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6-3) The lower looper does
3-A) Looper
A-1) The blade shape is not .
Use an authorized part.
not pick up the right
proper
middle needle thread.
3-B) Needle
B-1) Needle bent or wrong
Replace the needle or mount the needle again
mounting direction
so that the flat section of the needle shank faces
the front. UY118GKS/UY118GAS
3-C) Needle thread support plate
C-1) In use
Do not use the needle thread support plate, or
examine whether or not to use the plate only for
flexible thread.
3-D) Needle thread guide bar
D-1) Insufficient height of the
Adjust the height properly. Refer to the standard
needle thread guide bar
adjustment values.
3-E) Needle height
E-1) Improper needle bar
Use the needle bar height gauge to adjust the
height
height. Refer to the standard adjustment values.
3-F) Threading
F-1) Threading error
Refer to "6. How to conduct threading".
3-G) Upper fancy looper
G-1) Excessive thread tension
Reduce the thread tension. Refer to the standard
of the upper fancy looper
adjustment values.
3-H) Needle heat
H-1) Error-prone in artificial fiber
Use the silicone oil lubricating unit.
3-I) Lower looper adjustment
I-1) Improper clearance between
Increase the looper return.
the left needle and lower
Refer to the standard adjustment values.
looper or too short looper
return
3-J) Rear needle guide
J-1) Improper rear needle guide
Check the height of the main feed dog.
height or improper contact
Refer to the standard adjustment values.
level between the left needle
and rear needle guide
3-K) Front movable needle guide
K-1) Improper contact level
Refer to the standard adjustment values.
between the left needle
and front movable needle
guide
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Trouble (1)
Trouble (2)
Cause (1)
Cause (2)
Check and corrective measures
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
