Makita DHR241 Cordless Combination Hammer Instruction Manual

: October 30, 2023
: Makita

Table of Contents

Makita DHR241 Cordless Combination Hammer
Product Information
Product Usage Instructions
Explanation of general view
SPECIFICATIONS
General Power Tool Safety Warnings
IMPORTANT SAFETY INSTRUCTIONS
FUNCTIONAL DESCRIPTION
Selecting the action mode
ASSEMBLY
OPERATION
MAINTENANCE
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Makita DHR241 Cordless Combination Hammer

Makita-DHR241-Cordless-Combination-Hammer-product

Product Information

GB Cordless Combination Hammer

The GB Cordless Combination Hammer is a versatile power tool designed for hammer drilling and drilling in brick, concrete, and stone. It is also suitable for chiseling work and drilling without impact in wood, metal, ceramic, and plastic. The tool features a red indicator, button, battery cartridge, star marking, switch trigger, reversing switch lever, lock button, rotation with hammering, action mode changing knob, rotation only, and hammering only. It also includes a grip base, side grip, loosen and tighten feature, teeth and protrusion for bit shank, bit grease, bit, chuck cover, O symbol, depth gauge, dust cup, blow-out bulb, chuck adapter, keyless drill chuck, sleeve, ring, limit mark, screwdriver, and brush holder cap.

Here are the specifications for the GB Cordless Combination Hammer:

Model: DHR241
Concrete Capacities: 20 mm
Steel Capacities: 13 mm
Wood Capacities: 26 mm
No Load Speed (min-1): 0 – 1,200
Blows Per Minute: 0 – 4,000
Overall Length: 417 mm
Net Weight: 3.5 kg
Rated Voltage: D.C. 18 V

Product Usage Instructions

Before using the GB Cordless Combination Hammer, it is important to read all safety warnings and instructions to prevent electric shock, fire and/or serious injury. The tool is equipped with an auxiliary handle, which should be used to prevent loss of control.
Ear protectors should also be worn to prevent hearing loss due to exposure to noise.

The GB Cordless Combination Hammer is designed for hammer drilling and drilling in brick, concrete, and stone. It is also suitable for chiseling work and drilling without impact in wood, metal, ceramic, and plastic. To use the tool, follow these steps:

Insert the battery cartridge into the tool.
Select the appropriate bit for your task and insert it into the chuck.
Adjust the depth gauge to ensure accurate drilling depth.
Select the desired action mode using the action mode changing knob. You can choose between rotation with hammering, rotation only, and hammering only.
Press the switch trigger to start the tool. Use the grip base and side grip to control the tool while in use.
After use, turn off the tool and wait for it to stop completely before setting it down.
Remove the battery cartridge from the tool and store it in a cool, dry place.

It is important not to touch the bit or parts close to the bit immediately after operation, as they may be extremely hot and could burn your skin. Additionally, some materials contain chemicals that may be toxic, so take caution to prevent dust inhalation and skin contact. Follow material supplier safety data.

Remember to save all warnings and instructions for future reference, and do not let comfort or familiarity with the product replace strict adherence to safety rules for the subject product. Misuse or failure to follow the safety rules stated in this instruction manual may cause serious personal injury.

Explanation of general view

Red indicator
Button
Battery cartridge
Star marking
Switch trigger
Reversing switch lever
Lock button
Rotation with hammering
Action mode changing knob
Rotation only
Hammering only
Grip base
Side grip
Loosen
Tighten
Teeth
Protrusion
Bit shank
Bit grease
Bit
Chuck cover
O symbol
Depth gauge
Dust cup
Blow-out bulb
Chuck adapter
Keyless drill chuck
Sleeve
Ring
Limit mark
Screwdriver
Brush holder cap

SPECIFICATIONS

Model	DHR241

Capacities

Due to our continuing programme of research and development, the specifications herein are subject to change without notice.
Specifications and battery cartridge may differ from country to country.
Weight, with battery cartridge, according to EPTA-Procedure 01/2003

Intended use
ENE043-1 The tool is intended for hammer drilling and drilling in brick, concrete and stone as well as for chiselling work. It is also suitable for drilling without impact in wood, metal, ceramic and plastic.

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.

