Chicago Electric DEMOLITION HAMMER 93853 Installation manual

DEMOLITION HAMMER
Model 93853
SET UP AND OPERATING INSTRUCTIONS
Visit our website at: http://www.harborfreight.com
Read this material before using this product.
Failure to do so can result in serious injury.
SAVE THIS MANUAL.
Copyright©2006 by Harbor Freight Tools®. All rights reserved. No portion of this manual or any artwork
contained herein may be reproduced in any shape or form without the express written consent of Harbor
Freight Tools. Diagrams within this manual may not be drawn proportionally. Due to continuing improve-
ments, actual product may differ slightly from the product described herein. Tools required for assembly
and service may not be included.
For technical questions or replacement parts, please call 1-800-444-3353.
Revised Manual 10d

SKU 93853 For technical questions, please call 1-800-444-3353 PAGE 2
SPECIFICATIONS
Electrical Requirements 120 V~ / 60 Hz / 1500 W
20 A (Start Up) / 9.5 A (No Load) / 13.0 A (With Load)
Power Cord Type: 82” Long / 14 AWG x 2C
Power Cord Plug Type: 2-Prong / Polarized
Power Switch Type: 2-Position Toggle Switch w/Slider Cover
Blows Per Minute 900 ~ 1800 BPM (Using Variable Speed Dial)
Variable Speed Settings 1-2-3-4-5-6
Handle Types Fixed Main Rear Handle (7” x 4-1/4” x 1-3/8”)
Rotating Swivel “D” Style Auxiliary Handle (6” x 5” x 1-1/4”)
Included Chisels Bull Point (13-7/8” Long / Qty. 1)
Spade (1” Wide x 13-7/8” Long / Qty. 1)
Chisel Shank Size 45/64” Diameter
Chisel Retainer Quick-Release Retainer
Note: SDS and SDS MAX chisels (both not included) can be used with this Demolition
Hammer.
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 all instructions
Failure to follow all instructions listed below may result in electric shock,
re, and/or serious injury. The term “power tool” in all of the warnings listed
below refers to your line-operated (corded) power tool or battery-operated
(cordless) power tool.
SAVE THESE INSTRUCTIONS
WORK AREA
Keep your work area clean and well lit.1. Cluttered benches and dark areas
invite accidents.
Do not operate power tools in explosive atmospheres, such as in the2.
presence of ammable liquids, gases, or dust. Power tools create sparks
which may ignite the dust or fumes.
Keep bystanders, children, and visitors away while operating a power tool.3.
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.
REV 06f

SKU 93853 For technical questions, please call 1-800-444-3353 PAGE 3
ELECTRICAL SAFETY
Grounded tools must be plugged into an outlet properly installed and1.
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 qualied electrician if you are in doubt as to whether
the outlet is properly grounded. If the tools should electrically malfunction or
break down, grounding provides a low resistance path to carry electricity away
from the user.
Double insulated tools are equipped with a polarized plug (one blade is2.
wider than the other). This plug will t in a polarized outlet only one way.
If the plug does not t fully in the outlet, reverse the plug. If it still does
not t, contact a qualied 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.
Avoid body contact with grounded surfaces such as pipes, radiators,3.
ranges, and refrigerators. There is an increased risk of electric shock if your
body is grounded.
Do not expose power tools to rain or wet conditions.4. Water entering a power
tool will increase the risk of electric shock.
Do not abuse the Power Cord.5. 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
immediately. Damaged Power Cords increase the risk of electric shock.
When operating a power tool outside, use an outdoor extension cord6.
marked “W-A” or “W”. These extension 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 when1.
operating a power tool. Do not use a power tool while tired or under the
inuence 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 jewelry. Contain long2.
hair. Keep your hair, clothing, and gloves away from moving parts. Loose
clothes, jewelry, or long hair can be caught in moving parts.
Avoid accidental starting.3. Be sure the Power Switch is off before plugging
in. Plugging in power tools with the Power Switch on invites accidents.

