Chicago Electric Power Hammer 97743 User Manual

ROTARY HAMMER - 1”  
Model 97743  
SET up And OpERATing inSTRucTiOnS  
Diagrams within this manual may not be drawn proportionally.  
Due to continuing improvements, actual product may differ slightly from the product described herein.  
®
distributed exclusively by Harbor Freight Tools .  
3491 Mission Oaks Blvd., Camarillo, CA 93011  
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 2008 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.  
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outlets will reduce risk of electric  
shock.  
non-skid safety shoes, hard hat, or  
hearing protection used for appropri-  
ate conditions will reduce personal  
injuries.  
b.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.  
c.prevent unintentional starting.  
Ensure the switch is in the off-po-  
sition before connecting to power  
source and/or battery pack, pick-  
ing up or carrying the tool. Carry-  
ing power tools with your finger on  
the switch or energizing power tools  
that have the switch on invites acci-  
dents.  
c.do not expose power tools to rain  
or wet conditions. Water entering  
a power tool will increase the risk of  
electric shock.  
d.do not abuse the cord. never use  
the cord for carrying, pulling or  
unplugging the power tool. Keep  
cord away from heat, oil, sharp  
edges or moving parts. Damaged  
or entangled cords increase the risk  
of electric shock.  
d.Remove any adjusting key or  
wrench before turning the power  
tool on. A wrench or a key left at-  
tached to a rotating part of the power  
tool may result in personal injury.  
e.do not overreach. Keep proper  
footing and balance at all times.  
This enables better control of the  
power tool in unexpected situations.  
e.When operating a power tool  
outdoors, use an extension cord  
suitable for outdoor use. Use of a  
cord suitable for outdoor use reduces  
the risk of electric shock.  
f. dress properly. do not wear loose  
clothing or jewelry. Keep your  
hair, clothing and gloves away  
from moving parts. Loose clothes,  
jewelry or long hair can be caught in  
moving parts.  
f. if operating a power tool in a damp  
location is unavoidable, use a  
ground Fault circuit interrupter  
(gFci) protected supply. Use of  
a GFCI reduces the risk of electric  
shock.  
g.if devices are provided for the con-  
nection of dust extraction and col-  
lection facilities, ensure these are  
connected and properly used. Use  
of these devices can reduce dust-  
related hazards.  
3. personal safety  
a.Stay alert, watch what you are do-  
ing and use common sense when  
operating a power tool. do not use  
a power tool while you are tired  
or under the influence of drugs,  
alcohol or medication. A moment  
of inattention while operating power  
tools may result in serious personal  
injury.  
h.Only use safety equipment that  
has been approved by an appropri-  
ate standards agency. Unapproved  
safety equipment may not provide  
adequate protection. Eye protection  
must be ANSI-approved and breath-  
ing protection must be NIOSH-ap-  
proved for the specific hazards in the  
work area.  
b.use personal protective equip-  
ment. Always wear eye protection.  
Safety equipment such as dust mask,  
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4. power tool use and care  
and the work to be performed.  
Use of the power tool for operations  
different from those intended could  
result in a hazardous situation.  
a.do not force the power tool. use  
the correct power tool for your  
application. The correct power tool  
will do the job better and safer at the  
rate for which it was designed.  
5. Service  
a.Have your power tool serviced by  
a qualified repair person using  
only identical replacement parts.  
This will ensure that the safety of the  
power tool is maintained.  
b.do not use the power tool if the  
switch does not turn it on and  
off. Any power tool that cannot  
be controlled with the switch is  
dangerous and must be repaired.  
c.disconnect the plug from the  
power source before making  
any adjustments, changing  
accessories, or storing power  
tools. Such preventive safety  
measures reduce the risk of starting  
the power tool accidentally.  
percussion and Rotary Hammer  
Safety Warnings  
1. Wear ear protectors. Exposure to  
noise can cause hearing loss.  
2. use auxiliary handles supplied  
with the tool. Loss of control can  
cause personal injury.  
d.Store idle power tools out of  
the reach of children and do not  
allow persons unfamiliar with the  
power tool or these instructions  
to operate the power tool. Power  
tools are dangerous in the hands of  
untrained users.  
