
Mirka® PROS
150 mm (6″), 125 mm (5″)

Exploded view



Parts list – kits
| Mirka code | Item | Description | Kit | Quantity | Part No |
| MIE6536211 | Bearing kit (loose parts) | A | |||
| 316 | Bearing | 1 | MPP0316 | ||
| 317 | Rubber Seal | 1 | MPP0317 | ||
| 318 | Washer (Optional) | opt. | MPP0318 | ||
| 319 | Retaining Ring | 1 | MPP0319 | ||
| 8995690141 | Spindle Bearing kit (pre-assembled) | A+320 | |||
| 316 | Bearing | 1 | MPP0316 | ||
| 317 | Rubber Seal | 1 | MPP0317 | ||
| 318 | Washer (Optional) | opt. | MPP0318 | ||
| 319 | Retaining Ring | 1 | MPP0319 | ||
| 320 | Spindle | 1 | MPP0320 | ||
| 8995690021 | Endplate Bearing kit | B | MPP9002 | ||
| 301 | Retaining Ring | 1 | MPP0301 | ||
| 302 | Bearing | 1 | MPP0302 | ||
| 311 | Dust Seal | 1 | MPP0311 | ||
| 324 | Bearing | 1 | MPP0324 | ||
| 8995690031 | Speed Valve kit | C | MPP9003 | ||
| 201 | Regulator Unit | 1 | MPP0201 | ||
| 202 | Valve Stem | 1 | MPP0202 | ||
| 203 | O-Ring | 1 | MPP0203 | ||
| 204 | O-Ring | 2 | MPP0204 | ||
| 205 | Retaining Ring | 1 | MPP0205 | ||
| 8995690041 | Muffler kit 12000 rpm | D | MPP9004 | ||
| 404 | Nozzle | 1 | MPP0404 | ||
| 405 | Muffler | 1 | MPP0405 | ||
| 406 | Muffler CAP | 1 | MPP0406 | ||
| 422 | O-Ring | 1 | MPP0422 | ||
| 423 | Powder Metal Silencer | 1 | MPP0423 | ||
| 8995690051 | Air Inlet kit | E | MPP9005 | ||
| 206 | Seal | 1 | MPP0206 | ||
| 207 | Tip Valve | 1 | MPP0207 | ||
| 208 | Valve Spring | 1 | MPP0208 | ||
| 209 | Inlet Connection | 1 | MPP0209 | ||
| 8995690061 | Rotor, Vanes and Key kit | F | MPP9006 | ||
| 308 | Vanes | 5 | MPP0308 | ||
| 309 | Rotor | 1 | MPP0309 | ||
| 314 | Rotor Key | 1 | MPP0314 | ||
| 8995690071 | Exhaust and Swivel kit – PROS CV & DB | G | MPP9007 | ||
| 407 | Vacuum Adapter – PROS CV & DB | 1 | MPP0407 | ||
| 408 | O-Ring | 1 | MPP0408 | ||
| 409 | Swivel Grip | 1 | MPP0409 | ||
| 410 | Swivel Connector | 1 | MPP0410 | ||
| 8995690151 | Lever kit 2,5 mm Orbit | H | MPP9015 | ||
| 210 | Spring Pin | 1 | MPP0210 | ||
| 211 | Lever 2,5 mm Orbit | 1 | MPP0214 | ||
| 8995690081 | Lever kit 5,0 mm Orbit | H | MPP9008 | ||
| 210 | Spring Pin | 1 | MPP0210 | ||
| 211 | Lever 5,0 mm Orbit | 1 | MPP0211 | ||
| 8995690091 | Lever kit 8,0 mm Orbit | H | MPP9009 | ||
| 210 | Spring Pin | 1 | MPP0210 | ||
| 211 | Lever 8,0 mm Orbit | 1 | MPP0213 | ||
