Makita Power Hammer HR3851 User Manual

Rotary Hammer  
38 mm (1 - 1/2”)  
MODEL HR3851  
003098  
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  
 
to whether the outlet is properly  
grounded. If the tools should electrically mal-  
function or break down, grounding provides a  
low resistance path to carry electricity away  
from the user.  
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.  
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.  
6. Do not expose power tools to rain or wet  
conditions. Water entering a power tool will  
increase the risk of electric shock.  
Tool Use and Care  
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  
9. Stay alert, watch what you are doing and  
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.  
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
 
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: Use only three-wire extension cords that have three-  
prong grounding-type plugs and three-pole receptacles that accept the tool's plug. Make  
sure your extension cord is in good condition. Replace or repair damaged or worn cord  
immediately. 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 number, 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  
GROUNDING INSTRUCTIONS  
This tool should be grounded while in use to protect the operator from electric shock. The  
tool is equipped with a three-conductor cord and three-prong grounding type plug to fit the  
proper grounding type receptacle. The green (or green and yellow) conductor in the cord is  
the grounding wire. Never connect the green (or green and yellow) wire to a live terminal.  
Your unit is for use on 120 volts and has a plug that looks like Fig. “A”.  
4
 
An adapter Fig. “B” and “C” is available for connecting Fig. “A” type plugs to two-prong  
receptacles. The green-colored rigid ear, lug, etc., extending from the adapter must be con-  
nected to a permanent ground, such as a properly grounded outlet box.  
Adapter  
Grounding Means  
Cover of Grounded  
Grounding  
Blade  
Outlet Box  
Fig. A  
Fig. B  
Fig. C  
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 “live” wire will  
make exposed metal parts of the tool “live”  
and shock the operator.  
4. Be sure the bit is secured in place before  
operation.  
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.  
2. Wear ear protectors when using the tool  
for extended periods. Prolonged exposure  
to high intensity noise can cause hearing  
loss.  
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.  
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.  
7. Always be sure you have a firm footing.  
Be sure no one is below when using the  
tool in high locations.  
5
 
8. Hold the tool firmly with both hands.  
9. Keep hands away from moving parts.  
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.  
10. Do not leave the tool running. Operate the  
tool only when hand-held.  
13. Some material contains chemicals which  
may be toxic. Take caution to prevent dust  
inhalation and skin contact. Follow mate-  
rial supplier safety data.  
11. Do not point the tool at any one in the area  
when operating. The bit could fly out and  
injure someone seriously.  
SAVE THESE INSTRUCTIONS  
WARNING:  
MISUSE or failure to follow the safety rules stated in this  
instruction manual may cause serious personal injury.  
6
 
FUNCTIONAL  
DESCRIPTION  
CAUTION:  
Always be sure that the tool is switched off and  
unplugged before adjusting or checking function on the  
tool.  
003111  
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. Release the  
switch trigger to stop.  
1. Switch trigger  
003127  
Selecting the action mode  
1
2
3
Rotation with hammering  
For drilling in concrete, masonry, etc., rotate the change lever  
to the  
symbol.  
Hammering only  
For chipping, scaling or demolition operations, rotate the  
change lever to the  
symbol.  
1. Change lever  
2. For hammering only  
CAUTION:  
3. For rotation with hammering  
Do not rotate the change lever when the tool is running  
under load. The tool will be damaged.  
To avoid rapid wear on the mode change mechanism, be  
sure that the change lever is always positively located in  
one of the two action mode positions.  
7
 
ASSEMBLY  
CAUTION:  
Always be sure that the tool is switched off and  
unplugged before carrying out any work on the tool.  
003146  
Side grip (auxiliary handle)  
For maximum control and safer operation, always use the  
side grip with this tool. 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 clock-  
wise.  
1
2
1. Side grip  
2. Grip base  
003149  
The side grip can also be installed in the position shown in  
the figure. Remove the side grip from the grip base by turn-  
ing the side grip counterclockwise. Screw the side grip on  
either side of the tool, whichever is convenient.  
Installing or removing the bit  
003153  
Press in the tool retainer and turn it until the red dots on the  
tool retainer and the tool holder are aligned. Release the tool  
retainer.  
1
2
1. Red dot (Tool holder)  
2. Rde dot (Tool retainer)  
003154  
Insert the bit into the tool holder as far as it will go. Press in  
the tool retainer and turn it a full 180 degrees. Then release it  
to secure the bit.  
1
3
2
To remove the bit, follow the installation procedure in reverse.  
1. Tool retainer  
2. Turn 180°  
3. Press in  
8
 
