MAKITA HR1840 Rotary Hammer Instruction Manual

: June 5, 2024
: Makita

INSTRUCTION MANUAL

Original instructions

SPECIFICATIONS

Model:	HR1840	HR1841F
Capacities	Concrete	18 mm
Core bit	35 mm
Diamond core bit (dry type)	65 mm
Steel	13 mm
Wood	24 mm
No load speed	0 – 2,100 min¹
Blows per minute	0 – 4,800 min¹
Overall length	285 mm
Net weight	2.0 – 2.4 kg	2.0 – 2.5 kg
Safety class

Due to our continuing program of research and development, the specifications herein are subject to change without notice.
Specifications may differ from country to country.
The weight may differ depending on the attachment(s). The lightest and heaviest combinations, according to
EPTA-Procedure 01/2014, are shown in the table.

Intended use

The tool is intended for hammer drilling and drilling in brick, concrete and stone. It is also suitable for drilling without impact in wood, metal, ceramic and plastic.

Power supply

The tool should be connected only to a power supply of the same voltage as indicated on the nameplate, and can only be operated on single-phase AC supply. They are double-insulated and can, therefore, also be used from sockets without earth wire.

Noise

The typical A-weighted noise level determined according to EN62841-2-6:

Model HR1840
Sound pressure level (LpA): 85 dB (A)
Sound power level (LWA): 98 dB (A)
Uncertainty (K) : 3 dB (A)

Model HR1841F
Sound pressure level (LpA): 85 dB(A)
Sound power level (LWA): 96 dB (A)
Uncertainty (K) : 3 dB(A)

NOTE: The declared noise emission value(s) has been measured in accordance with a standard test method and may be used for comparing one tool with another.
NOTE: The declared noise emission value(s) may also be used in a preliminary assessment of exposure.

WARNING: Wear ear protection.
WARNING: The noise emission during actual use of the power tool can differ from the declared value(s) depending on the ways in which the tool is used especially what kind of workpiece is processed.
WARNING: Be sure to identify safety mea- sures 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).

Vibration

The following table shows the vibration total value (tri-axial vector sum) determined according to applicable standard.

Model HR1840

Work mode| Vibration emission| Uncertainty (K)| Applicable standard /
Test condition
---|---|---|---
Hammer drilling into
concrete (ah, HD)| 29.8 m/s²| 1.5 m/s²| EN62841-2-6

Model HR1841F

Work mode| Vibration emission| Uncertainty (K)| Applicable standard /
Test condition
---|---|---|---
Hammer drilling into
concrete ( ah, HD)| 8.9 m/s2| 1.5 m/s2| EN62841-2-6
7.9 m/s2| 1.5 1.5 m/s2| Recommended practical
operation*

The test condition of recommended practical operation meets EN 62841-2-6, except for the following points:
- Feed force is applied to the switch handle (main handle) for working accuracy and efficiency.
- The side grip/handle (auxiliary handle) is held to keep balance of the tool.

NOTE: The declared vibration total value(s) has been measured in accordance with a standard test method and may be used for comparing one tool with another.
NOTE: The declared vibration total value(s) 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 value(s) depending on the ways in which the tool is used especially what kind of workpiece is processed.
WARNING: 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).

EC Declaration of Conformity

For European countries only
The EC declaration of conformity is included as Annex A to this instruction manual.

SAFETY WARNINGS

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.

ROTARY HAMMER SAFETY WARNINGS

Safety instructions for all operations

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 or its own cord. Cutting accessory contacting a “live” wire may make exposed metal parts of the power tool “live” and could give the operator an electric shock.

Safety instructions when using long drill bits with rotary hammers

Always start drilling at low speed and with the bit tip in contact with the workpiece. At higher speeds, the bit is likely to bend if allowed to rotate freely without contacting the workpiece, resulting in personal injury.
Apply pressure only in direct line with the bit and do not apply excessive pressure. Bits can bend, causing breakage or loss of control, resulting in personal injury.

Additional safety warnings

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, parts close to the bit, or workpiece 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.
Do not touch the power plug with wet hands.

