MasterCraft 099-9059-4 User manual

1/2" IMPACT WRENCH
099-9059-4
Owner’s Manual
PRODUCT SPECIFICATIONS
Motor:
120 V AC, 60 Hz, 3.5 A
Speed:
0–3200 RPM (no load)
Impact speed:
0–3200 BPM
Torque:
220 ft/lbs
Square drive:
1/2”
Weight:
4 lb 7 oz (2.0 kg)
TOLL FREE HELPLINE 1-800-689-9928
Imported by Mastercraft Canada Toronto, Canada M4S 2B8

2
Product specifications ………….…………………………………………………….
1
Table of contents ……………………………………………………………………...
2
General safety warnings ……………………………………………………………..
3–4
Eye, ear & lung protection ……………………………………………………………
3–4
Electrical safety ……………………………………………………………………….
4
Power tool safety ……………………………………………………………………...
5–6
General safety rules …………………………………………………………………..
5
Work area ………………………………………………………………….…………..
5
Electrical safety ……………………………………………………………………….
5
Personal safety ………………………………………………………………………..
5–6
Use and care of power tools .………………………………………………………..
6
Service …………………………………………………………………………………
6
Specific safety rules …………………………………………………………………..
7
Extension cord safety ………………………………………………………………...
8
Symbols ………………………………………………………………………………..
9
Know your impact wrench ……………………………………………………………
10
Accessories ……………………………………………………………………………
10
Contents ……………………………………………………………………………….
11
Assembly and operation ……………………………………………………………..
12–15
Installing impact sockets ……………………………………………………………..
12
Forward/reverse button ………………………………………………………………
12–13
Variable speed trigger switch ………………………………………………………..
13
Removing fasteners …………………………………………………………………..
14–15
Maintenance …………………………………………………………………………..
16
Exploded view …………………………………………………………………………
17
Parts list ………………………………………………………………………………..
18–19
Warranty ……………………………………………………………………….………
20–21
TABLE OF CONTENTS

3
EYE, EAR & LUNG PROTECTION
This instruction manual includes the following:
General Safety Rules
Specific Safety Rules and Symbols
Functional Description
Assembly
Operation
Maintenance
Accessories
!
ALWAYS WEAR EYE PROTECTION THAT CONFORMS WITH CSA
REQUIREMENTS or ANSI SAFETY STANDARD Z87.1
FLYING DEBRIS can cause permanent eye damage. Prescription
eyeglasses ARE NOT a replacement for proper eye protection.
WARNING: Non-compliant eyewear can cause serious injury if
broken during operation of a power tool.
SAVE THESE INSTRUCTIONS FOR REFERENCE
WARNING: Use hearing protection, particularly during extended
periods of operation of the tool or if the operation is noisy.
!
GENERAL SAFETY WARNINGS
CAUTION: Before using this tool or any of its accessories, read this
manual and follow all Safety Rules and Operating Instructions.
!

4
ELECTRICAL SAFETY
WARNING: To avoid electrical hazards, fire hazards or damage to the
tool, use proper circuit protection.
This tool is wired at the factory for 110–120 V operation. It must be
connected to a 110–120 V 15 A time delayed fuse or circuit breaker. To
avoid shock or fire, replace power cord immediately if it is worn, cut or
damaged in any way.
GENERAL SAFETY WARNINGS
WEAR A DUST MASK THAT IS DESIGNED TO BE USED WHEN
OPERATING A POWER TOOL IN A DUSTY ENVIRONMENT.
WARNING: Dust that is created by power sanding, sawing, grinding,
drilling, and other construction activities may contain chemicals that are
known to cause cancer, birth defects. or other genetic abnormalities. These
chemicals include:
Lead from lead-based paints
Crystalline silica from bricks, cement, and other masonry products
Arsenic and chromium from chemically-treated lumber
The level of risk from exposure to these chemicals varies according to how
often this type of work is performed. In order to reduce exposure to these
chemicals, work in a well-ventilated area, and use approved safety
equipment, such as a dust mask that is specifically designed to filter out
microscopic particles.
!

