Makita 6910 User manual

INSTRUCTION MANUAL
WARNING:
For your personal safety, READ and UNDERSTAND before using.
SAVE THESE INSTRUCTIONS FOR FUTURE REFERENCE.
Impact Wrench
25.4 mm (1”)
MODEL 6910
002293

2
SPECIFICATIONS
• Manufacturer reserves the right to change specifications without notice.
• Specifications may differ from country to country.
GENERAL SAFETY RULES USA001-2
(For All Tools)
WARNING:
Read and understand all instructions. Failure to follow all
instructions listed below, may result in electric shock, fire and/or
serious personal injury.
SAVE THESE INSTRUCTIONS
Work Area
1. Keep your work area clean and well lit.
Cluttered benches and dark areas invite acci-
dents.
2. Do not operate power tools in explosive
atmospheres, such as in the presence of
flammable liquids, gases, or dust. Power
tools create sparks which may ignite the dust
or fumes.
3. Keep bystanders, children, and visitors
away while operating a power tool. Distrac-
tions can cause you to lose control.
Electrical Safety
4. Grounded tools must be plugged into an
outlet properly installed and grounded in
accordance with all codes and ordi-
nances. Never remove the grounding
prong or modify the plug in any way. Do
not use any adaptor plugs. Check with a
Model 6910
Capacities Bolt size M22 - M24 (7/8” - 1”)
Square drive 25.4 mm (1”)
No load speed (RPM) 1,400/min.
Impacts per minute 1,500
Max. fastening torque 980 N.m (722 ft.lbs)
Overall length 389 mm (15-1/4”)
Net weight 9 kg (19.8 lbs)

3
qualified electrician if you are in doubt as
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.
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.
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.
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.
Personal Safety
9. Stay alert, watch what you are doing and
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.
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.
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.
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.
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.
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.
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.
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.
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.
19. Store idle tools out of reach of children
and other untrained persons. Tools are
dangerous in the hands of untrained users.
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.
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.

4
22. Use only accessories that are recom-
mended by the manufacturer for your
model. Accessories that may be suitable for
one tool, may become hazardous when used
on another tool.
SERVICE
23. Tool service must be performed only by
qualified repair personnel. Service or main-
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.
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.
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”.
Table 1: Minimum gage for cord
Ampere Rating Volts Total length of cord in feet
120 V 25 ft. 50 ft. 100 ft. 150 ft.
More Than Not More Than AWG
0 6 18 16 16 14
6 10 18161412
10 12 16 16 14 12
12 16 14 12 Not Recommended

5
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.
SPECIFIC SAFETY RULES USB003-2
DO NOT let comfort or familiarity with product (gained from
repeated use) replace strict adherence to impact wrench safety
rules. If you use this tool unsafely or incorrectly, you can suffer
serious personal injury.
1. Hold tool 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 tool “live” and
shock the operator.
2. Wear ear protectors.
3. Check the socket carefully for wear,
cracks or damage before installation.
4. Hold the tool firmly.
5. Always be sure you have a firm footing.
Be sure no one is below when using the
tool in high locations.
6. The proper fastening torque may differ
depending upon the kind or size of the
bolt. Check the torque with a torque
wrench.
Grounding Means
Cover of Grounded
Outlet Box
Adapter
Grounding
Blade
Fig. A Fig. B Fig. C

6
SAVE THESE INSTRUCTIONS
WARNING:
MISUSE or failure to follow the safety rules stated in this
instruction manual may cause serious personal injury.

