12 - 21
Adjustment
12.05.19 Zeroing the main feed (rear feed dog) on the PFAFF 939 U
Requirement
With the stitch length set at "0", when the balance wheel is turned, there should be no
feeding motion of the main feed dog.
Fig. 12 - 20
● Set the stitch length at "0".
● Fit the open-ended spanner (width 27) to the torsion-spring collar 1 and use it to hold
regulating shaft 2.
● Loosen screw 3.
● While constantly turning the balance wheel, adjust the spanner on the torsion-spring
collar 1 in accordance with the requirement.
● In this position, move adjustment crank 4 against the cast iron frame and tighten screw 3.
● Carry out a control in accordance with the requirement.
2
1
3
4
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