Tension Of Motor Belt And Timing Belt - promelectroavtomat ULT2003D Service Manual

3.

TENSION OF MOTOR BELT AND TIMING BELT

STANDARD
There should be a 1.5-3.5 mm slack in the motor belt when the center of the motor belt is pressed with a force of
1N (100g).
There should be a 3-4 mm slack in the timing belt when it is pressed with a force of 2N (200g).
ADJUSTMENT
Timing belt
1. Loosen the screw of the belt adjusting pulley.
2. Adjust the position of the belt adjusting pulley.
3. Tighten the screw of the belt adjusting pulley.
Motor belt
1. Loosen the two screws securing the motor holder.
2. Adjust the belt tension by moving the motor holder.
3. Tighten the two screws.
Adjustment Points
1. If the timing belt tension is too loose, the belt may jump while sewing on denim and other thicker fabrics or
overlapping fabric, or the feed timing or the closeness of the needle and rotary hook may prevent sewing.
2. If the motor belt tension is too tight, the torque becomes too much, causing the motor to rotate slower and
generate an irregular noise.
3. If the motor belt tension is too loose, the belt may jump and the upper shaft may not rotate smoothly while
sewing on denim and other thicker fabrics or overlapping fabrics, the motor may not rotate smoothly, or
the upper shaft may not rotate.
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