SKU 93853 For technical questions, please call 1-800-444-3353 PAGE 4
Remove adjusting keys or wrenches before turning the power tool on.4. A
wrench or a key that is left attached to a rotating part of the power tool may result
in personal injury.
Do not overreach. Keep proper footing and balance at all times.5. Proper
footing and balance enables better control of the power tool in unexpected
situations.
Use safety equipment. Always wear eye protection.6. Dust mask, non-skid
safety shoes, hard hat, or hearing protection must be used for appropriate
conditions.
TOOL USE AND CARE
Use clamps (not included) or other practical ways to secure and support1.
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.2. The correct
tool will do the job better and safer at the rate for which it is designed.
Do not use the power tool if the Power Switch does not turn it on or off.3.
Any tool that cannot be controlled with the Power Switch is dangerous and must
be replaced.
Disconnect the Power Cord Plug from the power source before making any4.
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.5. Tools
are dangerous in the hands of untrained users.
Maintain tools with care. Keep cutting tools sharp and clean.6. Properly
maintained tools with a sharp cutting edge are less likely to bind and are easier
to control. Do not use a damaged tool. Tag damaged tools “Do not use” until
repaired.
Check for misalignment or binding of moving parts, breakage of parts,7.
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 your8.
model. Accessories that may be suitable for one tool may become hazardous
when used on another tool.

SKU 93853 For technical questions, please call 1-800-444-3353 PAGE 5
SERVICE
Tool service must be performed only by qualied repair personnel. 1. Service
or maintenance performed by unqualied personnel could result in a risk of injury.
When servicing a tool, use only identical replacement parts. Follow2.
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.
SPECIFIC SAFETY RULES
Maintain labels and nameplates on the Demolition Hammer.1. These carry
important information. If unreadable or missing, contact Harbor Freight Tools for
a replacement.
Always wear ANSI-approved safety impact eye glasses and a full face2.
shield when using the Demolition Hammer. Also wear heavy-duty steel-toe
boots, hearing protection, dust mask or respirator, and heavy duty work gloves.
Using personal safety devices reduce the risk for injury.
Maintain a safe working environment.3. Keep the work area well lit. Make
sure there is adequate surrounding workspace. Always keep the work area free
of obstructions, grease, oil, trash, and other debris. Do not use a power tool in
areas near ammable chemicals, dusts, and vapors. Do not use this product in a
damp or wet location.
Avoid unintentional starting.4. Make sure you are prepared to begin work before
turning on the Demolition Hammer.
Do not force the Demolition Hammer.5. This tool will do the work better and
safer at the speed and capacity for which it was designed.
Keep hands, ngers, and feet safely away from the cutting area.6.
Never leave the Demolition Hammer unattended when it is plugged into an7.
electrical outlet. Turn off the tool, and unplug it from its electrical outlet before
leaving.
Before using the Demolition Hammer, check to make sure the Chisel is8.
properly mounted in the Slider of the tool. Make sure the Chisel is sharp, and
is not cracked or bent.
Industrial applications must follow OSHA guidelines.9.
Always hold the Demolition Hammer10. with both hands by its insulated
gripping surfaces; this offers protection against electrical shock, if the
tool’s Chisel contacts hidden wiring or its own Power Cord.

SKU 93853 For technical questions, please call 1-800-444-3353 PAGE 6
Do not drill or break into existing walls, oors, or other blind areas where 11.
electrical wiring may exist. If this situation is unavoidable, disconnect all fuses
or circuit breakers feeding the worksite.
Use a metal detector to determine if there are gas or water pipes hidden12.
in the work area or call the local utility company for assistance before
beginning the operation. Striking or cutting into a gas line will result in
explosion. Water entering an electrical device may cause electrocution.
Position yourself to avoid being caught between the Demolition Hammer13.
or Auxiliary Handle and walls or posts. Should the Chisel become bound or
jammed in the work, the reaction of the tool could crush your hand or leg.
Do not strike the Chisel with a handheld hammer or sledge hammer when14.
attempting to dislodge a bound or jammed Chisel. Fragments of metal from
the Chisel could dislodge and strike you or bystanders.
Never place the Demolition Hammer down until the Motor has come to a15.
complete stop.
The Chisel may become hot after prolonged use.16. When removing the Chisel
from the tool, avoid contact with skin and use proper protective gloves when
grasping the Chisel.
Do not force the Chisel into the workpiece when cutting.17. Apply moderate
pressure, allowing the Chisel to cut without being forced.
Never attempt to remove material stuck in the moving parts of the18.
Demolition Hammer while it is plugged in and running.
Always unplug the Demolition Hammer from its electrical outlet before19.
performing and inspection, maintenance, or cleaning procedures.
Keep this product and all other tools and equipment away from children20.
and other unauthorized people. Do not allow spectators in the work area.
Performance of this tool (if powered by line voltage) may vary depending21.
on variations in local line voltage. Extension cord usage may also affect
tool performance.
Use the right tool for the job.22. Do not attempt to force a small tool to do the
work of a larger industrial tool. There are certain applications for which this tool
was designed. It will do the job better and more safely at the rate for which it was
intended. Do not modify this tool, and do not use this tool for a purpose for which
it is not intended.
WARNING!23. Some dust created by power sanding, sawing, grinding, drilling, and
other construction activities, contain chemicals known (to the State of California)
to cause cancer, birth defects or other reproductive harm. Some examples of