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.

FUNCTIONAL DESCRIPTION

CAUTION: Always be sure that the tool is switched off and unplugged before adjusting or checking function on the tool.

Switch action

CAUTION: Before plugging in the tool, always check to see that the switch trigger actuates properly and returns to the “OFF” position when
released.
CAUTION: Switch can be locked in “ON” position for ease of operator comfort during extended use. Apply caution when locking tool in “ON” position and maintain firm grasp on tool.

► Fig.1: 1. Switch trigger 2. Lock button
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.
For continuous operation, pull the switch trigger, push in the lock button and then release the switch trigger. To stop the tool from the locked position, pull the switch trigger fully, then release it.

Lighting up the front lamp

For HR1841F
► Fig.2: 1. Switch trigger 2. Lamp

CAUTION: Do not look in the light or see the source of light directly.

To turn on the lamp, pull the switch trigger. Release the switch trigger to turn it off.

NOTICE: Do not use thinner or gasoline to clean the lamp. Such solvents may damage it.
NOTE: Use a dry cloth to wipe the dirt off the lens of the lamp. Be careful not to scratch the lens of lamp, or it may lower the illumination.

Reversing switch action

CAUTION: Always check the direction of rotation before operation.

NOTICE: 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.
NOTICE: When changing the direction of rotation, be sure to fully set the reversing switch to position (A side) or (B side). Otherwise, when the switch trigger is pulled, the motor may not rotate or the tool may not work properly.

► Fig.3: 1. Reversing switch lever
This tool has a reversing switch to change the direction of rotation. Move the reversing switch lever to the position (A side) for clockwise rotation or to the position (B side) for counterclockwise rotation.

Selecting the action mode

NOTICE: Do not rotate the action mode changing knob when the tool is running. The tool will be damaged.
NOTICE: 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 action mode positions.

Rotation with hammering
For drilling in concrete, masonry, etc., rotate the action mode changing knob to the symbol. Use a carbide-tipped drill bit.

► Fig.4: 1. Action mode changing knob

Rotation only
For drilling in wood, metal or plastic materials, rotate the action mode changing knob to the symbol. Use a twist drill bit or wood drill bit.
► Fig.5: 1. Action mode changing knob

Torque limiter

NOTICE: As soon as the torque limiter actuates, switch off the tool immediately. This will help prevent premature wear of the tool.
NOTICE: Drill bits such as hole saw, which tend to pinch or catch easily in the hole, are not appropriate for this tool. This is because they will cause the torque limiter to actuate too frequently.

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

ASSEMBLY

CAUTION: Always be sure that the tool is switched off and unplugged before carrying out any work on the tool.

Side grip (auxiliary handle)

CAUTION: Always use the side grip to ensure safe operation.
CAUTION: After installing or adjusting the side grip, make sure that the side grip is firmly secured.

Install the side grip so that the grooves on the grip fit in the protrusions on the tool barrel. Turn the grip clockwise to secure it. The grip can be fixed at desired angle.
► Fig.6: 1. Side grip

Grease

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

Installing or removing drill bit

Clean the shank end of the drill bit and apply grease before installing the drill bit.
► Fig.7: 1. Shank end 2. Grease

Insert the drill bit into the tool. Turn the drill bit and push it in until it engages.
After installing the drill bit, always make sure that the drill bit is securely held in place by trying to pull it out.
► Fig.8: 1. Drill bit

To remove the drill bit, pull the chuck cover down all the way and pull the drill bit out.
► Fig.9: 1. Drill bit 2. Chuck cover

Depth gauge

The depth gauge is convenient for drilling holes of uniform depth. Loosen the side grip and insert the depth gauge into the hole on the side grip. Adjust the depth gauge to the desired depth and tighten the side grip firmly.
► Fig.10: 1. Hole 2. Depth gauge

NOTE: Make sure that the depth gauge does not touch the main body of the tool when attaching it.

Dust cup

Optional accessory
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.