| 8995690221 | Retainer and O-Ring kit – PROS DB | I | MPP9022 | ||
| 411 | O-Ring | 2 | MPP0411 | ||
| 417 | Exhaust Plug | 1 | MPP0417 | ||
| 8995690121 | Housing and Mark Plate kit | J | MPP9012 | ||
| 101 | Housing | 1 | MPP0101 | ||
| 102 | Mark Plate | 1 | MPP0102 | ||
| 103 | Model Sticker (550, 580, 625, 650 & 680) | 7 | MPP0103 | ||
| 8995690111 | Lock Ring and O-Ring kit | K | MPP9011 | ||
| 312 | O-Ring | 1 | MPP0312 | ||
| 313 | Lock Ring | 1 | MPP0313 | ||
| 8995690131 | Cylinder, Spring Pin and O-Ring kit | L | MPP9013 | ||
| 304 | Spring Pin | 1 | MPP0304 | ||
| 306 | Cylinder | 1 | MPP0306 | ||
| 307 | O-Ring | 1 | MPP0307 | ||
| 8995690251 | Shaft Balancer kit 2,5mm/125 mm – PROS 525 | M | MPP9025 | ||
| 315 | Shaft Balancer 2,5 mm/ 100 g Pad | 1 | MPP0330 | ||
| 325 | Balance Screws | 2 | MPP0325 | ||
| 8995690161 | Shaft Balancer kit 5,0mm/125 mm – PROS 550 | M | MPP9016 | ||
| 315 | Shaft Balancer 5,0 mm/ 100 g Pad | 1 | MPP0315 | ||
| 325 | Balance Screws | 2 | MPP0325 | ||
| 8995690211 | Shaft Balancer kit 8,0mm/125 mm – PROS 580 | M | MPP9021 | ||
| 315 | Shaft Balancer 8,0 mm/ 100 g Pad | 1 | MPP0329 | ||
| 325 | Balance Screws | 2 | MPP0325 | ||
| 8995690171 | Shaft Balancer kit 2,5mm/150 mm – PROS 625 | M | MPP9017 | ||
| 315 | Shaft Balancer 2,5 mm/ 130 g Pad | 1 | MPP0326 | ||
| 325 | Balance Screws | 2 | MPP0325 | ||
| 8995690181 | Shaft Balancer kit 5,0mm/150 mm – PROS 650 | M | MPP9018 | ||
| 315 | Shaft Balancer 5,0 mm/ 130 g Pad | 1 | MPP0327 | ||
| 325 | Balance Screws | 2 | MPP0325 | ||
| 8995690191 | Shaft Balancer kit 8,0mm/150 mm – PROS 680 | M | MPP9019 | ||
| 315 | Shaft Balancer 8,0 mm/ 130 g Pad | 1 | MPP0328 | ||
| 325 | Balance Screws | 2 | MPP0325 | ||
| 8995690201 | Muffler Connection and O-Ring kit – PROS CV | N | MPP9020 | ||
| 402 | Muffler Connection | 1 | MPP0402 | ||
| 411 | O-Ring | 2 | MPP0411 | ||
| 8995690231 | Hose Assembly kit 1.8 m – PROS DB | O | MPP9023 | ||
| 414 | Hose Air Tube | 1 | MPP0414 | ||
| 418 | Fastening Straps | 5 | MPP0418 | ||
| 419 | Hose 1.8 m for DB | 1 | MPP0419 | ||
| 8995690241 | Muffler Connection kit – PROS NV | P | MPP9024 | ||
| 421 | Muffler Connection | 1 | MPP0421 | ||
NOTE! Repairs done by non-authorized repairer will breach the Mirka warranty.
Electrical tools must be serviced by a qualified repair person and in accordance with national requirements.