3. Hold power tools by insulated grip-  
ping surfaces when performing an  
operation where the cutting tool  
may contact hidden wiring or its  
own cord. Contact with a ″live″ wire  
will make exposed metal parts of the  
tool ″live″ and shock the operator.  
e.Maintain power tools. check  
for misalignment or binding of  
moving parts, breakage of parts  
and any other condition that may  
affect the power tool’s operation.  
if damaged, have the power  
tool repaired before use. Many  
accidents are caused by poorly  
maintained power tools.  
4. Maintain labels and nameplates on  
the tool. These carry important safety  
information. If unreadable or missing,  
contact Harbor Freight Tools for a  
replacement.  
5. Do not operate the Rotary Hammer if  
any of the following problems occur:  
Hammer is too hot, insulation is torn,  
frayed or missing, or if excessive  
sparking occurs.  
f. Keep cutting tools sharp and  
clean. Properly maintained cutting  
tools with sharp cutting edges are  
less likely to bind and are easier to  
control.  
6. Move the Switching Knob (24) and  
Main Handle (91) only when the  
g.use the power tool, accessories  
and tool bits etc. in accordance  
with these instructions, taking into  
account the working conditions  
Motor is stopped. Attempting to move  
either one while the Motor is engaged  
will result in abrupt bit rotation, and  
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can cause serious personal injury  
and/or property damage.  
• 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.  
7. Do not allow the bit to stop while in  
the hole. Remove the bit while it is  
still rotating. If the bit stops while in  
the hole, do not restart the Rotary  
Hammer. Remove the bit from the  
Hammer, and then remove the bit  
from the workpiece.  
15. Some dust created by power  
sanding, sawing, grinding, drilling,  
and other construction activities,  
contains chemicals known [to the  
State of California] to cause cancer,  
birth defects or other reproductive  
harm. Some examples of these  
chemicals are:  
8. Always keep the Power Cord (112)  
and extension cord (if used) away  
from the moving parts of the Rotary  
Hammer.  
9. Avoid unintentional starting. Prepare  
to begin work before turning on the  
tool.  
• Lead from lead-based paints  
• Crystalline silica from bricks and  
cement or other masonry products  
• Arsenic and chromium from  
10. Do not lay the tool down until it has  
come to a complete stop. Moving  
parts can grab the surface and pull  
the tool out of your control.  
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 filter out microscopic  
particles. (California Health & Safety  
Code § 25249.5, et seq.)  
11. When using a handheld power tool,  
hold the tool with both hands to resist  
starting torque.  
12. Do not leave the tool unattended  
when it is plugged into an electrical  
outlet. Turn off the tool, and unplug  
it from its electrical outlet before  
leaving.  
16. The warnings, precautions,  
and instructions discussed in  
this instruction 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.  
13. This product is not a toy. Keep it out  
of reach of children.  
14. People with pacemakers should  
consult their physician(s) before  
use. Electromagnetic fields in close  
proximity to heart pacemaker could  
cause pacemaker interference or  
pacemaker failure. In addition,  
people with pacemakers should:  
• Avoid operating alone.  
• Do not use with power switch locked  
on.  
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abnormal vibration occurs, stop use  
immediately.  
Vibration Safety  
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:  
SAVE THESE  
inSTRucTiOnS.  
gROunding  
TO pREVEnT  
ElEcTRic SHOcK  
And dEATH FROM  
incORREcT gROunding  
WiRE cOnnEcTiOn:  
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.  
1. Anyone using vibrating tools regularly  
or for an extended period should  
first 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 fingers), seek  
medical advice as soon as possible.  
2. Do not smoke during use. Nicotine  
reduces the blood supply to the  
hands and fingers, increasing the risk  
of vibration-related injury.  
grounded Tools: Tools with Three  
prong plugs  
3. Wear suitable gloves to reduce the  
vibration effects on the user.  
4. Use tools with the lowest vibration  
when there is a choice between  
different processes.  
5. Include vibration-free periods each  
day of work.  
6. Grip tool as lightly as possible (while  
still keeping safe control of it). Let  
the tool do the work.  
