Mirka DEROS II in Detail – Practical Knowledge for Professionals Who Want Performance and Longevity
The Mirka DEROS II is one of the most powerful random orbital sanders in its class. Whether 125 mm, 150 mm, or 175 mm – it impresses with its smooth running, precision, and maintenance-friendly design. In this practical guide, you will learn how to get the maximum out of your machine, which spare parts are relevant, and which torque values apply for assembly.
Product Overview
| Variant | Pad-Ø | Orbit | Motor Power |
|---|---|---|---|
| DEROS II 5650 | 125 / 150 mm | 5.0 mm | 350 W |
| DEROS II 750 | 175 mm | 5.0 mm | 350 W |
Torque
up to 25 Nm
Voltage
220–240 V
Sanding Pad
Net 125–175 mm (28–48 holes)
Recommended Basic Settings (Reference Values)
- Pad Torque: approx. 25 Nm
- Screws (2.5 × 10 mm): 0.6 Nm
- Housing Screws (3 × 25 mm): 1.4 Nm
- Mains Voltage: 220–240 V
- Recommended Pad Weights: 100 g – 165 g
Professional Workflow: How to Use the DEROS II Efficiently
- Place the machine on a firm, clean surface and check the mains voltage.
- Mount the sanding pad according to the desired diameter (125, 150, or 175 mm).
- Set the speed controller to the medium level – optimal for uniform removal.
- Apply light pressure to the workpiece when starting – the machine works with low vibration.
- After finishing work, blow off the machine and check the pad for damage.
- Regularly inspect the Bearing Dual Seal Kits (Item MIE6536211 / MIE7536011).
Troubleshooting
1. Uneven Running:
– Check the pad for a tight fit
– Check bearings for wear
2. No Power:
– Check the start button (Kit MIE6520211) for contact
– Replace the mains cable (MIE9016011 ff.)
3. Strong Vibration:
– Check the spindle and dual bearing
– Replace the brake seal (Brake Seal 8995603211)
4. No Dust Extraction:
– Clean the Swivel Exhaust (MIE6521011)
– Check the hose connection
Maintenance – Checklist
- Regularly check and, if necessary, renew the bearing grease
- Replace the seal kit (Dual Seal Washer) every six months
- Check the power cable for kinks
- Regularly clean the housing to avoid dust buildup
- Only use original parts according to the exploded view
FAQ
- Can I use the 125 mm pad on the 150 mm version?
Only if the Balancing Kit (8995690101) is mounted. - How do I recognize defective bearings?
Distinct rattling or an increased vibration level are typical signs. - How often should I change the seals?
Every 6 months or after approx. 500 operating hours. - What should I do if the housing overheats?
Clean the motor fan and check the speed. - Where can I get original parts?
From beschicht.com – authorized Mirka dealer.
Conclusion: The Mirka DEROS II is a professional sander that perfectly combines precision, efficiency, and longevity. Those who regularly work on surfaces benefit not only from the high performance but also from the simple maintenance and clearly structured spare parts lists.