Parts list – spareparts & accessories
| Mirka code | Item | Description | Kit | Quantity | MPP0101 |
| 101 | Housing | J | 1 | Part No | |
| 102 | Mark Plate | J | 1 | MPP0102 | |
| 103 | Model Sticker (550, 580, 625, 650 & 680) | J | 7 | MPP0103 | |
| 201 | Regulator Unit | C | 1 | MPP0201 | |
| 202 | Valve Stem | C | 1 | MPP0202 | |
| 203 | O-Ring | C | 1 | MPP0203 | |
| 204 | O-Ring | C | 2 | MPP0204 | |
| 205 | Retaining Ring | C | 1 | MPP0205 | |
| 206 | Seal | E | 1 | MPP0206 | |
| 207 | Tip Valve | E | 1 | MPP0207 | |
| 208 | Valve Spring | E | 1 | MPP0208 | |
| 209 | Inlet Connection | E | 1 | MPP0209 | |
| 210 | Spring Pin | H | 1 | MPP0210 | |
| 211 | Lever 5,0 mm Orbit | H | 1 | MPP0211 | |
| 211 | Lever 8,0 mm Orbit | H | 1 | MPP0213 | |
| 211 | Lever 2,5 mm Orbit | H | 1 | MPP0214 | |
| 8995602121 | 212 | Cover | 1 | MPP0212 | |
| 301 | Retaining Ring | B | 1 | MPP0301 | |
| 302 | Bearing | B | 1 | MPP0302 | |
| 8995603031 | 303 | Front Ring | 1 | MPP0303 | |
| 304 | Spring Pin | L | 1 | MPP0304 | |
| 8995603051 | 305 | Front Bearing Plate | 1 | MPP0305 | |
| 306 | Cylinder | L | 1 | MPP0306 | |
| 8995603071 | 307 | O-Ring 10/pack | L | 1 | MPP0307 |
| 308 | Vanes | F | 5 | MPP0308 | |
| 309 | Rotor | F | 1 | MPP0309 | |
| 8995603101 | 310 | Rear End Plate | 1 | MPP0310 | |
| 311 | Dust Seal | B | 1 | MPP0311 | |
| 312 | O-Ring | K | 1 | MPP0312 | |
| 313 | Lock Ring | K | 1 | MPP0313 | |
| 314 | Rotor Key | F | 1 | MPP0314 | |
| 315 | Shaft Balancer 2,5 mm/ 100 g Pad | M | 1 | MPP0330 | |
| 315 | Shaft Balancer 5,0 mm/ 100 g Pad | M | 1 | MPP0315 | |
| 315 | Shaft Balancer 8,0 mm/ 100 g Pad | M | 1 | MPP0329 | |
| 315 | Shaft Balancer 2,5 mm/ 130 g Pad | M | 1 | MPP0326 | |
| 315 | Shaft Balancer 5,0 mm/ 130 g Pad | M | 1 | MPP0327 | |
| 315 | Shaft Balancer 8,0 mm/ 130 g Pad | M | 1 | MPP0328 | |
| 316 | Bearing | A | 1 | MPP0316 | |
| 317 | Rubber Seal | A | 1 | MPP0317 | |
| 318 | Washer (Optional) | A | opt. | MPP0318 | |
| 319 | Retaining Ring | A | 1 | MPP0319 | |
| 8995603201 | 320 | Spindle | A+320 | 1 | MPP0320 |
| 8995603211 | 321 | Brake Seal | 1 | MPP0321 | |
| 8292502011 | 323 | Mirka Backing Pad 125 mm, 28 H 5/16” Grip Med.100g | 1 | – | |
| 8292605011 | 323 | Mirka Backing Pad 150 mm, 48 H 5/16” Grip Med. 130g | 1 | – | |
| 8292501011 | 323 | Mirka Backing Pad 125 mm, NH 5/16″ PSA M 100g | 1 | – | |
| 8292601011 | 323 | Mirka Backing Pad 150 mm, NH 5/16″ PSA M 130g | 1 | – | |
| 324 | Bearing | B | 1 | MPP0324 | |
| 325 | Balance Screws | M | 2 | MPP0325 | |
| 8995604011 | 401 | Connector – PROS CV | 1 | MPP0401 | |
| 402 | Muffler Connection | N | 1 | MPP0402 | |
| 404 | Nozzle | D | 1 | MPP0404 | |
| 405 | Muffler | D | 1 | MPP0405 | |
| 406 | Muffler CAP | D | 1 | MPP0406 | |
| 407 | Vacuum Adapter | G | 1 | MPP0407 | |
| 408 | O-Ring | G | 1 | MPP0408 | |
| 409 | Swivel Grip | G | 1 | MPP0409 | |
| 410 | Swivel Connector | G | 1 | MPP0410 | |
| 411 | O-Ring | I,N | 2 | MPP0411 | |
| 8995604121 | 412 | Mirka Pad Wrench 24mm (supplied with each tool) | 1 | MPP0412 | |
| 8995604131 | 413 | Eductor Tube – PROS DB | 1 | MPP0413 | |
| 414 | Hose Air Tube | O | 1 | MPP0414 | |
| 8995604151 | 415 | Dust Bag | 1 | MPP0415 | |
| 8995604161 | 416 | Connector – PROS DB | 1 | MPP0416 | |
| 417 | Exhaust Plug | I | 1 | MPP0417 | |
| MIN6529211 | 418 | Fastening Straps 6/pack | O | 5 | MPP0418 |
| 419 | Hose Assembly 1.8 m – PROS DB | O | 1 | MPP0419 | |
| 8995604201 | 420 | Vacuum Adapter – PROS NV | 1 | MPP0420 | |
| 421 | Muffler Connection | P | 1 | MPP0421 | |
| 422 | O-Ring | D | 1 | MPP0422 | |
| 423 | Powder Metal Silencer | D | 1 | MPP0423 | |
- Spare parts only available to authorized repairers.