CORDLESS ROTARY HAMMER SAFETY WARNINGS

Wear ear protectors. Exposure to noise can cause hearing loss.
Use auxiliary handle(s), if supplied with the tool. Loss of control can cause personal injury.
Hold power tool by insulated gripping surfaces, when performing an operation where the cutting accessory may contact hidden wiring. Cutting accessory contacting a “live” wire may make exposed metal parts of the power tool “live” and could give the operator an electric shock.
Wear a hard hat (safety helmet), safety glasses and/or face shield. Ordinary eye or sun glasses are NOT safety glasses. It is also highly recommended that you wear a dust mask and thickly padded gloves.
Be sure the bit is secured in place before operation.
Under normal operation, the tool is designed to produce vibration. The screws can come loose easily, causing a breakdown or accident. Check tightness of screws carefully before operation.
In cold weather or when the tool has not been used for a long time, let the tool warm up for a while by operating it under no load. This will loosen up the lubrication. Without proper warm-up, hammering operation is difficult.
Always be sure you have a firm footing.
Be sure no one is below when using the tool in high locations.
Hold the tool firmly with both hands.
Keep hands away from moving parts.
Do not leave the tool running. Operate the tool only when hand-held.
Do not point the tool at any one in the area when operating. The bit could fly out and injure someone seriously.
Do not touch the bit or parts close to the bit immediately after operation; they may be extremely hot and could burn your skin.
Some material contains chemicals which may be toxic. Take caution to prevent dust inhalation and skin contact. Follow material supplier safety data.

SAVE THESE INSTRUCTIONS.
WARNING:
DO NOT let comfort or familiarity with product (gained from repeated use) replace strict adherence to safety rules for the subject product. MISUSE or failure to follow the safety rules stated in this instruction manual may cause serious personal injury.

IMPORTANT SAFETY INSTRUCTIONS

FOR BATTERY CARTRIDGE

Before using battery cartridge, read all instructions and cautionary markings on (1) battery charger, (2) battery, and (3) product using battery.
Do not disassemble battery cartridge.
If operating time has become excessively shorter, stop operating immediately. It may result in a risk of overheating, possible burns and even an explosion.
If electrolyte gets into your eyes, rinse them out with clear water and seek medical attention right away. It may result in loss of your eyesight.
Do not short the battery cartridge:
Do not touch the terminals with any conductive material.
Avoid storing battery cartridge in a container with other metal objects such as nails, coins, etc.
Do not expose battery cartridge to water or rain.
A battery short can cause a large current flow, overheating, possible burns and even a breakdown.
Do not store the tool and battery cartridge in locations where the temperature may reach or exceed 50°C (122°F).
Do not incinerate the battery cartridge even if it is severely damaged or is completely worn out. The battery cartridge can explode in a fire.
Be careful not to drop or strike battery.
Do not use a damaged battery.

SAVE THESE INSTRUCTIONS.

Tips for maintaining maximum battery life

Charge the battery cartridge before completely discharged.
Always stop tool operation and charge the battery cartridge when you notice less tool power.
Never recharge a fully charged battery cartridge. Overcharging shortens the battery service life.
Charge the battery cartridge with room temperature at 10°C – 40°C (50°F – 104°F). Let a hot battery cartridge cool down before charging it.
Charge the battery cartridge once in every six months if you do not use it for a long period of time.

FUNCTIONAL DESCRIPTION

CAUTION:

Always be sure that the tool is switched off and the battery cartridge is removed before adjusting or checking function on the tool.

Installing or removing battery cartridge (Fig. 1)

Always switch off the tool before installing or removing of the battery cartridge.
To remove the battery cartridge, slide it from the tool while sliding the button on the front of the cartridge.
To install the battery cartridge, align the tongue on the battery cartridge with the groove in the housing and slip it into place. Always insert it all the way until it locks in place with a little click. If you can see the red indicator on the upper side of the button, it is not locked completely. Install it fully until the red indicator cannot be seen. If not, it may accidentally fall out of the tool, causing injury to you or someone around you.
Do not use force when installing the battery cartridge. If the cartridge does not slide in easily, it is not being inserted correctly.

Battery protection system (Lithium-ion battery with star marking) (Fig. 2) Lithium-ion batteries with a star marking are equipped with a protection system. This system automatically cuts off power to the tool to extend battery life.
The tool will automatically stop during operation if the tool and/or battery are placed under one of the following conditions:

Overloaded:
The tool is operated in a manner that causes it to draw an abnormally high current.
In this situation, release the trigger switch on the tool and stop the application that caused the tool to become overloaded. Then pull the trigger switch again to restart.
If the tool does not start, the battery is overheated. In this situation, let the battery cool before pulling the trigger switch again.
Low battery voltage:
The remaining battery capacity is too low and the tool will not operate. In this situation, remove and recharge the battery.

Switch action (Fig. 3) CAUTION:

Before inserting the battery cartridge into the tool, always check to see that the switch trigger actuates properly and returns to the “OFF” position when released.