3-prong plug and Outlet  
1. Tools marked with “Grounding  
Required” have a three wire cord  
7. To reduce vibration, maintain the tool  
as explained in this manual. If any  
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and three prong 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.)  
applicable standards of Underwriters  
Laboratories, Inc., the Canadian  
Standard Association, and the  
National Electrical Code. (See  
Outlets for 2-prong plug.)  
2. Double insulated tools may be used  
in either of the 120 volt outlets shown  
in the preceding illustration. (See  
Outlets for 2-prong plug.)  
2. The grounding prong in the plug is  
connected through the green wire  
inside the 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.)  
Extension cords  
1. Grounded tools require a three wire  
extension cord. 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.  
3. The tool must be plugged into an  
appropriate outlet, properly installed  
and grounded in accordance with all  
codes and ordinances. The plug and  
outlet should look like those in the  
preceding illustration. (See 3-prong  
plug and Outlet.)  
(See Table A.) 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 Table A.)  
double insulated Tools: Tools  
with Two prong plugs  
3. 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 Table A.)  
4. 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 Table A.)  
Outlets for 2-prong plug  
1. Tools marked “Double Insulated”  
do not require grounding. They  
have a special double insulation  
system which satisfies OSHA  
5. If you are using an extension cord  
outdoors, make sure it is marked with  
the suffix “W-A” (“W” in Canada) to  
requirements and complies with the  
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indicate it is acceptable for outdoor  
use.  
SpEciFicATiOnS  
Electrical  
120 V~ / 60 Hz / 620 W  
6. Make sure the 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.  
Requirements 2-Prong, Polarized Power Plug  
Speed  
n 750/min  
0
Blows Per  
Minute  
2920 BPM  
Capacity  
1”  
Chuck Type  
Rotation  
SDS  
7. Protect the extension cords from  
sharp objects, excessive heat, and  
damp or wet areas.  
Clockwise (non-reversible)  
For drilling stone, concrete, and  
other hard and brittle materials.  
For chiseling.  
Applications  
Accessories  
REcOMMEndEd MiniMuM WiRE  
gAugE FOR EXTEnSiOn cORdS*  
Wrench  
SDS Drill Bits: 10mm/12mm  
14mm/22mm  
(110/220 VOlT)  
EXTEnSiOn cORd  
nAMEplATE  
4-Point Chisel  
lEngTH  
Container of Grease  
Carbon Brush Set  
Depth Gauge Rod  
Auxiliary Handle  
Carrying Case  
AMpERES  
(at full load)  
0 – 2.0  
2.1 – 3.4  
18  
18  
18  
18  
18  
14  
12  
18  
18  
18  
16  
14  
12  
10  
18  
18  
16  
14  
12  
10  
-
18  
16  
14  
12  
10  
-
16  
14  
12  
12  
-
3.5 – 5.0  
5.1 – 7.0  
E194601  
7.1 – 12.0  
12.1 – 16.0  
16.1 – 20.0  
-
unpAcKing  
-
-
* Based on limiting the line  
voltage drop to five volts at  
150% of the rated amperes.  
When unpacking, check to make sure  
that the item is intact and undamaged. 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 pos-  
sible.  
TABlE A  
Symbology  
Double Insulated  
Canadian Standards Association  
Underwriters Laboratories, Inc.  
Volts Alternating Current  
Amperes  
V~  
A
No Load Revolutions per Minute  
(RPM)  
n xxxx/min.  
0
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SET up inSTRucTiOnS  
Read the EnTiRE iMpORTAnT SAFETY inFORMATiOn section at the  
beginning of this manual including all text under subheadings therein  
before set up or use of this product.  
TO pREVEnT SERiOuS injuRY FROM AccidEnTAl  
OpERATiOn:  
Turn the power Switch (96) of the Rotary Hammer to its “OFF” position  
and unplug the tool from its electrical outlet before assembling or  
making any adjustments to the tool.  
note: For additional information regarding the parts listed in the following pages, refer  
to the Assembly Diagram near the end of this manual.  
product Features  
FiguRE A  
SWiTcHing KnOB  
(24)  
gREASE cAp  
(18)  
SpRing  
(41)  
FROnT cOVER  
(39)  
pOWER SWiTcH  
(96)  
SElEcTOR  
HAndlE HOldER  
(91)  
(108)  
dEpTH gAugE  
(106)  
AuXiliARY HAndlE  
(107)  
BRuSH cOVER (81)  
cARBOn BRuSH (82)  
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of the Depth Gauge at that spot.  
