– 60 –
6-2) The lower looper does
2-A) Looper
A-1) The blade shape is not
Use an authorized part.
not pick up the left
proper.
middle needle thread.
2-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
2-C) Needle thread support plate
C-1) Improper loop timing due
Use the needle thread support plate to adjut the
to no use of the needle
height properly. Refer to the standard adjustment
thread support plate
values.
2-D) Needle thread guide bar
D-1) Excessive height of the
Adjust the height properly. Refer to the standard
needle thread guide bar
adjustment values.
2-E) Needle height
E-1) Improper needle bar height
Use the needle bar height gauge to adjust the
height. Refer to the standard adjustment values.
2-F) Threading
F-1) Threading error
Refer to "6. How to conduct threading".
2-G) Upper fancy looper
G-1) Excessive thread tension
Reduce the thread tension
of the upper fancy looper
Refer to the standard adjustment values.
2-H) Needle heat
H-1) Error-prone in artificial fiber
Use the silicone oil lubricating unit.
2-I) Lower looper adjustment
I-1) Improper clearance between
Refer to the standard adjustment values.
the left needle and lower
Increase the looper return.
looper or too short looper
return
2-J) Rear needle guide
J-1) Improper contact level
Refer to the standard adjustment values.
between the left needle
and rear needle guide
2-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
From the previous page
To the next page
Trouble (1)
Trouble (2)
Cause (1)
Cause (2)
Check and corrective measures
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
