Makita Power Hammer HR2420 User Manual

Rotary Hammer  
25 mm (1”)  
MODEL HR2420  
003095  
DOUBLE  
INSULATION  
I N S T R U C T I O N M A N U A L  
WARNING:  
For your personal safety, READ and UNDERSTAND before using.  
SAVE THESE INSTRUCTIONS FOR FUTURE REFERENCE.  
w w w. m a k i t a t o o l s . c o m  
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trician to install a polarized outlet. Do not  
change the plug in any way. Double insula-  
13. Do not overreach. Keep proper footing  
and balance at all times. Proper footing and  
balance enables better control of the tool in  
unexpected situations.  
tion  
eliminates the need for the three wire  
grounded power cord and grounded power  
supply system.  
14. Use safety equipment. Always wear eye  
protection. Dust mask, non-skid safety  
shoes, hard hat, or hearing protection must  
be used for appropriate conditions. Ordinary  
eye or sun glasses are NOT eye protection.  
5. Avoid body contact with grounded sur-  
faces such as pipes, radiators, ranges and  
refrigerators. There is an increased risk of  
electric shock if your body is grounded.  
Tool Use and Care  
6. Do not expose power tools to rain or wet  
conditions. Water entering a power tool will  
increase the risk of electric shock.  
15. Use clamps or other practical way to  
secure and support the workpiece to a  
stable platform. Holding the work by hand or  
against your body is unstable and may lead  
to loss of control.  
7. Do not abuse the cord. Never use the cord  
to carry the tools or pull the plug from an  
outlet. Keep cord away from heat, oil,  
sharp edges or moving parts. Replace  
damaged cords immediately. Damaged  
cords increase the risk of electric shock.  
16. Do not force tool. Use the correct tool for  
your application. The correct tool will do the  
job better and safer at the rate for which it is  
designed.  
8. When operating a power tool outside, use  
an outdoor extension cord marked “W-A”  
or “W”. These cords are rated for outdoor  
use and reduce the risk of electric shock.  
17. Do not use tool if switch does not turn it  
on or off. Any tool that cannot be controlled  
with the switch is dangerous and must be  
repaired.  
Personal Safety  
18. Disconnect the plug from the power  
source before making any adjustments,  
changing accessories, or storing the tool.  
Such preventive safety measures reduce the  
risk of starting the tool accidentally.  
9. Stay alert, watch what you are doing and  
use common sense when operating a  
power tool. Do not use tool while tired or  
under the influence of drugs, alcohol, or  
medication. A moment of inattention while  
operating power tools may result in serious  
personal injury.  
19. Store idle tools out of reach of children  
and other untrained persons. Tools are  
dangerous in the hands of untrained users.  
10. Dress properly. Do not wear loose cloth-  
ing or jewelry. Contain long hair. Keep  
your hair, clothing, and gloves away from  
moving parts. Loose clothes, jewelry, or long  
hair can be caught in moving parts.  
20. Maintain tools with care. Keep cutting  
tools sharp and clean. Properly maintained  
tools with sharp cutting edges are less likely  
to bind and are easier to control.  
11. Avoid accidental starting. Be sure switch  
is off before plugging in. Carrying tools with  
your finger on the switch or plugging in tools  
that have the switch on invites accidents.  
21. Check for misalignment or binding of  
moving parts, breakage of parts, and any  
other condition that may affect the tools  
operation. If damaged, have the tool ser-  
viced before using. Many accidents are  
caused by poorly maintained tools.  
12. Remove adjusting keys or wrenches  
before turning the tool on. A wrench or a  
key that is left attached to a rotating part of  
the tool may result in personal injury.  
22. Use only accessories that are recom-  
mended by the manufacturer for your  
3
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model. Accessories that may be suitable for  
one tool, may become hazardous when used  
on another tool.  
tenance performed by unqualified personnel  
could result in a risk of injury.  
24. When servicing a tool, use only identical  
replacement parts. Follow instructions in  
the Maintenance section of this manual.  
Use of unauthorized parts or failure to follow  
Maintenance instructions may create a risk of  
electric shock or injury.  
SERVICE  
23. Tool service must be performed only by  
qualified repair personnel. Service or main-  
USE PROPER EXTENSION CORD: Make sure your extension cord is in good condition.  
When using an extension cord, be sure to use one heavy enough to carry the current your  
product will draw. An undersized cord will cause a drop in line voltage resulting in loss of  
power and overheating. Table 1 shows the correct size to use depending on cord length and  
nameplate ampere rating. If in doubt, use the next heavier gage. The smaller the gage num-  
ber, the heavier the cord.  
