Makita N900 User manual

Angle Grinder
No load speed Overall length Net weight
(RPM)
100 mm (4”) MODEL N900
Spindle thread
INSTRUCTION MANUAL
10,000 1 255 mm (10”) 1 1.5 kg (3.3 lbs) 1 MlOx 1.25
Manufacturer reserves the right to change specifications without notice.
Note: Specifications may differ from country to country.
WARNING: For your personal safety, READ and UNDERSTAND before using.
SAVE THESE INSTRUCTIONS
FOR FUTURE REFERENCE.

IMPORTANT
SAFETY INSTRUCTIONS
(For All Tools)
WARNING: WHENUSINGELECTRICTOOLS, BASICSAFETY
PRECAUTIONSSHOULDALWAYS BE FOLLOWEDTO REDUCE
THE RISK OF FIRE, ELECTRIC SHOCK, AND PERSONAL
INJURY, INCLUDINGTHE FOLLOWING:
READ ALL INSTRUCTIONS.
1. KEEP WORK AREA CLEAN. Cluttered areas and benches invite injuries.
2. CONSIDER WORK AREA ENVIRONMENT. Don't use power tools in damp
or wet locations. Keep work area well
lit. Don't expose power tools to rain.
Don't use tool in presence of flammable liquids or gases.
3. KEEP CHILDREN AWAY. All visitors should be kept away from work area.
Don't let visitors contact tool or extension cord.
4. STORE IDLETOOLS. When not in use, tools should bestored in dry, and high
or locked-up place - out of reach of children.
5. DON'T FORCETOOL. It will dothejob better and safer attheratefor which
it was intended.
6. USE RIGHT TOOL. Don't force small tool or attachment todo thejob of a
heavy-dutytool. Don't usetoolfor purpose notintended; for example, don't
use circular saw for cutting tree limbs or logs.
7. DRESS PROPERLY. Don't wear looseclothingorjewelry. They canbecaught
in moving parts. Rubber gloves and non-skid footwear are recommended
whenworking outdoors. Wear protective hair covering tocontain long hair.
8. USE SAFETY GLASSES. Also use face or dust mask if cutting operation is
dusty.
9. DON'T ABUSE CORD. Nevercarry toolbycord or yank it todisconnect from
receptacle. Keep cord from heat, oil, and sharp edges.
IO. 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.
11. DON'T OVERREACH. Keep proper footing and balance at all times.
12. MAINTAIN TOOLS WITH CARE. Keep tools sharp and clean for better and
safer performance. Follow instructions for lubricating and changing acces-
sories. Inspecttoolcordsperiodicallyandifdamaged, haverepairedbyautho-
rized service facility. Inspect extension cords periodically and replace if
damaged. Keep handles dry, clean, and free from oil and grease.
13. DISCONNECTTOOLS. Whennot in use, before servicing, and whenchang-
ing accessories, such as blades, bits, cutters.
2

14. REMOVE ADJUSTING KEYS AND WRENCHES. Form habit of checking to
seethat keys andadjusting wrenches are removed from toolbeforeturning
it on.
15. AVOID UNINTENTIONALSTARTING. Don't carrytool with finger onswitch.
Be sure switch is OFF when plugging
in.
16. EXTENSION CORDS. 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
inlinevoltage resulting
in loss of power andoverheating. Table 1 showsthe
correct size touse depending oncord lengthandnameplateampere rating.
If in doubt, use the next heavier gage. The smaller the gage number, the
heavier the cord.
TABLE 1 MINIMUM GAGE FOR CORD SETS
Ampere Rating
More Not More
Than Than
Total Length
of Cord in Feet
0 - 25 26 - 50 51 - 100 101 - 150
AWG
0- 6
6 - 10
10 - 12
12 - 16
~______ ~
17. OUTDOOR USE EXTENSIONCORDS. Whentool isusedoutdoors, use only
extension cords intended for use outdoors and
so marked.
18. STAY ALERT. Watch what youare doing, use commonsense. Don't operate
tool when you are tired.
19. CHECK DAMAGED PARTS. Before further use of the tool, a guard or other
part that is damaged should be carefully checked to determine that it will
operate properly and perform itsintendedfunction. Check for alignment of
movingparts, bindingof movingparts, breakageof parts, mounting, andany
other conditions that may affect its operation. A guard or other part that
is damaged should be properly repaired or replacedby an authorized serv-
icecenter unless otherwise indicated elsewhere
in this instruction manual.
Have defective switches replaced by authorized service center. Don't use
tool
if switch does not turn it on and off.
20. GUARDAGAINST ELECTRIC SHOCK. Prevent body contact with grounded
surfaces. For example; pipes, radiators, ranges, refrigerator enclosures.
21. REPLACEMENTPARTS. When servicing, useonlyidenticalreplacement parts.
22. POLARIZEDPLUGS. To reduce the riskof electric shock, this equipment 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,
reversethe plug.
If it still does not fit, contacta qualifiedelectriciantoinstall
the proper outlet.
Do not change the plug in any way.
18 16 14
16 16 14 12
14 12
Not Recommended
18 16 ;: 1 12
3

