BOSCH GEX 34-125 Professional Orbit Sander Instruction Manual

BOSCH GEX 34-125 Professional Orbit Sander

Safety Instructions

General Power Tool Safety Warnings

WARNING Read all safety warnings, instructions, illustrations, and specifications provided with this power tool. Failure to follow all instructions listed below 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

• Keep the work area clean and well-lit. Cluttered or dark areas invite accidents.
• Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases or dust. Power tools create sparks that may ignite dust or fumes.
• Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.

Electrical safety

• 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.
• 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.
• Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.
• Do not abuse the cord. Never use the cord for carrying, pulling or unplugging the power tool. Keep the cord away from heat, oil, sharp edges or moving parts. Damaged or entangled cords increase the risk of electric shock.
• When operating a power tool outdoors, use an extension cord suitable for outdoor use. The use of a cord suitable for outdoor use reduces the risk of electric shock.
• If operating a power tool in a damp location is unavoidable, use a residual current device (RCD) protected supply. The use of an RCD reduces the risk of electric shock.

Personal safety

• 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.
• 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.
• Prevent unintentional starting. Ensure the switch is in the off-position before connecting to a power source and/or battery pack, picking up or carrying the tool. Carrying power tools with your finger on the switch or energizing power tools that have the switch on invites accidents.
• 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.
• Do not overreach. Keep proper footing and balance at all times. This enables better control of the power tool in unexpected situations.
• Dress properly. Do not wear loose clothing or jewelry. Keep your hair and clothing away from moving parts. Loose clothes, jewelry or long hair can be caught in moving parts.
• If devices are provided for the connection of dust extraction and collection facilities, ensure these are connected and properly used. The use of dust collection can reduce dust-related hazards.
• Do not let familiarity gained from the 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

• Do not force 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.
• 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.
• Disconnect the plug from the power source and/or remove the battery pack, if detachable, 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.
• Store idle power tools out of the reach of children and do not 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.
• 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.
• Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting edges are less likely to bind and are easier to control.
• 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.
• 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

• 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.

Safety Warnings for Sander

• Only use the power tool for dry sanding. Water entering a power tool will increase the risk of electric shock.
• Ensure that no persons are at risk due to flying sparks. Remove combustible materials from the surrounding area. Flying sparks are created when sanding metals.
• Warning: Danger of fire! Avoid overheating the workpiece and the sander. Always empty the dust collector before taking a break from work. Sanding dust in the dust bag, microfilter, paper bag (or in the filter bag or vacuum cleaner filter) can spontaneously combust under certain conditions, for example, if flying sparks are created when sanding metals. This risk is increased if the sanding dust is mixed with paint or polyurethane residue or with other chemical substances and if the workpiece is hot as a result of prolonged work.
• Clean the air vents on your power tool regularly. The motor’s fan will draw dust inside the housing and excessive accumulation of powdered metal may cause electrical hazards.
• Hold the power tool firmly with both hands and make sure you have a stable footing. The power tool can be more securely guided with both hands.
• Always wait until the power tool has come to a complete stop before placing it down.
• Secure the workpiece. A workpiece clamped with clamping devices or in a vice is held more securely than by hand.

Products sold in GB only
Your product is fitted with a BS 1363/A approved electric plug with an internal fuse (ASTA approved to BS 1362).

If the plug is not suitable for your socket outlets, it should be cut off and an appropriate plug fitted in its place by an authorized customer service agent. The replacement plug should have the same fuse rating as the original plug. The severed plug must be disposed of to avoid a possible shock hazard and should never be inserted into a main socket elsewhere.

Product Description and Specifications

Read all the safety and general instructions.
Failure to observe the safety and general instructions may result in electric shock, fire and/or serious injury. Please observe the illustrations at the beginning of this operating manual.

Intended Use
The power tool is intended for dry sanding of wood, plastic, metal, filler and varnished surfaces. Power tools with electronic control are also suitable for polishing.

