MRH 900 - Hammer Maestro - Free user manual and instructions

Product Type	Hammer Drill
Brand	Maestro
Model	MRH 900
Mains Voltage	230 V ~ 50 Hz
Power Input	900 W
Idling Speed	850 rpm
Blow Rate	4100 rpm
Drilling Capacity (Concrete/Stone)	26 mm
Protection Class	II
Weight	4.3 kg
Sound Pressure Level	92.7 dB(A)
Sound Power Level	103.7 dB(A)
Vibration Emission (Hammer Drilling)	21.401 m/s²
Vibration Emission (Chiseling)	20.145 m/s²
Additional Handle	Yes (adjustable)
Depth Stop	Included
Dust Collection Device	Included
Tool Mounting System	SDS (locking sleeve)
Functions	Drilling, hammer drilling, chiseling with rotation stop
Guarantee Period	2 years

Frequently Asked Questions - MRH 900 Maestro

How do I insert a drill bit into the MRH 900?

Clean the bit and apply grease to the shaft. Pull back and hold the locking sleeve, insert the tool while turning until it locks, then release the sleeve. Check security by pulling.

How do I remove a drill bit?

Pull back and hold the locking sleeve, then remove the tool.

What is the proper use of this hammer drill?

Designed for drilling with hammer action in concrete, rock, and brick, and for chiseling work. Use only appropriate bits.

How do I switch off the hammer function?

Turn the rotary switch for hammer stop facility (5) to position (B) to disable hammering for gentle initial drilling. Turn back to (A) to reactivate.

How do I use the rotation stop for chiseling?

Press button (C) on the rotary switch (3) and turn to position A to stop rotation. For normal drilling, press and turn to position B.

What safety precautions should I take?

Wear ear-muffs, breathing mask, and safety goggles. Avoid working on asbestos. Read all safety regulations.

How do I clean and maintain the tool?

Always unplug before cleaning. Wipe with a clean cloth or low-pressure compressed air. Use a damp cloth with soft soap; avoid solvents. Check carbon brushes if excessive sparking occurs.

What should I do if the power cable is damaged?

The cable must be replaced by the manufacturer, aftersales service, or similarly trained personnel to avoid danger.

How do I adjust the additional handle?

Turn the handle anticlockwise to release the clamp, swing it to a comfortable position, then tighten by turning clockwise.

What is the warranty coverage?

The guarantee covers material and manufacturing defects for 2 years from purchase. Excludes commercial use, transport damage, misuse, and normal wear. Send defective device postage-free with proof of purchase.

USER MANUAL MRH 900 Maestro

Select between the individual functions only when the equipment is at a standstill. If you fail to observe this point, the equipment may be damaged.

Um eine Beschädigung des Gerätes zu vermeiden, soll die Umschaltung zwischen den einzelnen Funktionen nur im Stillstand erfolgen.
Pentru a evita deteriorarea aparatului, comutarea funcților trebuie să se efectueze în stare de repaus.
③ Makinenin hasar görmesini önlemek için kinci delici fonksiyonları sadece matkap dururken değiştirilecektir.

Close-up of a mechanical tool with a cylindrical component and a curved arrow indicating rotation (no text or symbols visible)

Close-up of a drill bit being cut with motion arrows, labeled '2' (no text or symbols on the drill bit itself)

Diagram showing a drill bit and drill bit with directional arrows indicating movement (no text or symbols)

Close-up of a drill bit with a head labeled 'a' (no text or symbols beyond label)

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"Caution - Read the operating instructions to reduce the risk of inquiry"

Wear ear-muffs.

The impact of noise can cause damage to hearing.

Wear a breathing mask.

Dust which is injurious to health can be generated when working on wood and other materials. Never use the device to work on any materials containing asbestos!

Wear safety goggles.

Sparks generated during working or splinters, chips and dust emitted by the device can cause loss of sight.

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⚠️ Important!

When using equipment, a few safety precautions must be observed to avoid injuries and damage. Please read the complete operating manual with due care. Keep this manual in a safe place, so that the information is available at all times. If you give the equipment to any other person, give them these operating instructions as well.