SKU 93853 For technical questions, please call 1-800-444-3353 PAGE 7
these chemicals are: lead from lead-based paints, crystalline silica from bricks
and cement or other masonry products, arsenic and chromium from chemically
treated lumber. Your 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 those
dust masks that are specially designed to lter out microscopic particles.
(California Health & Safety Code § 25249.5, et seq.)
People with pacemakers should consult their physician(s) before use.24.
Electromagnetic elds in close proximity to heart pacemaker could cause
pacemaker interference or pacemaker failure. In addition, people with
pacemakers should:
• Avoid operating alone.
• Don’t use with power switch locked on.
• Properly maintain and inspect to avoid electrical shock.
• Any power cord must be properly grounded. Ground Fault Circuit Interrupter
(GFCI) should also be implemented – it prevents sustained electrical shock.
25. WARNING! The warnings and cautions discussed in this manual cannot cover
all possible conditions and situations that may occur. It must be understood by
the operator that common sense and caution are factors which cannot be built
into this product, but must be supplied by the operator.
SAVE THESE INSTRUCTIONS

SKU 93853 For technical questions, please call 1-800-444-3353 PAGE 8
VIBRATION HAZARD
This tool vibrates during use. Repeated or long-term exposure to vibration may
cause temporary or permanent physical injury, particularly to the hands, arms
and shoulders. To reduce the risk of vibration-related injury:
Anyone using vibrating tools regularly or for an extended period should rst 1.
be examined by a doctor and then have regular medical check-ups to ensure
medical problems are not being caused or worsened from use. Pregnant women
or people who have impaired blood circulation to the hand, past hand injuries,
nervous system disorders, diabetes, or Raynaud’s Disease should not use this
tool. If you feel any medical or physical symptoms related to vibration (such as
tingling, numbness, and white or blue ngers), seek medical advice as soon as
possible.
Do not smoke during use. Nicotine reduces the blood supply to the hands and2.
ngers, increasing the risk of vibration-related injury.
Wear suitable gloves to reduce the vibration effects on the user.3.
Use tools with the lowest vibration when there is a choice between different4.
processes.
Include vibration-free periods each day of work.5.
Grip tool as lightly as possible (while still keeping safe control of it). Let the tool6.
do the work.
To reduce vibration, maintain the tool as explained in this manual. If any7.
abnormal vibration occurs, stop use immediately.
REV 07j

SKU 93853 For technical questions, please call 1-800-444-3353 PAGE 9
GROUNDING
Improperly connecting the grounding wire can result in
electric shock.
Check with a qualied 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
t the outlet, have a proper outlet installed by a qualied
electrician.
Grounded Tools: Tools with Three Prong Plugs
Tools marked with “Grounding Required” have a three wire cord and three prong1.
grounding plug. The plug must be connected to a properly grounded outlet. If
the tool should electrically malfunction or break down, grounding provides a low
resistance path to carry electricity away from the user, reducing the risk of electric
shock. (See 3-Prong Plug and Outlet.)
The grounding prong in the plug is connected through the green wire inside the2.
cord to the grounding system in the tool. The green wire in the cord must be the
only wire connected to the tool’s grounding system and must never be attached
to an electrically “live” terminal. (See 3-Prong Plug and Outlet.)
The tool must be plugged into an appropriate outlet, properly installed and3.
grounded in accordance with all codes and ordinances. The plug and outlet
should look like those in the following illustration.
(See 3-Prong Plug and Outlet.)
3-Prong Plug and Outlet Outlets for 2-Prong Plug
Double Insulated Tools: Tools with Two Prong Plugs
Note: This product uses a 2-prong plug.
Tools marked “Double Insulated” do not require grounding. They have a special1.
double insulation system which satises OSHA requirements and complies
WARNING