Product Features

The numbering of the product features refers to the diagram of the power tool on the graphics page.

1. Auxiliary handle (insulated gripping surface) a)
2. Screw for auxiliary handle a)
3. Orbital stroke rate preselection thumbwheel
4. On/off switch
5. Lock-on button for on/off switch
6. Complete dust box (Microfilter system) a)
7. Hex key
8. Sanding pad
9. Handle (insulated gripping surface)
10. Sanding sheet a)
11. Screw for sanding pad
12. Bracket for dust box a)
13. Plastic slider
14. Extraction outlet
15. Locking lever for dust box a)
16. Filter element (Microfilter system) a)
17. Dust extraction adapter a)
18. Dust extraction hose a)
19. Dust bag a

Accessories shown or described are not included with the product as standard. You can find the complete selection of accessories in our accessories range.

Technical data

Random orbit sander|  | GEX 34-125| GEX 34-125| GEX 34-150| GEX 34-150
---|---|---|---|---|---
Article number|  | 3 601 C72 3..| 3 601 C72 3..| 3 601 C72 8..| 3 601 C72 8..
Dust box included with the product|  | ●| –| ●| –
Orbital stroke rate preselection|  | ●| ●| ●| ●
Rated power input| W| 340| 340| 340| 340
No-load speed| min–1| 4500–12,000| 4500–12,000| 4500–12,000| 4500–12,000
No-load orbital stroke rate| min–1| 9000–24,000| 9000–24,000| 9000–24,000| 9000–24,000
Orbit diameter| mm| 5.0| 5.0| 4.0| 4.0
Sanding pad diameter| mm| 125| 125| 150| 150
Weight according to EPTA-Procedure 01:2014| kg| 2.0| 2.0| 2.1| 2.1
Protection class|  | | | |

The specifications apply to a rated voltage [U] of 230 V. These specifications may vary at different voltages and in country-specific models.

Noise/vibration information
GEX 34-125 Noise emission values are determined according to EN 62841-2-4. Typically, the A-weighted sound pressure level of the power tool is 78 dB(A). Uncertainty K = 3 dB. The noise level when working can exceed the volume stated. Wear hearing protection! GEX 34-150 Noise emission values determined according to
EN 62841-2-4.
Typically, the A-weighted noise level of the power tool is: Sound pressure level 81 dB(A); sound power level 92 dB(A). Uncertainty K = 3 dB.

Wear hearing protection!

• GEX 34-125 GEX 34-150
• 3 601 C72 3.. 3 601 C72 8..
• Vibration total values ah (triax vector sum) and uncertainty
• K determined according to EN 62841-2-4:

with an auxiliary handle

The vibration level and noise emission value given in these instructions have been measured in accordance with a standardized measuring procedure and may be used to compare power tools. They may also be used for a preliminary estimation of vibration and noise emissions. The stated vibration level and noise emission value represent the main applications of the power tool. However, if the power tool is used for other applications, with different application tools or is poorly maintained, the vibration level and noise emission value may differ. This may significantly increase the vibration and noise emissions over the total working period. To estimate vibration and noise emissions accurately, the times when the tool is switched off or when it is running but not actually being used should also be taken into account. This may significantly reduce vibration and noise emissions over the total working period. Implement additional safety measures to protect the operator from the effects of vibration, such as servicing the power tool and application tools, keeping their hands warm, and organizing workflows correctly.

Assembly

Pull the plug out of the socket before carrying out any work on the power tool.

Changing the sanding sheet

Remove dirt and dust from the sanding pad (8), e.g. with a paintbrush, before attaching a new sanding sheet. The surface of the sanding pad (8) is fitted with a hook-and-loop fastening, allowing sanding sheets with a similar backing to be secured quickly and easily. Press the sanding sheet (10) firmly onto the underside of the sanding pad (8). To ensure optimum dust extraction, make sure that the punched holes in the sanding sheet are aligned with the drilled holes in the sanding pad.