To start the tool, simply pull the switch trigger. Tool speed is increased by increasing pressure on the switch trigger. Release the switch trigger to stop.

Reversing switch action (Fig. 4) This tool has a reversing switch to change the direction of rotation. Depress the reversing switch lever from the A side for clockwise rotation or from the B side for counterclockwise rotation.
When the reversing switch lever is in the neutral position, the switch trigger cannot be pulled.

CAUTION:

Always check the direction of rotation before operation.
Use the reversing switch only after the tool comes to a complete stop. Changing the direction of rotation before the tool stops may damage the tool.
When not operating the tool, always set the reversing switch lever to the neutral position.

Selecting the action mode

Rotation with hammering (Fig. 5) For drilling in concrete, masonry, etc., depress the lock button and rotate the action mode changing knob to the symbol. Use a tungsten-carbide tipped bit.

Rotation only (Fig. 6) For drilling in wood, metal or plastic materials, depress the lock button and rotate the action mode changing knob to the symbol. Use a twist drill bit or wood bit.

Hammering only (Fig. 7) For chipping, scaling or demolition operations, depress the lock button and rotate the action mode changing knob to the symbol. Use a bull point, cold chisel, scaling chisel, etc.

CAUTION:

Do not rotate the action mode changing knob when the tool is running. The tool will be damaged.
To avoid rapid wear on the mode change mechanism, be sure that the action mode changing knob is always positively located in one of the three action mode positions.

Torque limiter
The torque limiter will actuate when a certain torque level is reached. The motor will disengage from the output shaft. When this happens, the bit will stop turning.

CAUTION:

As soon as the torque limiter actuates, switch off the tool immediately. This will help prevent premature wear of the tool.
Hole saws cannot be used with this tool. They tend to pinch or catch easily in the hole. This will cause the torque limiter to actuate too frequently.

ASSEMBLY

CAUTION:

Always be sure that the tool is switched off and the battery cartridge is removed before carrying out any work on the tool.

Side grip (auxiliary handle) (Fig. 8) CAUTION:

Always use the side grip to ensure operating safety. Install the side grip so that the teeth on the grip fit in between the protrusions on the tool barrel. Then tighten the grip by turning clockwise at the desired position. It may be swung 360° so as to be secured at any position.

Bit grease
Coat the bit shank head beforehand with a small amount of bit grease (about 0.5 -1 g). This chuck lubrication assures smooth action and longer service life.

Installing or removing the bit

Clean the bit shank and apply bit grease before installing the bit. (Fig. 9)
Insert the bit into the tool. Turn the bit and push it in until it engages. (Fig. 10)
If the bit cannot be pushed in, remove the bit. Pull the chuck cover down a couple of times. Then insert the bit again. Turn the bit and push it in until it engages.
After installing, always make sure that the bit is securely held in place by trying to pull it out.
To remove the bit, pull the chuck cover down all the way and pull the bit out. (Fig. 11)

Bit angle (when chipping, scaling or demolishing) (Fig. 12) The bit can be secured at the desired angle. To change the bit angle, depress the lock button and rotate the action mode changing knob to the O symbol. Turn the bit to the desired angle.
Depress the lock button and rotate the action mode changing knob to the symbol. Then make sure that the bit is securely held in place by turning it slightly. (Fig. 13) ****

Depth gauge (Fig. 14) The depth gauge is convenient for drilling holes of uniform depth. Loosen the side grip and insert the depth gauge into the hole in the side grip. Adjust the depth gauge to the desired depth and tighten the side grip.
NOTE:

The depth gauge cannot be used at the position where the depth gauge strikes against the gear housing.

Dust cup (Fig. 15) Use the dust cup to prevent dust from falling over the tool and on yourself when performing overhead drilling operations. Attach the dust cup to the bit as shown in the figure. The size of bits which the dust cup can be attached to is as follows.

| Bit diameter
---|---
Dust cup 5| 6 mm – 14.5 mm
Dust cup 9| 12 mm – 16 mm

OPERATION

Hammer drilling operation (Fig. 16)

Set the action mode changing knob to the symbol.

Position the bit at the desired location for the hole, then pull the switch trigger.
Do not force the tool. Light pressure gives best results. Keep the tool in position and prevent it from slipping away from the hole.
Do not apply more pressure when the hole becomes clogged with chips or particles. Instead, run the tool at an idle, then remove the bit partially from the hole. By repeating this several times, the hole will be cleaned out and normal drilling may be resumed.