5
GENERAL SAFETY RULES
WARNING: Read and understand
all instructions. Failure to follow all
instructions listed below may result in
electric shock, fire and/or serious personal
injury.
WORK AREA
Keep your work area clean and well lit.
Cluttered benches and dark areas invite
accidents.
Do not operate power tools in potentially
explosive environments, such as in the
presence of flammable liquids, gas or dust.
Power tools create sparks that may ignite
the dust or fumes.
Keep bystanders, children and visitors
away while operating the tool. Distractions
can cause the operator to lose control.
ELECTRICAL SAFETY
Double insulated tools are equipped with a
polarized plug (one blade is wider than the
other). This plug will only fit into a
polarized plug one way.
If the plug does not fit into the outlet
properly, reverse the plug. If it still does not
fit, contact a qualified electrician to install a
polarized outlet. Do not alter the plug in
any way. Double insulation eliminates the
need for the three-prong grounded power
cord and grounded power supply system.
Avoid contact between the operator's body
and grounded surfaces such as pipes,
radiators, ranges, and refrigerators. There
is an increased risk of electric shock if the
operator's body is grounded.
Do not expose power tools to rain or wet
conditions. Water entering the power tool
will increase the risk of electric shock.
Do not abuse the cord. Do not use the
power cord to carry the tool or to pull the
plug out of the outlet. Keep the power cord
away from heat, oil, sharp edges, and
moving parts. Replace a damaged power
cord immediately. A damaged power cord
increases the risk of electric shock.
When operating a power tool outdoors,
use an outdoor extension cord marked
“W-A” or “W”. These cords are rated for
outdoor use and they reduce the risk of
electric shock.
PERSONAL SAFETY
Stay alert, be aware of the surroundings,
and use common sense when operating a
power tool. Do not use a power tool while
tired or under the influence of drugs,
alcohol, or medication. A moment of
inattention while operating a power tool
could result in serious personal injury.
Dress properly. Do not wear loose clothing
or jewellery.
Contain long hair. Keep hair, clothing, and
gloves away from moving parts. Loose
clothing, jewellery, or long hair can get
caught in moving parts.
!
POWER TOOL SAFETY

6
PERSONAL SAFETY –cont’d
Avoid accidental start-ups. Verify that the
switch is in the OFF position before
plugging the tool in. Carrying a power tool
with a finger on the switch or plugging in a
tool that has the switch in the ON position
invites accidents.
Remove adjusting keys and wrenches
before turning the tool ON. A wrench or
key that is left attached to a rotating part of
the tool may result in personal injury.
Do not overreach. Keep proper footing and
balance at all times. Proper footing and
balance allows the operator to maintain
better control of the tool in unexpected
situations.
Use safety equipment. Always wear eye
protection.
Use a dust mask, non-skid safety shoes, a
hardhat, or hearing protection when
appropriate.
USE AND CARE OF POWER TOOLS
Use clamps or another practical means to
secure and support the workpiece to a
stable platform. Holding the work in a hand
or against the body is not stable, and may
lead to loss of control.
Do not force the tool. Use the correct tool
for the application. The correct tool will do
the job better and safer when it is used at
the rate that it was designed to work at.
Do not use a power tool if it cannot be
turned ON or OFF using the power switch.
A tool that cannot be controlled using the
switch is dangerous, and must be repaired.
Disconnect the plug from the outlet before
making any adjustments, changing
accessories, or storing the tool. Such
preventive safety measures reduce the risk
of accidental start-ups.
When power tools are not in use, store
them out of the reach of children and other
untrained persons. Tools are dangerous in
the hands of untrained users.
Maintain tools with care. Keep cutting tools
sharp and clean. Properly maintained
cutting tools with sharp cutting edges are
less likely to bind, and are easier to
control.
Inspect the tool for misalignment or binding
of moving parts, broken parts, and any
other condition that may affect the
operation of the tool. If it is damaged, have
the tool serviced before using it. Many
accidents are caused by poorly maintained
tools.
Use only accessories that are
recommended by the manufacturer for this
model. Accessories that are suitable for
one tool may become hazardous when
used with another tool.
SERVICE
Tools must be serviced by qualified
personnel. Service or maintenance
performed by non-qualified personnel
could result in a risk of injury.
When servicing a tool, use only identical
replacement parts. Follow the instructions
in the Maintenance section of this Manual.
The use of unauthorized parts, or failure to
follow the instructions in the Maintenance
section of this Manual may create a risk of
electric shock or injury.
POWER TOOL SAFETY

