MIRKA PROS 525NV User manual

Mirka® PROS
150 mm (6") • 125 mm (5")

ar ................................8
bg Инструкция за експлоатация .............15
cs Návod k obsluze......................................22
da Brugsanvisning .......................................29
de Bedienungsanleitung ............................36
el Οδηγίες χρήσης ......................................43
en Operating instructions (original)..........50
es Instrucciones de manejo .......................57
et Kasutusjuhised........................................64
fiKäyttöohjeet............................................71
fr Instructions d’utilisation........................78
hr Upute za rad ............................................85
hu Kezelői útmutató ....................................92
it Istruzioni per l’uso ..................................99
ja 取扱説明書 ...........................................106
ko 사용 지침................................................113
lt Naudojimo instrukcijos........................120
lv Lietošanas instrukcija...........................127
mk Упатства за ракување.........................134
nl Gebruiksaanwijzing..............................141
no Bruksanvisning......................................148
pl Instrukcje dot. użytkowania................155
pt Instruções de operação .......................162
ro Instrucţiuni de operare ........................169
ru Руководство по эксплуатации .........176
sl Navodila za uporabo. . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
sr Uputstvo za rad.....................................190
sv Bruksanvisning......................................197
tr İşletim Talimatları .................................204
zh 操作说明................................................211
Mirka® PROS
150 mm (6") • 125 mm (5")

Mirka® PROS • 150 mm (6") • 125 mm (5") 3
Exploded view
PROS DB
PROS CV
PROS NV

4Mirka® PROS • 150 mm (6") • 125 mm (5")
Mirka code Item Description Kit Part No Quantity
MIE6536211 Bearing kit (loose parts) A
316 Bearing MPP0316 1
317 Rubber seal MPP0317 1
318 Washer (optional) MPP0318 opt.
319 Retaining ring MPP0319 1
8995690141 Spindle bearing kit (preassembled) A+320
316 Bearing MPP0316 1
317 Rubber seal MPP0317 1
318 Washer (optional) MPP0318 opt.
319 Retaining ring MPP0319 1
320 Spindle MPP0320 1
8995690021 Endplate bearing kit BMPP9002
301 Retaining ring MPP0301 1
302 Bearing MPP0302 1
311 Dust seal MPP0311 1
324 Bearing MPP0324 1
8995690031 Speed valve kit C MPP9003
201 Regulator unit MPP0201 1
202 Valve stem MPP0202 1
203 O-ring MPP0203 1
204 O-ring MPP0204 2
205 Retaining ring MPP0205 1
8995690041 Muffler kit 12000 rpm D MPP9004
404 Nozzle MPP0404 1
405 Muffler MPP0405 1
406 Muffler cap MPP0406 1
422 O-Ring MPP0422 1
423 Powder metal silencer MPP0423 1
8995690051 Air inlet kit EMPP9005
206 Seal MPP0206 1
207 Tip valve MPP0207 1
208 Valve spring MPP0208 1
209 Inlet connection MPP0209 1
8995690061 Rotor, vanes and key kit FMPP9006
308 Vanes MPP0308 5
309 Rotor MPP0309 1
314 Rotor key MPP0314 1
8995690071 Exhaust and swivel kit – PROS CV & DB G MPP9007
407 Vacuum adapter – PROS CV & DB MPP0407 1
408 O-ring MPP0408 1
409 Swivel grip MPP0409 1
410 Swivel connector MPP0410 1
8995690151 Lever kit 2,5 mm orbit H MPP9015
210 Spring pin MPP0210 1
211 Lever 2,5 mm orbit MPP0214 1
8995690081 Lever kit 5,0 mm orbit H MPP9008
210 Spring pin MPP0210 1
211 Lever 5,0 mm orbit MPP0211 1
Parts list – kits

