Makita HR2400 User manual

Rotary Hammer
Capacities
In concrete In wood In steel
24 mm (15/16") MODEL HR2400
Variable Speed
No load speed 1 Blows I E;;: 1 Net
(RPM) per minute weight
INSTRUCTION MANUAL
24 mm
(15/16")
DOUBLE
INSULATION
38 mm (l-l/2'') 13 mm 333 mm 2.3 kg
See note 3 below. (112") - 1r200 - 4,200 (13-1/8") (5 Ibs)
SPECIFICATIONS
Note 1. Manufacturer reserves the right to change specifications without notice.
2. Specifications may differ from country to country.
3. When using a flat boring bit.
WARNING: For your personal safety, READ and UNDERSTAND before using.
SAVE THESE INSTRUCTIONS FOR FUTURE REFERENCE.

IMPORTANT
SAFETY INSTRUCTIONS
(For All Tools)
WARNING:
WHEN USINGELECTRICTOOLS, BASICSAFETY
PRECAUTIONSSHOULDALWAYS BE FOLLOWED TO REDUCE
THE RISK
OF FIRE, ELECTRIC SHOCK, AND PERSONAL
INJURY, INCLUDING THE FOLLOWING:
READ ALL INSTRUCTIONS.
1.
2.
3.
4.
5.
6.
7.
8.
9.
IO.
11.
12.
13.
2
KEEP WORK AREA CLEAN. Cluttered areas and benches invite injuries.
CONSIDER WORK AREA ENVIRONMENT. Don't use power tools
in damp
or wet locations. Keep work area well
lit. Don't expose power tools torain.
Don't use tool
in presence of flammable liquids or gases.
KEEP CHILDREN AWAY. All visitors should be kept away from work area.
Don't let visitors contact tool or extension cord.
STORE IDLETOOLS. When not
in use, tools should bestored in dry, andhigh
or locked-up place - out of reach of children.
DON'T FORCETOOL.
It will do thejob better and safer at theratefor which
it was intended.
USE RIGHTTOOL. Don't force small tool or attachment todo thejob of a
heavy-duty tool. Don't use tool for purpose not intended.
DRESS PROPERLY. Don't wear looseclothing or jewelry. Theycanbecaught
in moving parts. Rubber gloves and non-skid footwear are recommended
when working outdoors. Wear protective hair covering to contain long hair.
USE SAFETY GLASSES. Also use face
or dust mask if cutting operation is
dusty.
DON'T ABUSE CORD. Nevercarry toolby cordor yank
it todisconnect from
receptacle. Keep cord from heat, oil, and sharp edges.
SECURE WORK. Use clamps or a vise to hold work. It's safer than using
your hand and
it frees both hands to operate tool.
DON'T OVERREACH. Keep proper footing and balance at all times.
MAINTAIN TOOLS WITH CARE. Keep tools sharp and clean for better and
safer performance. Follow instructions for lubricating and changing acces-
sories. Inspecttool cords periodicallyandif damaged, have repairedby autho-
rized service facility. Inspect extension cords periodically and replace if
damaged. Keep handles dry, clean, and free from oil and grease.
DISCONNECTTOOLS. When not
in use, beforeservicing, and when chang-
ing accessories, such as blades, bits, cutters.

14. REMOVEADJUSTING KEYS AND WRENCHES. Form habit of checking to
seethatkeysandadjusting wrenches are removed from tool beforeturning
it on.
15. AVOID UNINTENTIONALSTARTING. Don’t carry plugged-intool withfinger
on switch. Be sure switch is OFF when plugging
in.
16. OUTDOOR USEEXTENSIONCORDS. Whentool is usedoutdoors, use only
extension cords intended for use outdoors and
so marked.
17. STAY ALERT. Watchwhat youare doing, usecommonsense. Don’t operate
tool when you are tired.
18. CHECK DAMAGED PARTS. Beforefurther use of the tool, a guard or other
part that is damaged should be carefully checked to determine that
it will
operate properlyand performitsintended function. Check for alignment of
moving parts, binding of moving parts, breakage of parts, mounting, and
any other conditions that may affect its operation. A guard or other part
that is damaged should be properly repaired or replaced by an authorized
service center unless otherwise indicated elsewhere
in this instruction
manual. Havedefective switches replacedby authorized servicecenter. Don’t
use tool
if switch does not turn it on and off.
19. GUARD AGAINST ELECTRIC SHOCK. Prevent body contact withgrounded
surfaces. For example; pipes, radiators, ranges, refrigerator enclosures.
20. REPLACEMENTPARTS.When servicing, useonly identicalreplacementparts.
21. POLARIZEDPLUGS. To reducetherisk of electric shock, thisequipment has
a polarized
plug (one blade is wider than the other). This plug will fit in a
polarized outlet only one way.
If the plug does not fit fully in the outlet,
reverse the plug.
If it stilldoes not fit, contact a qualifiedelectriciantoinstall
the proper outlet. Do not change the plug
in any way.
VOLTAGE WARNING: Before connectingthe tooltoa powersource (receptacle,
outlet, etc.) be sure the voltage supplied is the same as that specified on the
nameplate of the tool. A power source
with voltage greater than that specified
for the tool can result inSERIOUS INJURY to the user
- as well as damage to
the tool.
If indoubt, DO NOT PLUG INTHE TOOL. Using a power source with
voltage less than the nameplate rating is harmful to the motor.
3

