Adjustment Of Hook-To-Needle Clearance - Pfaff performance 2054 Service Manual

12. Adjustment of hook-to-needle clearance

Requirement:
At the straight stitch setting the distance of the sewing hook point from the bottom of the scarf in the
needle must be 0.05 mm (fig. 31).
In the widest zigzag stitch, the sewing hook point must almost touch the needle.
Check:
• Remove the baseplate and the free-arm lid.
• Remove the needle.
• Remove the presser foot.
• Remove the bobbin case.
• Remove the bobbin case position finger.
• Move the bobbin case base so that the hook point is exposed.
• Insert a new needle system 130/705 H size Nm 80.
• Select straight stitch program „01".
• Turn the handwheel until the hook point is opposite the center line of the needle.
• Check the distance between hook point and needle scarf.
• Check the axial play of hook 56 to hook shaft bush 57 (fig. 32).
Adjustment:
• If the hook shaft has axial play, loosen the two screws 58.
• Press bevel gear 59 with the shaft to the front and push sewing hook 56 to the rear.
• Tighten the two screws 58.
• Loosen screw 60 in the lifting eccentric by 2 - 3 turns.
• Loosen screw 61 slightly.
• Turn the handwheel and the sewing hook until the hook point is opposite the middle of the needle
scarf.
• Shift the sewing hook complete with hook shaft bush 57 until the distance of the sewing hook point to
the bottom of the scarf in the needle is 0.05 mm.
• Tighten screw 61 on the narrow flat of the hook bush.
Note:
The large flat of the hook shaft bush must face the right.
Cross-check:
• Check for free movement of the hook shaft.
• Check again the distance between the sewing hook point and the bottom of the needle scarf.
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