Northern Industrial Tools 150611 User manual

PRODUCT SPECIFICATIONS
SAVE THIS MANUAL
You will need this manual for the safety warnings and precautions, assembly, operating,
inspection, maintenance and cleaning procedures, parts list and assembly diagram.
Keep your invoice with this manual. Write the invoice number on the inside of the front
cover. Keep this manual and invoice in a safe and dry place for future reference.
GENERAL SAFETY RULES
WARNING!
READ AND UNDERSTAND ALL INSTRUCTIONS
Failure to follow all instructions listed in the following
pages may result in electric shock, fire, and/or serious injury.
SAVE THESE INSTRUCTIONS
UNPACKING
When unpacking, check to make sure all the parts shown on the Parts List on page 12
are included. If any parts are missing or broken, please call Harbor Freight Tools at the
number shown on the cover of this manual as soon as possible.
noitpircseDmetI
Electrical
Requirem ents
120V / 60 Hz / 8.5 AM Ps.
Pow er Plug Type: 2 Prong, P olarized.
Pow er Switch Type: Rocker w/Forward &
Reverse.
Drive Size 3/4".
Im pacts Per Minute 1700 BPM.
Ft./Lbs. Torque 400 Ft./Lbs.
Construction Poly-Plastic, High Carbon Steel.
Cast Aluminum, Rubber.
Unit W eight 12.7 6 Pounds.
2

3. Keep bystanders, children, and visitors away while operating a power tool.
Distractions can cause you to lose control. Protect others in the work area from
debris such as chips and sparks. Provide barriers or shields as needed.
PERSONAL SAFETY
1. Stay alert. Watch what you are doing, 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 power tools may result in serious personal injury.
2. Dress properly. Do not wear loose clothing 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.
3. Avoid accidental starting. Be sure the Power Switch is off before plugging
in. Carrying power tools with your finger on the Power Switch, or plugging in
power tools with the Power Switch on, invites accidents.
4. Remove adjusting keys or wrenches before turning the power tool on. A
wrench or a key that is left attached to a rotating part of the power tool may result
in personal injury.
5. Do not overreach. Keep proper footing and balance at all times. Proper
footing and balance enables better control of the power tool in unexpected
situations.
6. Use safety equipment. Always wear ANSI approved safety goggles
underneath a full face shield, a dust mask or respirator, and hearing
protection.
TOOL USE AND CARE
1. Use clamps or other practical ways to secure and support the workpiece to
a stable platform. Holding the work by hand is unstable and may lead to loss of
control. Only work on a workpiece that is properly secured.
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 flammables.
1. Keep your work area clean and well lit. Cluttered benches and dark areas
invite accidents.
WORK AREA
3

2. 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 is designed.
3. Do not use the power tool if the Power Switch does not turn it on or off.
Any tool that cannot be controlled with the Power Switch is dangerous and must
be replaced.
4. Disconnect the Power Cord 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.
5. Store idle tools out of reach of children and other untrained persons. Tools
are dangerous in the hands of untrained users.
6. Maintain tools with care. Do not use a damaged tool. Tag damaged tools “Do
not use” until repaired.
7. Check for misalignment or binding of moving parts, breakage of parts,
cracking or breakage of the Cut-Off Wheel, 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.
8. 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
1. Tool service must be performed only by qualified repair personnel. Service
or maintenance performed by unqualified personnel could result in a risk of injury.
2. When servicing a tool, use only identical replacement parts. Follow
instructions in the
“Inspection, Maintenance, And Cleaning”
section of this
manual. Use of unauthorized parts or failure to follow maintenance instructions
may create a risk of electric shock or injury.
1. Grounded tools must be plugged into an outlet properly installed and
grounded in accordance with all codes and ordinances. Never remove the
grounding prong or modify the plug in any way. Do not use any adapter
plugs. Check with a qualified electrician if you are in doubt as to whether
the outlet is properly grounded. If the tools should electrically malfunction or
ELECTRICAL SAFETY
4

