makita DHR243 Cordless Combination Hammer Instruction Manual

: June 3, 2024
: Makita

Table of Contents

DHR243 Cordless Combination Hammer
SPECIFICATIONS
IMPORTANT SAFETY INSTRUCTIONS
FUNCTIONAL DESCRIPTION
ASSEMBLY
OPERATION
MAINTENANCE
OPTIONAL ACCESSORIES
References
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Cordless Combination Hammer
INSTRUCTION MANUAL

DHR243 Cordless Combination Hammer

makita DHR243 Cordless Combination Hammer

makita DHR243 Cordless Combination Hammer - Fig 1

makita DHR243 Cordless Combination Hammer - Fig 2

makita DHR243 Cordless Combination Hammer - Fig 3

Explanation of general view

1-1. Red indicator
1-2. Button
1-3. Battery cartridge
2-1. Star marking
3-1. Switch trigger
4-1. Reversing switch lever
5-1. Quick change chuck for SDS-plus
5-2. Change cover line
5-3. Change cover
6-1. Spindle
6-2. Quick change drill chuck
6-3. Change cover
6-4. Change cover line
7-1. Rotation with hammering
7-2. Lock button
7-3. Action mode changing knob
8-1. Rotation only| 9-1. Hammering only
10-1. Protrusion
10-2. Groove
10-3. Loosen
10-4. Tighten
10-5. Side grip
11-1. Bit shank
11-2. Bit grease
12-1. Bit
12-2. Chuck cover
13-1. Bit
13-2. Chuck cover
14-1. Action mode changing knob
14-2. O symbol
16-1. Hole
16-2. Depth gauge
16-3. Loosen| 16-4. Tighten
17-1. Dust cup
19-1. Blow-out bulb
21-1. Chuck adapter
21-2. Keyless drill chuck
22-1. Sleeve
22-2. Ring
23-1. Quick change chuck for SDS-plus
23-2. Change cover line
23-3. Change cover
24-1. Spindle
24-2. Quick change drill chuck
24-3. Change cover
24-4. Change cover line
25-1. Quick change drill chuck
25-2. Sleeve
25-3. Ring
---|---|---

SPECIFICATIONS

Model	DHR242		DHR243
Capacities	Concrete		24 mm
Steel		13 mm
Wood		27 mm
No load speed (min-1)		0 – 950
Blows per minute		0 – 4,700
Overall length	328 mm		353 mm
Net weight	3.3 kg		3.4 kg
Rated voltage		D.C. 18 V

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

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

ENG905-1
Noise
The typical A-weighted noise level determined according to EN60745:
Model DHR242
Sound pressure level (LpA) : 90 dB (A)
Sound power level (LWA) : 101 dB (A)
Uncertainty (K) : 3 dB (A)
Model DHR243
Sound pressure level (LpA) : 89 dB (A)
Sound power level (LWA) : 100 dB (A)
Uncertainty (K) : 3 dB (A)

Wear ear protection
ENG900-1
Vibration

The vibration total value (tri-axial vector sum) determined according to EN60745:
Model DHR242
Work mode: hammer drilling into concrete
Vibration emission (ah, HD) : 13.5 m/s²
Uncertainty (K): 1.5 m/s²
Work mode: chiseling
Vibration emission (ah, CHeq) : 10.5 m/s²
Uncertainty (K) : 1.5 m/s²
Work mode: drilling into metal
Vibration emission (ah,D) : 3.5 m/s²
Uncertainty (K) : 1.5 m/s²

Model DHR243
Work mode: hammer drilling into concrete
Vibration emission (ah, HD) : 13 m/s²
Uncertainty (K) : 1.5 m/s²
Work mode : chiseling
Vibration emission (ah, CHeq) : 11 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 the 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 is 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).

