can
be ended by pressing the <
MODE
> button.
Step 6:
Turning the tire further on the rim
1.
Turn the wheel until the green balancing position
LED lights up.
2.
Mark the reference position on the tire
(at 12 o’clock).
3.
Remove the wheel from the flange.
4.
Turn the tire on the rim so that the mark you have
made is situated where the valve is.
5.
Fasten the wheel.
6.
Turn the valve to 12 o’clock.
7.
Press the <
SPLIT
> button.
The new position of the wheel on the fl ange
is saved.
oPt
and
6
are displayed.
Step 7: 2.
Checking measurement
Close the wheel guard.
Measurement begins.
See Step 5 for evaluation and further procedure.
