Pfaff 138 Sewing Machine Instruction Book

• Covers 1970s Pfaff 138 industrial sewing machines, focusing on the A and B variants for light-to-medium weight material configurations
• Official multilingual documentation referencing parts, schemas, and adjustment parameters for the 91-041 420-05 series
• Features 39 pages of exploded-view parts indexes, technical diagrams, and detailed thread tension adjustment tables
• Documents machine-specific needle system requirements for subclass variants, including the 438 KK and 130 B systems

Operating Parameters and Maintenance

This 39-page instruction manual outlines the essential daily operational requirements for the Pfaff 138. It covers routine machine cleaning, hook area maintenance, and periodic lubrication schedules. You will find detailed threading sequences for both the needle and bobbin. The manual also includes visual guides for regulating thread tension to ensure proper stitch formation across different fabrics. Need to adjust needle positions, control presser foot pressure, or set stitch lengths for varying material thicknesses? The documentation provides the exact factory baselines. Always disconnect the machine from power before performing any internal adjustments to avoid injury.

Technical Specifications and Adjustments

Machine configuration data breaks down needle system compatibility by subclass. Supported ranges include the 438 KK, 130 B, and 134 EK systems. The needle gauge is adjustable between 2 mm and 6 mm depending on your specific version. Want to keep your hook mechanism running smoothly? The guide provides reference values for cleaning the hook raceway and safely removing the hook gib. It strictly specifies maintenance intervals. For example, daily lubrication of oil points requires oil with a viscosity of 15.0 mm²/s at 50°C, while soda soap grease is required annually. Clear threading diagrams map the exact routing for the needle and bobbin winder. If you are matching material density to needle count, the manual offers a reliable reference table. A dedicated troubleshooting section helps diagnose common irregularities like skipped stitches or needle breakage, tracing them back to incorrect positioning or tension faults. From feed settings to specialized attachments for buttonholes and cording, this OEM documentation provides the technical depth required to maintain 1970s Pfaff 138 machines in a professional workshop environment.