CAUTION:

There is a tremendous and sudden twisting force exerted on the tool/bit at the time of hole break-through, when the hole becomes clogged with chips and particles, or when striking reinforcing rods embedded in the concrete. Always use the side grip (auxiliary handle) and firmly hold the tool by both side grip and switch handle during operations. Failure to do so may result in the loss of control of the tool and potentially severe injury.

NOTE:
Eccentricity in the bit rotation may occur while operating the tool with no load. The tool automatically centers itself during operation. This does not affect the drilling precision.

Blow-out bulb (optional accessory) (Fig. 17) After drilling the hole, use the blow-out bulb to clean the dust out of the hole.

Chipping/Scaling/Demolition (Fig. 18)

Set the action mode changing knob to the symbol.
Hold the tool firmly with both hands. Turn the tool on and apply slight pressure on the tool so that the tool will not bounce around, uncontrolled. Pressing very hard on the tool will not increase the efficiency.

Drilling in wood or metal (Fig. 19 & 20) Use the optional drill chuck assembly. When installing it, refer to “Installing or removing the bit” described on the previous page. Set the action mode changing knob so that the pointer points to the symbol.
CAUTION:

Never use “rotation with hammering” when the drill chuck assembly is installed on the tool. The drill chuck assembly may be damaged. Also, the drill chuck will come off when reversing the tool.
Pressing excessively on the tool will not speed up the drilling. In fact, this excessive pressure will only serve to damage the tip of your bit, decrease the tool performance and shorten the service life of the tool.
There is a tremendous twisting force exerted on the tool/bit at the time of hole breakthrough. Hold the tool firmly and exert care when the bit begins to break through the workpiece.
A stuck bit can be removed simply by setting the reversing switch to reverse rotation in order to back out. However, the tool may back out abruptly if you do not hold it firmly.
Always secure small workpieces in a vise or similar hold-down device.

MAINTENANCE

CAUTION:

Always be sure that the tool is switched off and the battery cartridge is removed before attempting to perform inspection or maintenance.
Never use gasoline, benzine, thinner, alcohol or the like. Discoloration, deformation or cracks may result.

Replacing carbon brushes (Fig. 21) Remove and check the carbon brushes regularly. Replace when they wear down to the limit mark. Keep the carbon brushes clean and free to slip in the holders. Both carbon brushes should be replaced at the same time. Use only identical carbon brushes.
Use a screwdriver to remove the brush holder caps. Take out the worn carbon brushes, insert the new ones and secure the brush holder caps. (Fig. 22) To maintain product SAFETY and RELIABILITY, repairs, any other maintenance or adjustment should be performed by Makita Authorized Service Centers, always using Makita replacement parts.

OPTIONAL ACCESSORIES

CAUTION:

These accessories or attachments are recommended for use with your Makita tool specified in this manual. The use of any other accessories or attachments might present a risk of injury to persons. Only use accessory or attachment for its stated purpose.

If you need any assistance for more details regarding these accessories, ask your local Makita Service Center.

SDS-Plus Carbide-tipped bits
Bull point
Cold chisel
Scaling chisel
Grooving chisel
Drill chuck assembly
Drill chuck S13
Chuck adapter
Chuck key S13
Bit grease
Side grip
Depth gauge
Blow-out bulb
Dust cup
Dust extractor attachment
Safety goggles
Plastic carrying case
Keyless drill chuck
Various type of Makita genuine batteries and chargers
NOTE: Some items in the list may be included in the tool package as standard accessories. They may differ from country to country.

Noise

The typical A-weighted noise level determined according to EN60745:

Sound pressure level (LpA): 86 dB (A)
Sound power level (LWA): 97 dB (A)
Uncertainty (K): 3 dB (A)

Wear ear protection.

Vibration

The vibration total value (tri-axial vector sum) determined according to EN60745:

Work mode: hammer drilling into concrete
Vibration emission (ah,HD): 12.5 m/s2
Uncertainty (K): 1.5 m/s2
Work mode: chiselling
Vibration emission (ah,CHeq): 9.5 m/s2
Uncertainty (K): 1.5 m/s2
Work mode: drilling into metal
Vibration emission (ah,D): 2.5 m/s2 or less Uncertainty (K): 1.5 m/s2
The declared vibration emission value has been measured in accordance with the standard test method and may be used for comparing one tool with another.
The declared vibration emission value may also be used in a preliminary assessment of exposure.
WARNING: The vibration emission during actual use of the power tool can differ from the declared emission value depending on the ways in which the tool is used.
Be sure to identify safety measures to protect the operator that are based on an estimation of exposure in the actual conditions of use (taking account of all parts of the operating cycle such as the times when the tool is switched off and when it is running idle in addition to the trigger time).