7
FUNCTIONAL
DESCRIPTION CAUTION:
•Always be sure that the tool is switched off and
unplugged before adjusting or checking function on the
tool.
Switch action
CAUTION:
•Before plugging in the tool, always check to see that the
switch trigger actuates properly and returns to the “OFF”
position when released.
•Change the direction of rotation only when the tool
comes to a complete stop. Changing it before the tool
stops may damage the tool.
The switch is reversible, providing either clockwise or coun-
terclockwise rotation. To start the tool, simply pull the lower
part of the switch trigger for clockwise or the upper part for
counterclockwise. Release the switch trigger to stop.
ASSEMBLY CAUTION:
•Always be sure that the tool is switched off and
unplugged before carrying out any work on the tool.
Installing side grip (auxiliary handle)
Fit the side grip into the groove on the middle of the hammer
case and fasten securely.
Selecting correct socket
Always use the correct size socket for bolts and nuts. An
incorrect size socket will result in inaccurate and inconsistent
fastening torque and/or damage to the bolt or nut.
1. Switch trigger
1
002315
1. Side grip
1
002333

8
Installing or removing socket
To install the socket, push it onto the anvil of the tool until it
locks into place.
To remove the socket, simply pull it off.
OPERATION The proper fastening torque may differ depending upon the
kind or size of the bolt, the material of the workpiece to be
fastened, etc. The relation between fastening torque and fas-
tening time is shown in the figure.
Hold the tool firmly and place the socket over the bolt or nut.
Turn the tool on and fasten for the proper fastening time.
1. Socket
2. Anvil
1
2
002340
N.m (ft.lbs)
400
(288)
500
(361)
600
(433)
700
(505)
800
(577)
900
(649)
1,000
(722)
1,100
(794)
1,200
(866)
1,300
(938)
1,400
(1,010)
300
(216)
200
(144)
100
(72)
01234 56
(S)
Tightening time
Tightening torque
Rated voltage
90% of rated voltage
002356

9
NOTE:
•Hold the tool pointed straight at the bolt or nut.
•Excessive fastening torque may damage the bolt/nut or
socket. Before starting your job, always perform a test
operation to determine the proper fastening time for your
bolt or nut.
The fastening torque is affected by a wide variety of factors
including the following. After fastening, always check the
torque with a torque wrench.
1. Voltage
Voltage drop will cause a reduction in the fastening
torque.
2. Socket
•Failure to use the correct size socket will cause a
reduction in the fastening torque.
•A worn socket (wear on the hex end or square end)
will cause a reduction in the fastening torque.
3. Bolt
•Even though the torque coefficient and the class of
bolt are the same, the proper fastening torque will
differ according to the diameter of bolt.
•Even though the diameters of bolts are the same, the
proper fastening torque will differ according to the
torque coefficient, the class of bolt and the bolt
length.
4. The use of the universal joint or the extension bar some-
what reduces the fastening force of the impact wrench.
Compensate by fastening for a longer period of time.
5. The manner of holding the tool or the material of driving
position to be fastened will affect the torque.

10
MAINTENANCE CAUTION:
•Always be sure that the tool is switched off and
unplugged before attempting to perform inspection or
maintenance.
Replacing carbon brushes
Remove and check the carbon brushes regularly. Replace
when 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 iden-
tical 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.
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.
•Extension bar
•Side grip
•Hex wrench
•Steel carrying case
1. Limit mark
1
001145
1. Screwdriver
2. Brush holder cap
1
2
002375

Memo
11

Memo
12

13
Fold
Cut
Stamp
Timbre
Makita Canada Inc.
1950 Forbes Street,
Whitby, Ontario
L1N 7B7

14
Your answers to the following questions are appreciated.
Date Purchased Model No.
Serial No.
Initial Last Name
Street Address
City Province
AGE:
Male Female MarriedSingle
Month Day Year 20
Under 19 20-29 30-39 40-49 Over 50
Paste Paste Paste Paste Paste Paste Paste Paste
Paste Paste Paste Paste Paste Paste
Paste Paste Paste Paste Paste Paste
1. This product was purchased from?
Industrial Supply
Other ( )Tool Distributor
Hardware/lumber Store
2. Use of the product is intended for?
5. Any comments?
Home maintenance
Other ( )Industrial maintenance
Construction trade
3. How did you first learn of Makita Power Tools?
Catalog
Other ( )From dealer
Magazine/Newspaper
Store display
4. Most favored points are?
Makita Brand
PowerFeatures
Design
Other ( )Size
Price
Occupation:
Dealer's Name & Address:
Postal Code
Certificate of Warranty
Mail to Makita

