Makita HR1821 User manual

(3/4")

MODEL

HR1821

Variable

Speed

Capacities

Wood Steel Concrete

15"

10" 19"

(518") (3/8") (314"

INSTRUCTION MANUAL

No load Blows Overall Net

speed per minute length weight

;/A,i:OO

3,500 321

3.1 kg

(12-518") (6.8

Ibs)

IMPORTANT

SAFETY INSTRUCTIONS

(For

All

Tools)

WARNING:

WHEN USING ELECTRIC TOOLS, BASIC SAFE-

REDUCE THE RISK OF FIRE, ELECTRIC SHOCK, AND PER-

TY PRECAUTIONS SHOULD ALWAYS BE FOLLOWED TO

SONAL INJURY, INCLUDING THE FOLLOWING:

READ

ALL INSTRUCTIONS.

IO.

11.

12.

13.

KEEP WORK AREA CLEAN. Cluttered areas and benches invite injuries.

CONSIDERWORK AREA ENVIRONMENT.Don’t use power tools in damp

or wet locations. Keepwork area well

lit.

Don‘t exposepower 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 IDLE TOOLS. When not

use, tools should be stored in dry, and

high or locked-up place

out of reach of children.

DON’T FORCETOOL.

will

dothejob betterandsaferattheratefor which

was intended.

USE RIGHT TOOL. Don’t force small tool or attachment to do the job of

heavy-duty tool. Don’t use tool for purpose not intended.

DRESSPROPERLY. Don’t wear looseclothingorjewelry.They can becaught

in movingparts. Rubber gloves and non-skid footwear are recommended

whenworking outdoors. Wear protective haircoveringtocontainlonghair.

USE SAFETY GLASSES. Also use face or dust mask if cutting operation

is dusty.

DON’T ABUSE CORD. Never carrytoolby cord or yank

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

frees both hands to operate tool.

DON’T OVERREACH. Keep proper footing and balance at all times.

MAINTAIN TOOLS WITH CARE. Keeptools sharp and clean for better and

safer performance. Follow instructionsfor lubricating and changing acces-

sories. Inspect tool cords periodically and if damaged, have repaired by

authorized service facility. Inspectextension cords periodically and replace

if damaged. Keep handles dry, clean, and free from oil and grease.

DISCONNECTTOOLS. When not

use, beforeservicing, and when chang-

ing accessories, such as blades, bits, cutters.

14.

15.

16.

17.

18.

19.

20.

21.

REMOVE ADJUSTING

KEYS

AND WRENCHES. Form habit of checking to

see that keys and adjusting wrenches are removed from tool before turn-

ing

on.

AVOID UNINTENTIONALSTARTING. Don't carry plugged-intool withfinger

on switch. Be sure switch is

OFF

when plugging

in.

OUTDOOR USEEXTENSIONCORDS. Whentool

usedoutdoors, useonly

extension cords intended for use outdoors and

marked.

STAY ALERT. Watch what you are doing, use common sense. Don't oper-

ate tool when you are tired.

CHECK DAMAGEDPARTS. Before further use of the tool,

guard or other

part that is damaged should be carefully checkedto determine that

will

operate properly and perform its intended function. Check for alignment

of movingparts, binding of movingparts, breakageof 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

servicecenter unlessotherwise indicatedelsewhere

thisinstruction manu-

al. Have defective switches replaced by authorized service center. Don't

use tool if switch does not turn

on and off.

GUARDAGAINST ELECTRIC

SHOCK.

Preventbody contact withgrounded

surfaces. For example; pipes, radiators, ranges, refrigerator enclosures.

PROPER GROUNDING. This tool should be grounded while in use to pro-

tect the operator from electric shock.

EXTENSIONCORDS: Useonly three-wire extensioncords which havethree-

prong grounding-type plugs and three-pole receptacles which accept the

tool's plug. Replace or repair damaged or worn cord immediately.

VOLTAGE WARNING: Before connectingthe tool toa power source (receptacle,

outlet, etc.) be sure the voltage supplied is the same as that specified on the

nameplateof the tool. A power source withvoltage greater than that specified

for the tool can result

SERIOUS INJURY tothe user

as well as damage to

the tool. If

doubt, DO NOT PLUG

THE TOOL. Using a power source with

voltage less than the nameplate rating is harmful to the motor.

For all groundedtools with American type plug.

GROUNDINGINSTRUCTIONS: This tool should begrounded while inuse to protect

the

operator

from electric shock. The

tool

equipped with athree-conductorcordand three-prong grounding-

type plug to fit the proper grounding-type receptacle. The green (or green andyellow) conductor

the cord

the

grounding wire. Never connect the green (or green and yellow) wire to a live

terminal. Your unit

for use on

115

volts and has aplugthat

looks

like,Fig. "A".

An adapter Fig. "B" and

"C"

available for connecting Fig. "A"

type

plugstotwo-prong recap

tacles. The green-colored rigid ear, lug, etc., extending from the adapter must be connected to

permanentground, such

a properly groundedoutlet box.

FIG. A FIG.

FIG. C

Adapter

Grounding Blade Cover of Grounded Outlet Box

ADDITIONAL SAFETY RULES

IO.

11.

Wear a hard hat (safety helmet) and an ear protector

necessary.