For European countries only
EC Declaration of Conformity
Makita declares that the following Machine(s):
Designation of Machine:
Cordless Combination Hammer
Model No./ Type: DHR242, DHR243
Conforms to the following European Directives:
2006/42/EC
They are manufactured in accordance with the following standard or standardized documents:
EN60745
The technical file in accordance with 2006/42/EC is available from:
Makita, Jan-Baptist Vinkstraat 2, 3070, Belgium

Makita, Jan-Baptist Vinkstraat 2, 3070, Belgium

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 the 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 eyes or sunglasses 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 the 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, the 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 anyone 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 the operation; they may be extremely hot and could burn your skin.
Some material contains chemicals that 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 the 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 the battery cartridge, read all instructions and cautionary markings on (1) the battery charger, (2) the battery, and (3) the product using the battery.
Do not disassemble the battery cartridge.
If the 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:
(1) Do not touch the terminals with any conductive material.
(2) Avoid storing battery cartridges in a container with other metal objects such as nails, coins, etc.
(3) Do not expose the 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 ﾟ C (122 ﾟ 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 the battery.
Do not use a damaged battery.

SAVE THESE INSTRUCTIONS.

Tips for maintaining maximum battery life

1. Charge the battery cartridge before completely discharged. Always stop tool operation and charge the battery cartridge when you notice less tool power.
2. Never recharge a fully charged battery cartridge. Overcharging shortens the battery service life.
3. Charge the battery cartridge at room temperature at 10 ﾟ C – 40 ﾟ C (50 ﾟ F – 104 ﾟ F).
Let a hot battery cartridge cool down before charging it.
4. 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 the function on the tool.

Installing or removing the battery cartridge

CAUTION:

Hold the tool and the battery cartridge firmly when installing or removing the battery cartridge. Failure to hold the tool and the battery cartridge firmly may cause them to slip off your hands and result in damage to the tool and battery cartridge and a personal injury.

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.

Changing the quick change chuck for
SDS-plus
For model DHR243
The quick change chuck for SDS-plus can be easily exchanged for the quick change drill chuck.
Removing the quick change chuck for SDS-plus
Fig.5

CAUTION:

Before removing the quick change chuck for SDS-plus, always remove the bit.
Grasp the change cover of the quick change chuck for SDS-plus and turn in the direction of the arrow until the change cover line moves from the symbol to the symbol. Pull forcefully in the direction of the arrow.

Attaching the quick change drill chuck
Fig.6
Check the line of the quick change drill chuck showing the symbol. Grasp the change cover of the quick change drill chuck and set the line to the symbol.
Place the quick change drill chuck on the spindle of the tool.
Grasp the change cover of the quick change drill chuck and turn the change cover line to the symbol until a click can clearly be heard.

Selecting the action mode
Rotation with hammering
Fig.7
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.8
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.9
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.
When changing from the symbol mode to the symbol mode, the action mode changing knob may no longer move in the symbol position. At this time, turn the tool on or turn the chuck by hand in the symbol position and then rotate the action mode changing knob. Forcing the action mode changing knob may cause tool damage.

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.10
CAUTION:

Always use the side grip to ensure operating safety.
Install the side grip so that the protrusion on the grip fits in between the grooves in 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 long service life.
Installing or removing the bit
Clean the bit shank and apply bit grease before installing the bit.
Fig.11
Insert the bit into the tool. Turn the bit and push it in until it engages.

Fig.12
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.13
Bit angle
(when chipping, scaling or demolishing)
Fig.14
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.15
Depth gauge
Fig.16
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.17
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 to which the dust cup can be attached 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.18
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.19
After drilling the hole, use the blow-out bulb to clean the dust out of the hole.
Chipping/Scaling/Demolition
Fig.20
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 its efficiency.

Drilling in wood or metal
Fig.21
Fig.22
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.
For model DHR243
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.

Fig.23
Fig.24
Use the quick-change drill chuck as standard equipment. When installing it, refer to “changing the quick change chuck for SDS-plus ” described on the previous page.
Fig.25
Hold the ring and turn the sleeve counterclockwise to open the chuck jaws. Place the bit in the chuck as far as it will go. Hold the ring firmly and turn the sleeve clockwise to tighten the chuck. To remove the bit, hold the ring and turn the sleeve counterclockwise.
Set the action mode changing knob to the symbol. You can drill up to 13 mm in diameter in metal and up to 32 mm in diameter in wood.

CAUTION:

Never use “rotation with hammering” when the quick change drill chuck is installed on the tool. The quick-change drill chuck 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’s 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 an inspection or maintenance.
Never use gasoline, benzene, thinner, alcohol, or the like. Discoloration, deformation, or cracks may result.

To maintain product SAFETY and RELIABILITY, repairs, carbon brush inspection, replacement, and 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 with more details regarding these accessories, ask your local Makita Service Center.