Selection of the Sanding Plate

The power tool can be fitted with sanding pads of various hardnesses, depending on the application:

• Extra soft sanding pad: Suitable for polishing and sensitive sanding even on curved surfaces
• Soft sanding pad: Suitable for all sanding work, universal application
• Hard sanding pad: Suitable for heavy sanding on flat surfaces

Changing the sanding pad

Note: Replace damaged sanding pads (8) immediately.
Remove the sanding sheet or polishing tool. Unscrew the screw (11) completely and remove the sanding pad (8). Attach the new sanding pad (8) and retighten the screw so that it is finger-tight.
Note: Pads with diameters of 150 mm and 125 mm have different carriers. The pads can only be fitted to the right power tool.
Note: When attaching the sanding pad, make sure that the teeth of the catch mate with the recesses in the sanding pad.
Note: Damaged sanding pads must only be replaced by anafter-sales service center authorized to work with Boschpower tools.

Dust/chip extraction

The dust from materials such as lead paint, some types of wood, minerals, and metal can be harmful to human health. Touching or breathing in this dust can trigger allergic reactions and/or cause respiratory illnesses in the user or people in the near vicinity. Certain dust, such as oak or beech dust, are classified as carcinogenic, especially in conjunction with wood treatment additives (chromate, wood preservative). Materials contain-ing asbestos may only be machined by specialists.

• Use a dust extraction system that is suitable for the material wherever possible.
• Provide good ventilation at the workplace.
• It is advisable to wear a P2 filter class breathing mask.
• The regulations on the material being machined that apply in the country of use must be observed.
• Avoid dust accumulation at the workplace. Dust can easily ignite.

Self-generated dust extraction with dust box

• Before fitting the dust box (6), remove the plastic slider(13). Fit the dust box (6) onto the extraction outlet (14) so that it clicks into place. Make sure that the plastic slider (13)is partly within the bracket (12).
• To empty the dust box (6), press the locking lever (15) onthe side of the dust box (➊). Remove the dust box by pulling it downwards (➋).
• Before opening the dust box (6), knock the dust box against a firm surface as shown in the figure to loosen the dust from the filter element.
• Take hold of the dust box (6) by the recessed grip, fold the filter element (16) upwards out of the way, and empty the dust box. Use a soft brush to clean the flaps of the filter element (16).

External dust extraction

Attach the dust extraction adapter (17) to the extraction outlet (14). Make sure that the locking levers of the dust extraction adapter lock into place. A dust extraction hose with a diameter of 19 mm can be connected to the dust extraction adapter (17).

• To remove the dust extraction adapter (17), press its lock-ing levers down simultaneously and take off the dust extraction adapter.
• The dust extractor must be suitable for the material being worked on.
• When extracting dry dust that is especially detrimental to health or carcinogenic, use a special dust extractor.
• When working on vertical surfaces, hold the power tool with the dust extraction hose facing downwards.

Self-generated dust extraction with dust bag

• A dust bag (accessory) (19) can be used for smaller jobs.
• Before fitting the dust bag (19), remove the plastic slider(13). Firmly attach the dust bag nozzle to the extraction outlet (14). Make sure that the plastic slider (13) is partly within the bracket provided for the dust bag (19).
• Empty the dust bag (19) at regular intervals to maintain optimum dust collection.

Auxiliary Handle

• The auxiliary handle (1) enables comfortable handling and optimum power distribution, with a high sanding removal rate in particular.
• Use screw (2) to secure the auxiliary handle (1) on the housing.

Operation

Starting Operation

• Pay attention to the mains voltage. The voltage of the power source must match the voltage specified on the rating plate of the power tool. Power tools marked with 230 V can also be operated with 220 V.
• Products that are only sold in AUS and NZ: Use a residual current device (RCD) with a nominal residual current of 30 mA or less.

