Pfaff 939 U - Torsion Spring of the Differentiation Regulating Shaft on the PFAFF 939 U

12 - 27
Adjustment
● Turn torsion spring 1 (screw 2) in accordance with the requirement using nut 3.
Fig. 12 - 26
12.05.25 Torsion spring of the differentiation regulating shaft on the PFAFF 939 U
Requirement
With the presser foot raised, the stitch length set at "0", adjustment wheel 4 at + 4.5 and
adjustment wheel 5 at "0", guide pin 6 must be touching in connecting link 7.
4
5
3
2
1
6
7