break down, grounding provides a low resistance path to carry electricity away
from the user.
2. Double insulated tools are equipped with 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, reverse the plug. If it still does
not fit, contact a qualified electrician to install a polarized outlet. Do not
change the plug in any way. Double insulation eliminates the need for the
three wire grounded power cord and grounded power supply system.
3. Avoid body contact with grounded surfaces such as pipes, radiators,
ranges, and refrigerators. There is an increased risk of electric shock if your
body is grounded.
4. Do not expose power tools to rain or wet conditions. Water entering a power
tool will increase the risk of electric shock.
5. Do not abuse the Power Cord. Never use the Power Cord to carry the tools
or pull the Plug from an outlet. Keep the Power Cord away from heat, oil,
sharp edges, or moving parts. Replace damaged Power Cords immedi-
ately. Damaged Power Cords increase the risk of electric shock.
6. When operating a power tool outside, use an outdoor extension cord
marked “W-A” or “W”. These extension cords are rated for outdoor use, and
reduce the risk of electric shock.
GROUNDING
WARNING!
Improperly connecting the grounding wire can result in the risk of electric
shock. Check with a qualified electrician if you are in doubt as to whether the
outlet is properly grounded. Do not modify the power cord plug provided with
the tool. Never remove the grounding prong from the plug. Do not use the
tool if the power cord or plug is damaged. If damaged, have it repaired by
a service facility before use. If the plug will not fit the outlet, have a proper
outlet installed by a qualified electrician.
DOUBLE INSULATED TOOLS: TOOLS WITH TWO PRONG PLUGS
1. Tools marked “Double Insulated” do not require grounding. They have a special
double insulation system which satisfies OSHA requirements and complies with
5

the applicable standards of Underwriters Laboratories, Inc., the Canadian
Standard Association, and the National Electrical Code. (See Figure A.)
2. Double insulated tools may be used in either of the 120 volt outlets shown in the
following illustration. (See Figure A.)
EXTENSION CORDS
1.
Double Insulated
tools can use either a two or three wire extension cord.
2. As the distance from the supply outlet increases, you must use a heavier gauge
extension cord. Using extension cords with inadequately sized wire causes a
serious drop in voltage, resulting in loss of power and possible tool damage.
(See Figure B, next page.)
3. The smaller the gauge number of the wire, the greater the capacity of the cord.
For example, a 14 gauge cord can carry a higher current than a 16 gauge cord.
(See Figure B.)
4. When using more than one extension cord to make up the total length, make
sure each cord contains at least the minimum wire size required.
(See Figure B.)
FIGURE A
5. If you are using one extension cord for more than one tool, add the nameplate
amperes and use the sum to determine the required minimum cord size.
(See Figure B.)
6. If you are using an extension cord outdoors, make sure it is marked with the
suffix “W-A” (“W” in Canada) to indicate it is acceptable for outdoor use.
6

7. Make sure your extension cord is properly wired and in good electrical condition.
Always replace a damaged extension cord or have it repaired by a qualified
electrician before using it.
8. Protect your extension cords from sharp objects, excessive heat, and damp or
wet areas.
SYMBOLOGY
V ~
A
xxxx/min.
FIGURE C
no
Double Insulated
Canadian Standards
Association
Underwriters
Laboratories, Inc.
Volts Alternating
Current
Amperes
No Load Revolutions
Per Minute (RPM)
RECOMMENDED MINIMUM WIRE GAUGE FOR EXTENSION CORDS*
(120 VOLT)
NAMEPLATE
AMPERES
(At Full Load)
EXTENSION CORD LENGTH
25
FEET
50
FEET
75
FEET
100
FEET
150
FEET
0-2.0 18 18 18 18 16
2.1-3.4 18 18 18 16 14
3.5-5.0 18 18 16 14 12
5.1-7.0 18 16 14 12 12
7.1-12.0 16 14 12 10 -
12.1-16.0 14 12 10 - -
16.1-20.0 12 10 - - -
*Based on limiting the line voltage drop
to five volts at 150% of the rated amperes.
FIGURE B
7