(See Figure A.)  
Tool Set up  
Adjusting The Auxiliary Handle:  
5. After the Depth Gauge (106) is  
placed in the desired position, turn  
the Auxiliary Handle (107) clockwise  
until tight. The Depth Gauge should  
be securely in position and should not  
move. (See Figure A.)  
1. The Auxiliary Handle (107) can be  
placed in a variety of positions.  
(See Figure A.)  
2. To rotate the Auxiliary Handle  
(107), turn the Auxiliary Handle  
counterclockwise to loosen the band  
and Foursquare Bolt (111). Once  
loosened, turn the Auxiliary Handle  
to the desired position. Then turn the  
Handle clockwise to secure in place.  
(See Figure A.)  
changing The Settings:  
1. The Rotary Hammer has a Switching  
Knob (24) and a Selector (91) which  
must be adjusted before drilling,  
hammer drilling, or chiseling.  
(See Figure A.)  
using The depth gauge:  
2. WARning! Move the Switching  
Knob (24) and Selector (91)  
only when the Motor is stopped.  
Attempting to move the Switching  
Knob or Selector while the Motor  
is engaged will result in abrupt Bit  
rotation and can cause serious  
personal injury and/or property  
damage.  
1. The Depth Gauge (106) can only be  
used if the Auxiliary Handle (107) is  
positioned on either side or the top of  
the Rotary Hammer. The body of the  
Hammer will interfere with the Depth  
Gauge if the Handle is in the bottom  
position. (See Figure A.)  
2. Loosen the Auxiliary Handle (107) by  
turning the Handle counterclockwise.  
(See Figure A.)  
(See Figure A.)  
3. cAuTiOn: When moving the  
Switching Knob (24) and Main  
Handle (91), make sure both actively  
“click” into the desired position. If not  
actively engaged, the Knob or Handle  
could slip out of position resulting in  
unexpected tool performance.  
(See Figure A.)  
3. Once the Auxiliary Handle (107) is  
sufficiently loose, pull back on the  
Handle Holder (108) until the hole in  
the Handle is fully open.  
(See Figure A.)  
4. Slide the Depth Gauge (106) in to the  
desired length. The tip of the Depth  
Gauge on the front of the Hammer  
should be the desired depth of the  
hole to be drilled. The depth is from  
the tip of the Drill Bit to the tip of the  
Depth Gauge.  
4. The front Switching Knob (24) has on  
one side a symbol of a Hammer and  
a Drill. On the other side is a symbol  
of just a Hammer. (See Figure A.)  
5. The Main Handle (91) can be pointed  
either left or right. There are symbols  
for a Hammer and a Drill on the left  
For example; for a 2” deep hole,  
measure 2” back from the tip of the  
Drill Bit. Then position the front tip  
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side and a symbol for a Drill only on  
the right side. (See Figure A.)  
3. Secure loose workpieces using a vise  
or clamps (not included) to prevent  
movement while working.  
To drill only: Set the Switching  
Knob (24) so that the symbol of  
the Hammer and Drill are facing  
forward. Then turn the Selector  
(91) so that it points to the right at  
the Drill symbol. (See Figure A.)  
4. There must not be hazardous  
objects, such as utility lines or foreign  
objects, nearby that will present a  
hazard while working.  
To hammer drill: Set the Switching  
Knob (24) so that the symbol of  
the Hammer and Drill are facing  
forward. Then turn the Selector  
(91) so that it points to the left at the  
Hammer and Drill symbol.  
OpERATing inSTRucTiOnS  
Read the EnTiRE iMpORTAnT  
SAFETY inFORMATiOn section  
at the beginning of this manual  
including all text under  
subheadings therein before set  
up or use of this product.  
(See Figure A.)  
To chisel: Set the Switching Knob  
(24) so that the symbol of the  
Hammer only points forward. Then inserting and Removing drill Bits:  
turn the Selector (91) so that it  
points left to the Hammer and Drill  
symbol. (See Figure A.)  
1. cAuTiOn: Always wear heavy duty  
work gloves to provide protection  
when inserting and removing drill bits.  