Table 1: Minimum gage for cord  
Volts  
120 V  
Total length of cord in feet  
Ampere Rating  
25 ft.  
50 ft.  
100 ft.  
150 ft.  
More Than  
Not More Than  
AWG  
0
6
10  
12  
6
18  
18  
16  
14  
16  
16  
16  
12  
16  
14  
14  
14  
12  
12  
10  
12  
16  
Not Recommended  
SPECIFIC SAFETY RULES  
USB010-2  
DO NOT let comfort or familiarity with product (gained from  
repeated use) replace strict adherence to rotary hammer safety  
rules. If you use this tool unsafely or incorrectly, you can suffer  
serious personal injury.  
1. Hold tools by insulated gripping surfaces  
when performing an operation where the  
cutting tool may contact hidden wiring or  
its own cord. Contact with a livewire will  
make exposed metal parts of the tool live”  
and shock the operator.  
to high intensity noise can cause hearing  
loss.  
3. 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.  
2. Wear ear protectors when using the tool  
for extended periods. Prolonged exposure  
4. Be sure the bit is secured in place before  
operation.  
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5. 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.  
9. Keep hands away from moving parts.  
10. Do not leave the tool running. Operate the  
tool only when hand-held.  
11. Do not point the tool at any one in the area  
when operating. The bit could fly out and  
injure someone seriously.  
6. 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 lubrica-  
tion. Without proper warm-up, hammering  
operation is difficult.  
12. Do not touch the bit or parts close to the  
bit immediately after operation; they may  
be extremely hot and could burn your  
skin.  
7. Always be sure you have a firm footing.  
Be sure no one is below when using the  
tool in high locations.  
13. Some material contains chemicals which  
may be toxic. Take caution to prevent dust  
inhalation and skin contact. Follow mate-  
rial supplier safety data.  
8. Hold the tool firmly with both hands.  
SAVE THESE INSTRUCTIONS  
WARNING:  
MISUSE or failure to follow the safety rules stated in this  
instruction manual may cause serious personal injury.  
5
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FUNCTIONAL  
DESCRIPTION  
CAUTION:  
Always be sure that the tool is switched off and  
unplugged before adjusting or checking function on the  
tool.  
003108  
Switch action  
CAUTION:  
1
Before plugging in 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.  
1. Switch trigger  
003116  
Reversing switch action  
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 the  
counterclockwise rotation.  
position (B side) for  
A
1
2
B
CAUTION:  
Always check the direction of rotation before operation.  
1. Reversing switch lever  
2. Switch trigger  
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.  
003124  
Selecting the action mode  
This tool employs an action mode changing knob. Select one  
of the two modes suitable for your work needs by using this  
knob.  
For rotation only, turn the knob so that the arrow on the knob  
points toward the  
For rotation with hammering, turn the knob so that the arrow  
mark on the tool body.  
1
1. Action mode changing knob  
on the knob points toward the  
mark on the tool body.  
CAUTION:  
Always set the knob fully to your desired mode mark. If  
you operate the tool with the knob positioned halfway  
between the mode marks, the tool may be damaged.  
6
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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, core bits, diamond core bits, etc. 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  
unplugged before carrying out any work on the tool.  
003143  
Side grip (auxiliary handle)  
2
The side grip swings around to either side, allowing easy  
handling of the tool in any position. Loosen the side grip by  
turning it counterclockwise, swing it to the desired position  
and then tighten it by turning clockwise.  
1
1. Side grip  
2. Clamp Screw  
Bit grease (optional accessory)  
Coat the bit shank head beforehand with a small amount of  
bit grease (about 0.5 -1 g; 0.02 - 0.04 oz.). This chuck lubri-  
cation assures smooth action and longer service life.  
003150  
Installing or removing the bit  
Clean the bit shank and apply bit grease before installing the  
bit.  
2
1
1. Bit shank  
2. Bit grease  
7
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003158  
Insert the bit into the tool. Turn the bit and push it in until it  
engages.  
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.  
1
2
After installing, always make sure that the bit is securely held  
in place by trying to pull it out.  
1. Bit  
2. Chuck cover  
003163  
To remove the bit, pull the chuck cover down all the way and  
pull the bit out.  
1
2
1. Bit  
2. Chuck cover  
003181  
Depth gauge  
1
The depth gauge is convenient for drilling holes of uniform  
depth. Insert the depth gauge into the hole in the grip base.  
Adjust the depth gauge to the desired depth and then tighten  
the clamp screw to secure the depth gauge.  
2
NOTE:  
The depth gauge cannot be used at the position where  
the depth gauge strikes against the tool body.  
