Bernina service information
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Timings model 830
Timings 1130 1230 series
Timing model 170The pin length for timing pin "43" is 49.5mm. It is 5.5mm in diameter. The other pins just require the right diameter to fit in each pinning hole.
Timing model 180The pin length for timing pin "43" is 49.5mm. It is 5.5mm in diameter. The other pins just require the right diameter to fit in each pinning hole.
Tensions model 830
To check the bobbin tension, insert a bobbin wound with medium weight thread into the bobbin case. Remove the hook from the machine. Snap the bobbin case onto the hook. Hold the hook and bobbin case by the bobbin thread and jerk the thread once or twice. The bobbin and hook should move down a bit. If the hook does not stop moving down the tension is too loose. If the hook does not move the tension is too tight.
If the tension is too tight, turn the screw counterclockwise ¼ turn at a time and retest. If the tension is too loose, turn the screw clockwise ¼ turn at a time and retest.Continue to loosen or tighten the tension screw until the hook only moves down about ½” when you jerk the thread.
It is rare that you have to adjust your bobbin tension. Mainly if the tension spring was bent or for specialty sewing.
Top tension
The top tension is controlled with the tension dial. Normal tension is when the indicator is centered. After the bobbin tension is set the tensions should balance in the center of the fabric as shown.
If adjustment is required, sew a test and turn the top tension dial until the right tension is achieved. Open the top cover and locate the adjusting screw. Loosen the screw and center the indicator. Tighten the screw and recheck the adjustment.Your machine will sew on most fabrics without requiring tension adjustment. If you are using heavier thread or very thick fabric you may have to increase the tension.
The result you should look for in tension is for the knot to be formed in the center of the fabric.
Tensions 1130 1230
Tensions model 170 180
