AIR MICRO DIE GRINDER
Model 97870
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
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.
For technical questions or replacement parts, please call 1-800-444-3353.
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NOTICE is used to
address practices
not related to personal injury.
SAVE THIS MANUAL
Keep this manual for the safety warn-
ings and precautions, assembly, operat-
ing, inspection, maintenance and cleaning
procedures. Write the product’s serial
number in the back of the manual near the
assembly diagram (or month and year of
purchase if product has no number). Keep
this manual and the receipt in a safe and
dry place for future reference.
CAUTION, without
the safety alert
symbol, is used to address
practices not related to
personal injury.
IMPORTANT SAFETY
INSTRUCTIONS
Safety Alert Symbol and Signal
Words
INSTRUCTIONS PERTAINING
TO A RISK OF FIRE,
In this manual, on the labeling,
and all other information
ELECTRIC SHOCK, OR
INJURY TO PERSONS
provided with this product:
This is the safety alert
symbol. It is used to alert
you to potential personal
injury hazards. Obey all
safety messages that
WARNING – When using tools, basic pre-
cautions should always be followed,
including the following:
follow this symbol to avoid
possible injury or death.
General
a. To reduce the risks of electric
shock, fire, and injury to persons,
read all the instructions before us-
ing the tool.
DANGER indicates
a hazardous
situation which, if not
avoided, will result in death or
serious injury.
Work area
a. Keep the work area clean and well
lighted. Cluttered benches and dark
areas increase the risks of electric
shock, fire, and injury to persons.
WARNING
indicates a
hazardous situation which, if
not avoided, could result in
death or serious injury.
b. Do not operate the tool in explo-
sive atmospheres, such as in the
presence of flammable liquids,
gases, or dust. The tool is able to
create sparks resulting in the ignition
of the dust or fumes.
CAUTION, used
with the safety
alert symbol, indicates a
hazardous situation which, if
not avoided, could result in
minor or moderate injury.
c. Keep bystanders, children, and
visitors away while operating the
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tool. Distractions are able to result in
the loss of control of the tool.
conditions. Wear heavy-duty work
gloves during use.
g.
h.
Always wear eye protec-
tion. Wear ANSI-ap-
proved safety goggles.
Personal safety
a. Stay alert. Watch what you are do-
ing and use common sense when
operating the tool. Do not use the
tool while tired or under the influ-
ence of drugs, alcohol, or medica-
tion. A moment of inattention while
operating the tool increases the risk
of injury to persons.
Always wear hearing
protection when using
the tool. Prolonged expo-
sure to high intensity noise
is able to cause hearing loss.
i.
Keep this product and all other tools
away from children and animals. Do
not allow spectators in or around the
work area.
b. Dress properly. Do not wear loose
clothing or jewelry. Contain long
hair. Keep hair, clothing, and
gloves away from moving parts.
Loose clothes, jewelry, or long hair
increases the risk of injury to persons
as a result of being caught in moving
parts.
j.
Never submerge this tool in liquids or
use while in an excessively moist, or
volatile environment.
k. Ensure the bit, Collet Nut and work
piece are tightly secured before each
use.
c. Avoid unintentional starting. Be
sure the switch is off before con-
necting to the air supply. Do not
carry the tool with your finger on the
valve or connect the tool to the air
supply with the valve on.
l.
Use only included and/or recom-
mended parts & accessories with this
tool. Never use a carbide tipped or
steel circular saw blade with this Die
Grinder. Do not use a wood carving
blade, carving disc with chain saw
cutters, or a cutting carving disc with
this Die Grinder.
d. Remove adjusting keys and
wrenches before turning the tool
on. A wrench or a key that is left at-
tached to a rotating part of the tool
increases the risk of personal injury.
m. Never exceed the maximum rated
air pressure for this tool. Also never
attempt to use a propellant other than
what has been recommended/speci-
fied.
e. Do not overreach. Keep proper
footing and balance at all times.
Proper footing and balance enables
better control of the tool in unexpect-
ed situations.
n. Use for intended purposes only.
