Hook Drive Belt Tension - Bernina B 590 Service And Maintenance Manual

5.1.3 Hook drive belt tension

Note:
Check condition of hook drive belt when removing the clutch carriage and/or hook drive.
Check:
• Belt tensioner c (033108.70.00) must be flush with
freearm frame surface. Deviation of max. -0.5mm is
possible.
Note:
To avoid stiff running, the drive belt mustn't be too taut.
Adjustment:
• Before removing the belt tensioner, we recommend
to mark b the position to be able to find the best
adjustment point from the beginning when refitting
the belt (pict. 1).
• Untightening screw d allows for moving the belt
tensioner up and down. Moving up slackens the
tension, moving down tightens the tension (pict. 2).
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