1. Clamp screw  
2. Depth gauge  
003186  
Dust cup (optional accessory)  
Use the dust cup to prevent dust from falling over the tool  
and on yourself when performing overhead drilling opera-  
tions. 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.  
1
Bit diameter  
Dust cup 5 6 mm (1/4) - 14.5 mm (9/16)  
Dust cup 9 12 mm (15/32) - 16 mm (5/8)  
1. Dust cup  
8
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Hammer drilling operation  
OPERATION  
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 slip-  
ping 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 sev-  
eral 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.  
002449  
Blow-out bulb (optional accessory)  
After drilling the hole, use the blow-out bulb to clean the dust  
out of the hole.  
1
1. Blow-out bulb  
003219  
Drilling in wood or metal  
Use the optional drill chuck assembly. When installing it, refer  
to Installing or removing the bitdescribed on the previous  
page.  
Set the action mode changing knob to rotation only.  
1
You can drill up to 13 mm (1/2) diameter in metal and up to  
32 mm (1-1/4) diameter in wood.  
1. Drill chuck assembly  
9
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CAUTION:  
Never use rotation with hammeringwhen 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  
unplugged before attempting to perform inspection or  
maintenance.  
To maintain product SAFETY and RELIABILITY, repairs, car-  
bon brush inspection and replacement, any other mainte-  
nance or adjustment should be performed by Makita  
Authorized or Factory Service Centers, always using Makita  
replacement parts.  
10  
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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  
Drill chuck assembly  
Drill chuck S13  
Chuck adapter  
Chuck key S13  
Bit grease  
Grip assembly  
Depth gauge  
Blow-out bulb  
Dust cup  
Dust extractor attachment  
Safety goggles  
Plastic carrying case  
11  
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Memo  
12  
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First-Class  
Postage  
Required  
Post Office will  
not deliver  
without proper  
postage.  
Makita U.S.A., Inc.  
14930 Northam Street  
La Mirada, CA 90638-5753  
Fold  
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MAIL THIS PORTION  
Your answers to the following questions are appreciated.  
1.This product was purchased from:  
3. How did you learn about this product:  
Home Center  
Other (  
)
Magazine  
Radio  
Hardware/Lumber Store  
Tool Distributor  
From Dealer  
Newspaper  
Store Display  
Catalog  
Exhibition  
From Friend  
Previous Usage  
Other (  
Industrial Supply  
Construction Supply  
)
2. Use of the product is intended for:  
4. Most favored points are:  
Construction Trade  
Industrial Maintenance  
Home Maintenance  
Hobby  
Design  
Repair Service  
Durability  
Power  
Features  
Size  
Price  
Other (  
)
Other (  
)
Makita Brand  
5. Any comments:  
DATE PURCHASED  
MONTH  
MODEL NO.  
DAY  
YEAR  
SERIAL NO.  
STATUS  
SEX  
Married Single  
M
F
INTL.  
LAST NAME / COMPANY NAME  
STREET ADRESS  
CITY  
AREA  
CODE  
STATE  
ZIP CODE  
PHONE  
40-49  
Under 19  
20-29  
30-39  
50-60  
Over 60  
AGE:  
BE SURE TO COMPLETE THE CUSTOMERS PORTION OF THIS FORM AND RETAIN FOR YOUR RECORDS.  
Please return this portion by facsimile or mail.  