Never force or modify a tool to per-
form a task for which it was not con-
structed.
f.
Use safety equipment. A
dust mask, non-skid safety
shoes and a hard hat must
be used for the applicable
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affects the tool’s operation. If dam-
aged, have the tool serviced before
using. Many accidents are caused
by poorly maintained tools. There is a
risk of bursting if the tool is damaged.
Tool use and care
a. Use clamps or another practical
way to secure and support the
workpiece to a stable platform.
Holding the work by hand or against
the body is unstable and is able to
lead to loss of control.
h. Use only accessories that are
identified by the manufacturer for
the specific tool model. Use of an
accessory not intended for use with
the specific tool model, increases the
risk of injury to persons. Wheels and
other accessories running over rated
speed can fly apart and result in a
risk of injury to persons.
b. Do not force the tool. Use the
correct tool for the application. The
correct tool will do the job better and
safer at the rate for which the tool is
designed.
c. Do not use the tool if the valve
does not turn the tool on or off.
Any tool that cannot be controlled
with the switch is dangerous and
must be repaired.
Service
a. Tool service must be performed
only by qualified repair personnel.
d. Disconnect the tool from the air
source before making any adjust-
ments, changing accessories, or
storing the tool. Such preventive
safety measures reduce the risk of
starting the tool unintentionally. Turn
off and detach the air supply, safely
discharge any residual air pressure,
and release the throttle and/or turn
the switch to its off position before
leaving the work area.
b. When servicing a tool, use only
identical replacement parts. Use
only authorized parts.
c. Use only the lubricants supplied
with the tool or specified by the
manufacturer.
Air source
a.
Never connect to an air
source that is capable of
exceeding 90 psi. Over
pressurizing the tool may
e. Store the tool, when it is idle, out
of reach of children and other un-
trained persons. A tool is dangerous
in the hands of untrained users.
cause bursting, abnormal operation,
breakage of the tool or serious injury
to persons. Use only clean, dry,
regulated compressed air at the rated
pressure or within the rated pressure
range as marked on the tool. Always
verify prior to using the tool that the
air source has been adjusted to the
rated air pressure or within the rated
air-pressure range.
f.
Maintain the tool with care. Keep a
cutting tool sharp and clean. A prop-
erly maintained tool, with sharp cut-
ting edges reduces the risk of binding
and is easier to control.
g. Check for misalignment or bind-
ing of moving parts, breakage of
parts, and any other condition that
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b. Never use oxygen, carbon dioxide,
combustible gases or any bottled
gas as an air source for the tool.
Such gases are capable of explosion
and serious injury to persons.
Symbol Definitions
Symbol
Property or statement
WARNING marking concerning Risk
of Explosion.
SAVE THESE
INSTRUCTIONS.
Specific Safety Instructions
1. The warnings and precautions dis-
cussed in this manual cannot cover
all possible conditions and situations
that may occur. It must be under-
stood by the operator that common
sense and caution are factors which
cannot be built into this product, but
must be supplied by the operator.
SYMBOLS AND
SPECIFIC SAFETY
INSTRUCTIONS
Symbol Definitions
WARNING – Some dust created by
power sanding, sawing, grinding, drill-
ing, 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:
• Lead from lead-based paints
• Crystalline silica from bricks and
cement or other masonry products
• Arsenic and chromium from chemi-
cally treated lumber
Your risk from these exposures var-
ies, 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.)
Symbol
Property or statement
No-load speed
n
o
Revolutions or reciprocation per
minute
.../min
PSI
Pounds per square inch of pressure
Foot-pounds of torque
ft-lb
Blows per minute
BPM
CFM
SCFM
NPT
Cubic Feet per Minute flow
Cubic Feet per Minute flow at
standard conditions
National pipe thread, tapered
National pipe thread, straight
NPS
WARNING marking concerning Risk
of Eye Injury. Wear ANSI-approved
eye protection.
WARNING marking concerning Risk
of Hearing Loss. Wear hearing
protection.
WARNING – The brass components
of this product contain lead, a chemi-
cal known to the State of California
to cause birth defects (or other repro-
WARNING marking concerning Risk
of Respiratory Injury. Wear NIOSH-
approved dust mask/respirator.