Drill bits become very hot in use. Do  
nOTE: Break Point (Bull) bits and  
cold chisels should be used when  
not remove drill bits until the bit has  
the Switches are in the hammering  
completely cooled. Do not strike  
position only. Using these bits/  
stuck bits with a hammer as metal  
chips may fly off. Always disconnect  
the Power Cord (112) from its  
electrical outlet when inserting and  
chisels with the Switches in the  
Hammer/Drill position will result in  
unexpected tool performance.  
removing bits and chisels.  
Workpiece and Work Area Set up  
2. Add a light coating of grease or  
1. Designate a work area that is clean  
and well-lit. The work area must not  
allow access by children or pets to  
prevent injury and distraction.  
machine oil to the drill bit shank.  
3. Pull back on the Spring (41) while at  
the same time inserting and turning  
the Drill Bit until it slides all the way in  
the Front Cover (39). Then release  
the Spring so that it returns to its  
original position. nOTE: You should  
not be able to move the Bit without  
pulling back on the Spring again.  
Make sure the Bit does not move to  
ensure that it is properly locked in  
place. (See Figure A.)  
2. Route the Power Cord (112) along  
a safe route to reach the work area  
without creating a tripping hazard or  
exposing the Power Cord to possible  
damage. The Power Cord must  
reach the work area with enough  
extra length to allow free movement  
while working.  
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4. To remove the Drill Bit, pull back on  
the Spring (41) and pull out the Bit.  
For optimal performance, always  
keep Drill Bits and Chisels sharp.  
nOTE: When drilling a hole larger  
than 1-1/4” diameter, always use a  
Drill Bit with four cutting edges.  
(See Figure A.)  
6. Store the Rotary Hammer in its  
Carrying Case (105) and keep the  
Case in a clean, dry, safe location out  
of children’s reach.  
general Operating instructions  
1. Before plugging in the Power Cord  
(112), insert the desired Bit. Adjust  
the Auxiliary Handle (107) and Depth  
Gauge (106) to the desired positions.  
Then adjust the Switching Knob  
(24) and Selector (91) to the desired  
positions. (See Figure A.)  
2. Make sure the Power Switch (96) is  
in its “OFF” position. Then plug the  
Power Cord (112) into the nearest  
110 volt, grounded, electrical outlet.  
(See Figure A.)  
3. When ready to use the Rotary  
Hammer, squeeze the Power Switch  
(96) and allow the tool to run without  
load for about one minute. This  
allows the tool’s parts to become  
properly lubricated. Check to see  
if the running tool sounds normal.  
Once the tool has been warmed up, it  
is ready for use. (See Figure A.)  
4. When finished using the Rotary  
Hammer, release the Power Switch  
(96). Wait until the tool comes to a  
complete stop. Then unplug the tool  
from its electrical outlet. (See Figure  
A.)  
5. Make sure the Drill Bit is completely  
cooled. Then remove the Bit from  
the tool.  
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only needed beginning after about 50  
hours of use. (See Figure A.)  
MAinTEnAncE And  
SERVicing  
3. TO cHAngE OR clEAn THE  
cARBOn BRuSHES: It may  
become necessary at sometime  
to replace or clean the two  
Procedures not specifically  
explained in this manual  
must be performed only by a  
qualified technician.  
Carbon Brushes (82) when Motor  
performance decreases, or stops  
working completely. The Carbon  
Brushes are located on each side of  
the Motor Housing (78). To change  
or clean the Carbon Brushes:  
TO pREVEnT  
SERiOuS injuRY  
FROM AccidEnTAl  
OpERATiOn:  
Turn the power Switch (96) of  
the Rotary Hammer to its  
“OFF” position and unplug  
the tool from its electrical  
outlet before performing any  
inspection, maintenance, or  
cleaning procedures.  
Remove the two Brush Covers  
(81). Then remove the Carbon  
Brushes.  
If the Carbon Brushes (82) are worn  
down more than 1/2, replace both  
Brushes.  
TO pREVEnT SERiOuS  
injuRY FROM TOOl  
FAiluRE:  
If the Carbon Brushes (82) are  
only dirty, they may be cleaned by  
rubbing them with a pencil eraser.  
do not use damaged  
equipment. if abnormal noise  
or vibration occurs, have the  
problem corrected before  
further use.  
