Makita 906H User manual

n
Collet size
114”
1/4” MODEL 906H
Overall length Net weight
No load speed
(RPM)
30,000 355 mm (14”) 1.9 kg (4.2 Ibs)
INSTRUCTION MANUAL

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.
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 shouldbe stored in dry, and high
or locked-up place - out of reach of children.
5. DON'T FORCETOOL. It willdo thejob better and safer at the ratefor which
it was intended.
6. USE RIGHT TOOL. Don't force smalltool or attachment to do the job of a
heavy-duty tool. Don't use tool for purpose not intended.
7. DRESS PROPERLY. Don't wear looseclothingorjewelry. They canbe caught
in moving parts. Rubber gloves and non-skid footwear are recommended
when working outdoors.Wear protective hair coveringto contain longhair.
8. USE SAFETY GLASSES. Also use face or dust mask if cutting operationis
dusty.
9. DON'T ABUSE CORD. Never carry toolby cordor yank it todisconnectfrom
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. MAINTAINTOOLS WITH CARE. Keep tools sharp and clean for better and
safer performance. Follow instructions for lubricating and changingacces-
sories. Inspecttoolcordsperiodicallyand ifdamaged, have repairedby autho-
rized service facility. Inspect extension cords periodically and replace if
damaged. Keep handles dry, clean, and free from oil and grease.
13. DISCONNECTTOOLS. When not in use, beforeservicing, and whenchang-
ing accessories, such as blades, bits, cutters.
L

14. REMOVE ADJUSTING KEYS AND WRENCHES. Form habit of checking to
see that keys and adjusting wrenches are removed from tool beforeturning
it on.
15. AVOID UNINTENTIONALSTARTING. Don’t carry plugged-intoolwithfinger
on switch. Be sure switch is OFF when plugging
in.
16. OUTDOOR USE EXTENSIONCORDS. Whentool isusedoutdoors, useonly
extension cords intended for use outdoors and
so marked.
17. STAY ALERT. Watchwhat you are doing, use common sense. Don‘t operate
tool when you are tired.
18. 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 itsintended function. Check for alignment of
movingparts, bindingof movingparts, breakageof parts, mounting, and any
other conditions that may affect its operation. A guard or other part that
isdamaged should be properly repaired or replaced by an authorized service
center unlessotherwise indicatedelsewhere
in this instruction manual. Have
defective switches replaced by authorized service center. Don’t use toolif
switch does not turn
it on and off.
19. GUARD AGAINST ELECTRIC SHOCK. Prevent body contact with grounded
surfaces. For example; pipes, radiators, ranges, refrigerator enclosures.
20. PROPER GROUNDING.This toolshould begrounded while in usetoprotect
the operator from electric shock.
21. EXTENSIONCORDS: Useonly three-wire extension cords 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
nameplate of the tool. A power source with voltage greater than that specified
for the tool can result in SERIOUS INJURY to the user - as well as damage to
the tool. If indoubt, DO NOT PLUG IN THE TOOL. Using a power source with
voltage less than the nameplate rating is harmful to the motor.
3

G ROU N DI N G IN STRUCTIONS
ALL GROUNDED, CORD-CONNECTEDTOOLS: Inthe event of a malfunction or
breakdown, grounding provides a pathof least resistancefor electric current to
reduce the riskof electric shock. Thistoolisequipped withanelectric cord hav-
ingan equipment-grounding conductor and a grounding plug. The plug must be
pluggedintoa matching outlet that isproperlyinstalledandgrounded inaccord-
ance with all local codes and ordinances.
Donotmodify the plugprovided
- if it willnot fit the outlet, havethe proper out-
let installed by a qualified electrician.
Improperconnection of the equipment-grounding conductor can result
in a risk
of electric shock. The conductor withinsulation havingan outer surface that is
green with or without yellow stripes isthe equipment-grounding conductor. If
repair or replacement of the electric cord or plug is necessary, do not connect
the equipment-grounding conductor to a live terminal.
Check withaqualifiedelectricianor serviceman if the groundinginstructionsare
not completely understood, or if in doubt as to whether the tool is properly
grounded.
This tool is intended for use on a circuit that has an outlet that looks like the
one illustratedinFigure
A. The tool has agrounding plugthat looks likethe plug
illustrated
in Figure A. A temporary adapter, which looks like the adapter illus-
trated
in Figure B andC, may be usedtoconnectthis plugtoa 2-pole receptacle
as showninFigure
B if a properly grounded outlet isnotavailable. The temporary
adapter shouldbe usedonly
until a properlygrounded outlet can be installed by
a qualified electrician. The green-colored rigid ear,
lug, etc. extending from the
adapter mustbe connectedtoapermanent ground such as a properly grounded
outlet box.
GROUNDING METHODS
FIG. A FIG. B FIG. C
__ Cover of Grounded -
Outlet Box
GroundingPin
4
Grounding
Means