003183  
Depth gauge  
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.  
1
3
NOTE:  
2
The depth gauge cannot be used at the position where  
the depth gauge strikes against the tool body.  
1. Clamp screw  
2. Depth gauge  
3. Grip base  
OPERATION  
003199  
Hammer drilling operation  
Set the change lever 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  
9
 
003205  
Chipping/Scaling/Demolition  
Set the change lever 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.  
Core bit (optional accessory)  
When using the center bit  
003209  
Screw the core bit on the adapter. Install the adapter with the  
core bit in the tool in the same manner as a drill bit.  
1
2
1. Core bit  
2. Adapter  
003210  
Install the center bit.  
1
1. Center bit  
003211  
Rest the core bit on the concrete and turn the tool on. Once  
the core bit has cut a shallow groove into the concrete,  
remove the center bit. Then resume drilling.  
10  
 
To remove the core bit, follow the procedures 1 or 2.  
003213  
1. Rotate the change lever to the  
position. Then rest  
the core bit on the concrete and turn the tool on. The  
core bit will come loose from the hammering action.  
003215  
2. Hold the adapter with the wrench, insert the rod (optional  
accessory) into the hole in the core bit and tap with a  
hammer to unscrew.  
1
1. Rod  
003216  
When not using the center bit  
1
2
Screw the core bit on the adapter. Install the adapter with the  
core bit in the tool in the same manner as a drill bit.  
1. Core bit  
2. Adapter  
003211  
Rotate the change lever to the  
position. Rest the core bit  
on the concrete and turn the tool on. Once the core bit has  
cut a shallow groove into the concrete, rotate the change  
lever to the  
position and resume drilling.  
NOTE:  
No problem is caused even if the core bit unscrews  
slightly during brief use since the core bit rotates in the  
tightening direction.  
To remove the core bit, follow the same removal procedures  
covered in “When using the center bit”.  
MAINTENANCE  
CAUTION:  
Always be sure that the tool is switched off and  
unplugged before attempting to perform inspection or  
maintenance.  
11  
 
001146  
Replacing carbon brushes  
When the resin insulating tip inside the carbon brush is  
exposed to contact the commutator, it will automatically shut  
off the motor. When this occurs, both carbon brushes should  
be replaced. 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.  
2
3
1
1. Commutator  
2. Insulating tip  
3. Carbon brush  
003225  
Use a hex wrench to remove the rear cover.  
1
2
1. Hex wrench  
2. Rear cover  
003231  
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.  
1
2
1. Screwdriver  
2. Brush holder cap  
Lubrication  
003236  
This tool requires no hourly or daily lubrication because it  
has a grease-packed lubrication system. It should be relubri-  
cated after every 6 months of operation. Send the complete  
tool to Makita Authorized or Factory Service Center for this  
lubrication service. However, if circumstances require that  
you should lubricate it by yourself, proceed as follows.  
1
2
Run the tool for several minutes to warm it up. Switch off and  
unplug the tool.  
1. Lock nut wrench  
2. Crank cap  
Remove the crank cap using a Makita lock nut wrench 35  
(optional accessory). Rest the tool on the table with the bit  
end pointing upwards. This will allow the old grease to collect  
inside the crank housing.  
12  
 
Wipe out the old grease inside and replace with a fresh  
grease (60 g; 2 oz). Use only Makita genuine hammer  
grease (optional accessory). Filling with more than the spec-  
ified amount of grease (approx. 60 g; 2 oz) can cause faulty  
hammering action or tool failure. Fill only with the specified  
amount of grease.  
Reinstall the crank cap and tighten with the lock nut wrench.  
CAUTION:  
Do not tighten the crank cap excessively. It is made of  
resin and is subject to breakage.  
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.  
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.  
Spline shank Carbide-tipped bits  
Bull point  
Cold chisel  
Scaling chisel  
Grooving chisel  
Spline shank to A-Taper adapter  
Spline shank to SDS adapter  
Core bit  
Core bit adapter  
Hammer grease  
Depth gauge  
Blow-out bulb  
Safety goggles  
Lock nut wrench 35  
Hex wrench  
Plastic carrying case  
13  
 
Memo  
14  
 
Memo  
15  
 
Memo  
16  
 
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  
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3. How did you learn about this product:  
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)
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)
2. Use of the product is intended for:  
4. Most favored points are:  
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5. Any comments:  
DATE PURCHASED  
MONTH  
MODEL NO.  
DAY  
YEAR  
SERIAL NO.  
STATUS  
SEX  
Married Single  
M
F
INTL.  
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AGE:  
BE SURE TO COMPLETE THE CUSTOMER’S 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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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.  
19  
 
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  
Makita's 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  
"MERCHANTABILITY" AND "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 form 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  
883481F063  
 

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