7
WARNING: Know your impact
wrench. Read the Owner’s Manual
carefully. Learn the tool’s applications
and limitations, as well as the specific
potential hazards related to this tool.
Following this rule will reduce the risk of
electric shock, fire or serious injury.
Always wear eye protection. Any power
tool can throw foreign objects
into your eyes and cause
permanent eye damage.
ALWAYS wear safety goggles
(not glasses) that comply with ANSI safety
standard Z87.1. Everyday glasses have
only impact resistant lenses. They ARE
NOT safety glasses.
WARNING: Glasses or goggles
not in compliance with ANSI Z87.1
could cause serious injury when they
break.
Always use hearing protection when
operating the impact wrench.
Use only impact sockets and accessories
that are designed for use with an impact
wrench. Do not use chrome plated sockets
and accessories. Chrome plated sockets
and accessories are designed for hand
use only and MUST NOT be used with an
impact wrench. They may shatter and
possibly cause serious injury.
Before each use, check the impact sockets
and accessories for excessive wear or
cracks. Worn or damaged sockets or
accessories may shatter and possibly
cause serious injury. Worn accessories
may allow the socket to come off during
operation of the impact wrench.
Never use the impact wrench as a torque
wrench. Always use a torque wrench to
adjust the fastener to the specified torque.
Keep the impact wrench handle and body
clean and free of oil and grease. Always
use a clean dry cloth when cleaning. Do
not use solvents, brake fluid, gasoline or
other petroleum products to clean the tool.
They will damage the tool.
Do not wear neckties or loose clothing.
When wearing gloves, they must be tight
fitting and slip resistant type. Leather
gloves offer the best protection.
Always use two hands when operating the
impact wrench. Use one hand on the
handle and the other on the front of the
tool body.
Never place your hand so it is touching the
socket or accessory when the tool is
turned ON. Your hand could be seriously
injured.
Always remove the plug from the power
source before installing or removing any
socket or accessory.
Be ready for components to shift when
removing any fastener. The speed of the
fastener removal could cause unexpected
shifting of the components.
SPECIFIC SAFETY RULES
!
!
!

8
WARNING: Keep the extension
cord clear of the work area. Position the
cord so that it will not get caught on the
workpiece, a tool, or any other obstruction
while the power tool is in use.
If an extension cord is used with this
impact wrench, verify that it is in good
condition. When using an extension cord,
be sure to use one that is heavy enough to
carry the current that the tool will draw. An
undersized cord will cause a drop in line
voltage, which will result in a loss of power
and overheating.
The following table shows the correct size
to use according to cord length and the
amperage rating that is listed ton the tool's
nameplate. When in doubt, use the next
heavier gauge. The smaller the gauge
number, the heavier the cord.
Verify that the extension cord is properly
wired and in good condition. Replace a
damaged extension cord immediately, or
have it repaired by a qualified electrician
before using it. Keep the extension cord
away from sharp objects, excessive heat,
and damp or wet areas.
Use a separate electrical circuit for power
tools. This circuit must consist of not less
than 14 gauge wire, and should be
protected by either a 15 A time-delayed
fuse or a circuit breaker. Before connecting
the power tool to the outlet, verify that the
switch is in the OFF position, and that the
voltage of the power source is the same as
the voltage that is indicated on the tool's
nameplate. Running this impact wrench at
lower voltage will damage the motor.
EXTENSION CORD SAFETY
!
MINIMUM GAUGE (AWG)
EXTENSION CORDS (120 V use only)
Amperage
rating
Total length
More
than
Not
more
than
25'
(7.5 m)
50'
(15 m)
100'
(30 m)
150'
(45 m)
0
6
18
16
16
14
6
10
18
16
14
12
10
12
16
16
14
12
12
16
14
12
Not Applicable

