699-41-20.1
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6.4
Checking and adjusting belt tension
6.4.1
Belt tension ELZ
Fig. 4 Belt tension axis type ELZ
A timing-belt tensioning device is attached at the ends of the toothed
belt and is fastened in the axis carriage (5) as well. The cogged-belt ten-
sioning device is set by stud screws which are recessed into the threaded
holes (2). By screwing the stud screws in, the timing belt is stretched. By
unscrewing them, the tension is slackened. In this way, it is easy to adjust
the timing belt.
Check the belt ten-
sion
It is not necessary to disassemble the axis or the carriage to check belt
tension:
Shove the carriage (5) in front of a bearing (7) so that the maxi-
mum belt length is freed up at the other side.
Exert the prescribed force (see table) a tension spring balance in
the middle of belt.
Compare the resulting “sag” (f) with the slackened belt.
Once you have ascertained the “sag”, please compare your measured
value with the recommended value which you obtain from the diagram.
The recommended values in the diagram are displayed according to the
scale and the traverse path (hub) of the axis.
If your value diverges from the default, you must stretch or slacken the
belt. The following section describes how this is done.
Check and adjust
belt tension
Shove the carriage (5) in front of a bearing (7) so that the maxi-
mum belt length is freed up at the other side.