ADDITIONAL SAFETY RULES
1. Useonly wheels havingamaximumoperatingspeed atleastas high as "No
2. Check the wheel carefully for cracks or damage before operation. Replace
3. Hold the tool firmly.
4. Keep hands away from rotating parts.
5. Before using the tool on an actual workpiece, let it run for more than one
minute. (Whenmountinganew wheel, let
it runfor morethanthree minutes.)
Watch for vibration or wobbling that could indicate poor installation or a
poorly balanced wheel.
6. Watch out for flying sparks. Holdthe tool so that sparks fly away from you
and other persons or flammable materials.
7. Do not leave the tool running. Operate the tool only when hand-held.
8. Always besure you haveafirm footing. Be sure noone is below when using
9. Do not use water or grinding lubricant.
Load
RPM" marked on the tool's nameplate.
cracked or damaged wheel immediately.
the tool in high locations.
IO. Do not use this tool as cutter.
11. Do not touchthe workpiece immediately after operation; it may beextremely
hot and could burn your skin.
SAVE THESE INSTRUCTIONS.
5

Installingor removingwheel point
CAUTION :
Always be sure that the tool is switched off and unplugged before installing or removing
the wheel point.
Loosen the collet nut and insert the wheel
point into the collet nut. Use the smaller
wrench to hold the spindle and the larger
one totighten the collet nut securely.
,
The wheel point should not be mounted
more than
10 mm (3/8") from the collet
nut.
Exceeding this distance could cause vibra-
tion or
a broken shaft.
I +t- 10 mm (3/8")
To remove the wheel point, follow the installation procedure in reverse.
To start the tool, move the switch lever to
the "ON" position. To stop, move the
switch lever tothe
"OFF" position.
I
Switch lever
I I
6

Operation
Turn the tool on without the wheel point
making any contact with the workpiece
and wait until the wheel point attains full
speed. Then apply the wheel point to the
workpiece gently.
To obtain a good finish,
move the tool in the leftward direction
slowly.
CAUTION
:
Apply light I:
sure on the
DO(. Excessive pressure on the tool will only cause a poor
finish and overloading of the motor.
Dressing wheel point
When the wheel point becomes "loaded"
with various bits and particles, you should
dress the wheel point with the dressing
stone.
7

