Pfaff 138 Sewing Machine Instruction Book

This service manual for the Pfaff 138 sewing machine covers all aspects of operation and maintenance. Included are sections on threading, bobbin winding, tension settings, and specialized stitch functions. Part Number 91-041 420-05.

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Document Details

Document Number / Seller:: 25273 / Betty Miller
File Size:: 7.46 MB
File Type:: ZIP
Language:: English, German, Spanish, Italian
Pages:: 39
Printable:: Yes
Category:: Sewing Machine
Last updated / verified: Sep 23, 2025

Models Covered & Key Technical Specifications

Pfaff 138 Sewing Machine (91-041 420-05) - 1970s Operation and Maintenance | Sewing Machine Library

Reference Output Performance: 39 pages establish the complete documentation.
Approved Linear Velocity: The machine operates at speeds up to 6000 stitches per minute.
Designated Gross Dimensions: Machine dimensions are 18 x 7 x 12 inches.
Essential Rotational Force: The motor requires 110-120V input power.
Baseline Play Limits: Not applicable for this sewing machine model.
Fundamental Burn-in Temperature: Not applicable for this sewing machine model.

Manual Description & Preview

Pfaff 138 Sewing Machine Instruction Book: Comprehensive PDF

Unit-Designations: Pfaff 138 Sewing Machine // Operational-Framework: Sewing Machine / Instruction Manual Logic // Calibration-Scope: Operational Procedures.

Technical Specifications

Integrated-Framework	Rating	Context
Language Availability	Multi-language	English, German, Spanish, Italian
File Size	7.46244 MB	Digital document size
Document Type	Instruction Manual	Official operating guide

Systems and Procedures

Setup and Initial Operation

The service manual covers initial setup procedures, including machine cleaning and oiling on pages 4-5. It details safety instructions and important notes for first-time users.

Threading and Stitching

Comprehensive guidance is provided for threading the upper and lower threads, winding the bobbin, and inserting the needle. It documents various stitch types and their adjustment.

Maintenance and Troubleshooting

Information on cleaning the machine, regulating tensions, and troubleshooting common issues such as skipped stitches and thread breaks is included.

Specialized Attachments and Functions

The manual details the use of various presser feet and attachments for specific tasks like buttonhole sewing, quilting, and blindstitching.

Part Identification

Includes diagrams and part numbers for wear parts and accessories, aiding in identification and replacement.

Torque Statement: This manual does not specify torque values as they are not applicable to sewing machine adjustments.

FAQ

Can I find information on needle and thread size recommendations for different material weights in this manual?

Manual includes a reference chart that lists suggested needle sizes and corresponding thread types for different fabric classes. This content helps users match components for various sewing applications.

Which pages provide diagrams for the bobbin winder setup and thread paths?

Manual includes illustrations and text descriptions for the bobbin winder assembly, tension discs, and thread routing on pages 8 and 9.

What documentation exists regarding the lubrication and oiling points for the Pfaff 138?

Pages 4 and 5 contain exploded-style illustrations highlighting the specific oiling points with red markings. These sections also list maintenance frequencies for different operational environments, such as factory use.

Does the document contain diagrams for the needle system compatibility across different machine subclasses?

Manual includes a dedicated table on page 7 that lists the appropriate needle system codes corresponding to specific machine subclasses.

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