4Mirka® PROS • 150 mm (6") • 125 mm (5") Mirka® PROS • 150 mm (6") • 125 mm (5") 5
Mirka code Item Description Kit Part No Quantity
8995690091 Lever kit 8,0 mm orbit H MPP9009
210 Spring pin MPP0210 1
211 Lever 8,0 mm orbit MPP0213 1
8995690221 Retainer and O-ring kit – PROS DB I MPP9022
411 O-ring MPP0411 2
417 Muffler connection MPP0417 1
8995690121 Housing and mark plate kit JMPP9012
101 Housing MPP0101 1
102 Mark plate MPP0102 1
103 Model sticker (PROS 550, 580, 625, 650 & 680) MPP0103 7
8995690111 Lock ring and O-ring kit KMPP9011
312 O-ring MPP0312 1
313 Lock ring MPP0313 1
8995690131 Cylinder, spring pin and O-ring kit LMPP9013
304 Spring pin MPP0304 1
306 Cylinder MPP0306 1
307 O-ring MPP0307 1
8995690251 Shaft balancer kit 2,5 mm / 125 mm – PROS 525 M MPP9025
315 Shaft balancer 2,5 mm/ 100 g pad MPP0330 1
325 Balance screws MPP0325 2
8995690161 Shaft Balancer kit 5,0 mm /125 mm – PROS 550 M MPP9016
315 Shaft balancer 5,0 mm /100 g pad MPP0315 1
325 Balance screws MPP0325 2
8995690211 Shaft balancer kit 8,0 mm / 125 mm – PROS 580 M MPP9021
315 Shaft balancer 8,0 mm/ 100 g pad MPP0329 1
325 Balance screws MPP0325 2
8995690171 Shaft balancer kit 2,5 mm /150 mm – PROS 625 M MPP9017
315 Shaft balancer 2,5 mm/ 130 g pad MPP0326 1
325 Balance screws MPP0325 2
8995690181 Shaft balancer kit 5,0 mm / 150 mm – PROS 650 M MPP9018
315 Shaft balancer 5,0 mm /130 g pad MPP0327 1
325 Balance screws MPP0325 2
8995690191 Shaft balancer kit 8,0 mm/ 150 mm – PROS 680 M MPP9019
315 Shaft balancer 8,0 mm/ 130 g pad MPP0328 1
325 Balance screws MPP0325 2
8995690201 Muffler connection and O-ring kit – PROS CV NMPP9020
402 Muffler connection MPP0402 1
411 O-ring MPP0411 2
8995690231 Hose assembly kit 1,8 m – PROS DB O MPP9023
414 Hose air tube MPP0414 1
418 Fastening straps MPP0418 5
419 Hose 1,8 m for PROS DB MPP0419 1
8995690241 Muffler connection kit – PROS NV PMPP9024
421 Muffler connection MPP0421 1
Separate parts on next page.
NOTE! Repairs done by non-authorized repairer will breach the Mirka warranty.
Power tool must be serviced by a qualified repair person and in accordance with national requirements.

6Mirka® PROS • 150 mm (6") • 125 mm (5")
Mirka code Item Description Kit Part No Quantity
101 Housing JMPP0101 1
102 Mark plate JMPP0102 1
103 Model Sticker (PROS 550, 580, 625, 650 & 680) JMPP0103 7
201 Regulator unit CMPP0201 1
202 Valve stem CMPP0202 1
203 O-ring CMPP0203 1
204 O-ring CMPP0204 2
205 Retaining ring CMPP0205 1
206 Seal EMPP0206 1
207 Tip valve EMPP0207 1
208 Valve spring EMPP0208 1
209 Inlet connection EMPP0209 1
210 Spring pin HMPP0210 1
211 Lever 5,0 mm orbit HMPP0211 1
211 Lever 8,0 mm orbit HMPP0213 1
211 Lever 2,5 mm orbit HMPP0214 1
8995602121 212 Cover MPP0212 1
301 Retaining ring BMPP0301 1
302 Bearing BMPP0302 1
8995603031 303 Front ring MPP0303 1
304 Spring pin LMPP0304 1
8995603051 305 Front bearing plate MPP0305 1
306 Cylinder LMPP0306 1
8995603071 307 O-ring 10/pack LMPP0307 1
308 Vanes FMPP0308 5
309 Rotor FMPP0309 1
8995603101 310 Rear end plate MPP0310 1
311 Dust seal BMPP0311 1
312 O-ring KMPP0312 1
313 Lock ring KMPP0313 1
314 Rotor key FMPP0314 1
315 Shaft balancer 2,5 mm/ 100 g pad MMPP0330 1
315 Shaft balancer 5,0 mm /100 g pad MMPP0315 1
315 Shaft balancer 8,0 mm/ 100 g pad MMPP0329 1
315 Shaft balancer 2,5 mm/ 130 g Pad MMPP0326 1
315 Shaft balancer 5,0 mm /130 g pad MMPP0327 1
315 Shaft balancer 8,0 mm/ 130 g pad MMPP0328 1
316 Bearing AMPP0316 1
317 Rubber seal AMPP0317 1
318 Washer (optional) AMPP0318 opt.
319 Retaining ring AMPP0319 1
8995603201 320 Spindle A+320 MPP0320 1
8995603211 321 Brake seal MPP0321 1
8292502011 323 Mirka backing pad 125 mm, 28 H 5/16" Grip Med. 100 g - 1
8292605011 323 Mirka backing pad 150 mm, 48 H 5/16" Grip Med. 130 g - 1
8292501011 323 Mirka backing pad 125 mm, NH 5/16" PSA M 100 g - 1
8292601011 323 Mirka backing pad 150 mm, NH 5/16" PSA M 130 g - 1
324 Bearing BMPP0324 1
Parts list – spare parts & accessories

