Motor/ gear assembly
192-550003N10 ETH ATEX December 2019 41
2.3.2.4 Re-apply toothed belt pre-tension
ETH032 ... ETH080
If the motor / gearbox is exchanged and the toothed belt is still in good condition,
the pre-tension can be reset without measuring device.
Remove the upper cover, please refer to Figure 20 Pos 6
First check whether the toothed belt with its toothing
is located in the upper and lower pulley.
The screws (please refer to Figure 28
srewed in withouth torque so that the drive unit can
be lifted upwards
Recommendation: Screw in the screws completely
and then loosen again about half a turn.
Tighten central toothed belt tensioning screw (please
refer toFigure 20
Pos.12).
The drive unit
must lift when tightening the screw. Lift
the unit until it touches the 2 internal stops (please
refer to
Figure 20 Pos. 10). This is made by
tightening the central tightening screw.
Figure 28: Screws for fixation
of drive unit ETH032...ETH080
Tighten 4 screws (please refer to Figure 28 Pos.7) with the given tightening
torque (please refer to Table 3).
Refix both lids (please refer to Figure 20 Pos.4 & 6) with the respective screws
(please refer to Figure 20 Pos.11 & 9).
ETH100&125
The ETH100&125 electro cylinder is furnished with tensioned belt. When
dismantling the gearbox / motor, the belt must NOT be detensioned. Therefore, this
chapter is usually not valid for the ETH100&125.
Screw tightening torques belt tensioning option
Table 3: Screw tightening torques belt tensioning option
2.3.2.5 Resetting the toothed belt pre-tension
After installing a new toothed belt, the toothed belt pre-tension must be readjusted.
Make sure that the screws
ETH032…ETH080: see Figure 28, Pos 7
ETH100 & ETH125; see Figure 29, Pos7 are provided
with a medium strength screw lock (e.g. type Wiko
02K43) and are fully screwed in. Only screw in screws
without torque: Recommendation: Screw in the screws
completely and then loosen again about half a turn.
ETH032…ETH080: For this sizes, the motor/ gearbox is
already mounted.
ETH100 & ETH125: For this sizes, the motor/ gearbox
can be installed after belt tensioning. Furthermore, it mus
be take care the the lower bearing cover is already
mounted (see
Figure 39 Pos 3, screws Pos 1 with
medium strength screw locking, eg type Wiko 02K43).
Figure 29
: Screws for
fixation of drive unit
ETH100 & ETH125
Check, if the belt toothing is geared into the upper and lower toothed pulley.
The screws (please refer to Figure 28 Pos.7
ETH100&125; see Figure 29, Pos7) must be screwed in without torque, so that
the drive unit can be lifted upwards.
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