MIRKA DEROS II Electric Random Orbital Sanders Instruction Manual

: June 7, 2024
: MIRKA

Table of Contents

MIRKA DEROS II Electric Random Orbital Sanders
Exploded view DEROS 325 & 350
General Power Tool Safety Warnings
Technical data
Operating instructions
Maintenance
Troubleshooting guide
Documents / Resources

MIRKA DEROS II Electric Random Orbital Sanders

Figure 1

Pad Medium ***| Mirka code| 325| 350| 550| 625| 650| 680| 750
---|---|---|---|---|---|---|---|---
77 mm (3″), 30 g| 8294791211| X| X| | | | |
125 mm (5″), 100 g| 8292502011| | | X| | | |
125 mm (5″), 130 g| 8292502511| | | | | | |
150 mm (6″), 130 g| 8292605011| | | | X| X| X|
175 mm (7″), 165 g**| 8292703011| | | | | | | X

Soft and hard pad variants available as accessories.

Exploded view DEROS 325 & 350

Exploded view DEROS 550, 625, 650, 680 & 750

Parts list – DEROS 325 & 350 kits

Mirka code Item Description Kit Quantity Tightening torgue

MIE6520211| | Start Button Kit| A| |
| 2| Start Button| | 1|
| 3| Start Button Spring| | 1|
MIE6520511| | Screw Kit| B| |
| 5| Screw 2,5 x 10 mm| | 4| 0,5 Nm/0,4 ft-lb
| 9| Housing Screw 3 x 25 mm| | 2| 1,4 Nm/1,0 ft-lb
| 17| Screw 2,5 x 25 mm| | 2| 0,5 Nm/0,4 ft-lb
MIE3521011| | Swivel Exhaust Kit| C| |
| 9| Housing Screw 3 x 25 mm| | 2| 1,4 Nm/1,0 ft-lb
| 10| Swivel Exhaust| | 1|
MIE7515011| | Type Label Kit, DEROS II EU 3xx, 550, 625, 680, 750 230V| D| |
| 25| Type Label 325| | 5|
| 25| Type Label 350| | 5|
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 – DEROS 325 & 350 spareparts & accessories

Mirka code Item Description Kit Quantity Tightening torgue

MIE6210111| 1| Lever 2,5 mm| | 1|
MIE6510111| 1| Lever 5,0 mm| | 1|
| 2| Start button| A| 1|
| 3| Start Button Spring| A| 1|
MIE6510411| 4| Cover Plate| | 1|
| 5| Screw 2,5 x 10 mm| B| 4| 0,5 Nm/0,4 ft-lb
MIE6510611| 6| Speed Controller | | 1|
MIE9016011| 7| Rewireable Mains Cable 4,3m CE 230V EU| | 1|
MIE9017011| 7| Rewireable Mains Cable 4,3m CE 230V UK| | 1|
MIE9017111| 7| Rewireable Mains Cable 4,3m CE 230V CH| | 1|
MIE9017511| 7| Rewireable Mains Cable 4,3m CE 230V ANZ| | 1|
MIE9017611| 7| Rewireable Mains Cable 4,3m CE 230V ARG| | 1|
MIE6517411| 7| Rewireable Mains Cable 4,3 m 230V CN| | 1|
MIE3520811| 8| Housing| | 1|
| 9| Housing Screw 3 x 25 mm| B,C| 2| 1,4 Nm/1,0 ft-lb
| 10| Swivel Exhaust| C| 1|
MIE3221111| 11| Motor 2,5 mm/30 g Pad (77 mm)| | 1| 25 Nm/18,4 ft-lb
MIE3521111| 11| Motor 5,0 mm/30 g Pad (77 mm)*| | 1| 25 Nm/18,4 ft-lb
MIE3511211| 12| Fan 2,5/5,0mm/30g Pad (77 mm)| | 1|
MIE3521311| 13| Spindle Bearing kit| | 1|
MIE3512211| 14| Brake Seal| | 1|
8993008013| 15| Pad Wrench 17mm| | 1|
8294791211| 16| Backing Pad 77mm 1/4″ Grip 6H Medium| | 1|
| 17| Screw 2,5 x 25 mm| B| 1| 0,5 Nm/0,4 ft-lb
| 25| Type Label| D| 1|

Spare parts only available to authorized repairers.