6Mirka® PROS • 150 mm (6") • 125 mm (5") Mirka® PROS • 150 mm (6") • 125 mm (5") 7
Mirka code Item Description Kit Part No Quantity
325 Balance screws MMPP0325 2
8995604011 401 Connector – PROS CV MPP0401 1
402 Muffler connection NMPP0402 1
404 Nozzle DMPP0404 1
405 Muffler DMPP0405 1
406 Muffler cap DMPP0406 1
407 Vacuum adapter GMPP0407 1
408 O-ring GMPP0408 1
409 Swivel grip GMPP0409 1
410 Swivel connector GMPP0410 1
411 O-ring I, N MPP0411 2
8995604121 412 Mirka pad wrench 24 mm (supplied with each tool) MPP0412 1
8995604131 413 Eductor tube – PROS DB MPP0413 1
414 Hose air tube OMPP0414 1
8995604151 415 Dust bag MPP0415 1
8995604161 416 Connector – PROS DB MPP0416 1
417 Muffler connection IMPP0417 1
MIN6529211 418 Fastening straps 6/pack OMPP0418 5
419 Hose assembly 1,8 m – PROS DB OMPP0419 1
8995604201 420 Vacuum adapter – PROS NV MPP0420 1
421 Muffler connection PMPP0421 1
422 O-ring DMPP0422 1
423 Powder metal silencer DMPP0423 1
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 XXX
125 mm (5"), 100 g PSA 8292501011 X X X
150 mm (6"), 130 g PSA 8292601011 XXX
*Soft and hard pad variants available as accessories
NOTE! Repairs done by non-authorized repairer will breach the Mirka warranty.
Power tool must be serviced by a qualified repair person and in accordance with national requirements.

50 Mirka® PROS • 150 mm (6") • 125 mm (5")
en
Declaration of conformity
Mirka Ltd, 66850 Jeppo, Finland
declare on our sole responsibility that the products Mirka® PROS 150 mm (6") & 125 mm (5") Pneumatic Random
Orbital Sander (see “Technical data”table for particular model) to which this declaration relates are in conformity
with the following standard or other normative document: EN ISO 15744:2008. Following the provisions of
89/392/EEC as amended by 91/368/EEC & 93/44/EEC 93/68/EEC Directives and consolidating Directive 2006/42/EC.
Jeppo 13.08.2020
Place and date of issue Company Stefan Sjöberg, CEO
Operating instructions include:
Exploded view, Parts list, Declaration of
conformity, Important, Required personal
safety equipment, Please read and comply
with, Warning, Caution, Additional safety
warnings, Technical data, Proper use of
tool, Work stations, Operating instructions,
Maintenance, Troubleshooting guide,
Reducing vibrations with pad saver or
interface.
Manufacturer/ Supplier
Mirka Ltd
66850 Jeppo, Finland
Tel. [phone]
Fax [phone]
www.mirka.com
Important
Read these safety and operating instructions carefully before installing, operating or maintaining this tool. Keep these
instructions in a safe, accessible location.
Original instructions. We reserve the right to make changes to this manual without prior notice.
Read
operator’s manual
Wear
safety glasses
Wear
ear protection
Wear
safety gloves
Wear
face mask
Required personal safety equipment
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

50 Mirka® PROS • 150 mm (6") • 125 mm (5") Mirka® PROS • 150 mm (6") • 125 mm (5") 51
en
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 work piece 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 psi).
• 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.