| Pad Medium* | Mirka code | 525NV | 550CV/NV | 580CV/NV | 625CV/NV | 650CV/NV | 680CV/NV |
| 125 mm (5″), 100 g Grip | 8292502011 | X | X | X | |||
| 150 mm (6″), 130 g Grip | 8292605011 | X | X | X | |||
| 125 mm (5″), 100 g PSA | 8292501011 | X | X | X | |||
| 150 mm (6″), 130 g PSA | 8292601011 | X | X | X |
* Soft and hard pad variants available as accessories.
Declaration of conformity
| Mirka Ltd, 66850 Jeppo, Finland declare under our sole responsibility that the Mirka® products (listed below and see “Technical data” table for particular model) to which this declaration relates are in conformity with the following standards or other normative documents: EN ISO 12100:2010, EN ISO 111488:2011, EN ISO 15744:2008 & EN ISO 28927-3:2009. In accordance with the directive 2006/42/EC. | ||||
| Products: Mirka ® PROS 150 mm (6″), 125 mm (5″) | ||||
| Jeppo 12.08.21 Place and date of issue | Company | ![]() Stefan Sjöberg, CEO | Manufacturer / Supplier Mirka Ltd 66850 Jeppo, Finland Tel. +358 20 760 2111 Fax +358 20 760 2290 www.mirka.com | |
Original instructions. We reserve the right to make changes to this manual without prior notice.
Important
Read these safety and operating instructions carefully before installing, operating, or maintaining this tool. Keep these instructions in a safe and accessible place. Read and comply with state and local regulations.
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Symbols
| Complies with EU relevant standards | |
| Complies with Eurasian conformity requirements | |
| Complies with Serbian conformity requirements | |
| Complies with UK relevant regulations |
Warning: Potential hazardous situation that may result in death or serious injury and/or property damage.
Caution: Potential hazardous situation that may result in minor or moderate injury and/or property damage.
Please read and comply with
- General Industry Safety & Health Regulations, part 1910, OSHA 2206, available from: Superintendent of Documents;
Government Printing Office; Washington DC 20402 - Safety Code for Portable Air Tools, ANSI B186.1 available from American National Standards Institute, Inc.; 1430 Broadway; New York, New York 10018
- State and local regulations
WARNING
- Always wear required personal safety protection in accordance with manufacturer’s instructions and local/national standards while using this tool.
- Do not use a power tool if you are tired or under the influence of drugs, alcohol or medication.
- Read the Materials Safety Data Sheet (MSDS) for the working surface.
- Use the tool with dust extraction. A suitable dust extraction unit will reduce hazardous dust.
- Do not overreach. Keep proper footing and balance at all times.
- Do not wear loose clothing or jewellery. Keep your hair, clothing and gloves away from moving parts.
- Loose clothes, jewellery or long hair can be caught in moving parts.
- If any physical hand/wrist discomfort is experienced, stop working and seek medical attention.
- Hand, wrist and arm injury may result from repetitive work, motion and overexposure to vibrations.
- Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases or dust.
- The tool is not electrically insulated. Check work area for live electricity, gas pipes, etc. before operation.
CAUTION
- Prevent unintentional starting.
- Remove pad wrench before connecting the tool to the air supply.
- Keep work area clean and well lit.
- Always ensure that the work piece to be sanded is firmly fixed.
- Before changing abrasive always disconnect the air supply.
Additional Safety Warnings
- Read all instructions before using this tool. All operators must be fully trained in usage and safety of this tool.
- All maintenance must be carried out by trained personnel. For service, contact Mirka authorized service centre!
- Always wear required safety equipment (see warnings).