Switching On and Off

• Make sure that you are able to press the On/Off switch without releasing the handle.
• To switch on the power tool, press and hold the on/off switch (4).
• To lock the on/off switch (4) press and hold it while also using the lock-on button (5).
• To switch off the power tool, release the on/off switch (4). If the on/off switch (4) is locked, press the switch first and then release it.

Preselecting the orbital stroke rate

You can even preselect the orbital stroke rate during operation using the necessary orbital stroke rate preselection thumbwheel (3).

• 1–2 Low orbital stroke rate
• 3–4 Medium orbital stroke rate
• 5–6 High orbital stroke rate

The required orbital stroke rate is dependent on the material and the work conditions and can be determined using practice tests. The Constant Electronic keeps the orbital stroke rate at no-load and under load virtually consistent, guaranteeing uni-form performance. After working at a low orbital stroke rate for an extended period, you should operate the power tool at the maximum orbital stroke rate for approximately three minutes withoutload to cool it down.

Sanding Plate Brake
An integrated sanding pad brake reduces the orbital stroke rate when running without load to prevent scoring when the power tool is placed on the workpiece.
If the no-load orbital stroke rate constantly increases over time, this means that the sanding pad is damaged and must be replaced, or that the sanding pad brake is worn. A worn sanding pad brake must be replaced by an after-sales service center authorized to work with Bosch power tools.

Working Advice

• Pull the plug out of the socket before carrying out any work on the power tool.
• Always wait until the power tool has come to a complete stop before placing it down.
• This power tool is not suitable for bench-mounted use. It must not be clamped into a vice or fastened to a workbench, for example.

Sanding Surfaces

• Switch the power tool on, place the entire sanding surface against the surface of the workpiece, and apply moderate pressure as you move the sander over the workpiece.
• The material removal rate and the sanding result are primarily determined by the choice of the sanding sheet, the preselected orbital stroke rate level, and the contact pressure.
• Only immaculate sanding sheets achieve good sanding performance and make the power tool last longer.
• Be sure to apply consistent contact pressure in order to increase the lifetime of the sanding sheets.
• Excessively increasing the contact pressure will not lead to increased sanding performance, rather it will cause more severe wear of the power tool and of the sanding sheet.
• Do not use a sanding sheet for other materials after it has been used to work on metal.
• Use only original Bosch-sanding accessories.

Rough Sanding

• Attach a coarse grit sanding sheet.
• Apply only light pressure to the power tool so that it runs at a higher orbital stroke rate and a higher material removal rate is achieved.

Fine Sanding

• Attach a fine-grit sanding sheet.
• You can reduce the sanding plate orbital stroke rate by lightly varying the contact pressure or changing the orbital stroke rate level; the random orbit motion will be retained.
• Move the power tool with moderate pressure flat on the workpiece in a circular motion or alternately along and across it. Do not tilt the power tool in order to avoid sanding through the workpiece, e.g. veneers.
• Switch the power tool off after completing the operation.

Polishing

• For polishing weathered lacquers and redressing scratches(e.g. acrylic glass), the power tool can be fitted with an appropriate polishing tool, e.g. lambswool bonnet, polishing felt, or polishing sponge (accessory).
• Select a low orbital stroke rate (level 1–2) when polishing in order to avoid heating up the surface excessively.
• Apply the polish to an area slightly smaller than the area which you intend to polish. Using the appropriate polishing tool, work in the polish with either linear or circular movements and with moderate pressure.
• Do not allow the polish to dry out on the surface; this may damage the surface. Do not expose the surface which you intend to polish to direct sunlight.
• Clean the polishing tool regularly to ensure good polishing results. Wash the polishing tools with mild detergent and warm water; do not use thinning agents.