ADDITIONAL SAFETY RULES
1. Wear a hardhat (safety helmet),safety glasses andlor face shield. It isalso
highlyrecommendedthat you wear adust mask, ear protectors and thickly
padded gloves.
2. Be sure the bit is secured in place before operation.
3. Under normaloperation, thetoolisdesigned toproducevibration. The screws
can come loose easily, causing a breakdownor accident. Check tightness
of screws carefully before operation.
4. In cold weather or when the tool has not beenusedfor a longtime, let the
tool warm up for several minutes by operating
it under no load. This will
loosen
up the lubrication. Without proper warm-up, hammering operation
is difficult.
Be sure no one is below when using the tool
in high locations.
5. Always be sure you have a firm footing.
6. Hold the tool firmly with both hands.
7. Keep hands away from moving parts.
8. Do not leave the tool running. Operate the tool only when hand-held.
9. Do not point the tool at any one in the area when operating. The bit could
fly out and injure someone seriously.
IO. When drillingor chipping intowalls, floors or wherever "live" electricalwires
may be encountered,
DO NOT TOUCH ANY METAL PARTS OF THE TOOL!
Holdthe tool by the insulated grasping surfaces to prevent electric shock
if you drill or chip into a "live" wire.
1 1. Do not touch the bit or parts close to the bit immediately after operation;
they may be extremely hot and could burn your skin.
SAVE THESE INSTRUCTIONS.
4

Side grip (auxiliary handle)
The side grip swings around to either side,
allowing easy handling
of the tool in any
position. Loosen the wing bolt on the side
grip and swing the side grip to the desired
position. Then tighten the wing bolt to
secure the side grip.
Wing bolt /
Installingor removingdrill bit
CAUTION :
Always be sure that the tool is switched off and unplugged before installing or removing
the bit.
To installthe bit, turn the change ring inthe
direction
of the arrow until the I mark
on the change ring
is aligned with the
mark on the rubber cap. Align the key
groove on the bit shank with the
I mark
on the rubber cap and insert the bit.
Turn the change ring in the direction
of the
arrow until the
1 mark on the change
ring
is aligned with the 0 mark on the
rubber cap to secure the bit.
Rubber cap C’hange ring

Depthgauge
The depth gauge
is convenient for drilling
holes of uniform depth. Insert the depth
gauge into the hole in the grip. Adjust the
depth gauge to the desired depth and then
tighten the wing bolt to secure the depth
gauge.
NOTE
:
The depth gauge cannot be used at the position where the depth gauge strikes against
the gear housing.
Switch action
Tool speed
is increased by increasing pres-
sure on the trigger. To start the tool,
simply pull the trigger.
Release the trigger
to stop. For continuous operation, pull the
trigger andthen slide the lock lever upward.
To stop the tool from the locked position,
pull the trigger fully, then release
it.
.
CAUTION :
Before plugging in the tool, always check to see that the trigger switch actuates properly
and returns to the "OFF" position when released.
Reversingswitch action
This tool has
a reversing switch to change
the direction of rotation. Press the upper
side (FWD side) of the switch for clockwise
rotation or the lower side (REV side) of
the switch for counterclockwise rotation.
Reversing
switch
CAUTION :
.Always check the direction of rotationbefore operation.
.Use the reversing switch only after the tool comes to
a complete stop. Changing the
direction of rotationbefore the tool stops may damage the tool.
6