Parts list – DEROS 550, 625, 650, 680 & 750 kits

Mirka code Item Description Kit Quantity Tightening torgue

MIE6520211| | Start Button Kit| A| |
| 2| Start Button| | 1|
| 3| Start Button Spring| | 1|
MIE6520511| | Screw kit| B| |
| 5| Screw 2.5 x 10 mm| | 4| 0,6 Nm/0,4 ft-lb
| 9| Housing Screw 3 x 25 mm| | 2| 1,4 Nm/1,0 ft-lb
| 13| Screw 2.5 x 25 mm| | 2| 0,6 Nm/0,4 ft-lb
MIE6521011| | Swivel Exhaust kit| C| |
| 9| Housing Screw 3 x 25 mm| | 2| 1,4 Nm/1,0 ft-lb
| 10| Swivel Exhaust| | 1|
MIE6536211| | Bearing Dual Seal kit (125 & 150 mm)| D| |
| 14| Double Row Bearing| | 1|
| 15| Dual Seal Washer| | 1|
| 16| Retaining Ring| | 1|
MIE6536011| | Spindle Bearing Dual Seal kit (125 & 150mm)| E| |
| 14| Double Row Bearing| | 1|
| 15| Dual Seal Washer| | 1|
| 16| Retaining Ring| | 1|
| 17| Spindle 5/16″| | 1|
MIE7536011| | Spindle Bearing Dual Seal kit (175mm)| E| |
| 14| Double Row Bearing| | 1|
| 15| Dual Seal Washer| | 1|
| 16| Retaining Ring| | 1|
| 17| Spindle M9| | 1|
8995690101| | Balancing Screw kit| F| |
| 21| Screw M3.5 x 10 mm| | 5|
| 22| Nut M3.5 mm| | 3|
| | Hex Key 2.5 mm| | 1|
MIE6565011| 25| Type Label kit DEROS II EU (650)| G| 10|
MIE6522511| 25| Type Label kit DEROS II EU (750)| G| 10|
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 –DEROS550, 625, 650, 680 & 750 spare parts & accessories

