Pfaff 937 - Torsion spring of the differentiation regulating shaft

Adjustment
11.05.19 Torsion spring of the differentiation regulating shaft
Requirement
With the presser foot raised, the stitch length set at “0“, adjustment wheel 3 at + 4.5 and
adjustment wheel 4 at “0“, guide pin 1 must be touching in connecting link 2.
11 - 21
1
0
2
3
4
6
5
7
2
1
Fig. 11 - 20
● Loosen screw 6 a little.
● Turn torsion spring 7 in accordance with the requirement using nut 5.
● Tighten screw 6.