30-7901 - Angle Grinder Cotech - Free user manual and instructions
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| Product type | Angle grinder |
| Brand | Cotech |
| Model | 30-7901 |
| Disc diameter | 125 mm |
| Rated power | 1100 W |
| No-load speed | 12000 RPM |
| Spindle thread | M14 |
| Power supply | 230 V AC, 50 Hz |
| Weight | 2.1 kg |
| Dimensions (L x W x H) | 310 x 120 x 130 mm |
| Main functions | Grinding, cutting, sanding |
| Safety features | Anti-restart protection, adjustable safety guard, side handle |
| Included accessories | Grinding disc, cutting disc, side handle, flange wrench |
| Vibration level | 7.5 m/s² |
| Sound pressure level | 85 dB(A) |
| Maintenance | Clean ventilation slots regularly, replace carbon brushes when worn |
| Reparability | Spare parts available; replaceable carbon brushes |
Frequently Asked Questions - 30-7901 Cotech
What is the maximum disc size for the Cotech 30-7901 angle grinder?
The Cotech 30-7901 accepts 125 mm discs, which are ideal for both grinding and cutting applications.
How do I change the grinding disc?
Disconnect the tool from power, press the spindle lock, use the flange wrench to loosen the flange nut, replace the disc, and re-tighten securely.
What safety equipment should I use?
Always wear safety goggles, ear protection and gloves. Keep the guard in place and use the side handle for two-handed control.
Can I cut metal with this angle grinder?
Yes, fit a suitable cutting disc and keep a firm grip. Use light pressure and let the tool reach full speed before starting the cut.
How do I adjust the safety guard?
Loosen the guard clamp, rotate the guard to the desired position, then tighten the clamp securely before starting work.
What maintenance does the grinder require?
Keep ventilation slots clean, regularly check the carbon brushes, and replace them when they are worn beyond 1/3 of their length.
Are carbon brushes replaceable?
Yes, the carbon brushes are replaceable. Unscrew the brush caps, remove old brushes, insert new ones and tighten the caps.
What is the no-load speed and why does it matter?
The no-load speed is 12000 RPM. It determines how fast the disc spins when not under load, which ensures clean and efficient grinding and cutting.
How should I hold the grinder during operation?
Use both hands: one on the side handle and one on the main handle. Keep the disc at a 15-30° angle for grinding and apply even pressure.
Can the grinder be used for sanding?
Yes, with a sanding attachment or flap disc, the grinder can be used for sanding wood, metal, or composite materials.
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USER MANUAL 30-7901 Cotech
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Product information
Brand : Cotech
Model : 30-7901
Category : Angle Grinder