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with the applicable standards of Underwriters Laboratories, Inc., the Canadian
Standard Association, and the National Electrical Code.
(See Outlets for 2-Prong Plug.)
Double insulated tools may be used in either of the 120 volt outlets shown in the2.
preceding illustration. (See Outlets for 2-Prong Plug.)
Extension Cords
Grounded1. tools require a three wire extension cord. Double Insulated tools can
use either a two or three wire extension cord.
As the distance from the supply outlet increases, you must use a heavier gauge2.
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 Table A.)
The smaller the gauge number of the wire, the greater the capacity of the cord.3.
For example, a 14 gauge cord can carry a higher current than a 16 gauge cord.
(See Table A.)
When using more than one extension cord to make up the total length, make4.
sure each cord contains at least the minimum wire size required. (See Table A.)
If you are using one extension cord for more than one tool, add the nameplate5.
amperes and use the sum to determine the required minimum cord size.
(See Table A.)
If you are using an extension cord outdoors, make sure it is marked with the6.
sufx “W-A” (“W” in Canada) to indicate it is acceptable for outdoor use.
Make sure the extension cord is properly wired and in good electrical condition.7.
Always replace a damaged extension cord or have it repaired by a qualied
electrician before using it.
Protect the extension cords from sharp objects, excessive heat, and damp or wet8.
areas.

SKU 93853 For technical questions, please call 1-800-444-3353 PAGE 11
RECOMMENDED MINIMUM WIRE GAUGE FOR EXTENSION CORDS* (120/240 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 18 14 12 10 -
12.1 – 16.0 14 12 10 - -
16.1 – 20.0 12 10 - - -
TABLE A * Based on limiting the line voltage drop to ve volts at 150% of the rated amperes.
Symbology
Double Insulated V~ Volts Alternating Current
Canadian Standards Association AAmperes
Underwriters Laboratories, Inc. n0xxxx/min. No Load Revolutions per Minute
(RPM)

SKU 93853 For technical questions, please call 1-800-444-3353 PAGE 12
UNPACKING
When unpacking, check to make sure all the parts shown on the Parts List on page
16 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.
PRODUCT FEATURES
Note: For additional information regarding the parts listed in the following pages, refer
to the Assembly Diagrams on page 17.
CAUTION! Always make sure the Power Switch (66) of the Demolition Hammer is
in its “OFF” position and the tool is unplugged from its electrical outlet prior to
adding accessories or performing maintenance on the tool.
OIL CAP
(45)
SLIDER
(4)
FRONT CAP
(1)
KNOB
(105)
AUXILIARY HANDLE
(104A)
POWER SWITCH
(66)
VARIABLE
SPEED CONTROL
(72)
FIGURE E
1. Oil Cap (45): Prior to the Demolition Hammer’s rst use, remove the Oil Cap
and check to make sure the tool is properly lled with grease. If necessary, ll
the tool with approximately 1-1/4 ounces of #3 Lithium-based grease (not
included). Then, replace the Oil Cap. Thereafter, replace the grease at the end
of every 70 to 80 hours of tool use. (See Figure E.)
Power Switch (66):2. The Demolition Hammer is switched “ON” by the slide
switch located in the rear Handle (62). To turn the tool “ON”, slide the switch to
the right. To turn the tool “OFF”, slide the switch to the left. (See Figure E.)
REV10d

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Variable Speed Control (72):3. The Demolition Hammer is equipped with a
Variable Speed Control Dial. The impact rate (BPM) and rotating speed (RPM)
can be varied according to the type of work being performed by setting the
Variable Speed Control Dial to the selected setting: 1-2-3-4-5-6 (“1” Being the
lowest. “6” Being the highest.) The Variable Speed Control Dial may be
adjusted while the Motor is running with the tool free from work, allowing the
operator to adjust the impact rate and rotating speed according to the actual
application.
(See Figure E.)
Auxiliary Handle (104A) and Knob (105):4. The Demolition Hammer must
be supported with the Auxiliary Handle, which can be swiveled 360 degrees.
To reposition and/or swivel the Auxiliary Handle, loosen the Knob. Move the
Auxiliary Handle to the desired position along the barrel of the tool and rmly
retighten the Knob. (See Figure E.)
FIGURE F
SLIDER (4)
FRONT CAP
(1)
OIL OR GREASE
(NOT INCLUDED)
CHISEL
(106, 107)
CHISEL
(106, 107)
SLIDER (4)
FRONT CAP (1)
5. Front Cap (1) and Slider (4): To install a Chisel (106, 107), clean the insert
shank end of the chisel to remove any debris. Then, lightly grease the shank
with a light oil or grease. Insert the Chisel into the Slider through the Front Cap,
while twisting and pushing inward until the Chisel locks into place. Pull outward
on the Chisel to make sure it is locked into the Slider. (See Figure F.)
OPERATING INSTRUCTIONS
WARNING! Always wear ANSI-approved safety impact eye glasses and
a full face shield when using the Demolition Hammer. Also wear heavy
duty steel-toe boots, hearing protection, dust mask or respirator, and heavy
duty work gloves.
Install a Chisel (106, 107) as previously discussed.1. (See Figure F.)
Make sure the Power Switch (66) is in its “OFF” position. Then, connect the 2.
Power Cord & Plug (70) to the nearest 120 volt, grounded electrical outlet.
(See Figure E.)
REV10d