9
V
Volts
A
Amperes
Hz
Hertz
W
Watts
kW
Kilowatts
Microfarads
L
Litres
kg
Kilograms
H
Hours
N/cm2
Newtons per square
centimeter
Pa
Pascals
Min
Minutes
S
Seconds
Alternating current
Three-phase alternating
current
Three-phase alternating
current with neutral
Direct current
No load speed
Alternating or direct
current
Class II construction
Splash-proof
construction
Watertight construction
Protective grounding at
grounding terminal,
Class I tools
Revolutions or
reciprocations per
minute
Diameter
Off position
Arrow
Warning symbol
SYMBOLS
WARNING: Some of the following symbols may appear on the impact
wrench. Study these symbols and learn their meaning. Proper interpretation
of these symbols will allow for more efficient and safer operation of this tool.
!
This symbol designates that
this tool is listed with both
Canadian and U.S.
requirements by Underwriters
Laboratories.
61TN
E213739
JD2177U

10
AVAILABLE ACCESSORIES
WARNING: Use only accessories
that are recommended for this impact
wrench. Follow the instructions that
accompany the accessories. The use of
improper accessories may result in
injury to the operator or damage to the
impact wrench.
Before using any accessory, carefully read
the instructions or the owner’s manual for
the accessory.
Impact sockets
Impact extensions
WARNING: If any part is missing or
damaged, do not plug the impact wrench
into the power source until the missing or
damaged part is replaced.
ACCESSORIES & CARTON CONTENTS
KNOW YOUR IMPACT WRENCH
ACCESSORIES
!
!
½” square
drive
Air vents
Variable speed
trigger switch
Air vents
Handle
Forward/reverse
button

11
CONTENTS
Carefully unpack the impact wrench.
Compare against the “IMPACT WRENCH
COMPONENTS” chart below.
NOTE: See illustration of impact wrench at
right.
WARNING: To avoid fire or toxic
reaction, never use gasoline, naphtha,
acetone, lacquer thinner or similar
highly volatile solvents to clean the
tool.
!
CONTENTS
IMPACT WRENCH COMPONENTS
KEY
DESCRIPTION
QTY
A
Impact wrench
1
B
Impact sockets
1/2"
5/8"
3/4"
7/8"
1"
1
1
1
1
1
C
Impact socket case
1
Owner’s manual
1

12
INSTALLING IMPACT SOCKETS
WARNING: Use only impact
sockets and accessories that are
designed for use with an impact
wrench. Do not use chrome plated
sockets and accessories. Chrome plated
sockets and accessories are designed for
hand use only and MUST NOT be used
with an impact wrench. They may shatter
and possibly cause serious injury.
WARNING: Always remove the plug
from the power source before changing
any sockets or accessories. You may
injure your hand if the tool is started
accidentally.
To install a socket, press the square
portion of the socket (1) onto the square
drive (2) of the impact wrench (see Fig. 1).
NOTE: Slide the socket fully onto the
square drive so the socket retainer (3) will
hold the socket firmly in place
FORWARD/REVERSE BUTTON
This impact wrench is equipped with a
forward/reverse button (1) (Fig. 2).
1. To operate the impact wrench in the
reverse direction, press the
forward/reverse button to the RIGHT.
This direction of rotation will loosen
the fastener.
2. To operate the impact wrench in the
forward direction, press the
forward/reverse button to the LEFT.
This direction of rotation will tighten
the fastener.
ASSEMBLY AND OPERATION
!
!
Fig. 1
Fig. 2