VOLTAGE WARNING: Before connectingthetooltoa powersource (receptacle,
outlet, etc.) be sure the voltage supplied
is the same as that specified on the
nameplateof the tool.
A power source with voltage greater than that specified
for the toolcan result
in SERIOUS INJURY to the user - as well as damageto
the tool. If
in doubt, DO NOT PLUG INTHE TOOL. Using a power source with
voltage less than the nameplate rating is harmful to the motor.
ADDITIONAL SAFETY RULES
1. Keep guards in place.
2. Use only wheelshavingamaximumoperatingspeedat least as highas "No
Load RPM" markedon the tool's nameplate.When usingdepressed center
wheels, be sure to use only fiberglass-reinforcedwheels.
3. Check the wheel carefully for cracks or damage before operation. Replace
cracked or damaged wheel immediately.
4. Use only flanges specified for this tool.
5. Be careful not to damage the spindle, the flange (especially the installing
surface) or the lock nut. Damage to these parts could result in wheel
breakage.
6. Hold the tool firmly.
7. Keep hands away from rotating parts.
8. Make sure the wheel is not contacting the workpiece beforethe switch is
turned on.
9. Before using the tool on an actualworkpiece, let it run for a while. Watch
for vibration or wobbling that could indicate poor installation or a poorly
balanced wheel.
IO. Use the specified surface of the wheel to perform the grinding.
11. Watch out for flying sparks. Holdthe tool so that sparksfly away from you
12. Do not leave the tool running. Operate the tool only when hand-held.
13. Do not touchthe workpieceimmediatelyafter operation; it may beextremely
and other persons or flammable materials.
hot and could burn your skin.
SAVE THESE INSTRUCTIONS.
4

Installing side grip (auxiliary handle)
Screw the same grip on the tool securely.
Installing or removing depressed center wheel
CAUTION:
Always be sure that the tool is switched off and unplugged before installing or removing
the wheel.
Screw the inner flange onto the spindle. Fit
the wheel on over the inner flange and screw
the
lock nut onto the spindle.
Lock nut
Depressed
center wheel
CAUTION:
When installingthe depressed center wheel,
screw the inner flange onto the spindle
so
thatthe side with hub 16 mm (5/8") inout-
er diameter faces toward the depressed
center wheel.
When installing the diamond wheel or
abrasivedisc, screw the innerflange ontothe
spindle
so that the side with hub 20 mm
(25/32") in outer diameterfacestoward the
diamond wheel or abrasive disc.
5

To tighten the lock nut, holdthe spindle with
the wrench
so that it cannot revolve, then
usethe lock nut wrench and securelytighten
clockwise.
Lock nut wenc
If \-wrench
CAUTION:
Useonly the Makita wrench and lock nut wrench provided to install or removethe wheel.
Failure to do
so may result inovertightening or insufficient tightening of the lock nut. This
could cause an injury.
To remove the wheel, follow the installation procedure in reverse.
Switch action
To start the tool, move the slide switch
forward, andthe slide switchwill lock inthe
"ON" position.
To stop lightly depress the
rear of the slide switch, and
it will returnto
the "OFF" position.
Slide switch
I 0
I
CAUTION:
Before plugging in the tool, always check to see that the switch actuates properly and
Be sure to clean the tool often to prevent dust/dirt/abrasive material build-up from inter-
returns to the "OFF" position when depressed.
fering with the smooth operation
of the swtich.
6

Operation
Holdthe toolfirmly. Turn the tool onandwait
until the wheel or disc attains full speed.
Then apply the wheel or disc to the work-
piece. Ingeneral, keep the edge of the wheel
or disc at an angle of about
15' tothe work-
piece surface.
Duringthe break-inperiodwith anew wheel,
do not work the grinder inthe
B direction or
it will cut into the workpiece.Oncethe edge
of the wheel has been rounded off by use,
the wheel may be worked in both A and
B
directions.
WARNING:
I
I
It should never be necessary to force the tool. The weight of the tool applies adequate
pressure. Forcing and excessive pressure could cause dangerous wheel breakage.
Continued use of a worn-out wheel may result in wheel explosion and serious personal
injury. Depressed center wheel should not be used after
it has been worn down to 75
mm (3") indiameter.Useof the wheel after this point is unsafeand it should be removed
from service and rendered unusable by intentional destruction.
Abrasive disc (optional accessory)
Installthe abrasive disc onthe tool as shown
in the figure. Tighten the lock nut securely
with the wrench and lock nut wrench.
Lock nut
----a
Abrasive disc
-
Rubber pad
1 Inner flange -&
7

