Name: Pfaff 939 U
Brand: Pfaff
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ADJUSTMENT MANUAL

296-12-18 595/002

Justieranleitung engl. 01.13

939 U

3704

-2/02

-2/03

This Adjustment Manual is valid for machines

from the following serial numbers onwards:

# 2 660 862

Table of Contents3
Adjustment5
Tools, Gauges and Other Accessories for Adjusting5
Abbreviations5
Explanation of the Symbols5
Check and Adjustment Aid6
Adjusting the Basic Machine7
Balancing Weight7
Centering the Needle in the Needle Hole (in Sewing Direction)8
Parallel Guiding of the Needle Bar9
Locking Lever10
Zero Stitch and Zigzag Stitch Scale11
Centering the Needle in the Needle Hole (Crosswise to Sewing Direction)12
Zigzag Stitch Width13
Multi-Stitch Movement (Only on the PFAFF 939U)14
Zigzag Stitch Movement (Only on the PFAFF 3704-215
Needle Penetration Symmetry - Left, Centre and Right (Only on the PFAFF 3704-216
Zigzag Movement (Only on the 939U)17
Target Positioning Sensor (Only on the 939U)18
Needle Position Adjustment Lever19
Adjustment Wheels for Differential Feed (Only on the PFAFF 939U)20
Zeroing the Differentiatio (Only on the PFAFF 939 U)21
Differential Feed Synchronisation (Only on the PFAFF 3704-222
Position of the Stitch Length Adjustment Wheel (on the PFAFF 939 U)23
Position of the Stitch Length Adjustment Wheel (on the PFAFF 3704-224
Zeroing the Main Feed (Rear Feed Dog) on the PFAFF 939 U25
Zeroing the Main Feed (Rear Feed Dog) on the PFAFF 3704-226
Zeroing the Differential Feed (Front Feed Dog) on the PFAFF 939 U27
Zeroing the Differential Feed (Front Feed Dog) on the PFAFF 3704-228
Torsion Spring of the Reverse Feed Lever (on the PFAFF 939 U)29
Torsion Spring of the Reverse Feed Lever (on the PFAFF 3704-230
Torsion Spring of the Differentiation Regulating Shaft (on the PFAFF 939 U)31
Torsion Spring of the Differentiation Regulating Shaft (on the PFAFF 3704-232
Feeding Motion of the Main and Differential Feeds33
Lifting Stroke of the Main and Differential Feed Dogs34
Height of the Main and Differential Feed Dogs35
Drive Belt in the Gearbox Housing36
Hook Bearing Bracket37
Hook Lubrication38
Pre-Adjusting the Needle Height39
Needle Rise, Hook-To-Needle Clearance and Bobbin Case Positioning-Fi Nger40
Final Adjustment of the Needle Height41
Bobbin Case Opener Position42
Bobbin Case Opener Motion43
Presser Foot to Needle Plate Clearance / Presser Foot Pressure44
Thread Diverter Pin45
Limiting the Knee Lever Stroke46
Knee Lever Play47
Bobbin Winder48
Stitch Condensation (Only on the PFAFF 3704-2/02)49
Switching to Reverse Feed (Only on the PFAFF 3704-2/03)50
Thread Puller (Only on the PFAFF 3704-2/02)51
Adjusting the Thread Trimmer -900/2452
Axial Position of the Control Cam52
Preliminary Adjustment of the Control Cam53
Position of the Thread Catcher and Cutting Test54
Readjustment of the Control Cam55
Needle Thread Tension Release56
Switch Diagrams57

Brand	Pfaff
Model	939 U
Category	Sewing Machine
Language	English

Pfaff 939 U Adjustment Manual

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