Facsimile No: (714) 522-8133  
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Paste  
Paste  
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Paste  
FACTORY SERVICE CENTERS  
1-800-4-MAKITA  
RETAIN THIS PORTION FOR YOUR RECORDS  
ARIZONA  
FLORIDA  
MISSOURI  
PENNSYLVANIA  
1704 Babcock Blvd.  
Pittsburgh, PA 15209  
(412) 822-7370  
3707 E. Broadway Rd., Ste. 6  
Phoenix, AZ 85040  
(602) 437-2850  
750 East Sample Road  
Pompano Beach, FL 33064  
(954) 781-6333  
9876 Watson Road  
St. Louis, MO 63126-2221  
(314) 909-9889  
CALIFORNIA  
GEORGIA  
NEBRASKA  
PUERTO RICO  
41850 Christy St.  
Fremont, CA 94538-5107  
(510) 657-9881  
4680 River Green Parkway NW  
Duluth, GA 30096  
(770) 476-8911  
4129 S. 84th St.  
Omaha, NE 68127  
(402) 597-2925  
200 Guayama St.  
Hato Rey, PR 00917  
(787) 250-8776  
14930 Northam St.  
La Mirada, CA 90638-5753  
(714) 522-8088  
ILLINOIS  
NEVADA  
3375 S. Decatur Blvd.  
Suites. 22 - 24  
Las Vegas, NV 89102  
(702) 368-4277  
TENNESSEE  
1120 Elm Hill P.  
Suile 170 Nashville, TN 372  
(615) 248-3321  
1450 Feehanville Dr.  
Mt. Prospect, IL 60056-6011  
(847) 297-3100  
1970 Fulton Avenue  
Sacramento, CA 95825  
(916) 482-5197  
MARYLAND  
TEXAS  
7674 Clairemont Mesa Blvd.  
San Diego, CA 92111  
(858) 278-4471  
7397 Washington Boulevard,  
Suite 104 Elkridge, MD 21075  
(410) 796-4401  
NEW JERSEY  
12801 Stemmons Fwy Ste. 809  
Farmers Branch, TX 75234  
(972) 243-1150  
251 Herrod Blvd.  
Dayton, NJ 08810-1539  
(609) 655-1212  
16735 Saticoy St., Ste. 105  
Van Nuys, CA 91406  
(818) 782-2440  
12701 Directors Dr.  
Stafford, TX 77477-3701  
(281) 565-8665  
MASSACHUSETTS  
232 Providence Hwy.  
Westwood, MA 02090  
(781) 461-9754  
NEWYORK  
4917 Genessee Street  
Cheektowaga, NY 14225  
(716) 685-9503  
3453 IH-35 North, Ste. 101  
San Antonio, TX 78219  
(210) 228-0676  
COLORADO  
11839 E. 51st Ave.  
Denver, CO 80239-2709  
(303) 371-2850  
MINNESOTA  
6427 Penn Ave. South  
Richfield, MN 55423  
(612) 869-5199  
OREGON  
828 19th Avenue, N.W.  
Portland, OR 97209  
(503) 222-1823  
WISCONSIN  
Lincoln Plaza Shopping Ctr.  
2245 S. 108th St. West Allis, WI  
53227  
(414) 541-4776  
CUSTOMER’S RECORD  
Date Purchased  
When you need service: Send  
complete tool (prepaid) to one  
of the Makita Factory Service  
Centers listed, or to an Authorized  
Makita Service Center. Be sure  
to attach a letter to the outside of  
the carton detailing the problem  
with your tool.  
Dealer’s Name & Address  
Model No.  
Serial No.  
15  
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WARNING  
Some dust created by power sanding, sawing, grinding, drilling, and other  
construction activities contains chemicals known to the State of California  
to cause cancer, birth defects or other reproductive harm. Some examples  
of these chemicals are:  
lead from lead-based paints,  
crystalline silica from bricks and cement and other masonry products, and  
arsenic and chromium from chemically-treated lumber.  
Your risk from these exposures varies, depending on how often you do this  
type of work. To reduce your exposure to these chemicals: work in a well  
ventilated area, and work with approved safety equipment, such as those  
dust masks that are specially designed to filter out microscopic particles.  
MAKITA LIMITED ONE YEAR WARRANTY  
Warranty Policy  
Every Makita tool is thoroughly inspected and tested before leaving the factory. It is warranted to be free of  
defects from workmanship and materials for the period of ONE YEAR from the date of original purchase.  
Should any trouble develop during this one year period, return the COMPLETE tool, freight prepaid, to one of  
Makitas Factory or Authorized Service Centers. If inspection shows the trouble is caused by defective  
workmanship or material, Makita will repair (or at our option, replace) without charge.  
This Warranty does not apply where:  
repairs have been made or attempted by others:  
repairs are required because of normal wear and tear:  
the tool has been abused, misused or improperly maintained:  
alterations have been made to the tool.  
IN NO EVENT SHALL MAKITA BE LIABLE FOR ANY INDIRECT, INCIDENTAL OR CONSEQUENTIAL  
DAMAGES FROM THE SALE OR USE OF THE PRODUCT. THIS DISCLAIMER APPLIES BOTH DURING  
AND AFTER THE TERM OF THIS WARRANTY.  
MAKITA DISCLAIMS LIABILITY FOR ANY IMPLIED WARRANTIES, INCLUDING IMPLIED WARRANTIES OF  
MERCHANTABILITYAND FITNESS FOR A SPECIFIC PURPOSE,AFTER THE ONE YEAR TERM OF THIS  
WARRANTY.  
This Warranty gives you specific legal rights, and you may also have other rights which vary from state to state.  
Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above  
limitation or exclusion may not apply to you. Some states do not allow limitation on how long an implied  
warranty lasts, so the above limitation may not apply to you.  
Makita Corporation  
3-11-8, Sumiyoshi-cho,  
Anjo, Aichi 446-8502 Japan  
884089D066  
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