Maintenance and Service

Maintenance and Cleaning

• Pull the plug out of the socket before carrying out anywork on the power tool.
• To ensure safe and efficient operation, always keepthe power tool and the ventilation slots clean.
• In order to avoid safety hazards, if the power supply cordneeds to be replaced, this must be done by Bosch or by anafter-sales service centre that is authorised to repair Boschpower tools.

After-Sales Service and Application Service

• Our after-sales service responds to your questions concern-ing maintenance and repair of your product as well as spareparts. You can find explosion drawings and information onspare parts at: www.bosch-pt.comThe Bosch product use advice team will be happy to help youwith any questions about our products and their accessor-ies.
• In all correspondence and spare parts orders, please alwaysinclude the 10‑digit article number given on the nameplateof the product.

Great Britain

• Robert Bosch Ltd. (B.S.C.) P.O. Box 98 Broadwater Park North Orbital Road Denham Uxbridge UB 9 5HJ
• At www.bosch-pt.co.uk you can order spare parts or arrange the collection of a product in need of servicing or repair.
• Tel. Service: (0344) 7360109
• E-Mail: boschservicecentre@bosch.com.
• You can find further service addresses at:  www.bosch-pt.com/serviceaddresses.

Disposal
The power tool, accessories and packaging should be recycled in an environmentally friendly manner. Do not dispose of power tools along with household waste.

Only for EU countries

• According to the European Directive 2012/19/EU on Waste Electrical and Electronic Equipment and its implementation into national law, power tools that are no longer usable must be collected separately and disposed of in an environmentally friendly manner.
• If disposed incorrectly, waste electrical and electronic equipment may have harmful effects on the environment and human health, due to the potential presence of hazardous substances.

Only for United Kingdom
According to The Waste Electrical and Electronic Equipment Regulations 2013 (SI 2013/3113) (as amended), products that are no longer usable must be collected separately and disposed of in an environmentally friendly manner.

More Information

Accessories

CE

EU Declaration of Conformity We declare under our sole responsibility that the stated products comply with all applicable provisions of the directives and regulations listed below and are in conformity with the following standards. Technical file at: * Random orbit sander Article number

Declaration of Conformity

• Random orbit sander Article number
• GEX 34-150
• GEX 34-150
• 3 601 C72 860
• 3 601 C72 870

We declare under our sole responsibility that the stated products comply with all applicable provisions of the regulations listed below and are in conformity with the following standards. Technical file at: Robert Bosch Ltd. (PT/SOP-GB), Broadwater Park, North Orbital Road, Uxbridge UB9 5HJ, United Kingdom

Robert Bosch Power Tools GmbH

• 70538 Stuttgart
• GERMANY  www.bosch-pt.com.

References

• Invented for life | Bosch Global
• Početna strana | Bosch u Srbiji
• Skånevik Ølen Kraftlag AS
• Электроинструменты Bosch | Bosch Professional
• Location selection | Bosch Power Tools
• Електроинструменти на Bosch | Електроинструменти на Bosch
• Service worldwide
• Elektrické nářadí Bosch | Elektrické nářadí Bosch
• Bosch Elektrowerkzeuge und Zubehör | Bosch Elektrowerkzeuge
• Bosch el-værktøj | Bosch el-værktøj
• Bosch-sähkötyökalut | Bosch-sähkötyökalut
• Ηλεκτρικά εργαλεία Bosch | Ηλεκτρικά εργαλεία Bosch
• Bosch elektromos kéziszerszámok | Bosch elektromos kéziszerszámok
• Elektronarzędzia Bosch | Elektronarzędzia Bosch
• Scule electrice Bosch | Scule electrice Bosch
• Bosch električni alati | Bosch električni alati
• bosch-pt.ru
• Elektrické náradie Bosch | Elektrické náradie Bosch
• Invented for life | Bosch Global
• Ana Sayfa | Bosch Türkiye
• Početna | Bosch u Hrvatskoj
• Domov | Bosch v Sloveniji
• herramientasbosch.net

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