Chart continued in next column.
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ductive harm). (California Health &
Safety code § 25249.5, et seq.)
this tool. If you feel any medical or
physical symptoms related to vibra-
tion (such as tingling, numbness, and
white or blue fingers), seek medical
advice as soon as possible.
2. Only use with accessories rated to
handle the forces exerted by this
tool during operation. Accessories
not designed for the forces gener-
ated may break and forcefully launch
pieces.
2. Do not smoke during use. Nico-
tine reduces the blood supply to the
hands and fingers, increasing the risk
of vibration-related injury.
3. Attach all accessories properly to the
tool before connecting the air sup-
ply. A loose accessory may detach or
break during operation.
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 dif-
ferent processes.
4. Obey the manual for the air compres-
sor used to power this tool.
5. Install an in-line shutoff valve to allow 5. Include vibration-free periods each
immediate control over the air supply
in an emergency, even if a hose is
ruptured.
day of work.
6. Grip tool as lightly as possible (while
still keeping safe control of it). Let
the tool do the work.
6. 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.
7. To reduce vibration, maintain tool as
explained in this manual. If abnormal
vibration occurs, stop immediately.
Vibration Precautions
SAVE THESE
INSTRUCTIONS.
This tool vibrates during use. Re-
peated or long-term exposure to vibra-
tion may cause temporary or permanent
physical injury, particularly to the hands,
arms and shoulders. To reduce the risk of
vibration-related injury:
1. Anyone using vibrating tools regu-
larly 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, ner-
vous system disorders, diabetes, or
Raynaud’s Disease should not use
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Air Supply
FUNCTIONAL DESCRIPTION
TO PREVENT
Specifications
EXPLOSION:
Use only clean, dry, regulated,
compressed air to power this
tool. Do not use oxygen,
carbon dioxide, combustible
gases, or any other bottled
gas as a power source for this
tool.
Exhaust Position
On/Off Method
Frontal Exhaust
Built-in Rotary Valve
1/4" -18 NPT (male inlet
coupler)
Air Inlet
Maximum Speed*
Air Consumption
Collet Size
25,000 RPM
2 CFM @ 90 PSI
1/8"
* Maximum speed at stated maximum air pressure. Ex-
cess air pressure is hazardous and may cause the tool
to exceed stated maximum speed.
Male
Connector
Male
Connector
Tool
Quick
Coupler
INITIAL TOOL SET UP/
ASSEMBLY
Air Hose
on Reel
Read the ENTIRE IMPORTANT
SAFETY INFORMATION
Valve
Filter
Oiler
section at the beginning of this
manual including all text under
subheadings therein before set
up or use of this product.
Air
Compressor
Quick
Coupler
Regulator with
Pressure Gauge
Note: For additional information regarding
the parts listed in the following pages,
refer to the Assembly Diagram near
the end of this manual.
Recommended Air Line Components
1. Incorporate an in-line oiler, shut-off
valve, regulator with pressure gauge,
and filter for best service, as shown in
the diagram above. An in-line shut-
off valve is an important safety
device because it controls the air
supply even if the air hose is rup-
tured.
Unpacking
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 throughout the manual as soon as
possible.
Note: If an automatic oiler system is not
used, add a few drops of Pneumatic
Tool Oil to the airline connection be-
fore operation. Add a few more drops
after each hour of continual use.
• This air tool may be shipped with a
protective plug covering the air inlet.
Remove this plug before set up.
2. Attach an air hose to the compres-
sor’s air outlet. Connect the air hose
to the air inlet of the tool. Other com-
REV 08j
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ponents, such as a connector and
quick coupler, will make operation
more efficient, but are not required.
9. If the tool will not be used at this
time, turn off and detach the air sup-
ply, safely discharge any residual air
pressure, and release the throttle
and/or turn the switch to its off posi-
tion to prevent accidental operation.
