MasterCraft 54-2734-4 User manual

Owner’s Manual
1/2" IMPACT WRENCH
54-2734-4
CAUTION:
Before using this impact
wrench or any of its
accessories, read this
manual and follow all Safety
Rules and Operating
Instructions.
General Safety Rules
Specific Safety Rules
and Symbols
Functional Description
Assembly
Operation
Maintenance
Accessories
Imported by Mastercraft Canada Toronto, Canada M4S 2B8
Rev 1.3 13/06/2009

2
SECTION
PAGE
SECTION
PAGE
Warranty ….……………………….
2
Know your impact wrench .…..
9
Product specifications …………...
3
Accessories ……………………
9
Power tool safety …………………
3–5
Carton contents……..………...
9–10
Specific safety rules ……………..
6
Assembly & operation ..………
10–12
Extension cord safety ……………
7
Maintenance …….……………..
13
Symbols …………………………..
8
Parts & service ..……..………..
14–16
WARRANTY
TABLE OF CONTENTS
TABLE OF CONTENTS
Limited 3-year Replacement Warranty
This Mastercraft product carries a three (3) year replacement warranty against
defects in workmanship and materials. Mastercraft Canada agrees to replace the
defective product free of charge with the same model or one of equal value or
specification, within the stated warranty period, when returned by the original
purchaser with proof of purchase. Cordless tool battery or batteries and charger
and/or case carry a two (2) year replacement warranty against defects in
workmanship and materials. This product is not guaranteed against wear or
breakage due to misuse and/or abuse.
This product is not guaranteed if used for industrial or commercial purposes.
Mastercraft is a superior line of products selected for their workmanship and
materials. These products are designed to meet rigorous quality and performance
standards, and are approved by our Quality Assurance laboratory.
TOLL FREE HELPLINE: 1-800-689-9928

3
WARNING: To avoid electrical hazards, fire hazards or damage to the impact
wrench, use proper circuit protection.
This impact wrench 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.
!
PRODUCT SPECIFICATIONS
Rating ………………………………..
120 V, 60 Hz, AC
Amperes …………………………….
7.5 Amperes
Maximum torque: …………………..
240 ft lbs (325 Nm)
Blows per minute (BPM) …………..
2700
Square drive ………………………..
½"
Net weight …………………………..
7 lb 8 oz. (3.4 kg)
WARNING: Some dust created by power sanding, sawing, grinding, drilling
and other construction activities contains chemicals known to cause cancer, birth
defects or other reproductive harm. Some examples of these chemicals are:
Lead from lead-based paints
Crystalline silica from bricks, cement and other masonry products
Arsenic and chromium from chemically-treated lumber
Your level of risk from these exposures varies, depending on how often you do
this type of work. To reduce your exposure to these chemicals, work in a well-
ventilated area and work with approved safety equipment such as dust masks that
are specially designed to filter out microscopic particles.
!
POWER TOOL SAFETY
!
ALWAYS WEAR EYE PROTECTION
Any power tool can throw foreign objects into your eyes which could 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.

4
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 which may ignite the dust or fumes.
Keep bystanders, children and visitors
away while operating the tool.
Distractions can cause you to lose control.
ELECTRICAL SAFETY
Double insulated tools are equipped
with a polarized plug (one blade is wider
than the other). This plug will fit in a
polarized plug only one way. If the plug
does not fit fully in the outlet, 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 body contact with grounded surfaces
such as pipes, radiators, ranges and
refrigerators. There is increased risk of
electric shock if your 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. Never use the
cord to carry the tool 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.
When operating a power tool outdoors,
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
Stay alert, watch what you are doing
and use common sense when operating
a power tool. Do not use the 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.
Dress properly. Do not wear loose
clothing or jewellery.
Contain long hair. Keep your hair,
clothing and gloves away from moving
parts. Loose clothing, jewellery or long hair
can be caught in moving parts.
Avoid accidental starting. Be sure the
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.
SAVE THESE INSTRUCTIONS FOR REFERENCE
!
POWER TOOL SAFETY