SPECIFIC SAFETY RULES
1. Maintain labels and nameplates on the Impact Wrench. These carry important
information. If unreadable or missing, contact Harbor Freight Tools for a
replacement.
8
2. When using the Impact Wrench, always maintain a firm grip on the tool with
both hands (one hand on side handle and one on main handle).
3. Do not use the Impact Wrench if it has been dropped, damaged, left
outdoors, or immersed in liquid.
4. To avoid electrical shock, do not pull or carry the Impact Wrench by its
Power Cord or pull the Power Cord around sharp corners or edges. Do not
unplug the Impact Wrench by pulling on the Power Cord. Keep the Power Cord
away from heated surfaces.
5. To avoid electrical shock, do not handle the Impact Wrench with wet hands.
6. Keep the Handle of the Impact Wrench dry, clean, free from oil and
grease.
7. Always turn off the Impact Wrench and unplug the tool from its electrical
outlet before changing accessories or performing any inspection,
maintenance, or cleaning procedures.
8. Industrial applications must follow OSHA requirements.
9. Use the right tool or attachment for the right job. Do not attempt to force a
small tool or attachment to do the work of a larger industrial tool or attachment.
There are certain applications for which this product was designed. It will do the
job better and more safely at the rate for which it was intended. Do not modify
this product, and do not use this product for a purpose for which it was not
intended.
10. WARNING! People with pacemakers should consult their physician(s)
before using this product. Operation of electrical equipment in close proximity to
a heart pacemaker could cause interference or failure of the pacemaker.
11. WARNING! The warnings, precautions, and instructions discussed in this
manual cannot cover all possible conditions and situations that may occur. The
operator must understand that common sense and caution are factors which
cannot be built into this product, but must be supplied by the operator.

9
NOTE: For additional information regarding the parts listed in the following pages, refer
to the Assembly Diagram on page 13.
1. WARNING! Always make sure the Rocker Switch (39) of the Impact
Wrench is in its “OFF” position and the tool is unplugged from its electrical outlet
prior to making any adjustments to the tool. (See Figure D.) Note: When your
finger is off the Rocker Switch (39), the tool is in the “OFF” position.
2. Rocker Switch (39): The Rocker Switch is operated
manually
simply by squeezing
the Switch to turn on the Impact Wrench and releasing pressure on the Switch to
turn off the Impact Wrench. The Rocker Switch features a forward/reverse mechanism
which allows you to change the rotational direction of the Impact Wrench. For
a
clockwise
rotation, squeeze the lower portion of the Rocker Switch. For a
counterclockwise
rotation, squeeze the upper portion of the Rocker Switch. To
avoid damage to the Impact Wrench, always wait until the tool completely stops
before changing rotational directions. (See Figure D.)
3. 3/4" Impact Head (10): The 3/4" Impact Head features a spring and ball clip
to securely hold a socket. The Impact Head accepts all sizes of standard and
metric sockets having a 3/4" drive. (See Figure D.)
PRODUCT FEATURES
IMPACT HEAD
(10)
ROCKER SWITCH
(39)
FORWARD (CLOCKWISE)
REVERSE (COUNTERCLOCKWISE)
FIGURE D
POWER CORD
(46)

OPERATING INSTRUCTIONS
1. Before installing a socket (not included), turn off the Impact Wrench and unplug the
tool from its electrical outlet before changing accessories. Then, firmly insert a
3/4" drive socket (not included) onto the 3/4" Impact Head (10) of the tool. Note: Only
use impact sockets with this tool. (See Figure D.)
2. Whenever possible, secure the workpiece in place, using a vise or clamps (not
included).
3. Insert the socket onto the nut that is to be loosened/tightened.
1. WARNING! Always make sure the Rocker Switch (39) is in its “OFF”
position, and unplug the Power Cord (46) from its 120 volt electrical outlet
before performing any inspection, adjustments, maintenance, or cleaning.
10
4. Plug the Power Cord (46) of the Impact Wrench into the nearest 120 volt,
grounded, electrical outlet. (See Figure D.)
5. Make sure to hold the Impact Wrench firmly with both hands, as torque from the
Motor will cause the tool to twist. Then squeeze the
upper
portion of the Rocker
Switch (39) to
loosen
the nut, or squeeze the
lower
portion of the Rocker Switch
to
tighten
the nut. (See Figure D.)
6. When finished, release the Rocker Switch (39) to stop the Impact Wrench. Then,
unplug the Power Cord (46) from its electrical outlet. (See Figure D.)
7. Make sure to store the Impact Wrench in its Carrying Case (57) and in a dry,
clean, location out of reach of children and other unauthorized people.
INSPECTION, MAINTENANCE, AND CLEANING
2. Before each use: Inspect the general condition of the Impact Wrench. Check
for loose screws, misalignment or binding of moving parts, cracked or broken
parts, damaged electrical wiring, and any other condition that may affect its safe
operation. If abnormal noise or vibration occurs, have the problem corrected
before further use. Do not use damaged equipment.
3. Daily: Use a clean cloth and mild detergent to remove all dirt and debris from
the Impact Wrench. Do not use solvents. Do not immerse the Impact Wrench in
any liquid.