WARNING! TO PREVENT SERIOUS
INJURY FROM ACCIDENTAL
OPERATION:
Do not install a female quick
coupler on the tool. Such a coupler
contains an air valve that will allow
the air tool to retain pressure and
operate accidentally after the air
supply is disconnected.
Note: Residual air pressure should not be
present after the tool is disconnected
from the air supply. However, it is a
good safety measure to attempt to
discharge the tool in a safe fashion
after disconnecting to ensure that the
tool is disconnected and un-powered.
Note: Air flow, and therefore tool perfor-
mance, can be hindered by under-
sized air supply components.
3. The air hose must be long enough
to reach the work area with enough
extra length to allow free movement
while working.
4. Make sure the tool’s throttle or switch
is in the off position; refer to Opera-
tion section for description of con-
trols.
5. Close the in-line safety valve be-
tween the compressor and the tool.
6. Turn on the air compressor according
to the manufacturer’s directions and
allow it to build up pressure until it
cycles off.
7. Adjust the air compressor’s output
regulator so that the air output is
enough to properly power the tool,
but the output will not exceed the
tool’s maximum air pressure at any
time. Adjust the pressure gradually,
while checking the air output gauge
to set the right pressure range.
8. Inspect the air connections for leaks.
Repair any leaks found.
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2. Tighten finger tight, then use the two
Collet Nut Wrenches, one on the top
of the Clamping Nut, and the other on
the Collet Holder (18) and tighten the
tip securely.
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.
Work Piece and Work Area Set Up
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.
Inspect tool before use, looking
for damaged, loose, and
missing parts. If any problems
are found, do not use tool until
repaired.
2. Route the air hose along a safe route
to reach the work area without creat-
ing a tripping hazard or exposing the
air hose to possible damage. The air
hose must be long enough to reach
the work area with enough extra
length to allow free movement while
working.
Tool Set Up
TO PREVENT
SERIOUS INJURY
FROM ACCIDENTAL
OPERATION:
Turn off the tool, detach the
air supply, safely discharge
any residual air pressure in
the tool, and release the
throttle and/or turn the switch
to its off position before
performing any inspection,
maintenance, or cleaning
procedures.
3. Secure loose workpieces using a vise
or clamps (not included) to prevent
movement while working.
4. There must not be hazardous ob-
jects (such as utility lines or foreign
objects) nearby that will present a
hazard while working.
General Operating Instructions
TO PREVENT SERIOUS
INJURY:
1. If an automatic oiler is not used, add
a few drops of Pneumatic Tool Oil to
the air-line connection before use.
Add a few more drops after each
hour of continual use.
Do not adjust or tamper with
any control or component in a
way not specifically explained
within this manual. Improper
adjustment can result in
tool failure or other serious
hazards.
2. Have the desired bit installed in the
end of the grinder and secured.
1. To install a bit (with 1/8” shank),
loosen the Clamping Nut (22), slide
the bit’s shank through the Clamping
Nut and through the 1/8” Collet (21).
3. Wear ANSI-approved safety glasses.
4. Ensure that the Control Ring (3) is
in the “OFF” position. Plug the Male
Coupler Plug to an air compressor.
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5. Turn the Control Ring (3) slowly to
the “ON” position to begin grinding or
cutting. The more you turn the knob,
the higher the RPM.
6. If the tool requires more force to
accomplish the task, verify that the
tool receives sufficient, unobstructed
airflow (CFM) and increase the pres-
sure (PSI) output of the regulator up
to the maximum air pressure rating of
this tool.
CAUTION! TO PREVENT TOOL
AND ACCESSORY FAILURE, RE-
SULTING IN INJURY:
Do not exceed the tool’s maximum
air pressure rating.
If the tool still does not have sufficient
force at maximum air pressure and
sufficient airflow, then a larger tool
may be required.
7. To prevent accidents, turn off the
tool, detach the air supply, safely
discharge any residual air pressure
in the tool. Clean external surfaces
of the tool with clean, dry cloth, and
apply a thin coat of tool oil. Then
store the tool indoors out of children’s
reach.
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explained as part of the regular op-
eration of the air-operated tool.