We accept no liability for damage or accidents which arise due to non-observance of these instructions and the safety information.

1. Safety regulations

The corresponding safety information can be found in the enclosed booklet.

CAUTION!

Read all safety regulations and instructions.

Any errors made in following the safety regulations and instructions may result in an electric shock, fire and/or serious injury.

Keep all safety regulations and instructions in a safe place for future use.

2. Layout (Fig. 1)

1. Dust guard
2. Locking sleeve
3. Rotary switch for rotation stop facility
4. ON/OFF switch
5. Rotary switch for hammer stop facility
6. Additional handle
7. Depth stop
8. Handle

3. Proper use

The tool is designed for drilling with hammer action in concrete, rock and brick, as well as for chiseling work, always using the respective correct drill or chisel bit.

The equipment is to be used only for its prescribed purpose. Any other use is deemed to be a case of misuse. The user / operator and not the manufacturer will be liable for any damage or injuries of any kind caused as a result of this.

Please note that our equipment has not been designed for use in commercial, trade or industrial applications. Our warranty will be voided if the machine is used in commercial, trade or industrial businesses or for equivalent purposes.

1. Technical data

Mains voltage:	230 V ~ 50 Hz
Power input:	900 W
Idling speed:	850 rpm
Blow rate:	4100 rpm
Drilling capacity in concrete/stone (max.):	26 mm
Protection class:	II / ☑
Weight:	4.3 kg

Sound and vibration

Sound and vibration values were measured in accordance with EN 60745.

L_pA sound pressure level	92.7 dB(A)
K_pA uncertainty	3 dB
LWA sound power level	103.7 dB(A)
KWA uncertainty	3 dB

The hammer drill is not designed for outdoors use as specified I Article 3 of Directive 2000/14/EC_2005/88/EC.

Wear ear-muffs.

The impact of noise can cause damage to hearing.

Total vibration values (vector sum of three directions) determined in accordance with EN 60745.

Hammer drilling in concrete

Vibration emission value a_h = 22.401 ~m / s^2

K uncertainty = 1.5 m/s ^2

Chiseling

Vibration emission value a_h = 20.145 ~m / s^2

K uncertainty = 1.5 m/s ^2

Additional information for electric power tools

Warning!

The specified vibration value was established in accordance with a standardized testing method. It may change according to how the electric equipment is used and may exceed the specified value in exceptional circumstances.

The specified vibration value can be used to compare the equipment with other electric power tools.

The specified vibration value can be used for initial assessment of a harmful effect

Keep the noise emissions and vibrations to a minimum.

• Only use appliances which are in perfect working order.
  • Service and clean the appliance regularly.
  • Adapt your working style to suit the appliance.
• Do not overload the appliance.
  • Have the appliance serviced whenever necessary.
• Switch the appliance off when it is not in use.
• Wear protective gloves.

Residual risks

Even if you use this electric power tool in accordance with instructions, certain residual risks cannot be rules out. The following hazards may arise in connection with the equipment's construction and layout:

1. Lung damage if no suitable protective dust is used.

2. Damage to hearing if no suitable ear protection used.

3. Health damage caused by hand-arm vibrations the equipment is used over a prolonged period is not properly guided and maintained.

5. Before starting the equipment

Before you connect the equipment to the mains supply make sure that the data on the rating plate are identical to the mains data.

Always pull the power plug before making adjustments to the equipment.

Check the drilling point for concealed electrical cables, gas and water pipes using a cable/pipe detector.

5.1 Additional handle (Fig. 2 – Item 6) For safety reasons you must only use the hammer drill with the additional handle.

The additional handle (6) enables you to achieve better stability whilst using the hammer drill. The machine must not be used without the additional handle (6) for safety reasons.

The additional handle (6) is secured to the hammer drill by a clamp. Turning the handle anti-clockwise

(looking from the handle) will release the clamp. Turning the handle clockwise will tighten the clamp. First release the additional handle clamp. You can then swing the additional handle (6) into the most comfortable working position for you. Now turn the additional handle in the opposite direction again until the additional handle is secure.