13
FORWARD/REVERSE BUTTON –cont’d
NOTE: Never press the forward/reverse
button while the tool it turned ON. Damage
to the tool will result.
VARIABLE SPEED TRIGGER SWITCH
This impact wrench is equipped with a
variable-speed ON/OFF trigger switch.
1. To start impact wrench, gently
squeeze the trigger switch (2) (Fig. 3).
NOTE: The impact wrench will turn at its
slowest speed when the trigger switch is
depressed slightly. The impact wrench will
turn at its fastest speed when the trigger
switch is fully depressed.
2. To stop the impact wrench, release
the trigger switch.
NOTE: If the tool gets warm while running
at slow speeds, stop and allow it to cool.
ASSEMBLY AND OPERATION
Fig. 3

14
REMOVING FASTENERS
One of the most common uses for the
impact wrench is to remove car wheel nuts
for rotating the tires. Car wheel nut
removal is used for illustrative purposes.
DANGER: Before attempting to
remove a car wheel, make sure all
jacking, wheel blocking and wheel
removal safety procedures illustrated in
the Owner’s Manual for your car are
followed exactly. Failure to follow those
safety instructions could result in
serious injury or death.
ASSEMBLY AND OPERATION
!
For safety reasons, the operator
must read the sections of this
Owner’s Manual entitled “GENERAL
SAFETY WARNINGS”, “POWER
TOOL SAFETY”, “SPECIFIC SAFETY
RULES”, “EXTENSION CORD
SAFETY” and “SYMBOLS” before
using this impact wrench.
Verify the following every time the
impact wrench is used:
1. Safety glasses and hearing
protection are being worn.
2. Socket or accessory is “impact
wrench” rated.
3. Socket or accessory is in good
condition.
Failure to observe these safety rules
will significantly increase the risk of
injury.
WARNING
!

15
REMOVING FASTENERS –cont’d
1. Install the correct size of impact
socket on the impact wrench as
outlined in Fig. 1
2. Set the forward/reverse button to the
RIGHT for removing fasteners (Fig. 2).
3. Plug the impact wrench power cord
into an appropriate power source.
4. Grasp the impact wrench handle (1)
with one hand and the front housing of
the impact wrench (2) with the other
hand (see Fig. 4).
5. Place impact socket (3) onto the
wheel nut.
NOTE: Make sure the socket is fully
engaged with the nut to avoid
potentially damaging the socket or the
wheel nut.
6. While holding the tool level with the
ground and with a firm grasp, squeeze
the trigger switch (4).
When removing fasteners, do not allow the
impact wrench to operate more than 15
seconds unless the fastener begins to turn.
If the fastener fails to turn within 15
seconds, reverse the direction of rotation
and operate the impact wrench in a
forward direction on the fastener for a few
seconds. Now switch back to reverse
direction and remove the fastener. This
procedure will usually break loose seized
or “frozen” fasteners.
WARNING: Operating the impact
wrench for more that 15 seconds at a time
on a seized or “frozen” fastener will place
severe stress on the impact wrench and
cause damage. It may also break the
fastener.
!
Fig. 4
!
ASSEMBLY AND OPERATION
Fig. 4

16
GENERAL
WARNING: When servicing, use
only identical replacement parts. Use of
any other part may create a hazard or
cause product damage.
DO NOT use solvents when cleaning
plastic parts. Plastics are susceptible to
damage from various types of commercial
solvents and may be damaged by their
use. Use a clean cloth to remove dirt, dust,
oil, grease etc.
WARNING: Do not at any time
allow brake fluids, gasoline, petroleum-
based products, penetrating oils, etc. to
come into contact with plastic parts.
They contain chemicals that can
damage, weaken or destroy plastic.
DO NOT abuse power tools. Abusive
practices can damage the tool as well as
the workpiece.
WARNING: DO NOT attempt to
modify tools or create accessories. Any
such alteration or modification is
misuse and could result in a hazardous
condition leading to possible serious
injury. It will also void the warranty.
LUBRICATION
All of the bearings in this tool are
lubricated with a sufficient amount of high-
grade lubricant for the life of the unit under
normal conditions. Therefore, no further
lubrication is required.
!
!
!
MAINTENANCE

