2-11
TROUBLESHOOTING
S-101
Revised 09/2004
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1. END OF UPPER THREAD IS
INSUFFICIENT FOR A PROPER
START:
A) Pick -up Hook 10.1207 missing the thread.
Felt 10.1213 may need replacing.
B) Burr on hook of Pick-up Hook 10.1207.
Remove burr.
C) Cutting Lever out of center. Centralize, see
Sheet 14, Fig. 2 for adjustment instructions.
D) Adjust Plate 10.1204 for more dip. See
Sheet 24, Fig. 2, for adjustment instructions.
E) Pick-up Hook 10.1207 broken. REPLACE.
F) Upper Thread Draw-off out of adjustment
See Sheet 24, Fig. 1 for adjustment instructions.
G) Throat Plate 10.4012.0.013 sharp. Smooth.
H) Under surface of the right hand portion of
the notch in upper Shear Blade 10.2207.0.350
adjacent the cutting edge, is too sharp.
Round and smooth this part of Shear Blade
edge.
2. END OF UPPER THREAD TOO
LONG:
A) Upper Thread Draw-off out of adjustment.
See sheet 24, Fig. 1 for adjustment instructions.
3. LENGTH OF UNDER THREAD
SHORT FOR A PROPER START:
A) Check adjustment according to instructions
on Sheet 24, Fig. 3 and Sheet 25, Fig. 1, 2,
3, 4, 5.
B) Throat Plate 10.4012.0.013 burred or sharp.
Smooth.
C) Check Spring 01.5043 too lively. Reduce
movement by adjusting Stop Wire 10.4211
inward. See Sheet 25, Fig. 3, 4, for adjustment
instructions.
D) Thread Guide 10.4212 not high enough.
Adjust according to instructions on Sheet 25,
Fig. 5.
E) Upper Thread Draw-off needs checking. It
may not be pulling off enough upper thread,
contributing largely to the missing of the under
thread. Adjust for more thread according to
instructions on Sheet 24, Fig. 1.
F) Left Looper groved, bent or too slow.
REPLACE Looper, or speed up if slow. See
Sheet 12, Fig. 5, for adjustment instructions.
4. UNDER THREAD CREEPING
UNDER THE FORK IN SPREADER:
A) Left Spreader too high or low. Follow
instructions in Trouble Digest under heading
(21) “Skipping Stitches” at J.
B) Fork in Left Spreader short. REPLACE.
C) Upper thread not slipping over shoulder on
Left Looper fast enough, thus forcing the
under thread under the fork of the Left
Spreader at the narrow point of Looper.
Very important to have the upper thread
slide freely on Left Looper. Follow
instructions in Trouble Digest under heading
(21) “Skipping Stitches” at K, and note
C a u t i o n
.
5. END OF CORD TOO LONG FOR
START
A) Not enough tension on Clinch Spring
10.4209. Adjust according to instructions on
Sheet 26, Fig. 1, 2.
B) Clinch Spring 10.4209 bent. REPLACE or
bend back: inward or outward as required.
C) Adjust Stop 10.4220 downward according
to instructions on Sheet 26, Fig. 1.
D) Cord catching under the back of Upper
Shear Blade 10.2207.0.350. Clear away
interfering portion of Shear.
E) Side of cord hole in Throat Plate 10.42012
sharp or cord hole too small. String out.