Makita DHR242 / DHR243 Cordless Combination Hammer Instruction Manual

Introduction

This document provides instruction manual for Makita Cordless Combination Hammers, models DHR242 and DHR243.

It covers operation, safety precautions, technical specifications, and maintenance.

Technical Data

Note: Technical data is subject to change without notice due to continuous research and development. Specifications and battery pack may differ in various countries.

Weight with battery pack according to EPTA - Procedure 01/2003.

Intended Use

The tool is intended for hammer drilling and rotary drilling into brick, concrete, and stone, as well as for chiseling.

It is also suitable for rotary drilling without hammer action into wood, metal, ceramic materials, and plastics.

Noise and Vibration

Typical weighted sound pressure level (LPA) and sound power level (LWA) are provided according to EN60745 standards. Users are advised to wear hearing protection.

Vibration emission values (ah,HD, ah,Cheq, ah,D) for different operating modes (hammer drilling into concrete, chiseling, drilling into metal) are listed for both models, along with uncertainty (K).

The declared vibration emission value has been measured in accordance with a standard test method and may be used for comparison. It can also be used for preliminary exposure assessment.

WARNING: Vibration emissions during actual use may differ from the declared value depending on the usage method. Ensure appropriate safety measures are in place based on estimated exposure during actual conditions.

General Safety Warnings for Power Tools

Read all safety warnings and instructions. Failure to follow warnings may result in electric shock, fire, or serious injury.

Keep warnings and instructions for future reference.

Specific Safety Warnings for Cordless Hammer Drills

• Wear hearing protection.
• Use the auxiliary handle if supplied. Loss of control can cause personal injury.
• When performing an operation where the accessory may contact hidden wiring or its own cord, hold the power tool by the insulated gripping surfaces. Contact with a live wire will make exposed metal parts of the tool live and could give the operator an electric shock.
• Wear appropriate head protection (safety helmet), eye protection (safety glasses or face shield). Ordinary eyeglasses are not safety glasses. Consider a dust mask and heavy-duty gloves.
• Ensure the working tool is securely mounted before operation.
• Vibrations during normal operation may cause screws to loosen. Check screw tightness before use.
• For cold weather or if the tool has not been used for a long time, warm up the tool by running it without load for a short period to warm up the lubricant.
• Ensure stable footing and balance. Do not overreach.
• Hold the tool firmly with both hands.
• Keep hands away from moving parts.
• Do not leave the tool running unattended.
• Do not aim the tool at any person. The working tool may become loose and cause serious injury.
• Do not touch the tool or accessory immediately after operation; they may be very hot and cause burns.
• Be aware that some materials contain chemicals that may be poisonous. Prevent inhalation or contact.

WARNING: Do not let familiarity gained from frequent use override safety rules. Improper use or failure to follow safety rules may cause serious injury.

SAVE THESE INSTRUCTIONS.

Battery Safety

• Read all instructions and warning markings on the charger, battery, and product.
• Do not disassemble the battery.
• If the operating time is significantly reduced, stop using the battery immediately. This may indicate overheating, burns, or explosion.
• If electrolyte gets into your eyes, flush them with clean water and seek immediate medical attention.
• Do not short-circuit the battery:
  • Do not touch terminals with conductive material.
  • Do not store the battery in a container with other metal objects like nails or coins.
  • Do not expose the battery to water or rain.
• Do not store the tool and battery in locations where the temperature may exceed 50°C (122°F).
• Do not incinerate the battery even if it is severely damaged or completely worn out. The battery may explode in a fire.
• Do not drop or strike the battery.
• Do not use a damaged battery.

SAVE THESE INSTRUCTIONS.

Tips for Maximizing Battery Life

• Charge the battery before it is completely depleted.
• If tool performance decreases, stop operation and recharge the battery.
• Never recharge a fully charged battery; overcharging shortens battery life.
• Charge the battery at room temperature between 10°C and 40°C (50°F - 104°F).
• Allow a hot battery to cool down before charging.
• If the tool is not used for an extended period, recharge the battery pack once every six months.

Function Description

CAUTION: Always ensure the tool is switched off and the battery is disconnected before making any adjustments or checking function.

Installing and Removing the Battery Pack

CAUTION: Hold the tool and the battery pack firmly when installing or removing. Failure to do so may cause the tool or battery pack to slip from your hands and result in damage or injury.

Fig.1: Illustrates the process of installing and removing the battery pack. Ensure the tool is off before removing the battery. To remove, slide the battery pack while pressing the release button on the front. To install, align the battery pack with the groove in the housing and slide it in until it clicks. A red indicator on the top of the battery may be visible if not fully seated.

