Calibration With Wheel And Sample Weight; Reference Measurement - Bosch WBE 4420 Instrucciones De Reparacion

6. Fasten a test wheel with iron rim (possibly 13" or
14").
7. Enter the diameter, width and distance of the rim
and press <OK>.
8. Position the calliper gauge (Fig. 2, B) on the edge of
the rim and press <OK>.
"
The calibration of the calliper gauge and
measurement arm is completed.
3.3.4

Calibration with wheel and sample weight

i
Keep to the indications displayed on the monitor.
1. Fix the wheel of a motor vehicle of average size
and in excellent conditions (e.g. 5.5" wide, 14"
diameter) on to the flange.
2. Select WBE 4420 Calibration and confirm by
pressing <OK>.
« Calibration is started.
3. Enter the data of the rim and confirm by pressing
<OK>.
4. Press <START>.
« Measurement is started.
5. Enter any balancing weight between 40 g and 120°g
and confirm by pressing <OK>.
6. Apply the balancing weight of the value entered on
the internal side of the wheel.
7. Press <START>.
« Measurement is started.
8. Turn the wheel until the balancing weight is in 12
o'clock position.
9. Remove the balancing weight from the internal side
of the wheel and apply it on the external side (12
o'clock).
10. Press <START>.
« Measurement is started.
11. Turn the wheel until the weight is in 6 o'clock
position.
12. Press <OK>.
"
Calibration is completed.
i
The performed calibration is automatically and
permanently saved.
Robert Bosch GmbH
Settings and Service | WBE 4420 | 29
3.3.5

Reference measurement

i
Exact centering of the wheel is a basic prerequisite
for this reference measurement and for all
balancing operations.
i
Sound and automatic start are active in the following
description (refer to Section 8.3.3 ).
1. Attach a motor vehicle wheel of medium size (e. g.
width 5.5", diameter 14") and in very good condition
to the flange.
2. Enter the wheel data (refer to Section 8.2).
3. Close the wheel guard.
« Measurement commences.
4. Create an artificial unbalance by attaching a test
weight of e. g. 60 g to one of the two sides.
5. Close the wheel guard.
« Measurement commences.
« The WBE 4420 must display precisely this unbalance
(value and position) on this side. The value indicated
for the other side must not exceed 5 g.
i
To check the position of the unbalance, turn
the wheel until the position recommended for
attachment of the balance weights is attained. The
test weight attached must be vertically beneath the
axis of rotation (6 o'clock position).
!
Calibration must be repeated in the following cases:
$
Deviation from specified unbalance value
(greater than 1 g on test weight side, more than
5 g on other side).
$
Deviation from specified unbalance position (test
weight not between 5:30 and 6:30 position).
6. Remove the test weight.
7. Release the wheel and turn it through approx. 35°.
8. Re-attach the wheel.
9. Close the wheel guard.
« Measurement commences.
"
On completion of this reference measurement, the
display must not exceed a maximum unbalance of 10 g
per side (15 g for particularly heavy wheels). This error
may be caused by the rim centering tolerances. If this
reference measurement indicates greater unbalance,
the components used for centering the wheel must be
checked for wear, play and contamination.
en
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1 695 655 424 2010-04-30