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Chart of thread tension adjustment, Two-needle (Four-thread)
A: Reverse B: Surface C: Left needle thread D: Right needle thread E: Upper looper thread F: Lower looper thread
Right needle
thread is loose.
Left needle
thread is tight.
Right needle
thread is tight.
Upper looper
thread is tight.
Lower looper
thread is loose.
Upper looper
thread is loose.
Lower looper
thread is tight.
Upper looper
thread is loose.
Lower looper
thread is loose.
Left needle
thread is loose.
When you adjust the
thread tension, do it in the
following order:
(1) Left needle thread
(2) Right needle thread
(3) Upper looper thread
(4) Lower looper thread
This is the easiest way to
obtain the correct thread
tension.
Tighten left
needle thread.
(yellow)
Tighten right
needle thread.
(green)
Loosen left
needle thread.
(yellow)
Loosen right
needle thread
(green)
Loosen upper
looper thread
(pink)
Tighten lower
looper thread
(blue)
Tighten upper
looper thread
(pink)
Loosen lower
looper thread
(blue)
Tighten upper
looper thread
(pink)
Tighten lower
looper thread
(blue)