MAINTENANCE
CAUTION:
Always be sure that the tool is switched off and unplugged before attempting to perform
inspection or maintenance.
To maintainproduct SAFETY and RELIABILITY, repairs, carbonbrushinspectionand replace-
ment, any other maintenance or adjustment should be performed by Makita Authorized or
Factory Service Centers, always using Makita replacement parts.
8

ACCESSORIES
CAUTION:
These accessoriesor attachments are recommendedfor use with your Makita tool specified inthis
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.
Part No.
@Wheel cover
Part No. 344257-6
Grit Wheels
per pkg.
Size
fmm)
@Depressed center wheels
100x4~16
@Lock nut 10-35
Part No. 224545-6
@Inner flange 35
Part No. 224291-1
@Multi-disc
- I
742038-00 100
@Rubber pad 76
Part No. 743009-6
9

@Abrasive discs
Grit
741404-OBP AC46
Part
No. Size lmm)
742036-0-3
742037-8-3
Wheels
10
per Pkg.
742038-6-3
@Cut-off wheel
@Lock nut
10 - 30
(For abrasive disc)
Part
No. 224501-6
@Wire cup brush
75
Part No. 743201-4 @Wire bevel brush
85
Part No. 743203-0
@Grip holder
Part
No. 164329-9 @Wheel guard assembly
(For cut-off wheel)
Part
No. 122363-5
@Flex wheel
741404-OCP
741404-ODP ACE0
741404-OFP AC120
741404-ODP ACE0
I 10
741404-OFP AC120 10
@Inner flange 30
(For flex wheel)
Part
No. 224278-3
@Plastic pad
(For flex wheel)
Part
No. 743009-1A
Wrench 0 14
Part No. 781007-2
@Lock nut
10 - 30
(For flex wheel)
Part
No. 224541-4
Lock nut wrench 20
Part No. 782401-1
@p-
Grip 36
Part No. 273506-3
10

100 mm (4")
ANGLE GRINDER
Model N900
Note: The switch and other part configurations
may differ from country
to country.
11

MACHINE
~
16
17
18
19
20
21
22
24
25
26
27
28
29
E02
E03
1
1
1
2
1
1
1
1
1
1
1
1
6
1
1
0 Ring 11
Needle Bearing 810
Rstainmg Ring S- 12
Spiral Bevel Gear 36
Ball Bearing 6201LB
Flat Washer 12
Spindle
Wheel Cover
Pan Head Screw M5x20 IWith Washer)
Inner Flange 30
Lock Nut 10-30
Woodruff Key 3
Spiral Bevel Gear 11
Ball Bearing 6WOLB
Fan
52
10
11
12
13
14
15
11
21
31
41
51
61
71
81
92
1
1
1
1
1
1
ARMATURE ASSEMBLY lWlth Item 14 .
Ball Bearing 627LL8
Field
Carbon Brush
Terminal Base Complete
Housing
Set IWith Item 271
Cord
Switch
Switch Lever
Compression Spring
6
Housing Set (With Item 211
Name Plate
Pan Head Screw M4x30 (With Washer)
Grip Holder
Grip
36
Note: The switch and other part specifications may differ from country to country
MAKKA LIMITED ONE YEAR WARRANTY
Warranty Policy
Every Makrta tool is thoroughlyinspected and tested before leaving the factory. It is warranted to
be free
of defects from workmdpand materials for the period of ONE YEAR from the date of
on@ purchase. Should any trouble develop during this one-yearperiod, return the COMPLETE
twl, freight prepaid,
to one of Makita’s Factory or Authorized Service Centers. If inspeetion shows
the trouble
is caused by defective workmanship or material, Makita will repair (or at our option,
replaee) without charge.
This Wananty does not apply where:
repairs have been made or attempted by others:
repairs are required becauw of normal wear and tear:
Thetool has been abused, misused or improperly maintained;
alterations have been made tothetool.
IN NO EVENT SHALL MAKITA BE LIABLE FOR ANY INDIRECT, INCIDENTAL
OR CON-
SEQUENTIAL DAMAGES FROM THE SALE
OR USE OFTHE PRODUCT. THIS DISCLAIMER
APPLIESBOTH DURING AND AFTER THE TERM OFTHISWARRANTY,
MAKITA DISCLAIMS LIABILITY
FOR ANY IMPLIED WARRANTIES, INCLUDING IMPLIED
WARRANTIES OF “MERCHANTABILITY” AND “FITNESS FOR A SPECIFIC PURPOSE.”
AFTER THEONE-YEAR TERM OF
THIS WARRANTY.
This Wananty gives you specific legal rights, and you may also have other rights which vary from
state to state.
Some sutado not Puow the exclusion or limitation of incidental or conquential
damages,
so the above limitation or excluaion mynot apply to you. Some states do not allow
limitation onhow
long an implied WU~M(Yhta, so the above limitation may not apply toyou,
171
MAKITA MANUFACTURING EUROPE LTD
TELFORD, SHROPSHIRE, U.K.
883729-063