Battery Protection System

Fig.2: Lithium-ion batteries with a star mark are equipped with a protection system. This system automatically cuts off power to the tool to extend battery life. The tool will automatically shut off during operation if it is subjected to overload, low voltage, or overheating. If the tool stops, release the trigger and allow the battery to cool down before restarting.

Switch Action

Fig.3: Before inserting the battery, check that the trigger operates correctly and returns to the OFF position when released. To start the tool, press the trigger. The speed of the tool increases as the trigger is squeezed further. To stop the tool, release the trigger.

Changing Rotation Direction

Fig.4: The tool features a rotation direction change lever. Pressing the lever to position 'A' rotates the tool clockwise, while pressing to position 'B' rotates it counter-clockwise. The lever must be in the neutral position for the trigger to operate. CAUTION: Always check the set rotation direction before operation. Do not change the rotation direction while the tool is in motion. When not in use, always set the lever to the neutral position.

Replacing the SDS-plus Quick-Change Chuck (for DHR243)

Fig.5: The SDS-plus quick-change chuck can be easily replaced with a standard drill chuck. CAUTION: Remove the working tool before installing the SDS-plus chuck. Grip the rotating sleeve of the SDS-plus chuck and turn it in the direction of the arrow until the mark on the sleeve aligns with the symbol. Pull firmly in the direction of the arrow to remove.

Fig.6: To install, align the mark on the quick-change chuck with the symbol. Grip the rotating sleeve and align the mark with the symbol. Slide the quick-change chuck onto the tool spindle. Grip the rotating sleeve and align the mark on the sleeve with the symbol. The correct position is indicated by a click.

Selecting the Operating Mode

Hammer Drilling

Fig.7: For drilling into concrete, masonry, and similar materials, press the lock button and turn the mode selector to the hammer drilling symbol (often depicted as a hammer or 'T'). Use a carbide-tipped bit.

Rotary Only

Fig.8: For drilling into wood, metal, or plastic, press the lock button and turn the mode selector to the rotary-only symbol (often depicted as a drill bit or 'O'). Use a twist drill bit or wood bit.

Chisel Only

Fig.9: For chiseling, hammering, or demolition, press the lock button and turn the mode selector to the chisel-only symbol (often depicted as a chisel or 'T' with a hammer). Use a pointed bit, flat chisel, or bull point.

CAUTION: Do not turn the mode selector while the tool is under load. This can damage the tool. To prevent premature wear of the mode changing mechanism, ensure the mode selector knob is always set firmly in one of the three operating modes. If the mode selector is difficult to turn between symbols, briefly turn the tool on or rotate the chuck by hand in the direction of the symbol before turning the mode selector. Forcing the mode selector can damage the tool.

Torque Limiter

The torque limiter activates when a certain torque level is reached, disconnecting the motor from the output shaft. If this occurs, the working tool stops.

CAUTION: Immediately switch off the tool when the torque limiter activates to prevent premature wear. Hole saws cannot be used with this tool as they tend to bind or catch, causing frequent activation of the torque limiter.

Assembly

CAUTION: Always ensure the tool is switched off and the battery is disconnected before performing any work on the tool.

Side Handle (Auxiliary Handle)

Fig.10: CAUTION: Always use the side handle for safe operation. Mount the side handle by aligning the projection on the handle with the grooves on the tool housing. Tighten the handle by turning it clockwise to the desired position. The handle can be rotated 360° and locked in any position.

Greasing the Tool Bit

Before use, apply a small amount of grease (approx. 0.5 - 1 g) to the shank of the tool bit. This lubricates the chuck for smooth operation and longer service life.

Installing and Removing the Working Tool

Clean the tool bit shank and apply grease before installation.

Fig.11: Insert the working tool into the tool holder. Rotate the tool bit and push it in until it is secured.

Fig.12: If the working tool cannot be inserted, remove it. Pull the chuck cover down several times. Then re-insert the tool bit. Rotate the tool bit and push it in until it is secured. After installation, always try to pull the tool bit to ensure it is securely held. To remove the tool bit, pull the chuck cover down completely and pull out the working tool.

Fig.13: Shows the tool bit angle adjustment.

Fig.14: The working tool can be locked at a desired angle. To change the angle, press the lock button and turn the mode selector to the 'O' symbol. Rotate the working tool to the desired angle. Press the lock button and turn the mode selector to the symbol. Then, by turning slightly, ensure the working tool is securely held.

Fig.15: Depth gauge.

Fig.16: The depth gauge is a useful accessory for drilling holes of the same depth. Loosen the side handle and insert the depth gauge into the hole on it. Set the depth gauge to the desired depth and tighten the side handle.

NOTE: The depth stop cannot be used in a position where it interferes with the gear housing.