Be sure the drill 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

screws carefully before operation.

Incold weather or when the tool has not been usedfor a longtime, let

the

tool

warm

for several minutes by operating

under no load. This will

loosen

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. Always use the side grip.

Keep hands away from rotating parts.

not leave the tool running. Operate the tool only when hand-held.

not point the tool at any one in the area when operating. The drill bit

could fly out and injure someone seriously.

When drilling intowalls, floors

wherever ”live” electrical wires may be

encountered,

NOT

TOUCH ANY METAL PARTS

THE TOOL!

Holdthe tool only by the plastic handle or the side grip to prevent electric

shock

you drill into a “live” wire.

nottouchthedrill

bit

or parts closetothe drill bitimmediately after oper-

ation; they may be extremely hot and could burn your skin.

SAVE THESE

INSTRUCTIONS.

HOW

USE

Bitgrease

Coat the drill bit shank head beforehand with

small amount (about

0.5

0.02

0.04

02.)

of bit grease. This chuck lubrication assures smooth actionand longer service

life.

Installingand removingthe drill bit

To install the drill bit, align protrusion

(A)

with the red dot, then align the key

groove on the drill bitshank withthe red

dot and insert thedrill bit. Now turnthe

chuck cover

degrees.

Fig.

*To remove the drill bit, turn the chuck

cover until protrusion

(A)

alignedwith

the reddot. Then slipout the drill bit.

Key-groove

Fig.

Side grip

0The side grip can be swivelled

full

360

degrees. To

set

any desired angle,

unscrew the grip counterclockwise and

swivel tothe desired position.

Then tighten

securely. (Keep the grip

base in the barrel groove before tighten-

ingin place.)

Fig.

Depthrod

.The depth rod

used to drill holes of

uniform depth. Loosen the thumb screw

set

the depth rod

desired position,

then tightenthe thumbscrew.

Fig.

Handlingdust collector

Use the dust collector for safe, sanitary

then fix the dust collector on the end

by turning and applying pressure. Then

secure

by turning the metal retainer

clockwise.

CAUTION:

Empty the dust collector of

its

contents

after drilling every

holes.

overhead operations. Install the drill bit,

Dust

collector

Fig.

How

work switchover mechanism

For Rotation

Hammering:

Press the push rod indCDodirection.

For Rotationonly:

Press the Dush rod in&+direction.

Push

rod

Lb-

CAUTION:

Press the push rod

far

will go.

Failure to do

can cause rapid wear

the switchover mechanism.

Fig.

Switchaction

Tool speed

increased by increasingpres-

sure on the trigger. To

start

the tool,

simply pull the trigger.

Release

the

triggertostop.

Speed

control

screw

Fig.

.A speed control screw

provided

that tool speed (RPM)can be changed

the fully-

pulled trigger position. Turn the speed control screw clockwise

(+)

for higher speed and

counterclockwise

(-)

for lowerspeed.

CAUTION:

Before plugging in the tool, always check to

see

that the triggerswitch actuates properly

and returnstothe

"OFF"

positionwhen released.

Hammerdrilling operation

.Position the drill bit

the location for

the hole, then pull the trigger.

not force the tool. Light pressure

gives

best results. Keep the tool in posi-

tion and prevent

from slipping away

from the hole.

When holes becomeclogged

.Do

not apply more pressure when the

hole becomes clogged with chips or par-

ticles.

Instead, run the tool

idle, then

remove from the hole. By repeating this

several times, the holewill

cleaned out

completely.

Fig.

CAUTION:

When drilling in concrete,

quite possible that the drill bitcouldhit

reinforcingrod

or some other object that could cause

kickback. Although this tool

equipped with

the torque limiter, protect yourself by holdingthe tool firmlywith both hands. (Be sure

the side grip

securedtightly before operation.)

Blow-outbulb

Use the blow-outbulbto clean out the

hole.

Fig.

Anchor settingprocedure

The drill bit has

red markingwhichcan be usedto indicatethe anchor length. Use the

depth rodwhen drilling for setting

number of anchors

the same depth.

marking chor setting tool

Put

plug in the tip of

an anchor and hammer

intoconcrete.

Screw in

bolt for

fastening equipment.

Fig.

Drilling inwoodor metal

Set

the push rodfor “rotation only.”

Then use the drill chuck and chuck

adapter (optional equipment), installing

described in “Installing and removing

the drill bit

(P.

6).”

CAUTION:

not perform “rotation

hammering“

action with the drill chuck, or the chuck

will probablybe damaged.

Drill

chuck

Fig.

MAINTENANCE

CAUTION:

Always

sure that the tool

switchedoff and unpluggedbeforeattemptingtoperform

inspectionand maintenance.

Replacing

carbon

brushes

Both carbon brushes should be replaced

after about

150

hours of use. When the

resin insulating tip inside the carbon

brush

exposed to contact the com-

mutator,

will automatically shut off

the motor. If carbon brushes wear out

too quickly, ask Makita Authorized or

Factory Service Centers to determine

the cause before replacing them. Use

only Makitacarbon brushes.

*Use the screwdriver to remove the brush

holdercap

shown in the figure.

Insulating tip

Fig.

Take out the worn brush, insert the new

one and secure the brush holdercap.

Fig.

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