4. To replace the Motor Carbon Brushes: It may become necessary at sometime
to replace the
two
Carbon Brushes (49) when the Motor performance decreases,
or stops working completely. The Carbon Brushes are located on each side of
the Field Case (31). To do so, remove the two Brush Cap Covers (51). Next,
remove the two Brush Caps (50). Then, remove the two Carbon Brushes (49). If
the Carbon Brushes are worn down more than 1/2, replace
both
Carbon Brushes.
If, however, the Carbon Brushes are just dirty they may be cleaned by rubbing
them with a pencil eraser. When installing the Carbon Brushes, make sure the
carbon portion of the Carbon Brushes contact the Motor Armature, and that the
springs face away from the Motor. Also, make sure the springs operate freely.
After cleaning or replacement, replace the Brush Caps (50) and Brush Cap
Covers (51). NOTE: New Carbon Brushes tend to arc or spark when first
used
until
they wear and conform to the Motor’s Armature. (See Figure E.)
5. WARNING! All maintenance, service, and repairs not listed in this
manual are only to be attempted by a qualified technician.
11
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY
DIAGRAM IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR
DISTRIBUTOR MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT HE
OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT HE OR SHE IS QUALIFIED
TO REPLACE ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER AND/OR DISTRIBUTOR
EXPRESSLY STATES THAT ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY
CERTIFIED AND LICENSED TECHNICIANS, AND NOT BY THE BUYER. THE BUYER ASSUMES ALL
RISK AND LIABILITY ARISING OUT OF HIS OR HER REPAIRS TO THE ORIGINAL PRODUCT OR
REPLACEMENT PARTSTHERETO, OR ARISING OUT OF HIS OR HER INSTALLATION OF REPLACEMENT
PARTS THERETO.
RIGHT SIDE LEFT SIDE
BRUSH CAP COVER (51)
BRUSH CAP (50)
CARBON BRUSH (49)
FIGURE E

PARTS LIST
NOTE:
Some parts are listed and shown for illustration purposes only,
and are not available individually as replacement parts.
12
Part # Description Qty. Part # Description Qty.
4gniniL921revoCnoitcetorP1
1lebaL031gniR-O2
3 Bearing 1 31 Field Case 1
4 Band 1 32 Screw (M5 x 8) 2
5 Gear Box 1 33 Washer (M5) 4
6 Inner Gear 1 34 Hex Bolt (M5 x 60) 4
7 Compression Spring 1 35 End Cap 1
8 Pin (2 x 10) 1 36 Screw (ST4.2 x 16-F-H) 2
9 Spring Pin 1 37 Screw (ST4.2 x 19-F-H) 2
10 Impact Head 1 38 Handle Cover 1
11 Impactor 1 39 Rocker Switch 1
12 Steel Ball (5/32") 22 40 Switch Holder 1
13 Spring 1 41 Capacitor 1
14 Steel Ball (9/32") 2 42 Terminal Post 1
15 Spindle 1 43 Screw (ST4.2 x 16-F-H) 2
16 Gear 2 44 Cord Clamp 1
1htaehSdroC542niP71
18 Washer 1 46 Power Cord 1
19 Bearing (61910-2Z) 1 47 Name Plate 1
20 O-Rubber Sealing Ring 1 48 Brush Holder 2
21 Inner Cover 1 49 Carbon Brush 2
22 Fan Baffle 1 50 Brush Cap 2
23 Bearing (6200-2RS) 1 51 Brush Cap Cover 2
24 Armature 1 52 Screw (ST4.2 x 9.5-F-H) 2
25 Bearing (608-2Z) 1 53 Four Corners Bolt 1
26 Screw (5 x 70) 2 54 Handle Holder 1
27 Washer (M5) 2 55 Rod Holder 1
28 Field 1 56 Side Handle 1

ASSEMBLY DIAGRAM
13
NOTE:
Some parts are listed and shown for illustration purposes only,
and are not available individually as replacement parts.
49
50
51
52