5.2 Depth stop (Fig. 3 - Item 7)

The depth stop (7) is held in place by the additional handle (6) by clamping. The clamp can be released and tightened by turning the handle.

• Release the clamp and fit the depth stop (7) in the sequence provided for it in the additional handle.
• Set the depth stop (7) to the same level as the drill bit.

- Pull the depth stop back by the required drilling depth.

- Turn the handle on the additional handle (6) until it is secure.

- Now drill the hole until the depth stop (7) touches the workpiece.

5.3. Tool insertion (Fig. 4)

• Clean the tool before insertion and apply a thin
  coating of drill bit grease to the shaft of the tool.
• Pull back and hold the locking sleeve (2).
• Insert the dust-free tool into the tool mounting as far as it will go whilst turning it. The tool will lock itself.

- Check that it is properly secure by pulling the tool.

5.4 Tool removal (Fig. 5)

Pull back and hold the locking sleeve (2) and remove the tool.

5.5 Dust collection device (Fig. 6)

Slide the dust collection device (a) over the drill bit before carrying out any hammer drilling vertically above your head.

6. Starting up

△Important.

To prevent all danger, the machine must only be held using the two handles (6/8). Otherwise there may be a risk of suffering an electric shock if you drill into cables.

6.1 Switching on and off (Fig. 1)

To switch on: Press the control switch (4).

To switch off:

Release the control switch (4).

6.2 Hammer stop facility (Fig. 7)

The hammer drill has a hammer stop facility for gentle initial drilling.

- Turn the rotary switch for the hammer stop facility (5) to position (B) to switch off the

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hammer facility. 8.3 Maintenance

• To switch on the hammer facility again the rotary switch for the hammer stop facility (5) must be turned back to position (A).

There are no parts inside the equipment which require additional maintenance.

8.4 Ordering replacement parts:

6.3 Rotation stop facility (Fig. 8 / 9) Please quote the following data when ordering

The rotation function of the hammer drill can be replacement parts:

switched off for chiseling jobs.

- To do this, press the button (C) on the rotary switch (3) whilst at the same time turning the rotary switch (3) into position A (see Fig. 8).

- To switch on the rotation facility again, press button (C) on the rotary switch (3) whilst at the same time turning the rotary switch (3) into position B (see Fig. 9).

△ Important.

Please note that it is not possible to operate the hammer drill with the hammer stop and rotation stop facilities both active at the same time.

△ Important.

Only low pressure is required for hammer drilling. Excessive pressure will exert an unnecessary force on the motor. Check the drill bits at regular intervals. Sharpen or replace blunt drill bits.

- Type of machine

• Article number of the machine

• Identification number of the machine

• Replacement part number of the part required

For our latest prices and information please go to www.isc-gmbh.info

9. Disposal and recycling

The unit is supplied in packaging to prevent its being damaged in transit. This packaging is raw material and can therefore be reused or can be returned to the raw material system.

The unit and its accessories are made of various types of material, such as metal and plastic. Defective components must be disposed of as special waste. Ask your dealer or your local coun

7. Replacing the power cable

If the power cable for this equipment is damaged, it must be replaced by the manufacturer or its aftersales service or similarly trained personnel to avoid danger.

8. Cleaning, maintenance and

ordering of spare parts

Always pull out the mains power plug before starting any cleaning work.

8.1 Cleaning

- Keep all safety devices, air vents and the motor housing free of dirt and dust as far as possible. Wipe the equipment with a clean cloth or blow it with compressed air at low pressure.

• We recommend that you clean the device immediately each time you have finished using it.

- Clean the equipment regularly with a moist cloth and some soft soap. Do not use cleaning agents or solvents; these could attack the plastic parts of the equipment. Ensure that no water can seep into the device.

8.2 Carbon brushes

In case of excessive sparking, have the carbon brushes checked only by a qualified electrician. Important! The carbon brushes should not be replaced by anyone but a qualified electrician.