Mirka code Item Description Kit Quantity Tightening torgue

MIE6210111| 1| Lever 2,5 mm (150 mm)| | 1|
MIE6510111| 1| Lever 5,0 mm (125 & 150 mm)| | 1|
| 2| Start Button| A| 1|
| 3| Start Button Spring| A| 1|
MIE6510412| 4| Cover Plate| | 1|
| 5| Screw 2.5 x 10 mm| B| 4| 0,6 Nm/0,4 ft-lb
MIE6510611| 6| Speed Controller| | 1|
MIE9016011| 7| Rewireable Mains Cable 4,3m CE 230V EU| | 1|
MIE9017011| 7| Rewireable Mains Cable 4,3m CE 230V UK| | 1|
MIE9017111| 7| Rewireable Mains Cable 4,3m CE 230V CH| | 1|
MIE9017511| 7| Rewireable Mains Cable 4,3m CE 230V ANZ| | 1|
MIE9017411| 7| Rewireable Mains Cable 4,3m 230V CN| | 1|
MIE6520811| 8| Housing| | 1|
| 9| Housing Screw 3 x 25 mm| B,C| 2| 1,4 Nm/1,0 ft-lb
| 10| Swivel Exhaust| C| 1|
MIE5521111| 11| Motor 5,0 mm/100 g Pad (125 mm)| | 1| 25 Nm/18,4 ft-lb
MIE6221111| 11| Motor 2,5 mm/130 g Pad (150 mm)| | 1| 25 Nm/18,4 ft-lb
MIE6521111| 11| Motor 5,0 mm/130 g Pad (150 mm)| | 1| 25 Nm/18,4 ft-lb
MIE6821111| 11| Motor 8,0 mm/130 g Pad (150 mm)| | 1| 25 Nm/18,4 ft-lb
MIE7521111| 11| Motor 5,0 mm/165 g Pad (175 mm)| | 1| 25 Nm/18,4 ft-lb
MIE65111B1| 11- B| Ground Wire| | 1|
MIE5511211| 12| Fan 5,0 mm/100 g Pad (125 mm)| | 1|
MIE6211211| 12| Fan 2,5 mm/130 g Pad (150 mm)| | 1|
MIE6511211| 12| Fan 5,0 mm/130 g Pad (150 mm)| | 1|
MIE6811211| 12| Fan 8,0 mm/130 g Pad (150 mm)| | 1|
MIE7511211| 12| Fan 5,0 mm/165 g Pad (175 mm)| | |
| 13| Screw 2.5 x 25 mm| B| 2| 0,6 Nm/0,4 ft-lb
| 14| Double Row Bearing| D,E| 1|
| 15| Dual Seal Washer| D,E| 1|
| 16| Retaining Ring| D,E| 1|
8995603201| 17| Spindle 5/16” (125 & 150mm)| E| 1|
| 17| Spindle M9 (175 mm)| E| |
8995604121| 18| Pad Wrench 24mm| | 1|
8995603211| 19| Brake Seal| | 1|
8292502011| 20| Backing Pad Net 125 mm 5” 5/16” 28H Medium 100 g| | 1|
8292502511| 20| Backing Pad Net 125 mm 5” 5/16” 28H Medium 130 g| | 1|
8292605011| 20| Backing Pad Net 150 mm 6” 5/16” 48H Medium 130 g| | 1|
8292703011| 20| Backing Pad Net 175 mm 7″ M9 37H Medium 165g| | |
| 21| Screw M3.5 x 10 mm| F| 5|
| 22| Nut M3.5 mm| F| 3|
| 25| Type Label| G| 1|

Spare parts only available to authorized repairers.

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 62841-1:2015, EN 62841-2-4:2014, EN IEC 55014-1:2021, EN IEC 55014-2:2021, EN 61000-3-2:2014, EN 61000-3-3:2013, EN 300 328 V2.2.2, EN 301 489-1 V2.2.3, EN 301 489-17

V3.2.4, EN IEC 63000:2018 in accordance with the regulations 2006/42/EC, 2011/65/EU, 2014/53/EU.

Jeppo 14.11.2023

| | | 66850 Jeppo, Finland

Tel. +358 20 760 2111

Fax +358 20 760 2290

Place and date of issue| Company| Stefan Sjöberg, CEO| 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. Required personal safety equipment.

Symbols

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.

General Power Tool Safety Warnings

WARNING Read all safety warnings and all instructions. Failure to follow the warnings and instructions may result in electric shock, fire and/or serious injury. Save all warnings and instructions for future reference. The term “power tool” in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.