When installing the Carbon Brushes  
(82), make sure the carbon portion  
of the Brushes contact the Motor  
Armature, and that the springs face  
away from the Armature. Also,  
make sure the springs operate  
1. BEFORE EAcH uSE: Inspect  
the general condition of the Rotary  
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.  
freely. After replacing or cleaning,  
replace the two Brush Covers (81).  
NOTE: New Carbon Brushes (82)  
tend to arc or spark when first used  
until they wear and conform to the  
Armature. (See Figure A.)  
4. AFTER uSE: Clean external  
2. AFTER EVERY 50 HOuRS OF uSE:  
Use the Spanner Wrench provided to  
unscrew the Grease Cap (18). Add  
the Grease provided. Then, replace  
and tighten the Grease Cap. nOTE:  
The Rotary Hammer is pre-greased  
from the manufacturer. Lubrication is  
surfaces of the tool with a clean cloth.  
5. WARning! if the power cord  
(112) of this Rotary Hammer is  
damaged, it must be replaced only  
by a qualified service technician.  
SKU 97743  
For technical questions, please call 1-800-444-3353.  
Page 13  
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TROuBlESHOOTing  
problem  
possible causes  
probable Solutions  
Tool will not start.  
1. No power at outlet.  
1. Check power at outlet.  
2. Cord not connected.  
2. Check that cord is plugged in.  
3. Blown fuse or tripped circuit  
breaker.  
3. Replace fuse or reset circuit breaker.  
Motor does not  
rotate with power  
switch depressed.  
1. Disrupted power supply.  
2. Poor contact at the switch.  
3. Armature or field coil burnt.  
4. Broken stator coil.  
1. Check power supply.  
2. Repair switch.  
3. Change coil.  
4. Replace stator coil.  
5. Carbon brushes worn out.  
5. Replace carbon brushes.  
Reduce drilling pressure. Decrease force.  
Abnormal noise  
Overload of motor caused by  
from motor. Does excessive drilling pressure.  
not rotate, or  
rotates slowly.  
Partial short  
circuit.  
Partial short circuit or open circuit Repair or change armature.  
at armature.  
Main voltage too  
low.  
Main power voltage too low.  
Adjust main power voltage.  
Gearbox becomes 1. Overload. Dull bit.  
1. Reduce load. Sharpen bit.  
2. Dry coils.  
too hot.  
2. Damp coils.  
3. Incorrect fitting.  
3. Repair or change armature.  
4. Adjust voltage.  
4. Decrease in voltage.  
Sparking.  
1. Short circuit or break at  
armature.  
1. Repair armature.  
2. Surface of armature not  
smooth and clean.  
2. Inspect and clean armature.  
3. New carbon brushes installed. 3. Normal condition. Sparking will discontinue  
once new carbon brushes are worn flush  
with the armature.  
Follow all safety precautions whenever diagnosing or servicing the  
tool. disconnect power supply before service.  
SKU 97743  
For technical questions, please call 1-800-444-3353.  
Page 14  
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pARTS liST  
part #  
1
description  
O-Ring  
Qty.  
1
3
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
1
1
1
2
1
4
4
1
1
1
part #  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
66  
description  
Washer  
Qty.  
1
1
1
1
1
1
1
2
1
2
2
1
1
1
1
1
1
1
1
2
2
1
1
1
1
1
3
1
1
1
2
1
2
Steel Ball  
Bearing  
3
Cylinder  
Distance Ring  
Distance Cover  
Front Cover  
O-Ring  
4
Feather Key  
Piston  
5
6
O-Ring  
7
Spring Holder  
Spring  
Spring  
8
Steel Column  
Retainer Sleeve  
O-Ring  
9
Clutch  
10  
11  
12  
13  
14  
15  
16  
18  
19  
20  
21  
22  
23  
24  
25  
26  
28  
29  
30  
31  
32  
33  
34  
Third Gear  
O-Ring  
O-Ring  
Piston  
Second Hammer  
Spring  
Connecting Shaft  
Needle Bearing  
O-Ring  
Name Plate  
Oil Seal Ring  
Gear Bearing  
Distance Ring  
Bearing  
O-Ring  
Grease Cap  
Gear Housing  
Name Plate  
Level  
Spacer  
Washer  
Slide Bearing  
Screw  
Slip Plate  
Gear (No. 2)  
Spring Washer  
Special Nut  
Bearing  
Switching Knob  
Position Limit  
Auxiliary  
Handle Seat  
Handle Bracket  
Screw (M5x25)  
Spring  
Crank Shaft  
Steel Ball  
Bearing  
Washer  
Cylinder Case  
Cylinder Cap  
Oil Seal  
Bearing Cover  
Screw (M5x60)  
Gear (No. 1)  
SKU 97743  
For technical questions, please call 1-800-444-3353.  