MAINTENANCE
Always be sure that the tool is switchedoff and unplugged before attemptingto perform
inspection or maintenance.
. CAUTION:
Replacing carbon brushes
Remove and check the carbon brushes
regularly. Replacewhen they wear down to
the limit mark. Keep the carbon brushes
clean and free to slip in the holders. Both
carbon brushes should be replaced
at the
same time. Use only Makita carbon brushes.
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.
Limit mark
Brush holder cap
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.
The accessoriesor attachments should
be used only inthe proper and intended manner.
0 Collet cone
0 Wrench 10
Part No. 781003-0
Part No
I 794050 2
b 794051 -0
7 7940528
Part No. I Size
763626-6 1 118"
Abrasive material
Wheel diameter Overall length
Imml Imml
5 W16'l
6 11/4"l
8 15/16'l
60 I2 3/8"l A
763627- 4
763620-8
5 794053-6
763625-8 I 114"
10 13/8"l
0 Dressingstone
Part
No. 794217-2
5 794055 2
0 Wheel point
6 l1/4"l
0 Wrench 17
Part NO. 781008-0
- .._.
a1 794057a
(3, 7940586
3 7940594
fi 741134 7
__ -
10 l3/8"l
5 l3/16"l 100 14" I
10 W8"I 60 I2 3/8"l
A
~~~~ 1 Abrasive color I Abrasive characteristics Application
WA
60 I2 3/8"l
I IA
19 43/4"1
741615
1
141 7416169
These are 114" Shank size
Select your wheel point interms of the application.
A
I Pale blue, Brown
I Toughest Of all, slightly less brittle. 1 To grind mildsteel, carbon steel, etc.
WA
1 White, Orange I Less tough but slightly harder. I To grind hardenedand special steels.
9

Sep.-21-'89 us
114"
@mu DIE GRINDER
-
Model 906H
Note: The switch, noise suppressor and other part configurations
may differ from country to country.
10

MODEL 906H
& DESCRIPTION
Sep.-21-'89 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
1
1
1
1
1
1
1
1
1
4
1
1
1
1
2
1
2
1
1
1
1
2
1
-
Coilet Nut 6
Collet cone
Front Cap
Spindle
Bail Baaring 6001LB
Retaining
Ring 5-12
Flat Washer 22
Flat Washer
10
Set Screw M4x6
Pan Head Screw M4x35 With Washer1
Barrel
Ball Bearing 60ooCB
Weve Washer 18
Plate
Pan Head Screw M4x8 lWnh Washerl
Cup Ring
Pan Heed Screw M4x20 (With Washer)
Rear Cover
FIELD ASSEMBLY
Ball
Bearing 627LB
Oust
Seal 7
Hex Bolt M4x60 IWith Washer)
ARMATUREASSEMBLY
IWith
Ilem 20. 21. 23 .8 24)
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
45
46
47
48
-
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
2
1
1
1
2
2
1
-
Fan 52
Flat W8sher 10
Ball Bearing 600OLB
Inner cover
Rubber Pin 4
Rubber Pin 4
Switch
Pan
Head Screw M4x8 (With Washer)
Washer 12
Switch
Holder
Durt cover
Cord
Cord Guard
Strain Relief
Insulation Washer
Pan
Head Screw M4x10 (With Washer1
Name Plate
Pan
Head Screw M4rB IWith Washed
Brush Holder Cap
Carbon Blush
Motor
Housing
lnSulatlOn Paper
tiex. NUI
Hex. NU^
Note: The switch and other pan specificalions may differ from counfry to country
11

MAKITA LlMVED ONE YEAR WARRANTY
Warranty Policy
Every Makita tool is thoroughly inspected and tested before leavingthe factory. It is warranted to
be free of defects from worhanship and materials for the period of ONE YEAR from the date of
original purchase. Should any trouble develop during this one-yearperiod. return the COMPLETE
tool, freight prepaid, toone 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.
ThisWarranty 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;
alterationshave been made to the tool.
IN NO EVENT SHALL MAKITA BE LIABLE FOR ANY INDIRECT, INCIDENTAL OR CON-
SEQUENTIAL DAMAGES FROM THE SALEOR USE OFTHE PRODUCT.THIS DISCLAIMER
APPLIESBOTH DURING AND AFTER THE TERM OFTHISWARRANTY.
MAKITA DISCLAIMS LIABILITY FOR ANY IMPLIED WARRANTIES, INCLUDING IMPLIED
WARRAWIES OF “MERCHANTABILITY” AND “FITNESS FOR A SPECIFIC PURPOSE.”
AEER-THEoNE-yEARTERMONE-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 long an implied warranty lasts,
so the above limitation may not apply to you.
“aFllrtkrr - -,Ltd.
11-8,3-chome, Sumiyorhi-cho, Anjo, Aichi 446, Japan
883498 - 066
PRINTED IN JAPAN
1989 - 11 - N