10. Unbalance Minimization - Bosch WBE 4230 Notice Originale

10. Unbalance minimization

If great unbalance is measured at the wheel (e.g. static
unbalance greater than 50 g), it is advisable to perform
wheel matching by using the unbalance of the rim to
provide compensation for the static unbalance of the
tire (unbalance minimization). The first step involves
turning the tire through 180 degrees on the rim. Additi-
onal minimization can then be achieved by turning the
tire further. The matching program provides assistance
with this minimization process.
!
Work as accurately as possible throughout the entire
procedure.
i
The matching program must be implemented again
if the error messages
display.
i
The matching program can be terminated by pres-
sing the <OPT> key.
i
Sound and automatic start are active in the following
description (refer to Section 11).
Step 1: Start of matching program
¶
Press the <OPT> key.
 Display
and
0Pt 1
 The Opt symbol lights.
Step 2: First measurement
¶
Close the wheel guard.
 Measurement commences.
 Display
and
0Pt 2
 The Opt and Split symbols light.
Step 3: Turning of tire on rim
i
To turn the tire on the rim it may be necessary to
deflate the tire, unseat it again and re-inflate after
turning.
1. Turn the wheel until the valve is in the 12 o'clock
position.
2. Press the <SPLIT> key.
 The reference position of the wheel is stored on
initial starting.
 Display
and
0Pt 3
3. Make a reference mark on the tire (at the position of
the valve).
4. Detach the wheel from the flange.
Robert Bosch GmbH
and appear on the
0Pt EAA
.
.
.
Unbalance minimization | WBE 4230 | 45
5. Turn the tire through 180 degrees on the rim such
that the mark previously made is opposite the valve.
Step 4: Storage of new position
1. Secure the wheel.
2. Turn the valve to the 12 o'clock position.
3. Press the <SPLIT> key.
 The new position of the wheel on the flange is
stored.
 Display
and
0Pt 4
Step 5: 1st reference measurement
1. Close the wheel guard.
 Measurement commences.
2. Evaluation of measurement result:
Display and
0Pt YE5
minimization can be terminated.
Display and => Minimization not successful,
0Pt 5
minimization can be cancelled or continued (as of
Step 6).
i
The following values are displayed on pressing the
<SPLIT> key:
Left display: Minimum residual unbalance
Right display: Static current unbalance value
i
If the static unbalance value is close to the minimum
residual unbalance (less than 10 g), minimization
can be terminated by pressing the <OPT> key.
Step 6: Further turning of tire on rim
1. Turn the wheel until the balancing position LED
lights in green.
2. Make a reference mark on the tire (at the 12 o'clock
position).
3. Detach the wheel from the flange.
4. Turn the tire on the rim such that the mark previous-
ly made is at the location of the valve.
5. Secure the wheel.
6. Turn the valve to the 12 o'clock position.
7. Press the <SPLIT> key.
 The new position of the wheel on the flange is
stored.
 Display
and .
0Pt 6
Step 7: 2nd reference measurement
¶
Close the wheel guard.
 Measurement commences.
 Refer to step 5 for evaluation and further procedure.
.
=> Minimization successful,
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1 695 656 347 2011-03-18
en