47
Troubleshooting
4
77
Cause of troubles and troubleshooting
No
1
2
3
Problems
Abnormal operation or
driving of the machine
Causes
Excessive loosening of belt tension or
damaged belt
Fuse shortage in the main
power or circuit
Deviation of the feed bracket
from the X or Y threshold
Adjust the belt tension or exchange the belt
Check the fuse shortage of the main shaft
driving motor in the control box for replacement
Incorrect stop position
Loose main driving belt
Improper position of the synchronizer
Control the belt tension
Adjust the position of the synchronizer
Needle breaks
Insert the thread properly
5
Skipped stitches
Damaged needle (bent needle, cracks on
the needle eye or the groove, abrasion or
distortion of the needle tip)
Replace the needle
Move the feed bracket to its normal position
(within the range of the threshold switch)
Wrong installation of the needle Install the needle correctly
Needle contacting the shuttle
Control the clearance between the needle and the shuttle
Thread breaks Incorrect insertion of threads
Wrong installation of the needle (Needle
height or direction)
Reinsert the needle
Damaged needle (bent needle, cracks on
the needle eye or the groove, abrasion or
distortion of the needle tip)
Replace the needle
Excessive tension of upper and lower threads
Control the tension
Excessive tension and
stroke of the thread take-up lever spring
Control the tension and stroke
of the thread take-up lever spring
Cracks on the controlling hole of the
shuttle surface spring
Replace the shuttle surface spring
Bent needle used Replace the needle
Improper needle size for threads used Replace the needle
Wrong installation of the needle Reinstall the needle
Improper timing of the needle and the shuttle
Adjust the timing of the needle and the shuttle
Wide clearance between the groove and the shuttle point
Adjust the timing of the needle and the shuttle
Excessive tension and stroke of thread
take-up lever spring
Adjust the tension and stroke of the thread
take-up lever spring
1) Machine parts
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