52 Mirka® PROS • 150 mm (6") • 125 mm (5")
en
Technical data
Mirka® 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 – Central Central Central Central Central
Pad size 125 mm (5") 125 mm (5") 125 mm (5") 150 mm (6") 150 mm (6") 150 mm (6")
Product net weight 0.89 kg (1.96 lbs) 0.89 kg (1.96 lbs) 0.91 kg (2.01 lbs) 0.90 kg (1.98 lbs) 0.93 kg (2.05 lbs) 0.95 kg (2.09 lbs)
Height 102 mm (4.02") 102 mm (4.02") 102 mm (4.02") 102 mm (4.02") 102 mm (4.02") 102 mm (4.02")
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 75 dB(A) CV: 76 dB(A)
NV: 75 dB(A)
CV: 78 dB(A)
NV: 77 dB(A)
CV: 75 dB(A)
NV: 75 dB(A)
CV: 76 dB(A)
NV: 76 dB(A)
CV: 77 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/s22.4 m/s23.8 m/s22.3 m/s23.2 m/s23.4 m/s2
Uncertainty K*0.8 m/s20.8 m/s20.9 m/s20.7 m/s20.8 m/s20.8 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.
Mirka® 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 125 mm (5") 125 mm (5") 150 mm (6") 150 mm (6") 150 mm (6")
Product net weight** 0.89 kg (1.96 lbs) 0.91 kg (2.01 lbs) 0.90 kg (1.98 lbs) 0.93 kg (2.05 lbs) 0.95 kg (2.09 lbs)
Height 102 mm (4.02") 102 mm (4.02") 102 mm (4.02") 102 mm (4.02") 102 mm (4.02")
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 485 lpm 485 lpm 485 lpm 485 lpm 485 lpm
Vibration level *2.8 m/s23.5 m/s22.3 m/s23.0 m/s22.5 m/s2
Uncertainty K*0.8 m/s20.8 m/s20.7 m/s20.8 m/s20.7 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 from laboratory testing in conformity with stated codes and standards, and are
not sufficient for risk evaluation. Values measured in a particular work place 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 in which the individual works, the particular material
being worked, work station design as well as upon the exposure time and the physical condition of the user. Mirka
Ltd cannot be held responsible 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)

52 Mirka® PROS • 150 mm (6") • 125 mm (5") Mirka® PROS • 150 mm (6") • 125 mm (5") 53
en
Filter
Regulator
Figure 1
Lubricator
Air hose to your power tool
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 125 mm (5") or 150 mm (6") 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 used in any position but before any such use, the operator must be in a secure
position, have 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 shut-
off 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).

54 Mirka® PROS • 150 mm (6") • 125 mm (5")
en
Replacing the backing pad
1. Insert the pad wrench between the backing pad and brake seal to hold the spindle nut.
2. Turn the backing pad counterclockwise to remove it.
3. Fit and tighten the new backing pad with washers.
4. 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.
1. Remove the backing pad as described above.
2. Pull the old brake seal out of its groove.
3. Fit the new brake seal in the groove.
4. Fit the backing pad as described above.
5. 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 CV/NV
• 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.
Always disconnect the air supply before maintenance!
Only use original Mirka spare parts!
Maintenance

54 Mirka® PROS • 150 mm (6") • 125 mm (5") Mirka® PROS • 150 mm (6") • 125 mm (5") 55
en
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).
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 O-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. Disassemble, inspect and replace worn or damaged parts.
Incorrect assembly of air valve. 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.

56 Mirka® PROS • 150 mm (6") • 125 mm (5")
en
Reducing vibrations when sanding with pad saver or interface
When pad saver or interface is used for sanding the set-up may increase the level of vibrations. Your Mirka tool has a
feature allowing you to reduce these vibrations. To reduce vibrations that may appear when a pad saver or interface is
used please follow these steps:
1. Disconnect air supply.
2. Remove backing pad.
3. Add hex nuts and screws in accordance with the table below, tighten to 2 Nm.
NOTE! If the sander is used with an interface it is recommended that the speed is set to a maximum of 7,000 rpm.
Example
1. Machine configuration out of box.
3. Machine configuration out of box.
2. Machine configuration for use with pad saver or interface.
4. Machine configuration for use with pad saver or interface.
Model Picture Set-up out of box
Screw Hex nut
A B C D E A B C D E
550 1 – X X – – – – – – –
580 1 – X X – – – – – – –
625 1 – X X – – – – – – –
650 1 – X X – – – – – – –
680 3 – X – X X – – – – –
Model Picture Set-up for pad saver / interface
Screw Hex nut
A B C D E A B C D E
550 2 X X X – – X X X – –
580 2 X X X – – X X X – –
625 2 X X X – – X X X – –
650 2 X X X – – X X X – –
680 4 X X X X X – – – – –

Mirka Ltd
Finland
Brazil Mirka Brasil Ltda.
Belgium Mirka Belgium Logistics NV
Canada Mirka Canada Inc.
China Mirka Trading Shanghai Co., Ltd
Finland & Baltics Mirka Ltd
France Mirka France Sarl
Germany Mirka GmbH
India Mirka India Pvt Ltd
Italy Mirka Italia s.r.l., Cafro S.p.A.
Mexico Mirka Mexicana S.A. de C.V.
Russia Mirka Rus LLC
Singapore Mirka Asia Pacific Pte Ltd
Spain Mirka Ibérica S.A.U.
Sweden Mirka Scandinavia AB
Turkey Mirka Turkey Zımpara Ltd Şirketi
United Kingdom Mirka (UK) Ltd
United Arab Emirates Mirka Middle East FZCO
USA Mirka USA Inc.
For contact information,
please visit www.mirka.com
©Mirka Ltd 08/2020
Dedicated to the finish