Work area safety
- a. Keep work area clean and well lit. Cluttered or dark areas invite accidents.
- b. Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases or dust. Power tools create sparks which may ignite the dust or fumes.
- c. Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.
Electrical safety
- a. Power tool plugs must match the outlet. Never modify the plug in any way. Do not use any adapter plugs with earthed (grounded) power tools. Unmodified plugs and matching outlets will reduce risk of electric shock.
- b. Avoid body contact with earthed or grounded surfaces, such as pipes, radiators, ranges and refrigerators. There is an increased risk of electric shock if your body is earthed or grounded.
- c. Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.
- d. Do not abuse the cord. Never use the cord for carrying, pulling or unplugging the power tool. Keep cord away from heat, oil, sharp edges and moving parts. Damaged or entangled cords increase the risk of electric shock.
- e. When operating a power tool outdoors, use an extension cord suitable for outdoor use. Use of a cord suitable for outdoor use reduces the risk of electric shock.
- f. If operating a power tool in a damp location is unavoidable, use a residual current device (RCD) protected supply. Use of an RCD reduces the risk of electric shock.
Personal safety
- a. Stay alert, watch what you are doing and use common sense when operating a power tool. Do not use a power tool while you are tired or under the influence of drugs, alcohol or medication. A moment of inattention while operating power tools may result in serious personal injury.
- b. Use personal protective equipment. Always wear eye protection. Protective equipment such as a dust mask, non-skid safety shoes, hard hat, or hearing protection used for appropriate conditions will reduce personal injuries.
- c. Prevent unintentional starting. Ensure the switch is in the off-position before connecting to power source and/or battery pack, picking up or carrying the tool. Carrying power tools with your finger on the switch or plugging in tools when the switch is in the on-position invites accidents.
- d. Remove any adjusting key or wrench before turning the power tool on. A wrench or a key left attached to a rotating part of the power tool may result in personal injury.
- e. Donot overreach. Keep proper footing and balance at all times. This enables better control of the power tool in unexpected situations.
- f. Dress properly. 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.
- g. If devices are provided for the connection of dust extraction and collection facilities, ensure these are connected and properly used. Use of dust collection can reduce dust-related hazards.
- h. Do not let familiarity gained from frequent use of tools allow you to become complacent and ignore tool safety principles. A careless action can cause severe injury within a fraction of a second.
Power tool use and care
- a. Do not overload the power tool. Use the correct power tool for your application. The correct power tool will do the job better and safer at the rate for which it was designed.
- b. Do not use the power tool if the switch does not turn it on and off. Any power tool that cannot be controlled with the switch is dangerous and must be repaired.
- c. Disconnect the plug from the power source and/or the battery pack from the power tool before making any adjustments, changing accessories, or storing power tools. Such preventive safety measures reduce the risk of starting the power tool accidentally.
- d. Store idle power tools out of the reach of children and donot allow persons unfamiliar with the power tool or these instructions to operate the power tool. Power tools are dangerous in the hands of untrained users.
- e. Maintain power tools and accessories. Check for misalignment or binding of moving parts, breakage of parts and any other condition that may affect the power tool’s operation. If damaged, have the power tool repaired before use. Many accidents are caused by poorly maintained power tools.
- f. Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting edges are less likely to bind and are easier to control.
- g. Use the power tool, accessories and tool bits etc. in accordance with these instructions, taking into account the working conditions and the work to be performed. Use of the power tool for operations different from those intended could result in a hazardous situation.
- h. Keep handles and grasping surfaces dry, clean and free from oil and grease. Slippery handles and grasping surfaces do not allow for safe handling and control of the tool in unexpected situations.
Service
- a. Have your power tool serviced by a qualified repair person using only identical replacement parts. This will ensure that the safety of the power tool is maintained.

Only for AS/NZS : Mirka recommend that the tool shall be supplied via a residual current device having a rated residual current of 30 mA or less.

Additional Safety Warnings

The safety of the tool is granted only by using original Mirka backing pads.
Read the Materials Safety Data Sheet (MSDS) for the work surface.
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.
The power supply socket and connector are non-IEC appliance couplers. Only use an original Mirka power supply cable. The Mirka power supply cable can be bought from your Mirka Dealer.
Check the tool, backing pad, power cord and fittings regularly for wear. If the power supply cable is damaged it must be replaced by an original Mirka power supply cable.
Clean or replace the dust extractor´s collection bag daily. Dust can be highly combustible. Cleaning or replacing the bag also assures optimum performance.
If the tool appears to malfunction, stop using it immediately and arrange for service and repair.
Always ensure that the work piece to be sanded is firmly fixed in place.
Keep hands clear of the spinning accessory during use.
Do not allow the tool to free speed without taking precautions to protect surrounding people and objects in the event that the abrasive or backing pad should come loose.

