Name: Pfaff 939 U
Brand: Pfaff
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Instruction Manual

296-12-18 603/002

Betriebsanleitung engl. 01.05

This instruction manual applies to machines from the

following serial numbers onwards:

# 2660862

-2/02

-2/03

939 U

3704

Instruction Manual1
Table of Contents3
Contents4
Safety7
Regulations7
General Notes on Safety7
Safety Symbols8
Important Notes for the User8
Notes for Operating and Technical Staff9
Operating Staff9
Technical Staff9
Danger10
Proper Use11
Specifications12
Disposal of Machine13
Transportation, Packing and Storage14
Transportation to Customer's Premises14
Transportation Inside the Customer's Premises14
Disposal of Packing Materials14
Storage14
Explanation of Symbols15
Controls16
Main Switch16
Keys on the Machine Head (Only on Machines with Quick-Flange Motor)16
Pedal on the PFAFF 939 U17
Pedal on the PFAFF 3704-217
Lever for Raising Presser Foot18
Knee Lever (Only on the PFAFF 939 U)18
Adjustment Lever for Zigzag Stitch and Needle Position19
Reverse-Feed Key19
Stitch Length Adjustment Wheel20
Adjustment Wheels for the Top Feed (Only on the PFAFF 939 U)20
Adjustment Lever for the Differential Feed (Only on the PFAFF 3704-221
Adjustment Wheel for Multi-Stitch and Zigzag Stitch (Only on the PFAFF 939 U)21
Mechanical Edge Guide (Only on the PFAFF 3704-2/02)22
Knee Switch (Only on the PFAFF 3704-222
Control Panel (Only on Machines with Quick-Eco-Drive Motor)23
Screen Displays23
Function Keys23
Installation and Commissioning25
Installation25
Adjusting the Table Height25
Fitting the Top Belt Guard (Only on the PFAFF 939 U)26
Fitting the Reel Stand26
Fitting the Quick-Flange Motor (Only on the PFAFF 939 U)27
Fit the Belt Guard of the Quick Flange-Motor27
- Table Top Cutout for the PFAFF 939 U28
- Table Top Assembly for the PFAFF 939 U29
Connecting the Plug-In Connections and Earth Cables30
Commissioning31
Switching the Machine On/Off31
Basic Setting of the Machine Drive Unit32
- (Only on Machines with Quick-Eco-Drive-Motor)32
Mounting/Connecting the Start Inhibitor (Only on Machines with Quick-Anbaumotor)34
Setting up35
Inserting the Needle35
Winding the Bobbin Thread; Adjusting the Primary Thread Tension36
Removing/Inserting the Bobbin Case37
Threading the Bobbin Case, Adjusting the Thread Tension37
Threading the Needle Thread / Adjusting the Needle Thread Tension38
- On the PFAFF 939 U and PFAFF 3704-2/0338
- On the PFAFF 3704-2/0239
Setting the Zigzag Stitch and the Stitch Position40
Adjusting the Stitch Length40
Adjusting the Differential Feed on the PFAFF 939 U41
Sewing Without Fullness41
Ständig Mehrweite Einarbeiten41
Applying Fullness Intermittently42
Constantly Stretch the Top Material Ply42
Adjusting the Differential Feed on the PFAFF 3704-243
- Adjusting the Multi-Stitch or the Zigzag Stitch (on the PFAFF 939 U with Quick-Flange Motor)44
Changing from Zigzag Stitch to Multi-Stitch44
Changing from Multi-Stitch to Zigzag Stitch44
Entering Start and End Backtacks or Condensed Stitches45
Sewing (Only on Machines with Quick-Eco-Drive-Motoren)46
Darning Program47
Counted Seam47
Error Messages48
Example of a Seam on the PFAFF 3704-2/0248
Care and Maintenance49
Cleaning49
Lubricating the Hook50
Oiling the Zigzag Drive51
Cleaning the Air Filter of the Air-Filter / Lubricator52
Checking/Adjusting the Air Pressure52
Adjustment53
Notes on Adjustment53
Tools, Gauges and Other Accessories for Adjusting53
Abbreviations53
Check and Adjustment Aid54
Adjusting the Basic Machine55
Balancing Weight55
Centering the Needle in the Needle Hole (in Sewing Direction)56
Parallel Guiding of the Needle Bar57
Locking Lever58
Zero Stitch and Zigzag Stitch Scale59
Centering the Needle in the Needle Hole (Crosswise to Sewing Direction)60
Zigzag Stitch Width61
Multi-Stitch Movement (Only on the PFAFF 939 U)62
Zigzag Stitch Movement (Only on the PFAFF 3704-263
Needle Penetration Symmetry (Only on the PFAFF 3704-264
Zigzag Movement (Only on the PFAFF 939 U)65
Target Positioning Sensor (Only on the PFAFF 939 U)66
Needle Position Adjustment Lever67
Adjustment Wheels for Differential Feed (Only on the PFAFF 939 U)68
Zeroing the Differentiatio (Only on the PFAFF 939 U)69
Differential Feed Synchronisation (Only on the PFAFF 3704-270
Position of the Stitch Length Adjustment Wheel on the PFAFF 939 U71
Position of the Stitch Length Adjustment Wheel on the PFAFF 3704-272
Zeroing the Main Feed (Rear Feed Dog) on the PFAFF 939 U73
Zeroing the Main Feed (Rear Feed Dog) on the PFAFF 3704-274
Zeroing the Differential Feed (Front Feed Dog) on the PFAFF 939 U75
Zeroing the Differential Feed (Front Feed Dog) on the PFAFF 3704-276
Torsion Spring of the Reverse Feed Lever on the PFAFF 939 U77
Torsion Spring of the Reverse Feed Lever on the PFAFF 3704-278
Torsion Spring of the Differentiation Regulating Shaft on the PFAFF 939 U79
Torsion Spring of the Differentiation Regulating Shaft on the PFAFF 3704-280
Feeding Motion of the Main and Differential Feeds81
Lifting Stroke of the Main and Differential Feed Dogs82
Height of the Main and Differential Feed Dogs83
Drive Belt in the Gearbox Housing84
Hook Bearing Bracket85
Hook Lubrication86
Pre-Adjusting the Needle Height87
Needle Rise, Hook-To-Needle Clearance and Bobbin Case Positioning-Finger88
Final Adjustment of the Needle Height89
Bobbin Case Opener Position90
Bobbin Case Opener Motion91
Presser Foot to Needle Plate Clearance / Presser Foot Pressure92
Thread Diverter Pin93
Limiting the Knee Lever Stroke94
Knee Lever Play95
Bobbin Winder96
Stitch Condensation (Only on the PFAFF 3704-2/02)97
Switching to Reverse Feed (Only on the PFAFF 3704-2/03)98
Thread Puller (Only on the PFAFF 3704-2/02)99
Adjusting the Thread Trimmer -900/24100
Axial Position of the Control Cam100
Preliminary Adjustment of the Control Cam101
Position of the Thread Catcher and Cutting Test102
Readjustment of the Control Cam103
Needle Thread Tension Release104
Parameter Settings105
Selecting the User Level105
Example of a Parameter Input106
Liste der Parameter107
Explanation of the Error Signals108
Reset / Cold Start109
Internet Update of the Machine Software110
Wearing Parts111
Circuit Diagrams114

Brand	Pfaff
Model	939 U
Category	Sewing Machine
Language	English

Pfaff 939 U User Manual

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