Changing The Motor Belt; Trouble Shooting - Pfaff 260 Service Manual

Changing the Motor Belt
Loosen hexagon screw h on the motor bracket (Fig. 118), til t the sprocket-end
of the motor shaft toward the bedplate, and pull the motor belt off the
sprocket. Remove the balance wheel as instructed in paragraph 6 in the pre-
ceding chapter, and exchange the old for a new driving belt.
To mount the driving belt, follow the procedure outlined in paragraphs 7
through 9 in the preceding chapter.
Trouble Shooting
1. Machine Skips Stitches
Couse:
Needle incorrectly inserted.
Wrong needle.
Needle bent.
Machine threaded improperly.
Needle too fine or too thick for the
thread.
2. Needle Thread Breaks
Cause:
The above mentioned may cause
th read breakage.
Thread tension too tig ht.
Poor or knoHy thread used.
Hook raceway is iommed with
thread or needs oiling.
Burrs or sharp edges on needle
plate slot.
Remedy:
Push needle up as for as it will go
and be sure that the long groove
faces toward you, and flat side of
shank away from you.
The correct needle system is 130 R.
For two-needle sewing jobs up to
3 /32"
needle gauge, use System 130 B
needles, and for needle gouges ex-
ceeding
3 /32",
System 130 R needles.
Insert new needle.
Check and correct threading as in-
structed on page 19.
Select correct needle from Needle
and Thread Chart on page 18.
Remedy:
See remedies listed under 1. above.
Adjust tensions as instrructed on
page 15.
Use good-quality threads only.
Clean and oil hook raceway as in-
structed on page 41 or 84.
Polish needle plate slot with fine
emery twine.
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