SKU 93853 For technical questions, please call 1-800-444-3353 PAGE 14
Grasp the Demolition Hammer rmly by its rear Handle (62) and Auxiliary Handle 3.
(104A). Then, turn the Power Switch (66) to its “ON” position to begin work.
IMPORTANT:4. This Demolition Hammer requires a short period of time to warm
up. Depending on the room temperature, this time may vary from approximately
15 seconds (at 90 degrees Fahrenheit) to 2 minutes (at 32 degrees Fahrenheit).
A new Hammer requires a break-in period before full performance is realized.
This period may require up to 5 hours operation. (See Figure E.)
For the best penetration rates in concrete, run the Demolition Hammer with5.
a steady pressure but do not use excessive force as this will decrease the
efciency of the tool.
If necessary, adjust the Variable Speed Control Dial (72) to increase the tool’s6.
cutting efciency. (See Figure E.)
When nished using the Demolition Hammer, turn the Power Switch (66) to its 7.
“OFF” position. Then, unplug the tool from its electrical outlet. (See Figure E.)
Allow the Chisel (106, 107) to completely cool. Then, pull and hold the locking8.
Slider (4) backward and pull the Chisel forward. The Chisel should be cleaned
after removing. (See Figure F.)
Make sure to store the Demolition Hammer in a clean, dry, safe location out of9.
reach of children and other unauthorized people.
INSPECTION, MAINTENANCE, AND CLEANING
CAUTION! Always make sure the Power Switch (66) of the Demolition Hammer is
in its “OFF” position and the tool is unplugged from its electrical outlet prior to
performing any inspection, maintenance, or cleaning.
Before each use,1. inspect the general condition of the Demolition Hammer.
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.
To replace the Motor Carbon Brushes:2. It may become necessary at sometime
to replace or clean the two Carbon Brushes (76) when the Motor performance
decreases, or stops working completely. The Carbon Brushes are located on
each side of the Motor Casing (61). To replace the Carbon Brushes, remove
the two Brush Holder Covers (79). Remove the Brush Caps (77). Then, remove
the two Carbon Brushes from the two Brush Holders (75). If the Carbon Brushes
REV10d

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are worn down, replace both Carbon Brushes. If, however, the Carbon Brushes
are just dirty they may be cleaned by rubbing them with a pencil eraser. If
cleaning and replacing used brushes, try to install them in the same holders and
in the same direction they were removed. When installing the Carbon Brushes,
make sure the carbon portion of the Carbon Brushes contact the Motor’s Rotor
and that the springs face away from the Motor. Also, make sure the springs
operate freely. After replacement or cleaning, replace the two Brush Holder
Covers. NOTE: New Carbon Brushes tend to arc or spark when rst used until
they wear and conform to the Motor’s Rotor. (See Figure G.)
Every 70 to 80 hours of tool use:3. Remove the Oil Cap (45) and replace the
grease. Fill the tool with approximately 1-1/4 ounces of #3 Lithium-based
grease (not included). Then, replace the Oil Cap. (See Figure E.)
To clean the exterior parts of the Demolition Hammer,4. use only a clean cloth
and mild detergent. Then, dry. Use a vacuum or compressed air to clean the
Motor Air Vents. Do not immerse any electrical part of the tool in any liquids.
When storing,5. store the tool in a clean, dry, safe location out of reach of children
and other unauthorized people.
CAUTION! All maintenance, service, or repairs not mentioned in this manual must
only be performed by a qualied service technician.
FIGURE G CARBON BRUSH
(76)
BRUSH HOLDER
(75)
BRUSH CAP
(77)
BRUSH HOLDER COVER
(79)

