Table 4-4.—Troubieshooting Chart-Continued
Trouble
Probable Cause
Remedy
F A I L U RE
Feed-driving crank loose
Tighten Pinch Screw.
TO FEED
S T I T C H ES
Insufficient presser foot pressure
Add spring pressure.
NOT IN LINE
Presser bar improperly set
Adjust presser bar.
Feed dogs too low
Set height to one full tooth.
M A T E R I A L
Presser foot pressure too great
Reduce pressure.
DAMAGED BY
S C U F F I NG
Feed dogs too high
Set one full tooth or less.
S L U G G I SH
Improper oil or accumulation of
Clean with recommended solvent.
O P E R A T I ON
foreign matter
FAILURE TO
Needle in backwards
MAKE A
S T I T CH
Needle threaded from wrong side
Wrong variety of needle
Bent needle
Needle not all the way in the
needlebar
Needlebar out of adjustment
Shuttle driver pin sheared
Shuttle too far from needle
Install correctly.
Thread correctly.
Change to correct length needle.
Change.
Insert correctly.
Adjust needlebar.
Replace pin.
Shim shuttle closer to needle.
1. Stitching Problems
FAILURE TO
Needle in backwards
Remove and reinstall.
MAKE A
S T I T CH
Machine out of time
Inspect and retime.
Needle threaded from wrong side
Thread correctly.
Hook too far away from needle
Reset hook saddle.
4-13
