42
No.
1
3
Type of Breakdown
Error on operation or drive
of machine
Cause
Too loose belt tension and damage on belt
Troubleshooting
Adjust the belt tension or exchange it
Needle break
4
Thread is cut
5
Stitch skipping
Excessive tension of upper thread and
under thread
Adjust the tension
Excessive tension and stroke of take-up
lever spring
Adjust the tension and stroke of take-up lever
spring
Crack on the thread controlling hole of
shuttle surface spring
Exchange the shuttle surface spring
Use of bending needle
Exchange the needle
Use of needle whose size is not fit to thread Exchange the needle
Wrong installation of needle
Reinstall of needle
Improper timing and needle
Readjust the timing for a needle and shuttle
Large interval between a needle groove
and shuttle point
Readjust the timing for a needle and shuttle
Excessive tension and stroke of take-up
lever spring
Fuse shortage for main power or after
circuit
Deviation from Y and Y limit of feed bracket
Check the fuse shortage of main shaft drive
motor in a controller box, exchange it
Slackness of main drive belt
Wrong position of upper shaft sensor plate
or photo sensor
Adjust the belt tension
Adjust the position of upper shaft sensor plate or
exchange the photo sensor
Damage on needle(Bending of needle,
cracks on needle hole or groove, and
abrasion or transformation of needle tip)
Exchange the needle
Move the feed bracket to normal place (inside
limit switch)
Install the needle properly
Bad position of stopping
position
2
Adjust the distance properly between a needle
and shuttle
Contact of needle with shuttle
Wrong installation of needle
Wrong insertion of thread
Insert the thread properly
Wrong installation of needle (Needle height,
needle direction)
Reinstall the needle
Exchange the needle
Damage on needle ( Bending of needle,
cracks on needle hole or groove, and
abrasion or transformation of needle tip)
Adjust the tension and stroke of take-up lever
spring
77
CAUSE OF BREAK-DOWN AND TROUBLESHOOTING
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