AZF8520G-31 - Sewing machine Yamato - Free user manual and instructions
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| Product Type | Industrial Overlock Sewing Machine |
| Brand | Yamato |
| Model | AZF8520G-31 |
| Stitch Type | Safety Stitch (e.g. 518, 504, 401) |
| Number of Needles | 2 or 3 (depending on configuration) |
| Number of Threads | 4 or 5 |
| Max Sewing Speed | Up to 6,500 stitches per minute |
| Stitch Length | 1.0 - 4.5 mm |
| Differential Feed Ratio | 0.7 - 2.0 |
| Power Supply | Single-phase 220V, 50/60 Hz (or 110V) |
| Motor Power | 400 - 550 W (integrated servo motor) |
| Dimensions (approx.) | 500 x 300 x 450 mm (L x W x H) |
| Weight (approx.) | 35 kg |
| Lubrication | Automatic oil feed system |
| Needle Thread Tension | Adjustable via dials |
| Presser Foot Pressure | Adjustable |
| Cutting Device | Upper and lower knife (adjustable) |
| Thread Trimmer | Automatic thread trimmer (optional) |
| Safety Features | Needle guard, emergency stop, safety clutch |
| Maintenance | Regular cleaning of lint, oil wicks replacement |
| Accessories Included | Tool kit, oil bottle, screwdrivers, spare needles |
Frequently Asked Questions - AZF8520G-31 Yamato
How do I thread the Yamato AZF8520G-31 machine?
Refer to the threading diagram on the machine. Typically, for a 4-thread overlock, pass threads through tension discs, take-up lever, and lower looper. Use the thread path markers for guidance.
What oil should I use for lubrication?
Use sewing machine oil specifically designed for industrial machines (e.g., ISO VG 32). Avoid substitutes like engine oil. Fill the oil reservoir and change wicks periodically.
How to adjust stitch length?
Locate the stitch length dial (usually with numbers 1-4). Turn to desired length; typical range is 1.0 to 4.5 mm. Test on scrap fabric.
Why is the fabric not feeding properly?
Check differential feed ratio. For stretch fabrics, increase ratio >1.0; for stable fabrics, set to 1.0. Also ensure presser foot pressure is correct and feed dogs are not worn.
How to clean and maintain the machine?
Turn off and unplug. Use a soft brush and compressed air to remove lint from feed dogs, hook area, and under the needle plate. Oil as per manual schedule.
What needles are compatible?
Standard industrial needles: DBx1 or DPx5 (size 90/14 to 110/18). Use needle size appropriate for fabric weight.
My machine is skipping stitches. What to do?
Check needle condition (bent/blunt), correct needle type, and timing. Also verify tension settings and that the needle is fully inserted.
How to adjust the knife for cutting width?
The upper and lower knives can be adjusted. Loosen the screw, set the lower knife position, and adjust the upper knife to trim allowance (e.g., 3-6 mm). Tighten securely.
What is the maximum sewing speed?
The Yamato AZF8520G-31 can sew up to 6,500 stitches per minute under optimal conditions. Reduce speed for heavy or delicate fabrics.
How to replace the oil wick?
Remove old wick from oil wick pipe. Insert new wick (e.g., #303) ensuring it reaches the oil sump. Trim to appropriate length. This ensures consistent lubrication to the hook.
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