Beisler 739-23-1 Service Manual - Manual (Page 9)

2.6 Hook drive housing
Caution! Risk of injury!
Switch off main switch.
Check and adjust position of hook drive housing only when the sewing
machine is switched off.
Instruction and inspection
The hook drive housing 6 is factory-aligned.
Only adjust the housing in exceptional circumstances!
If the hook drive housing is correctly aligned, the distance between the
back of the hook 2 and the set collar 1 must be approx. 0.4 mm.
The distance between the throat plate support and the thread tension
plate 5 must be 3.7 mm.
Use gauge 4 (order no. 0271 000767) to measure these distances.
Adjustment
Height of hook drive housing
–
Remove counter screw 3.
Below the counter screw lies a stop screw.
– Loosen securing screws 6 of the hook drive housing 7.
– Adjust stop screw.
The distance between the throat plate support and the thread
tension plate 5 is 3.7 mm.
– Measure distance with gauge 4.
– Tighten securing screws 6 of the hook drive housing 7.
– Tighten counterscrew 3.
3-9
3 2 1 5 4
7 6