5
POWER TOOL SAFETY
PERSONAL SAFETY –cont’d
Remove adjusting keys or 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 enables better control of the
tool in unexpected situations.
Use safety equipment. Always wear eye
protection. Dust mask, non-skid safety
shoes, hard hat or hearing protection must
be used for appropriate conditions.
TOOL USE AND CARE
Use clamps or another 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.
Do not force the tool. Use the correct
tool for your application. The correct tool
will do the job better and safer at the rate
for which it was designed.
Do not use the tool if the power switch
does not turn it ON or OFF. Any tool that
cannot be controlled with the switch is
dangerous and must be repaired.
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.
Store idle tools out of 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.
Check for misalignment or binding of
moving parts, breakage of parts and any
other condition that may affect the
tool’s operation. If damaged, have the
tool serviced before using. Many
accidents are caused by poorly maintained
tools.
Use only accessories that are
recommended by the manufacturer for
your model. Accessories that may be
suitable for one tool may become
hazardous when used on another tool.
SERVICE
Tool service must be performed only by
qualified personnel. Service or
maintenance performed by unqualified
personnel could result in risk of injury.
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.
SAVE THESE INSTRUCTIONS FOR REFERENCE

6
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 which could
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
!
!
SAVE THESE INSTRUCTIONS FOR REFERENCE

7
EXTENSION CORD SAFETY
WARNING: Keep the extension
cord clear of the working area. Position
the cord so it will not get caught on the
workpiece, tools or any other
obstructions while you are working with
the power tool.
Make sure any extension cord used with
this tool is in good condition. When
using an extension cord, be sure to use
one of heavy enough gauge to carry the
current the tool will draw. An undersized
cord will cause a drop in line voltage
resulting in loss of power and overheating.
The table on the following page shows the
correct size to use according to cord length
and nameplate ampere rating. If in doubt,
use the next heavier gauge. The smaller
the gauge number the heavier the cord.
Be sure your extension cord is properly
wired and in good condition. Always
replace a damaged extension cord or have
it repaired by a qualified electrician before
using it. Protect your extension cord from
sharp objects, excessive heat and damp or
wet areas.
Use a separate electrical circuit for your
power tools. This circuit must not be less
than 14 gauge wire and should be
protected with either a 15 A time delayed
fuse or circuit breaker. Before connecting
the power tool to the power source, make
sure the switch is in the OFF position and
the power source is the same as indicated
on the nameplate. Running at lower voltage
will damage the motor.
MINIMUM GAUGE (AWG) EXTENSION
CORDS
(120 V use only)
Ampere Rating
Total length in feet
More
Than
Not
More
Than
25’
50’
100’
150’
0
6
18
16
16
14
6
10
18
16
14
12
10
12
16
16
14
12
12
16
14
12
Not
Applicable
!

8
SYMBOLS
V
volts
A
amperes
Hz
hertz
W
watt
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 earthing at
earthing terminal, Class I
tools
revolutions or
reciprocations per minute
diameter
off position
arrow
warning symbol
WARNING: Some of the following symbols may be used on your tool.
Please study them and learn their meaning. Proper interpretation of these
symbols will allow you to operate the tool better and safer.
!
This symbol designates that
this tool is listed with both
Canadian and U.S.
requirements by Underwriters
Laboratories.
39LH
E325983

9
AVAILABLE ACCESSORIES
WARNING: Use only accessories
recommended for this impact wrench.
Follow instructions that accompany
accessories. Use of improper
accessories may cause injury to the
operator or damage to the tool.
Do not use any accessory unless you have
completely read the instructions or Owner’s
Manual for that accessory.
Impact sockets
Impact extensions
CARTON CONTENTS
WARNING: If any part is missing
or damaged, do not plug the tool into
the power source until the missing or
damaged part is replaced.
Carefully unpack the impact wrench.
Compare against the “IMPACT WRENCH
COMPONENTS” chart at right.
NOTE: See product diagram on Page 10.
WARNING: To avoid fire or toxic
reaction, never use gasoline, naphtha,
acetone, lacquer thinner or similar
highly volatile solvents to clean the tool.
KNOW YOUR IMPACT WRENCH
!
ACCESSORIES & CARTON CONTENTS
!
!
IMPACT WRENCH
COMPONENTS
KEY
DESCRIPTION
QTY
A
Impact wrench
1
B
Carrying case
1
C
Impact sockets
11/16"
3/4"
13/16"
7/8"
1
1
1
1
Owner’s manual
1
Front
housing
Socket
retainer
Handle
Forward/reverse
switch
½" square
drive

10
INSTALL SOCKET
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.
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.
ASSEMBLY AND OPERATION
CARTON CONTENTS
!
Fig. 1