Technical data

DEROS II| 325| 350| 550| 625| 650| 680| 750
---|---|---|---|---|---|---|---
Power| 300 W| 300 W| 400 W| 400 W| 400 W| 400 W| 400 W
Mains voltage| 220-240 VAC| 220-240 VAC| 220-240 VAC| 220-240 VAC| 220-240 VAC| 220- 240 VAC| 220- 240 VAC
Speed| 4,000- 10,000

rpm

| 4,000-10,000

rpm

| 4,000-10,000

rpm

| 4,000-10,000

rpm

| 4,000-10,000

rpm

| 4,000-10,000

rpm

| 6,000-9,000 rpm
Orbit| 2.5 mm (3/32″)| 5 mm (3/16″)| 5 mm (3/16″)| 2.5 mm (3/32″)| 5 mm (3/16″)| 8 mm (5/16″)| 5 mm (3/16″)
Size of backing pad| Ø 77 mm (3″)| Ø 77 mm (3″)| Ø 125 mm (5″)| Ø 150 mm (6″)| Ø 150 mm (6″)| Ø 150 mm (6″)| Ø 175 mm (7″)
Weight| 0.8 kg (1.8 lbs)| 0.8 kg (1.8 lbs)| 1 kg (2.2 lbs)| 1 kg (2.2 lbs)| 1.1 kg (2.4 lbs)| 1.1 kg (2.4 lbs)| 1.1 kg (2.4 lbs)
Degree of protection| I| I| I| I| I| I| I

Noise and vibration information
The measured values may be used for comparing one tool with another and in a preliminary assessment of exposure.

DEROS II| 325| 350| 550| 625| 650| 680| 750
---|---|---|---|---|---|---|---
Sound pressure level (L pA)| 67 dB(A)| 67 dB(A)| 71 dB(A)| 71 dB(A)| 71 dB(A)| 71 dB(A)| 71 dB(A)
Sound power level (L WA)| 78 dB(A)| 78 dB(A)| 82 dB(A)| 82 dB(A)| 82 dB(A)| 82 dB(A)| 82 dB(A)
Sound measurement uncertainty K WA| 3.0 dB(A)| 3.0 dB(A)| 3.0 dB(A)| 3.0 dB(A)| 3.0 dB(A)| 3.0 dB(A)| 2.5 dB(A)
Vibration emission value a h ***| 3.1 m/s2| 3.3 m/s2| 3.2 m/s2| 2.4 m/s2| 3.4 m/s2| 3.5 m/s2| 2.8 m/s2
Vibration emission uncertainty K PA**

| 2.0 m/s2| 1.5 m/s2| 1.5 m/s2| 1.5 m/s2| 1.5 m/s2| 1.5 m/s2| 1.5 m/s2

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 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 the individual operates the machinery, the particular material being worked, work station design and the user’s exposure time and physical condition. Mirka accepts no responsibility for the consequences of using declared values instead of actual exposure values for any individual risk assessment. 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)

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 tool can develop a torque reaction. See the section “Operating instructions”.

How to get started

When unpacking the tool, make sure it is intact, complete and has not been damaged in transport. Never use a damaged tool. Before use, check that the backing pad is correctly attached and tightened. Connect the power cord to the tool. Connect the power cord to a grounded outlet (220-240 VAC, 50-60Hz). In order to get the maximum power from this tool it is recommended to use it with the Mirka dust extractor (or other suitable dust extraction unit) and Mirka net sanding products. The combination of Mirka sanders, Mirka net sanding products and Mirka dust extractor are the basis of Mirka dust-free sanding solutions. The power cord from the tool is connected to the mains supply of the dust extractor. By connecting the tool’s power cord to the outlet on the dust extractor it is possible to use the dust extractor’s autostart function.

Operating instructions

The tool is intended to be operated as a hand held tool. The tool can be used in any position. Note! The sander can develop a torque reaction when started.
Make sure the sander is switched off. Select a suitable abrasive and secure it to the backing pad. Make sure the abrasive is centred on the backing pad. For optimal performance we recommend a Mirka backing pad and Mirka Net Sanding product.
Switch on the sander by pressing the On/Off key, see Figure 1. The sander Multi-purpose LED is now flashing green, see Figure 1.
The sander can now be started by pressing the lever.
The speed can be adjusted between 4,000 rpm and max by adjusting the position of the lever.
The max rpm can be adjusted by pressing speed+ or speed–, see Figure 1. Each press increases or reduces the speed by 1,000 rpm (DEROS II 750: 500 rpm) until it reaches the limits. For model specific rpm limits, please see technical data chapter.
The tool has two speed control modes. In the default mode the speed can be adjusted linearly by changing the position of the lever. In the other mode the speed remains fixed at the set max rpm when the tool is running. When the rpm+ and rpm– buttons are pressed simultaneously the tool toggles between the two controlling modes.
When sanding, always place the tool on the work surface before starting the tool. Always remove the tool from the work surface before stopping it. This will prevent gouging of the work surface due to excess speed of the abrasive.
When sanding is finished, turn off the sander by pressing the On/Off key. All LEDs are turned off except wireless indication LED, if the tool is connected.