- The operator must be in a secure position and have a firm grip and footing on a solid floor.
- Always ensure that the workpiece to be sanded is firmly fixed.
- Check tool, backing pad, hose and fittings regularly for wear.
- Always take care to ensure your safety at work; never carry, store or leave the tool unattended with the air supply connected.
- Vacuum unit dust collection bag should be cleaned or replaced daily. Dust can be highly combustible. Cleaning or replacing of bag also assures optimum performance.
- Do not exceed maximum recommended air pressure of 6.2 bar (90 psig).
- Take care to avoid entanglement of the moving parts of the tool with clothing, ties, hair, cleaning rags, etc.
- Keep hands clear of the spinning pad during use.
- If the tool appears to malfunction, remove from use immediately and arrange for service and repair.
- Before changing abrasive always disconnect the air supply. Take care to properly attach and centre the abrasive on the backing pad.
Technical data
| PROS | 525NV | 550CV/NV | 580CV/NV | 625CV/NV | 650CV/NV | 680CV/NV |
| Orbit | 2.5 mm (3/32″) | 5 mm (3/16″) | 8 mm (5/16″) | 2.5 mm (3/32″) | 5 mm (3/16″) | 8 mm (5/16″) |
| Vacuum type | ||||||
| Pad size | Ø 125 mm (5″) | Ø 125 mm (5″) | Ø 125 mm (5″) | Ø 150 mm (6″) | Ø 150 mm (6″) | Ø 150 mm (6″) |
| Product net weight | 0.89 kg (2.0 lbs) | 0.89 kg (2.0 lbs) | 0.91 kg (2.0 lbs) | 0.9 kg (2.0 lbs) | 0.93 kg (2.1 lbs) | 0.95 kg (2.1 lbs) |
| Height | 102 mm (4″) | 102 mm (4″) | 102 mm (4″) | 102 mm (4″) | 102 mm (4″) | 102 mm (4″) |
| Length | 229 mm (9,02″) | 229 mm (9,02″) | 229 mm (9,02″) | 229 mm (9,02″) | 229 mm (9,02″) | 229 mm (9,02″) |
| Speed | 12,000 rpm | 12,000 rpm | 12,000 rpm | 12,000 rpm | 12,000 rpm | 12,000 rpm |
| Noise level | CV: | CV:76 dB(A) | CV:78 dB(A) | CV:75 dB(A) | CV:76 dB(A) | CV:77 dB(A) |
| Noise level | NV:75 dB(A) | NV:75 dB(A) | NV:77 dB(A) | NV:75 dB(A) | NV:76 dB(A) | NV:74 dB(A) |
| Power | 270 W | 270 W | 270 W | 270 W | 270 W | 270 W |
| Air consumption | 485 lpm | 485 lpm | 485 lpm | 485 lpm | 485 lpm | 485 lpm |
| Vibration level * | 2.8 m/s2 | 2.4 m/s2 | 3.8 m/s2 | 2.3 m/s2 | 3.2 m/s2 | 3.4 m/s2 |
| 0.8 Vibration emission uncertainty K * | 0.8 m/s2 | 0.8 m/s2 | 0.9 m/s2 | 0.7 m/s2 | 0.8 m/s2 | 0.8 m/s2 |
| PROS | 550DB | 580DB | 625DB 650DB | 680DB | |
| Orbit | 5 mm (3/16″) | 8 mm (5/16″) | 2.5 mm (3/32″) | 5 mm (3/16″) | 8 mm (5/16″) |
| Vacuum type | Self-generated | Self-generated | Self-generated | Self-generated | Self-generated |
| Pad size | 0 125 mm (5″) | 0 125 mm (5″) | 0 150 mm (6″) | 0 150 mm (6″) | 0 150 mm (6″) |
| Product net weight | 0.89 kg (2.0 Ibs) | 0.91 kg (2.0 Ibs) | 0.9 kg (2.0 Ibs) | 0.93 kg (2.1 Ibs) | 0.95 kg (2.1 Ibs) |
| Height | 102 mm (4″) | 102 mm (4″) | 102 mm (4″) | 102 mm (4″) | 102 mm (4″) |
| Length | 229 mm (9,02″) | 229 mm (9,02″) | 229 mm (9,02″) | 229 mm (9,02″) | 229 mm (9,02″) |
| Speed | 12,000 rpm | 12,000 rpm | 12,000 rpm | 12,000 rpm | 12,000 rpm |
| Noise Level | 81.3 dB(A) | 80.9 dB(A) | 80.3 dB(A) | 78.2 dB(A) | 79.7 dB(A) |
| Power | 200 W | 200 W | 200 W | 200 W | 200 W |
| Air consumption | 14851pm | 485Ipm | 485 Ipm | 485Ipm | 14851pm |
| Vibration level * | 2.8 m/s2 | 3.5 m/s2 | 2.3 m/s2 | 3.0 m/s2 | 2.5 m/s2 |
| Vibration emission uncertainty K * | 0.8 m/s2 | 0.8 m/s2 | 0.7 m/s2 | 0.8 m/s2 | 0.7 m/s2 |
The noise test is carried out in accordance with EN ISO 15744:2008 – Hand-held non-electric power tools – Noise measurement code – Engineering method (grade 2).
