Bosch VLE 21 Series Repair Instructions page 42

en 42 | VLE 21xx | Settings
7.2.2 Adjusting spindle guide
Contents Adjusting spindle guide
Applicability VLE 2130 EL, VLE 2140 EL
The spindle guide must be adjusted after setting the
overtravel.
1. Tighten the hose clamp (Fig. 15, Pos. 1) at the
spindle guide (Fig. 15, Pos. 2).
Fig. 15: Adjusting spindle guide
1 Hose clamp
2 Spindle guide
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Continue tightening the hose clamp until the spindle
attains a moment of resistance of 22 Nm. Check this
with a torque wrench at the end of the spindle.
2. Perform one lifting operation.
3. Check and if necessary correct the setting.
7.2.3 Adjusting belt tension
Contents Adjusting tension of ribbed belt
Applicability VLE 2130 EL, VLE 2140 EL
Special tools and Vibration meter
other items
The ribbed belt should be checked every six months
and if necessary adjusted as follows:
1. Detach the cover.
2. Cause the ribbed belt to oscillate by tapping or
plucking.
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Fig. 16: Plucking ribbed belt
3. Use a vibration meter to measure the frequency of
the oscillations (in hertz).
Fig. 17: Measuring frequency
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If the ribbed belt tension is correct the frequency
will be 220–240 Hz.
4. Re-tension if necessary with the tensioning bolt
(between the motor and column).
Fig. 18: Re-tensioning with bolt
5. Check the tension again after several lifting and
lowering operations.
Robert Bosch GmbH