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Bohrhammer MRH 900 (Maestro)

□ 87/404/EC_2009/105/EC
2005/32/EC_2009/125/EC
2006/95/EC
2006/28/EC
2004/108/EC
2004/22/EC
□ 1999/5/EC
□ 97/23/EC
□ 90/396/EC_2009/142/EC
89/686/EC_96/58/EC

2006/42/EC
□ Annex IV Notified Body: Notified Body No.: Reg. No.:
□ Annex V
Annex VI
2004/26/EC
Emission No.:

2000/14/EC_2005/88/EC

Noise: measured L_WA = dB (A); guaranteed L_SS = dB (A) P = KW; UO = cm Nirrited Body

Standard references: EN 60745-1; EN 60745-2-6; EN 55014-1; EN 55014-2; EN 61000-3-2; EN 61000-3-3

Subject to change without notice

Archive-File/Record: 4258205-47-4155050-08

Documents registrar: Georg Riadel

Wiesenweg 22, D-94405 Landauilsar

GB GUARANTEE CERTIFICATE

Dear Customer,

In the unlikely event that your device develops a fault, we are truly sorry for this, and suggest that you please contact our service department at the address shown on this guarantee card, or contact the nearest authorised DIY store. Please note the following terms, under which guarantee claims can be made:

1. These guarantee terms cover additional guarantee rights and do not affect your statutory warranty rights. We do not charge you for this guarantee.
2. Our guarantee only covers problems caused by material or manufacturing defects, and it is restricted to the rectification of these defects or replacement of the device. Please note that our devices have not been designed for use in commercial, trade or industrial applications. Consequently, the guarantee is invalidated if the equipment is used in commercial, trade or industrial applications or for other equivalent activities. The following are also excluded from our guarantee: compensation for transport damage, damage caused by failure to comply with the installation/assembly instructions or damage caused by unprofessional installation, failure to comply with the operating instructions (e.g. connection to the wrong mains voltage or current type), misuse or inappropriate use (such as overloading of the device or use of non-approved tools or accessories), failure to comply with the maintenance and safety regulations, ingress of foreign bodies into the device (e.g. sand, stones or dust), effects of force or external influences (e.g. damage caused by the device being dropped) and normal wear resulting from proper operation of the device. This applies in particular to rechargeable batteries for which we nevertheless issue a guarantee period of 12 months.

The guarantee is rendered null and void if any attempt is made to tamper with the device.

1. The guarantee is valid for a period of 2 years starting from the purchase date of the device. Guarantee claims should be submitted before the end of the guarantee period within two weeks of the defect being noticed. No guarantee claims will be accepted after the end of the guarantee period. The original guarantee period remains applicable to the device even if repairs are carried out or parts are replaced. In such cases, the work performed or parts fitted will not result in an extension of the guarantee period, and no new guarantee will become active for the work performed or parts fitted. This also applies when an on-site service is used.

2. In order to assert your guarantee claim, please send your defective device postage-free to the address shown below, or contact the nearest authorised DIY store. Please enclose either the original or a copy of your sales receipt or another dated proof of purchase. Please keep your sales receipt in a safe place, as it is your proof of purchase. It would help us if you could describe the nature of the problem in as much detail as possible. If the defect is covered by our guarantee then your device will either be repaired immediately and returned to you, or we will send you a new device.

© GARANTIEURKUNDE

For EU countries only

Never place any electric tools in your household refuse.

To comply with European Directive 2002/96/EC concerning old electric and electronic equipment and its implementation in national laws, old electric tools have to be separated from other waste and disposed of in an environment-friendly fashion, e.g. by taking to a recycling depot.

Recycling alternative to the demand to return electrical devices:

As an alternative to returning the electrical device, the owner is obliged to cooperate in ensuring that the device is properly recycled if ownership is relinquished. This can also be done by handing over the used device to a returns center, which will dispose of it in accordance with national commercial and industrial waste management legislation. This does not apply to the accessories and auxiliary equipment without any electrical components which are included with the used device.

① Nur für EU-Länder

The reprinting or reproduction by any other means, in whole or in part, of documentation and papers accompanying products is permitted only with the express consent of ISC GmbH.

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