11
FORWARD/REVERSE SWITCH
This impact wrench is equipped with a
rocker style forward/reverse switch (1) (see
Fig. 2).
1. To operate the impact wrench in the
forward direction, press and hold the
bottom part of the switch (2). This
direction of rotation will tighten the
fastener.
2. To operate the impact wrench in the
reverse direction, press and hold the
top part of the switch (3). This direction
of rotation will loosen the fastener.
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
Have you read “POWER TOOL
SAFETY”, “SPECIFIC SAFETY
RULES”, EXTENSION CORD
SAFETY” and “SYMBOLS” on pages
3, 4, 5, 6, 7 & 8 of this Manual? If not,
please do it now before you operate
this impact wrench. Your safety
depends on it!
Every time you use the impact
wrench you should verify the
following:
1. Safety glasses, hearing
protection and gloves are being
worn.
2. Socket is the correct size and is
“impact wrench” rated.
3. Socket is in good condition.
Failure to adhere to these safety
rules can greatly increase the
chances of injury.
WARNING
!
!
Fig. 2

12
REMOVING FASTENERS –cont’d
1. Install the correct size of impact socket
on the impact wrench as outlined on
Page 10.
2. Plug the impact wrench power cord
into an appropriate power source.
3. Grasp the impact wrench handle (1)
with one hand and the front housing of
the impact wrench (2) with the other
hand (see Fig. 3).
4. 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.
5. While holding the tool level with the
ground and with a firm grasp, pull on
the top part of the forward/reverse
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.
ASSEMBLY AND OPERATION
!
Fig. 3

13
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
!
!
!

14
PARTS DIAGRAM –MODEL 54-2734-4

15
WARNING: When servicing, use only Mastercraft®replacement parts. Use of
any other parts may create a safety hazard or cause damage to the tool.
Any attempt to repair or replace electrical parts on this power tool may create a
safety hazard unless repair is performed by a qualified technician.
Always order by PART NUMBER, not by key number.
Key #
Part #
Part Name
Quantity
1
012009-01
Gear case
1
2
012009-02
Screw / T5x50
4
3
012009-03
Bearing & seal
1
4
012009-04
Anvil assembly
1
5
012009-05
Impactor
1
6
012009-06
Seal ball / ø5
23
7
012009-07
Spring
1
8
012009-08
Steel ball / ø7.14
2
9
012009-09
Drive spindle
1
10
012009-10
Gear
1
11
012009-11
Washer (ø8xø16x0.5)
3
12
012009-12
Impact washer
1
13
012009-13
Bearing
1
14
012009-14
Gasket
1
15
012009-15
Gear case cover
1
16
012009-16
O-ring (ø27.6x2)
1
17
012009-17
Ball bearing / 6001.2Z
1
18
012009-18
Circlip for hole / ø28
1
19
012009-19
Armature
1
20
012009-20
Ball bearing / 608.2Z
1
21
012009-21
Spindle
1
22
012009-22
Needle bearing (HK081210)
2
23
012009-23
Gear & pinion
1
24
012009-24
Fan baffle
1
25
012009-25
Screw / ST3.9x55F
2
26
012009-26
Stator
1
27
012009-27
Rubber ring
1
28
012009-28
Trade mark
1
29
012009-29
Brush cap
2
30
012009-30
Brush assembly
2
!
PARTS LIST –MODEL 54-2734-4

16
Key #
Part #
Part Name
Quantity
31
012009-31
Brush holder
2
32
012009-32
Housing
1
33
012009-33
Name plate
1
34
012009-34
Screw / ST3.9x18F
2
35
012009-35
Handle cover
1
36
012009-36
Switch (HY29C)
1
37
012009-37
Screw / ST3.9x16C
2
38
012009-38
Cord clamp
1
39
012009-39
Cord sheath
1
40
012009-40
Cord
1
41
012009-41
Felt ring
1
42
012009-42
Back base
1
43
012009-43
Screw / ST3.9x16F
4
44
012009-44
Spring washer / ø5
4
45
012009-45
Plain washer / ø5
4
46
012009-46
Sealing ring bushing
1
47
012009-47
Thrust washer (ø44xø26x2.5)
1
48
012009-48
Check ring
1
49
012009-49
O-ring (ø8x1.5)
1
50
012009-50
Washer (ø16x7.2)
1
PARTS LIST –MODEL 54-2734-4
This symbol
designates
that this tool
is listed with
both
Canadian and
U.S.
requirements
by
Underwriters
Laboratories.