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Mounting / Repair
31
5.2.3.2 Checking and adjusting the belt tension
63
60
53
51
1. If necessary, remove the steel strip cover (chapter
5.11.1.1)
2. Measure timing belt tension (chapter 5.2.3.3).
3. Compare the tension with the required value from
Table 9
4. If the actual timing belt tension is less than 0.9 x operating
tension, then the timing belt tension must be corrected. To
do this, remove the dust cover (63) and loosen the lock-
nut (53).
5. Adjusting the timing belt tension:
Move towards the recommended tension by alternately adjusting and checking. To tension,
simultaneously turn both tensioning screws (51) clockwise.
6. Align the timing belt: see chapter 5.3.
7. If necessary, replace the steel strip cover: see chapter 5.11
5.2.3.3 Measuring the timing belt tension
The measuring procedure described below is currently the only way to measure the timing belt
tension to the required tolerance of +/- 5% .
Belt tension measuring device RSM
The RSM belt tension measuring device gives the existing belt
tension based on data previously supplied (specific to belt mass, free
running belt length) and the oscillation frequency of the belt.
(RSM: order number 037- 000201).
5.3 Checking the belt run and aligning the timing belt
Note
If the timing belt has to be re-tensioned, then this must be done before aligning.
Exact alignment is only possible while the carriage is running. On reversing the di-
rection of travel, it must start running towards the opposite flange. This means that
with correct adjustment, the timing belt will always oscillate from left to right (looking
in the direction of movement). In order to maintain the timing belt pre-tension, only
adjust the tensioning screws in small stages. If necessary, check the timing belt ten-
sion again after alignment.
63
60
53
51
1. Remove the dust cover (63).
2. Check the running of the belt by moving the carriage
(manually, if possible - otherwise at reduced speed).
If the running of the belt is correct according to the above
definition:
3. Replace the dust cover (63).
4. Otherwise: Loosen the lock-nut (53). Loosen the
tensioning screw (51) anti-clockwise in small stages on
the side on which the timing belt continually appears, until
the timing belt runs in accordance with the above
definition.
5. Tighten the lock-nuts (53) and replace the dust cover (63).
5.4 See Appendix A for screw torque values
