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938

Pfaff 938 Adjustment Manual

Name: Pfaff 938
Brand: Pfaff
Rating: 4 (1 reviews)

54 pages

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ADJUSTMENT MANUAL

296-12-18 998/002

Justieranleitung engl. 06.12

This Adjustment Manual is valid for machines

from the following serial numbers onwards:

# 2 671 899

918

938 U

938

938 U

Table of Contents3
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
Zigzag Stitch Movement (Only on the 918 and 938)14
Needle Penetration Symmetry - Left, Centre and Right (Only on the 918 and 938)15
Multi-Stitch Movement (Only on the 918U and 938U)16
Zigzag Movement (Only on the 918U and 938U)17
Target Positioning Sensor (Only on the 918U and 938U)18
Needle Position Adjustment Lever19
Zero Position of the Bottom Feed Dog (with Closed Gear Box)20
Zeroing the Bottom Feed (with Open Gearbox)21
Feeding Motion of the Bottom Feed Dog22
Lifting Motion of the Bottom Feed Dog23
Drive Belt in the Gearbox Housing24
Hook Bearing Bracket25
Hook Lubrication26
Pre-Adjusting the Needle Height27
Needle Rise, Hook-To-Needle Clearance and Bobbin Case Positioning-Fi Nger28
Final Adjustment of the Needle Height29
Bobbin Case Opener Position30
Bobbin Case Opener Motion31
Bottom Feed Dog Height32
Presser Foot to Needle Plate Clearance33
Presser Foot Pressure34
Needle Thread Tension Release (on Machines Without -900/24)35
Thread Diverter Pin36
Limiting the Knee Lever Stroke37
Knee Lever Play38
Bobbin Winder39
Adjusting the Underedge Trimmer -771//0540
Resting Position of the Knife40
Knife Height41
Positioning of the Knife42
Knife Drive Switch43
Workpiece Guard44
Adjusting the Thread Trimmer -900/2445
Axial Position of the Control Cam45
Preliminary Adjustment of the Control Cam46
Position of the Thread Catcher and Cutting Test47
Readjustment of the Control Cam48
Needle Thread Tension Release49
Circuit Diagrams50

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Pfaff 938 Specifications

General

Brand	Pfaff
Model	938
Category	Sewing Machine
Language	English

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