4-6.Thread Tension Adjustment

Set the balance of the tension as weak as possible. To tighten the tension, turn tension dial to a higher number.

To loosen the tension, turn tension dial to a lower number.

®Left needle thread tension © Right needle thread tension © Upper looper thread teqsion

Lower looper thread tension

(1) Correct tension.

Lower looper thread and upper thread should be well balanced with same tension. (Both looper threads should make crosses at the edge of the fabric.)

Needle thread should not be slacken, or pulled.

(2)Unbalanced upper looper thread wraps round and over the back:

Tighten the thread tension of the upper looper (Dial

©)or loosen the thread tension of the lower looper (Dial ©).

looper

thread

Right needle thread

Upper looper thread

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White 634D manual Thread Tension Adjustment, Right needle thread

634D specifications

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