The vibration test is carried out in accordance with ISO 28927-3 – Hand-held portable power tools – Test method for evaluation of vibration emission – Part 3: Polishers and rotary, orbital and random orbital sanders.
Specifications subject to change without prior notice. Model range may vary between markets.
* The values stated in the table are derived from laboratory testing in conformity with stated codes and standards and are not sufficient for risk evaluation. Values measured in a particular workplace may be higher than the declared values. The actual exposure values and amount of risk or harm experienced by an individual are unique to each situation and depend upon the surrounding environment, the way the individual operates the machinery, the particular material being worked, work station design, and the user’s exposure time and physical condition. Mirka Ltd accepts no responsibility for the consequences of using declared values instead of actual exposure values for any individual risk assessment.
* Without dust bag and dust hose.
Further occupational health and safety information can be obtained from the following websites:
https://osha.europa.eu/en (Europe) or http://www.osha.gov (USA)
Proper use of tool
This sander is designed for sanding all types of materials i.e. metals, wood, stone, plastics, etc. using abrasive designed for this purpose. Do not use this sander for any other purpose than specified, without consulting your Mirka dealer. Only use Mirka backing pads that are designed for optimal performance with the brake seal. Never mount a backing pad without a spacing washer. Other backing pads may reduce performance and will increase vibrations.
Work stations
The tool is intended to be operated as a hand-held tool. It is always recommended that the tool should be used when standing on a solid floor. It can be in any position but before any such use, the operator must be in a secure position, having a firm grip and footing and be aware that the sander can develop a torque reaction. See the section “Operating instructions”.
Operating instructions
When unpacking the tool, make sure it is intact, complete, and has not been damaged in transport. Never use a damaged tool.
To attach air supply, lift up the cover and connect air supply, close the cover before operating the tool. Use a clean lubricated air supply that will give a measured air pressure at the tool of 6.2 bar (90 psig) when the tool is running with the lever fully pressed. It is recommended to use an approved 10 mm (3/8″) x 8 m (25 ft) maximum-length air hose. The tool should be connected to the air supply as shown in Figure 1.
Do not connect the tool to the compressed air system without incorporating an easy-to-reach and operate air shutoff valve. It is strongly recommended that an air filter, regulator and lubricator (FRL) are used as shown in Figure 1 as this will supply clean, lubricated air at the correct pressure to the tool. Details of such equipment can be obtained from your supplier. If such equipment is not used the tool should be manually lubricated.
To manually lubricate the tool, disconnect the air hose and put 2 to 3 drops of supplied oil or Wurth art. no. 08930505 into the air connection on the tool. Reconnect the tool to the air supply and run the tool slowly for a few seconds to allow air to circulate the oil. If the tool is used frequently, lubricate it on a daily basis.
Lubricate the tool before longer storage or if the tool slows down or loses power.
It is recommended that the air pressure at the tool is 6.2 bar (90 psig) while the tool is running. The tool can run at lower pressures but never higher than 6.2 bar (90 psig).

Maintenance
Always disconnect the air supply before maintenance!
Only use original Mirka spare parts!
Replacing the backing pad
- Insert the pad wrench between the backing pad and brake seal to hold the spindle nut.
- Turn the backing pad counterclockwise to remove it.
- Fit and tighten the new backing pad with washers.
- Remove the pad wrench.