Bluetooth
This tool is equipped with Bluetooth® low energy technology and can be connected to MyMirka app through which additional tool functionality can be accessed. For more information on the app functionality and if it is available in your country, go to www.mirka.com/mymirka

Activate Bluetooth on your Mirka® DEROS II as follows:

Connect the power cord to mains outlet.
Press and hold the Speed+ button while switching the tool on with the On/Off button.
Wireless indication LED starts blinking blue, to indicate that Bluetooth is active. The LED turns solid when connection is established.
Bluetooth is deactivated when the tool is disconnected from mains outlet.
NOTE! If the app is not installed or if it is not available in your country, Bluetooth shall not be activated. The Bluetooth® word mark and logos are registered trademarks owned by the Bluetooth SIG, Inc. and any use of such marks by Mirka Ltd is under license. Other trademarks and trade names are those of their respective owners.

Reducing vibration when sanding with pad saver or interface
When pad saver or interface is used for sanding, this set-up may increase the level of vibration. Your Mirka tool has a feature that allowing to reduce this vibration. To reduce vibration that may occur when a pad saver or interface is used, please follow these steps:

Disconnect power cable.
Remove backing pad.
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.

Edge protector
The edge protector is a accessory that can be attached to the machine to prolong the lifetime of the backing pad due to the pad not being in contact with materials. Using the Edge Protector when sanding into corners and edges, the backing pad doesn’t scratch or damage adjacent surfaces.

Attaching the edge protector (if provided)

Disconnect power cable and place the machine on a flat surface.
Attach the edge protector by stretching both ends outwards a little and mount it onto the sander.
Check that the brake seal is still in place.

Maintenance

Always disconnect the power 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 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.

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.

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, your Mirka dealer or go to www.mirka.com

Troubleshooting guide

Symptom Possible cause Solution

The Multi purpose LED flashes between red and green.| Connected to a mains outlet with wrong voltage.| Connect the tool to a mains outlet that correspond with the nominal voltage of the tool.
No light from Multi purpose LED when switched on.| Power cord not properly attached to the sander or to the mains socket.| Connect it properly.
The Multi purpose LED is red and the tool slows down to the minimum speed setting when sanding.| Temperature too high in the tool

Too heavy long term load.

| Reduce the load on the tool for some time and the tool will speed up again.
The Multi purpose LED is red and rpm is slightly reduced.| Too heavy short term load.| Use lighter load and the LED (right) will automatically change to green.
Brake seal does not work.| Worn out brake seal or damaged spindle bearing.| Check and replace brake seal or spindle bearing if necessary
The tool has stopped and the Multi purpose LED is red.| The tool is in safety mode due to high temperature.| Wait until the tool has cooled down.

Disposal information

DANGER: Render redundant power tools unusable by removing the power cord. Observe applicable country-specific regulations regarding disposal and recycling of disused machines, packaging and accessories.

EU only: Do not dispose electric power tools in house-hold waste. According to European Directives on waste electrical and electronic equipment and its implementation under national law, electric tools that have reached the end of their life must be collected separately and taken to an environmentally compatible recycling facility. For more information regarding REACH, RoHS and our corporate social responsibility visit www.mirka.com

Documents / Resources

| MIRKA DEROS II Electric Random Orbital Sanders [pdf] Instruction Manual
325, 350, 550, 625, 650, 680, 750, DEROS II Electric Random Orbital Sanders, DEROS II, Electric Random Orbital Sanders, Random Orbital Sanders, Orbital Sanders, Sanders
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