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

5.1.2 Drive motor belt tension

Check:
• With a pressure of approx. 500g onto the belt center a, the belt mustn't move more than ca. 8mm.
Adjustment:
• Remove the two motor fastening screws a and b (T20 M4X12 u-washer 4.2x14x1.5).
• Turn motor clockwise until specified value has been reached. Turn motor counterclockwise to slacken
belt tension.
• Retighten fastening screws a and b.
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