17
EXPLODED VIEW

18
WARNING: When servicing, use only Mastercraft®replacement parts. The use of
any other parts may create a safety hazard or cause damage to the impact wrench.
Any attempt to repair or replace electrical parts on this impact wrench may create a safety
hazard unless repairs are performed by a qualified technician. For more information, call
the Toll-Free Helpline, at 1-800-689-9928.
Always order by PART NUMBER, not by key number.
Key #
Part #
Part Name
Quantity
1
4030010114
ST3.9X25
4
2
4040030001
Spring washer 4mm
4
3
2020050059
aluminum casting
1
4
3140020017
"O" ring
1
5
2010080012
Shaft bushing
1
6
2030020034
Washer No.1
1
7
2040040088
Outer shaft
1
8
4080070001
Steel ball 5.5
2
9
2040200002
Torsion slot
1
10
4080040001
Steel ball 4
24
11
2030020035
Washer No.2
1
12
2050060178
Torsion spring
2
13
2040050022
Inner shaft
1
14
2010010027
Planetary gear
3
15
4110050003
Pin
3
16
2030020229
Washer No.3
1
17
4010010058
6002-2RS bearing
1
18
2010090067
Inner gear ring
1
19
3150070079
Gear box
1
20
4010010084
6000-2RS bearing
1
PARTS LIST
!

19
Key #
Part #
Part Name
Quantity
21
1010180009
Rotor
1
22
3150140006
Carbon brush cap
2
23
3150060015
Brush holder
2
24
1230010030
Carbon brush
2
25
2030070027
Brush holder support
1
26
4010010053
607-2RS bearing
1
27
1020180008
Stator
1
28
3022280004
Enclosure
1
29
3120030017
Direction setting button
1
30
1061010002
Switch
1
31
4030010106
ST3.9X19
8
32
4030010098
ST3.9X13
2
33
3140010004
Cord guard
1
34
1190030012
UL plug & cord
1
35
3140100006
Casting shell rubber
1
PARTS LIST

20
3-Year Limited Warranty
This Mastercraft product is guaranteed for a period of 3 years from the date of
original retail purchase against defects in workmanship and materials, except for the
following components:
a) Component A: Batteries, chargers and carrying cases, which are
guaranteed for a period of 2 years from the date of original retail purchase
against defects in workmanship and materials;
b) Component B: Accessories which are guaranteed for a period of 1 year
from the date of original retail purchase against defects in workmanship
and materials.
Subject to the conditions and limitations described below, this product, if returned to
us with proof of purchase within the stated warranty period and is covered under
this warranty, will be repaired or replaced (with the same model, or one of equal
value or specification),at our option. We will bear the cost of any repair or
replacement and any costs of labour relating thereto.
These warranties are subject to the following conditions and limitations:
a) A bill of sale verifying the purchase and the purchase date must be
provided;
b) This warranty will not apply to any product or part thereof that is worn,
broken or that has become inoperative due to abuse, misuse, accidental
damage, neglect or lack of proper installation, operation or maintenance
(as outlined in the applicable owner’s manual or operating instructions) or
that is being used for industrial, professional, commercial or rental
purposes;
c) This warranty will not apply to normal wear and tear or to expendable parts
or accessories that may be supplied with the product that are expected to
become inoperative or usable after a reasonable period of use;
d) This warranty will not apply to routine maintenance and consumable items
such as, including but not limited to, fuel, lubricants, vacuum bags, blades,
belts, sandpaper, bits, fluids, tune-ups or adjustments;
e) This warranty will not apply where damage is caused by repairs made or
attempted by others (i.e.: persons not authorized by the manufacturer);
f) This warranty will not apply to any product that was sold to the original
purchaser as a reconditioned or refurbished product (unless specified
otherwise in writing);
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