Pfaff 75 Owner's Manual - Page 29
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6. Machine Works Heavily Cause: Hook raceway lacks oil or is obstructed by pieces of thread. Mechanism clogged by inferior oil. Bobbin winder working while sewing. Remedy: Clean and oil hook raceway. Use only Pfaff sewing machine oil Stop bobbin winder. never salad oil or glycerine. 7. Machine Fails to Sew Zigzag or Ornamental Stitch Desired Cause: Remedy: Wrong fashion disc inserted or none at all. Jerk stitch width lever to "O and insert proper fashion disc. For straight stitching, too, a fashion disc should be inserted in the machine (see pp. 6, 7 and 9). 8. Motor Idles Cause: Motor disengaging lever raised. Remedy: Flick lever down (see page 5). Thread Jamming The Pfaff to jam in rotary hook will not normally the hook raceway, the power jam, even if of the motor the machine should be handled improperly. If thread in most instances will be sufficient to overcome hard should happen working of the mechanism. If this action should not free the jammed thread, put a drop of oil into the hook raceway, jerk the balance wheel back, then rock it back and forth. 29