Upper Thread Tension - Pfaff ambition essential 1.0 Service Manual

24.Upper thread tension

Check
A correct interlacing of the upper thread and the bobbin thread (cotton thread 50/2 or synthetic fi ber
thread 100/35) must take place approximately in the middle of the fabric at straight and zigzag stitch
setting with the tension dial at "4".
Alt. Check
The standard upper thread tension should be between 70~80 grams when pulling a cotton thread 50/2
or synthetic fi ber thread 100/35 with the tension dial at "4". The presser foot should be lowered when
checking the upper thread tension.
Adjustment
1. Set the dial tension at "4".
2. Use a lead weight or a tension gauge as a setting gauge to take the measurement.
3. Put dial tension thread into gauge's hook and pull, the standard range should be 70~80g.
4. Remove the face cover and the front cover.
5. Turn the plastic screw (b) in the direction of (c) when the upper thread tension is too tight. ( ill 3).
Turn the plastic screw (b) in the direction of (d) when the upper thread tension is too loose. ( ill 3)
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Settings
3
104 73 15-26
d
b
c