Troubleshooting Condition Cause Reference

Troubleshooting
Condition		Cause	Reference
Condition		Cause	Reference
The needle thread	1.	The needle thread is not threaded properly.	Page 11
breaks.	2.	The needle thread tension is too tight.	Page 15
	3.	The needle is bent or blunt.	Page 7
	4.	The needle is incorrectly inserted.	Page 7
	5.	The needle thread and the bobbin thread are not drawn to
		the rear and set properly under the presser foot when
		starting sewing.	Page 16
	6.	The fabric is not drawn to the rear when sewing is finished.	Page 16
	7.	The thread is too heavy or too fine for the needle.	Page 7

The bobbin thread	1.	The bobbin thread is not threaded properly in the bobbin
breaks.		holder.	Page 10
	2.	Lint has collected in the bobbin holder.	Page 32
	3.	The bobbin is damaged and does not turn smoothly.	Replace the bobbin
	4. The thread is wound loosely on the bobbin.		Re-wind the bobbin.

The needle breaks.	1.	Needle is incorrectly inserted.	Page 7
	2.	The needle is bent or blunt.	Page 7
	3.	The needle clamp screw is loose.	Page 7
	4.	A proper foot is not used.	Use proper foot.
	5.	The fabric is not drawn to the rear when sewing is finished.	Page 16
	6.	The needle is too fine for the fabric being sewn.	Page 7

The needle thread	1.	The needle thread tension is too loose.	Page 15
loops.	2. The needle size is not suitable for the thread.		Page 7

Skipped stitches	1.	The needle is incorrectly inserted.	Page 7
	2.	The needle is bent or blunt.	Page 7
	3.	The needle and/or thread are not suitable for the fabric
		being sewn.	Page 7
	4.	A blue tip needle is not used for sewing stretch, very fine
		fabrics and synthetics.	Page 7
	5.	The needle thread is not threaded properly.	Page 11
	6.	A poor quality needle is used.	Replace the needle

Seam puckering	1.	The needle thread tension is too tight.	Page15
	2.	The needle thread is not threaded properly.	Page 11
	3.	The needle is too heavy for the fabric being sewn.	Page 7
	4.	The stitch length is too long for the fabric.	Make stitch shorter
	* Use a stabilizer for very fine fabrics.

The cloth is not fed	1.	The feed dog is packed with lint.	Page 32
smoothly.	2.	The stitches are too fine.	Make stitch longer
	3.	The feed dog was not raised after being lowered.	Page 5
	4.	The foot pressure is not adjusted properly.	Page 5

The machine does	1.	The machine is not plugged in.	Page 4
not work.	2.	Thread is caught in the hook race.	Page 32
	3.	The handwheel is pulled for bobbin winding.	Page 9

Patterns are distorted.	1.	The stitch is not balanced.	Page 14

The buttonhole is	1.	The stitch density is not suitable for the fabric being sewn.	Page 22
not sewn well.	2.	Interfacing is not being used with stretch fabrics.	Page Use interfacing

Noisy operation	1.	The feed dog is packed with lint.	Page 32
	2. Lint has collected in the bobbin holder.		Page 32

7318 specifications

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Troubleshooting

Condition

Cause

Reference

breaks.

The needle breaks.

Skipped stitches

Seam puckering

smoothly.

not work.

7318 specifications