Selecting action mode
This tool employs an action mode chang-
ing knob. Select one of three modes suit-
able for your work needs by using this
knob. For rotation only, turn the knob
so
that the arrow on the knob points toward
the
- mark on the tool body. For ham-
mering only, turn the knob
so that the
arrow on the knob points toward the
b
mark on the tool body. For rotation with
hammering, turn the knob
so that the
arrow on the knob points toward the
mark on the tool body.
Lion mode
changing knob
CAUTION :
The action mode changing knob may not be turned to your desired mode mark when the
tool
is not running. In this case, pull the trigger switch half-way and turn the knobwhile
the tool
is running under no load at low speed.
Torque limiter
The torque limiter will actuate when a certain torque level is reached. The motor will dis-
engage from the output shaft. When this happens, the bitwill 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.
Hammer drilling operation
Position the bit at the desired location for the hole, then pull the 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, runthe tool
at an idle,then remove the bitpartially 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 breakthrough, 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.
7

Bitgrease
Coat the bitshank head beforehand with
a small amount (about 0.5- 1 g; 0.02 -0.04 oz.)
of bitgrease. This chuck lubrication assures smooth actionand longer service life.
Using cold chisel or bullpoint
When using optional cold chisel or bull point, proceed
as follows.
1. Unplugthe tool.
2. Remove the side grip from the tool.
3. Set the action mode changing knob to "rotation with hammering".
4. Install the chisel on the tool. Refer to "installing or removing drill bit" described on
the previous page.
5. Install the chisel adapter (optional accessory) on the tool
so that the chisel is inserted
through the chisel adapter.
Chisel adapter Chjsel
\ Clamper
\/ I
Tool
6. Rotate the chisel so that the chisel faces toward the direction suitable for your work.
Then secure the chisel and chisel adapter to the tool using the clamper on the chisel
adapter.
7. Set the action mode changing knob to "hammering only". Now you can use the chisel.
8. To remove the chisel, follow the installationprocedures in reverse.
CAUTION
:
Always use "hammering only" action when the chisel adapter is installed on the tool. If
you use "rotation with hammering" or "rotation only",
a malfunction and damage to the
tool will result.
Dust
cup
Use the dust cup to prevent dust from fall-
ing over the tool and on yourself when
performing overhead drilling operations.
Attach the dust cup to the bit
as shown in
the figure. The dust cup can be attached to
the bit up to 14.5 mm
(9/16") in diameter.
8

Drilling in wood or metal
Use the optional drill chuck assembly (con-
sisting of drill chuck and chuck adapter
assembly). When installing it, refer to "in-
stalling or removing drill bit" described
on
the previous page. Set the action mode
changing knob to "rotation only".
You can
drill up to 13 mm (1/2") diameter in metal
and up to
38 mm (1-1/2") diameter in
wood.
(Note
: When using a flat boring bit.)
CAUTION
:
Secure the drill chuck in a vise or similar
securing devise. Place the chuck key in
one of the three holes
so that the chuck
body will not turn.
I
\
Drill chuck
'
Wrench
Chuckkey
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
reversingthe tool.
Remove the screw from the chuck adapter assembly and screw the chuck adapter into
the drill chuck. Use
a wrench to tighten the chuck adapter securely, applying about 300-
400 kgf . cm (21.6-28.9 Ib . ft) torque. [Note: you can obtain 300-400 kgf . cm (21.6-
28.9
Ib . ft) torque by applying pressure of 30-40 kg (66-88 Ibs) to the wrench while
holding the portion 10 cm
(4") form the wrench head.]
Open the chuck jaws fully and insert the
I 1
I -'I
I IyllLeII
9

MAINTENANCE
CAUTION :
Always be sure that the tool is switched off and unpluggedbefore attempting to perform
inspection or maintenance.
Sharpening tungsten-carbide tip bit
When your bit becomes dull, use an ordinary bench grinder with a wheel made of silicon
carbide to resharpen
it.
0 Be sure to maintain the original angles of the tip. Especially without 60' chamfering,
0 Do not quench the bit in water or oil.
Do not grind the sides B and C.
- CAUTION:
the tungsten-carbide tip may be damaged.
0.5
A - A' Cross section
To maintain product SAFETY and RELIABILITY, repairs, carbon brush inspection and
replacement, any other maintenance or adjustment should be performed by Makita
Authorized or Factory Service Centers, always using Makitareplacement parts.
10

