Pfaff 138 Sewing Machine Instruction Book

Pfaff 138 Instruction and Service Manual

• Covers 1970s Pfaff 138 industrial sewing machines, specifically models A and B variants for light-to-medium weight material configurations
• Official Pfaff multilingual instruction publication, referencing parts documentation and adjustment parameters for the 91-041 420-05 series
• Contains 39 pages of technical diagrams, machine schematics, exploded-view parts indexes, and detailed thread tension adjustment tables
• Delivered as a direct download the moment payment clears
• Stored against your account so you can retrieve it after a hard-drive loss
• Print resolution preserves exploded-view detail
• Indexed PDF search covers every chapter and appendix
• Full-text search finds any part number in seconds
• This 1970s edition documents the machine-specific needle system requirements for subclass variants including the 438 KK and 130 B systems

Operating Parameters and Maintenance

This 39-page Pfaff 138 instruction manual outlines essential daily operational requirements including machine cleaning, hook area maintenance, and periodic lubrication. The content details the correct threading sequences for both the needle and bobbin, alongside visual guides for tension regulation to achieve proper stitch formation. Users will find guidance on adjusting needle positions, controlling presser foot pressure, and setting stitch length for various fabric thicknesses. The document serves as a reference for understanding factory workshop documentation related to internal machine settings and external device compatibility.

Technical Specifications and Adjustments

Machine configuration data lists needle system compatibility by subclass, with ranges including 438 KK, 130 B, and 134 EK. Needle gauge for the Pfaff 138 is documented as adjustable between 2 mm and 6 mm depending on the specific machine version. The manual provides reference values for the cleaning of the hook raceway and the removal of the hook gib. Maintenance intervals specify daily lubrication of oil points using oil with a viscosity of 15.0 mm²/s at 50°C and an annual application of soda soap grease. Threading diagrams illustrate the routing for the needle and bobbin winding, while the section on needle size and thread weight provides a reference for matching material density to needle count. A dedicated section on troubleshooting covers common irregularities like needle breakage and stitch skipping, providing causes such as incorrect needle positioning or excessive thread tension. This official 39-page Pfaff OEM manual is the definitive resource for 1970s Pfaff 138 machine owners, detailing adjustments for feed settings, tension mechanisms, and specialized attachments for buttonholes and cording.