39500AU - Sewing machine Union Special - Free user manual and instructions
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| Product Type | Industrial Sewing Machine |
| Brand | Union Special |
| Model | 39500AU |
| Category | Sewing Machine |
| Dimensions (approx.) | 500 x 300 x 400 mm |
| Weight (approx.) | 30 kg |
| Power Supply | 220-240 V, 50/60 Hz |
| Power Consumption | 400 W |
| Sewing Speed | Up to 4000 stitches/min |
| Stitch Type | Lockstitch |
| Needle System | 134 or 135×17 |
| Max Stitch Length | 5 mm |
| Presser Foot Lift | Manual or knee lift |
| Lubrication | Automatic oil system |
| Key Features | High-speed, durable, heavy fabric capability |
| Maintenance | Regular oiling and cleaning |
| Safety Features | Safety clutch, finger guard |
| Spare Parts Availability | Needles, bobbins, feed dogs, etc. |
| Repairability | Serviceable by qualified technicians |
Frequently Asked Questions - 39500AU Union Special
How do I thread the Union Special 39500AU?
Follow the numbered path on the machine: from spool through tension discs, take-up lever, needle bar, and needle eye. Ensure the presser foot is raised during threading.
What type of needle should I use?
Use industrial needles of system 134 or 135×17, size depending on fabric weight (e.g., size 16-18 for denim).
How do I adjust the stitch length?
Turn the stitch length dial on the machine body. Higher numbers produce longer stitches. Typically ranges from 1 to 5 mm.
How often should I oil the machine?
Oil daily before use with high-quality sewing machine oil. Pay special attention to hook, feed dog, and needle bar areas.
The machine skips stitches. What should I do?
Check needle condition (replace if bent/dull), ensure correct needle/thread combination, and verify timing. If problem persists, consult a technician.
How do I change the bobbin?
Open the shuttle cover, remove old bobbin, insert new one with thread unwinding clockwise, and pull thread through the tension spring and slit.
What is the maximum fabric thickness it can sew?
This machine can handle multiple layers of heavy fabrics like denim up to about 6 mm total thickness with appropriate needle and thread.
Why is the thread tension uneven?
Check both upper and bobbin tensions. Upper tension is adjusted via the dial; bobbin tension via the screw on the bobbin case. Also ensure proper threading.
Where can I find spare parts?
Authorized Union Special dealers or online industrial sewing parts suppliers. Common parts include needles, bobbins, feed dogs, and presser feet.
How do I clean the machine?
Use a lint brush or compressed air to remove dust and lint from the feed dog, hook area, and bobbin case. Avoid oil buildup by wiping with a soft cloth.
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