15
Factory Service Centres
For the authorized service centre nearest you please refer to the local yellow pages directory under “tools”or con-
tact our customer service department (Tel) 1-800-263-3734
When you need service...
•Explain the problem in a letter
•Enclose the letter with the tool
•Package carefully and send prepaid
to the nearest Makita factory or
authorized service centre
CUSTOMER RECORD
DATE
PURCHASED:
DEALER’S NAME
& ADDRESS:
MODEL NO.:
SERIAL NO.:
Head Office: 1950 Forbes St., Whitby, Ontario, L1N 7B7
(905) 571 - 2200 1-800-263-3734
Regional Office: 11771 Hammersmith Way, Richmond
(604) 272 - 3104 1-800-663-0909B.C. V7A 5H6
Regional Office: 6389 boul. Couture, St. Leonard, Quebec
(514) 323 - 1223 1-800-361-7049H1P 3J5(Montreal)
Dartmouth: 202 Brownlow Avenue
(902) 468 - 7064 1-888-625-4821Dartmouth, N.S., B3B 1T5
Ville St. Laurent: 1140 Rue Bégin, Ville St. Laurent, Quebec
(514) 745 - 5025 1-888-745-5025H4R 1X1(Montreal)
Les Saules: 1200 St. Jean Baptiste, Unit 106, Les Saules,
(418) 871 - 5720 1-800-663-5757Quebec, G2E 5E8(Quebec)
Nepean: 203 Colonnade Road, Unit #6, Nepean,
(613) 224 - 5022 1-888-560-2214Ontario K2E 7K3(Ottawa)
London: 317 Adelaide St. S., Unit 117, London,
(519) 686 - 3115 1-800-571-0899Ontario, N5Z 3L3
Whitby: 1950 Forbes St., Whitby, Ontario, L1N 7B7
(905) 571 - 2200 1-800-263-3734
Mississauga: 6350 Tomken Rd., Unit 8, Mississauga,
(905) 670 - 7255 1-888-221-9811Ontario, L5T 1Y3
Calgary: #8-6115 Fourth St. S.E., Calgary
(403) 243 - 3995 1-800-267-0445Alberta, T2H 2H9
Richmond: 11771 Hammersmith Way, Richmond, B.C.,
(604) 272 - 3104 1-800-663-0909V7A 5H6
Edmonton: 11614-149 Street, Edmonton, Alberta,
(780) 455 - 6644 1-888-455-6644T5M 3R3
Coquitlam: 2131 Hartley Ave., #103
(604) 525 - 7434 1-800-266-7738Coquitlam, B.C. V3K 2Z3
Winnipeg: 1670 St. James Street, Winnipeg, Manitoba,
(204) 694 - 0402 1-800-550-5073R3H 0L3
Saskatoon: 206A-2750 Faithful Avenue Saskatoon,
(306) 931 - 0111 1-888-931-0111Saskatchewan, S7K 6M6

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 Centres.
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 normal maintenance is required,
•repairs have been made or attempted by others,
•the tool has been abused, misused or improperly maintained,
•alterations have been made to the tool.
“The Makita Warranty is the only and the entire written warranty given by Makita for the Makita tools. No dealer or his agent
or employee is authorized to extend or enlarge upon this warranty by any verbal or written statement or advertisement.”
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 rights. The provisions contained in this warranty are not intended to limit, modify, take away
from, disclaim or exclude any warranties set forth in any provincial legislation. To the extent required by law, the provisions in
any provincial or federal legislation with respect to warranties take precedence over the provisions in this warranty.”
MAKITA LIMITED ONE YEAR WARRANTY
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 Corporation
3-11-8, Sumiyoshi-cho,
Anjo, Aichi 446-8502 Japan
883205-233