ACC ESSO R I ES
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.
The accessories or attachments should
be used only in the proper and intended manner.
711156-A
711158~A
711161~A
711162-A
711165-A
711168-A
711169~A
711172-A
711173-A
711174-A
0 Tungsten-carbidetip bits
~~
318" 12"
7116" 6"
1 /2" 6"
112" 12"
9116" 6"
518" 8"
518" 12"
11/16" 8"
3/4" 8"
314" 12"
Part No. Diameter Overall length
711142~A 3116"
711143~A 1/16"
711147-A 114''
711148-A 1/4"
711152~A 5/16"
711155-A
318"
I
711176A I 718'' I R"
0 Hammer grease 30 g; 1 02.
Depthgauge
Part No. 181490-7
0 Bitgrease 100 g; 3.5 02.
Part No. 181573-3
0 Steel carrying case
Part No. 181872-3
0 Chuck key S13
Part No. 763411-7
0 Drillchuck S13
Part No. 763047-2
1
0 Chuck adapter
Part
No. 122331-8
Part
No. 321144-6
-
0 Dust cup
Part
No. 421342-3
0 Gripassembly
Part
No. 134715-8
0 Safety goggle
Part
No. 191686-2
0 Chisel adapter assembly
Part
No. 122460-7
11

0 Bull point Cold chisel
Part No. 798380-3 Part
No. 798379-8
12

May-06--'93 US
24 mm (15/16")
ROTARY HAMMER
Model HR2400
Note: The switch, noise suppressor and other part configurations
may differ from country to country.
13

MODEL HR2400
';,'OM $.& DESCRIPTION
ITEM NO.
NO.
USED
May-06-'93 US
DESCRIPTION
MACHINE
~
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
30
39
1
1
1
1
1
4
1
1
1
1
1
1
1
1
1
1
1
2
1
2
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
-
Cap 37
Change Ring
Cover
Grip
Hex Nut M6
Gear Housing
Pan Head
Screw M5x50 lWithWasher]
0 Ring 67
Change
Ring
Sled Ball 7 1
Ring 20
Ball Bearing 6904LLU
011 Seal 28
Ring Spring 28
Flat Washer 31
Compression Spring 31
Spur Gear 46
0 Ring 10
Roller 7
Tool Holder
Flat Washer 29
0 Ring 10
0 Ring 10
Impact
Bolt
Idler
Rubber Ring 17
Name Plate
Motor Housing
Hex 8011M4x55 lWithWasher1
Thrust Needle
Bearing 819
Helical Gear 31
Swash
Bearing 9
tam Shaft
Clutch
Spur
Gear 10
Change
Lever
0 Ring 17
Pan Head
Screw M4
Screw 6x40
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
76
77
-
E
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
2
1
6
1
1
2
1
1
1
1
1
-
Flat Washer 12
Pision Joint
Flat Washer 12
Flat Washer 13 5
Ring Spring 23
Striker
0 Ring 16
Piston Cylinder
Gear Housing Cover
0 Ring 24
Ball Bearing 609LL8
011 Seal 12
Fan 60
ARMATURE ASSEMBLY
(With
Item 52 ~ 551
Insulation Washer
Ball Bearing 608LL8
Flat Washer 14
Baffle Plats
Field
Compression Spring
3
Carbon Brush
Switch
Lock Plate
Switch
Lever
Lock Button
Rubber Pin 4
Handle Cover
Tapping
Screw 4x18
Dust Cover
Switch
Tapping Screw 4x18
Strain Relief
Cord
Cord Guard
Compression Spring
6
Push Cone
Note' The switch
and other part spe~ifi~ations may differ from country to country.
14

MAKITA LIMITED ONE YEARWARRANTY
Warranty Policy
Every Makita tool is thoroughly inspected and tested before leavingthe factory. It is warranted to
be free of defects from workmanship and materials forthe 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 ServiceCenters. 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 attemptedby 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 CON-
SEQUENTIAL DAMAGFS FROM THE SALE OR USE OFTHE PROD’UCT. THIS DISCLAIMER
APPLIES BOTH DURING AND AFTER THF TERM OFTHIS WARRANTY.
MAKITA DISCLAIMS LIABILITY FOR ANY IMPLIED WARRANTIES, INCLUDING IMPLIED
WARRANTIES OF “MERCHANTABILITY” AND “FITNESS FOR A SPECIFIC PURPOSE,”
AFTER THE ONE-YEAR TERM OFTHIS 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 longanimplied warranty lasts, so the above limitation may not apply to you.
Makita Corporation
3-11 -8, Sumiyoshi-cho,
Anjo, Aichi
446 Japan
883824 - 069
PRINTED IN JAPAN
1993 - 6 - N