Page 15  
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pARTS liST (cOnTinuEd)  
part #  
67  
68  
69  
70  
71  
72  
73  
74  
75  
77  
78  
79  
80  
81  
82  
83  
84  
85  
86  
87  
88  
89  
90  
91  
description  
Washer  
Qty.  
1
1
1
1
1
1
1
2
2
1
1
4
4
2
2
2
2
1
2
3
1
1
1
1
part #  
92  
description  
Left Handle Cover  
Insulating Sleeve  
Switch Cover  
Qty.  
1
4
1
1
1
2
1
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
1
Spring  
93  
Clutch Shaft  
Center Cover  
Bearing  
94  
96  
Power Switch  
97  
Cord Pressing Board  
ST Screw (M4x16)  
Board  
Armature  
98  
Fan Guide  
99  
Field Screw  
Washer  
101 Right Handle Cover  
102 ST Screw (M5x25)  
103 Screw (M5x25)  
104 Dust Cover  
Bearing  
Housing  
Washer  
105 Carrying Case  
106 Depth Gauge  
107 Auxiliary Handle  
108 Handle Holder  
109 Handle Shaft  
110 Pressing Board  
111 Four Square Bolt  
112 Power Cord  
Screw (M5x50)  
Brush Cover  
Carbon Brush  
Brush Holder  
Tapping Screw  
Back Cover  
Fixed Screw (M5x6)  
ST Screw (M4x23)  
Needle Bearing  
Spring Holder  
O-Ring  
113 Piston Pin  
114 Slide Bearing  
115 Stator  
116 Steel Ball  
Selector  
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 CERTIfIEDAND 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 PARTS THERETO, OR ARISINg OUT Of HIS OR HER INSTALLATION  
Of REPLACEMENT PARTS THERETO.  
SKU 97743  
For technical questions, please call 1-800-444-3353.  
Page 16  
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ASSEMBlY diAgRAM  
104  
23  
106  
21  
22  
1
24  
2
105  
3
4
25  
111  
5
6
7
110  
19  
26  
28  
29  
30  
31  
109  
18  
8
9
108  
113  
10  
32  
20  
107  
33  
11  
12  
34  
35  
13  
16  
14  
36  
15  
37  
38  
39  
40  
114  
41  
42  
48  
43  
49  
50  
44  
45  
46  
116  
47  
51  
60  
52  
53  
54  
55  
70  
61  
71  
62  
63  
31  
64  
65  
56  
72  
73  
74  
88  
54  
55  
57  
58  
59  
66  
68  
89  
67  
69  
90  
91  
115  
75  
103  
77  
78  
99  
94  
92  
79  
80  
87  
96  
97  
98  
86  
93  
85  
84  
101  
102  
112  
81 82 83  
REV 09e  
SKU 97743  
For technical questions, please call 1-800-444-3353.  
Page 17  
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liMiTEd 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 this product  
is free from defects in materials and workmanship for the period of 90 days from the date  
of purchase. This warranty does not apply to damage due directly or indirectly, to misuse,  
abuse, negligence or accidents, repairs or alterations outside our facilities, criminal activity,  
improper installation, 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 verifies 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 specific 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 • (800) 444-3353  
Record product’s Serial number Here:  
note: If product has no serial number, record month and year of purchase instead.  
note: Some parts are listed and shown for illustration purposes only, and are not  
available individually as replacement parts.  
SKU 97743  
For technical questions, please call 1-800-444-3353.  
Page 18  
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