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TROUBLESHOOTING
Problem Possible Solution
Chisel installs with difculty. Make sure the Chisel shank, Front Cap, and Slider are free of debris
and lightly oiled or greased. (See page 12.)
Tool does not run. Make sure the Power Switch is in its “ON” position. (See page 11.)1.
Make sure the Power Cord & Plug is connected to a working 120 volt,2.
grounded electrical outlet. (See page 9.)
Make sure the Power Cord & Plug is not damaged.3.
Make sure the tool is lled with approximately 1-1/4 ounce of #3 4.
Lithium-base grease. (See page 11.)
Check the Motor Carbon Brushes for excessive wear and/or debris.5.
Replace or clean if necessary. (See page 14.)
Have a qualied service technician service the tool. 6.
Tool does not stop. Make sure the Power Switch is in its “OFF” position. (See page 11.)1.
Immediately disconnect the Power Cord & Plug from its electrical2.
outlet, and have a qualied service technician service the tool.
Poor cutting efciency. Make sure the Chisel is clean and sharp.1.
Adjust the Variable Speed Control Dial for the type of work being2.
done. (See page 12.)
Apply moderate pressure only. Allow the tool to do the cutting without3.
being forced.
Check the Motor Carbon Brushes for excessive wear and/or debris.4.
Replace or clean if necessary. (See page 14.)
Have a qualied service technician service the tool.5.
Tool overheats and suddenly
stops running.
Make sure the tool is lled with approximately 1-1/4 ounces of #3 1.
Lithium-base grease. (See page 11.)
Make sure the Motor Air Vents are clean and free of debris. (See2.
page 14.)
Have a qualied service technician service the tool.3.
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 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 RISKS AND LIABILITY ARISING OUT OF
HIS OR HER REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO, OR ARISING OUT
OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.

SKU 93853 For technical questions, please call 1-800-444-3353 PAGE 17
PARTS LIST
REV 06f, 08g, 10d
* Cannot be ordered individually. Must be ordered as a complete Motor Assembly. Includes parts
33, 34, 35, 36, 37, 40, 58, 59, 60, 61, 73, 74.
** Cannot be ordered individually. Must be ordered as a complete Carbon Brush Assembly.
Includes parts 75, 76, 77.
A
108 Clamping Piece 2
109* Complete Motor Assy. 1
110* Complete Carbon Brush Assy. 1

SKU 93853 For technical questions, please call 1-800-444-3353 PAGE 18
ASSEMBLY DIAGRAM
REV 08g, 10d
Note: Some parts are listed and shown for illustration purposes only, and are not available individually as
replacement parts.
106: Spade Chisel not shown. 107: Ball Point Chisel not shown.

SKU 93853 For technical questions, please call 1-800-444-3353 PAGE 19
LIMITED 1 YEAR / 90 DAY WARRANTY
Harbor Freight Tools Co. makes every effort to assure that its products meet high
quality and durability standards, and warrants to the original purchaser that for a period
of ninety days from date of purchase that the engine/motor, the belts (if so equipped),
and the blades (if so equipped) are free of defects in materials and workmanship. Harbor
Freight Tools also warrants to the original purchaser, for a period of one year from date
of purchase, that all other parts and components of the product are free from defects in
materials and workmanship (90 days if used by a professional contractor or if used as rental
equipment). This warranty does not apply to damage due directly or indirectly, to misuse,
abuse, negligence or accidents, repairs or alterations outside our facilities, normal wear and
tear, or to lack of maintenance. We shall in no event be liable for death, injuries to persons
or property, or for incidental, contingent, special or consequential damages arising from
the use of our product. Some states do not allow the exclusion or limitation of incidental or
consequential damages, so the above limitation of exclusion may not apply to you. THIS
WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR
IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us with
transportation charges prepaid. Proof of purchase date and an explanation of the complaint
must accompany the merchandise. If our inspection veries the defect, we will either
repair or replace the product at our election or we may elect to refund the purchase price
if we cannot readily and quickly provide you with a replacement. We will return repaired
products at our expense, but if we determine there is no defect, or that the defect resulted
from causes not within the scope of our warranty, then you must bear the cost of returning
the product.
This warranty gives you specic legal rights and you may also have other rights
which vary from state to state.
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • [phone]