Flange Machine
Part Number 6Z8303
Troubleshooting
75
Sewing Problems
The following table contains a listing of sewing problems together with possible
causes and solutions. See also
Table 9.2
Sewing Problems
Problem
Cause
Solution
Irregular stitches
Incorrect needle size
Improper threading
Loose upper thread
tension
Pulling material
Light pressure on
presser foot
Loose presser foot
Bottom thread is
looped
Bottom thread is
visible on top of
material
Use 135 x 7 #24 needle.
Rethread machine.
Tighten upper thread tension.
Do not pull material; guide it gently.
Increase pressure on presser foot.
Reset presser foot.
Tighten upper tension.
Loosen upper tension.
Breaking needles
Pulling material
Incorrect needle size
Loose presser foot
Do not pull material; guide it gently.
Use 135 x 7 #24 needle.
Reset presser foot.
Material becomes
obstructed
Knives dull or set
improperly
Lower feeds dropped
Dull feeds
Weak pressure
springs
Replace or reset knives.
Raise feed to full tooth.
Replace feeds.
Replace springs.
Material feeds
poorly
Worn or dull feeds
Stitch length set
incorrectly
Top feed linkage set
incorrectly
Worn pressure
springs
Replace feeds.
Set to longest stitch.
Check top feed setting.
Replace pressure springs.
Bunching of
thread
Feed down
Raise feed.