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

► Fig.11: 1. Dust cup

Dust cup set

Optional accessory
Installing the dust cup set
NOTICE: If you purchase the dust cup set as optional accessory, the standard side grip cannot be used with the dust cup set being installed on the tool. When the dust cup set is installed on the tool, remove the grip from the standard side grip, and then attach it to the optional grip base set.
► Fig.12: 1. Bolt 2. Grip 3. Optional grip base set

NOTICE: Do not use the dust cup set when drilling in metal or similar. It may damage the dust cup set due to the heat produced by small metal dust or similar. Do not install or remove the dust cup set with the drill bit installed in the tool. It may damage the dust cup set and cause dust leak.

Before installing the dust cup set, remove the bit from the tool if installed.

Install the spacer so that the grooves on the spacer fit in the protrusions on the tool barrel while widening it. Be careful for the spring not to come off from the slit of spacer.
► Fig.13: 1. Spacer 2. Spring
► Fig.14
Install the side grip (optional grip base set and the grip removed from standard side grip) so that the groove on the grip fit in the protrusion on the spacer. Turn the grip clockwise to secure it.
► Fig.15: 1. Side grip
Install the dust cup set so that the claws of the dust cup fit in in the slits on the spacer.
► Fig.16: 1. Dust cup 2. Claws

NOTE: If you connect a vacuum cleaner to the dust cup set, remove the dust cap before connecting it.
► Fig.17: 1. Dust cap

Removing the drill bit
To remove the drill bit, pull the chuck cover down all the way and pull the drill bit out.
► Fig.18: 1. Bit 2. Chuck cover

Removing the dust cup set
To remove the dust cup set, follow the steps below.

Loosen the side grip.
► Fig.19: 1. Side grip
Hold the root of dust cup and pull it out.
► Fig.20: 1. Dust cup

NOTE: If it is difficult to remove the dust cup set, remove the claws of the dust cup one by one by swinging and pulling the root of the dust cup.
NOTE: If the cap comes off from the dust cup, attach it with its printed side facing up so that groove on the cap fits in the inside periphery of the attachment.
► Fig.21

OPERATION

CAUTION: Always use the side grip (auxiliary handle) and firmly hold the tool by both side grip and switch handle during operations.
CAUTION: Always make sure that the work- piece is secured before operation.
► Fig.22

Hammer drilling operation

CAUTION: There is tremendous and sudden twisting force exerted on the tool/drill 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.
Set the action mode changing knob to the symbol. Position the drill 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 drill bit partially from the hole. By repeating this several times, the hole will be cleaned out and normal drilling may be resumed.
NOTE: Eccentricity in the drill 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.

Drilling in wood or metal

CAUTION: Hold the tool firmly and exert care when the drill bit begins to break through the workpiece. There is a tremendous force exerted on the tool/drill bit at the time of hole break through.
CAUTION: A stuck drill 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.
CAUTION: Always secure workpieces in a vise or similar hold-down device.

NOTICE: Never use “rotation with hammering” when the drill chuck is installed on the tool. The drill chuck may be damaged.
Also, the drill chuck will come off when reversing the tool.
NOTICE: 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 drill
bit, decrease the tool performance and shorten the service life of the tool.
Set the action mode changing knob to the symbol. Attach the chuck adapter to a keyless drill chuck to which 1/2″-20 size screw can be installed, and then install them to the tool. When installing it, refer to the section “Installing or removing drill bit”.
► Fig.23: 1. Keyless drill chuck 2. Chuck adapter

Blow-out bulb

Optional accessory
After drilling the hole, use the blow-out bulb to clean the dust out of the hole.
► Fig.24

Using dust cup set

Optional accessory
Fit the dust cup set against the ceiling when operating the tool.
► Fig.25

NOTICE: Do not use the dust cup set when drilling in metal or similar. It may damage the dust cup set due to the heat produced by small metal dust or similar.
NOTICE: Do not install or remove the dust cup set with the drill bit installed in the tool. It may damage the dust cup set and cause dust leak.

MAINTENANCE

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

To maintain product SAFETY and RELIABILITY, repairs, any other maintenance or adjustment should be performed by Makita Authorized or Factory 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.