Anti-Dust Cover

Fig.17: The anti-dust cover serves to prevent dust from falling onto the tool and operator when drilling overhead. Install the anti-dust cover as illustrated. The size of working tools for which the anti-dust cover can be used is as follows:

Work

Hammer Drilling

Fig.18: Set the mode selector to the hammer drilling symbol. Position the working tool at the desired hole location and press the trigger. Do not apply excessive force to the tool. Best results are achieved with moderate pressure. Keep the tool in the current position and be careful not to let it slip out of the hole. If the hole becomes clogged with chips or debris, do not apply more pressure. Instead, run the tool at no load and partially withdraw the working tool from the hole. Repeating this procedure several times will clear the hole, allowing you to continue drilling.

CAUTION: When the drill bit enters the material, immense and sudden torsional forces act on the tool and bit, especially if the hole becomes clogged with chips and debris or if it hits reinforcing bars embedded in concrete. Always use the side handle (auxiliary handle) and hold the tool firmly by the side handle and the switch handle during operation. Failure to do so may result in loss of control and potentially serious injury.

NOTE: When starting the tool without load, the working tool may run eccentrically. The tool will self-center during operation. This condition does not affect drilling accuracy.

Blow-Out Nozzle (Optional Accessory)

Fig.19: After drilling a hole, use the blow-out nozzle to remove dust from the hole.

Chiseling / Hammering / Demolition

Fig.20: Set the mode selector to the chisel-only symbol. Hold the tool firmly with both hands. Start the tool and apply moderate pressure to prevent the tool from recoiling uncontrollably. Applying excessive pressure to the tool will not increase its efficiency.

Drilling into Wood and Metal

Fig.21, Fig.22: Use the optional chuck assembly. Follow the instructions in the "Installing and Removing the Working Tool" section for installing the chuck. Set the mode selector so the indicator points to the rotary-only symbol.

For Model DHR243:

CAUTION: If a chuck assembly is mounted on the tool, never use the "hammer drilling" mode. This could damage the chuck assembly. The chuck will also loosen when the tool's rotation direction is changed.

Fig.23: Warning related to chuck assembly.

Fig.24: Use the quick-change chuck as standard equipment. Follow the instructions in the "Replacing the SDS-plus Quick-Change Chuck" section for installation.

Fig.25: Hold the ring and turn the sleeve counter-clockwise to open the chuck jaws. Insert the drill bit as far as possible into the chuck. Hold the ring firmly and tighten the chuck by turning the sleeve clockwise. To remove the drill bit, hold the ring and turn the sleeve counter-clockwise.

Set the mode selector to the rotary-only symbol. Holes up to a maximum diameter of 13 mm can be drilled into metal, and up to 32 mm into wood.

CAUTION: If a quick-change chuck is mounted on the tool, never use the "hammer drilling" mode. This could damage the quick-change chuck. The chuck will also loosen when the tool's rotation direction is changed.

Applying excessive pressure to the tool will not speed up drilling. In fact, this excessive pressure only leads to damage of your drill bit tip, reduced tool efficiency, and shortened tool life.

When the drill bit enters the material, immense forces act on the tool and bit. Hold the tool firmly and be careful as the drill bit begins to penetrate the workpiece.

A stuck drill bit can be easily freed by switching the rotation direction switch to the opposite position. However, if the tool is not held firmly, it may jump out unexpectedly.

Always clamp small parts in a vise or similar holding device.

Maintenance

CAUTION: Always ensure the tool is switched off and the battery is disconnected before performing any inspection or maintenance.

• Never use gasoline, benzine, thinner, alcohol, or similar agents. These can cause discoloration, deformation, or cracking.
• To maintain product SAFETY and RELIABILITY, repairs, carbon brush checks, and all other maintenance or adjustments should be performed by Makita authorized service centers with Makita replacement parts.

Optional Accessories

CAUTION: For your Makita tool described in this manual, the use of this accessory and attachments is recommended. Using other accessories or attachments may pose a risk of personal injury. Accessories and attachments should only be used for their intended purposes. For more information on these accessories, please contact your local Makita service center.

• SDS-plus carbide-tipped bits
• Pointed bit
• Flat chisel
• Grooving chisel
• Chuck assembly
• S13 chuck
• Chuck adapter
• S13 chuck wrench
• Tool grease
• Side handle
• Depth gauge
• Blow-out nozzle
• Anti-dust cover
• Removable dust extractor
• Safety glasses
• Plastic tool case
• Keyless drill chuck
• Various types of genuine Makita batteries and chargers

NOTE: Some items in the list may be included as standard accessories with the equipment. Included accessories may vary by country.