Pad saver
Mirka’s pad savers are designed to protect the backing pad from wear and tear, when sanding aggressively and continuously with net products. These cost effective pad savers, placed between the backing pad and the sanding disc, should be changed regularly. The pad savers prolong the life of the backing pad.

https://www.mirka.com/accessories/pad-savers/
Replacing the brake seal
NOTE! Too much vacuum in your dust extraction system may cause the brake seal to malfunction.
- Remove the backing pad as described above.
- Pull the old brake seal out of its groove.
- Fit the new brake seal in the groove.
- Fit the backing pad as described above.
- Check the brake seal function. By changing the number of washers between the spindle and backing pad, the effect of the brake seal can be adjusted.
Replacing the muffler kit
PROS NV/CV
- Lift up the cover.
- Remove the muffler cup by pushing it firmly to the side and insert a screwdriver between the cup and the hex nut, twist the screwdriver to release the cup from the housing.
- Reattach new muffler to the housing.
Further service
Servicing must always be performed by trained personnel. To keep the tool warranty valid and ensure optimal tool safety and function, servicing must be carried out by a Mirka authorized service centre. To locate your local Mirka authorized service centre, contact Mirka Customer Service or your Mirka dealer.
Troubleshooting guide
| Symptom | Possible cause | Solution |
| Low power and/ or low free speed. | Speed control set to low speed. | Turn the speed control to desired speed. |
| Low air pressure. | Check air supply (according to operating instructions). | |
| Exhaust plug not aligned (DB model). | Check that one of the four marks on the exhaust plug is aligned with the single mark below the exhaust plug. | |
| Clogged muffler. | Clean or replace the muffler. | |
| Plugged air inlet screen. | Clean or replace the screen. | |
| Internal air leakage in the motor housing. | Check motor assembly and alignment. Check air inlet 0-ring alignment on motor assembly. | |
| Worn or broken vanes. | Install a complete set of new vanes and rotor (Kit F). | |
| Housing cracked or damaged. | Contact Mirka authorized service centre. | |
| Worn or broken spindle bearing. | Replace the worn or broken bearing (Kit A). | |
| Air leakage at the speed control. | Dirty, broken or bent valve spring, valve or valve seat. Incorrect assembly of air valve. | Disassemble, inspect and replace worn or damaged parts. Remove air inlet connection and reassemble the air valve (207), with the valve stem (202) in its upper position. |
| Vibration / rough operation. | Incorrect backing pad. | Only use Mirka backing pad 125 mm (5″), 150 mm (6″). |
| Addition of interface or other material. | Only use abrasive and/or interface designed for the machine. | |
| Damaged backing pad. | Replace the pad. Only use Mirka backing pad 125 mm (5″), 150 mm (6″). | |
| Worn or broken motor bearing(s). | Replace the worn or broken bearings. | |
| Too much vacuum on a flat surface can increase vibrations. | Lower the vacuum of your dust extraction unit. | |
| Low motor speed. | Increase motor speed with flow regulator. max 6.2 bar. |
Declaration of conformity
Mirka Ltd, 66850 Jeppo, Finland
declare under our sole responsibility that the Mirka® products (listed below and see “Technical data” table for particular model) to which this declaration relates are in conformity with the following standards or other normative documents: BS EN ISO 12100:2010, BS EN ISO 11148-8:2011, BS EN ISO 15744:2008 & BS EN ISO 28927-3:2009.. In accordance with the Supply of Machinery (Safety) Regulations 2008.
Products: Mirka ® PROS 150 mm (6″), 125 mm (5″)
| Jeppo 12.08.21 Place and date of issue | ![]() Stefan Sjöberg, CEO | |
| Manufacturer / Supplier Mirka Ltd 66850 Jeppo, Finland Tel. +358 20 760 2111 Fax +358 20 760 2290 www.mirka.com | Importer Information Mirka (UK) Ltd Saxon House Shirwell Crescent Furzton Lake Milton Keynes MK4 1GA Tel. +44 (0)1908 866100 |
This chapter is an addition to the English language chapter of the manual in order to fulfill the UKCA regulation requirements. Please refer to the English language chapter for more information about your product.


Mirka USA Inc.
For contact information, please visit www.mirka.com
Dedicated to the finish
©Mirkaltd08-2021




