USER-MAINTENANCE
INSTRUCTIONS
1. Daily - Air Supply Maintenance:
Every day, perform maintenance on
the air supply according to the com-
ponent manufacturers’ instructions.
Maintenance on the air supply will
allow the tool to operate more safely
and will also reduce wear on the tool.
Any disassembly and cleaning should
be done only by a qualified techni-
cian.
Procedures not specifically
explained in this manual
must be performed only by a
qualified technician.
TO PREVENT
SERIOUS INJURY
FROM ACCIDENTAL
OPERATION:
Turn off the tool, detach the
air supply, safely discharge
any residual air pressure in
the tool before performing any
inspection, maintenance, or
cleaning procedures.
2. Wipe and brush grinder off after each
use. keep the unit dry and keep the
space at either end of the knob free
of oil, grease and wood or metal
chips.
TO PREVENT SERIOUS
INJURY FROM TOOL
FAILURE:
3. Ensure that the Front Cover (20),
Sleeve (19) and Rear End Holder
are tightly secured so that air will not
escape.
Do not use damaged
equipment. If abnormal
noise, vibration, or air leaking
occurs, have the problem
corrected before further use.
4. Ensure the hose couplings or con-
nectors have air tight connections.
TO PREVENT EXPLOSION:
Lubricate the tool only
with specified lubricants.
Lubricate the air inlet
using only pneumatic tool
oil. Lubricate the internal
mechanism using only
white lithium grease. Other
lubricants may damage the
mechanism and may be
highly flammable, causing an
explosion.
Cleaning and Maintenance
Note: These procedures are in addition to
the regular checks and maintenance
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Troubleshooting
Problem
Possible Causes
Likely Solutions
Decreased output. 1. Not enough air pressure and/ 1. Check for loose connections and make sure
or air flow.
that air supply is providing enough air flow
(CFM) at required pressure (PSI) to the
tool’s air inlet. Do not exceed maximum air
pressure.
2. Obstructed valve.
2. Clean around valve to ensure free
movement.
3. Incorrect lubrication
inadequately lubricated.
3. Lubricate using air tool oil and grease
according to directions.
4. Blocked air inlet screen (if
equipped).
4. Clean air inlet screen of buildup.
5. Air leaking from loose housing. 5. Make sure housing is properly assembled
and tight.
6. Mechanism contaminated.
6. Have qualified service technician clean and
lubricate mechanism. Install in-line filter in air
supply as stated in Initial Set Up: Air Supply.
7. Rotor blade wear or damage. 7. Replace all rotor blades as a set.
Housing heats
during use.
1. Incorrect lubrication or not
enough lubrication.
1. Lubricate using air tool oil and grease
according to directions.
2. Worn parts.
2. Have qualified service technician inspect
internal mechanism and replace parts as
needed.
Severe air
leakage.
(Slight air leakage
is normal,
especially on older
tools.)
1. Cross-threaded housing
components.
1. Check for incorrect alignment and uneven
gaps. If cross-threaded, disassemble and
replace damaged parts before assembly.
2. Loose housing.
2. Tighten housing assembly. If housing cannot
be tightened properly, internal parts may be
misaligned.
3. Damaged valve or housing.
3. Replace damaged components.
4. Dirty, worn or damaged Control 4. Clean or replace Control Ring assembly.
Ring (3).
Follow all safety precautions whenever diagnosing or servicing the tool.
Disconnect air supply before service.
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ACCESSORY LIST
Part
Description
Function
Tighten/loosen
Clamping Nut
(22) and Collet
Holder (18) for bit
installation and
removal.
23
Collet Nut Wrenches
Plug into pressure
source.
24
Male Coupler Plug
*SKU or part number may not be available for some
accessories.
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 PARTS THERETO, OR ARISING
OUT OF HIS OR HER INSTALLATION OF
REPLACEMENT PARTS THERETO.
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PARTS LIST
PARTS LIST
Part
Description
Q’ty
Part
Description
Q’ty
1
2
3
4
5
6
7
8
9
Rear End Holder
Screw
1
1
1
2
1
1
1
1
1
1
1
1
13 Rotor Blade
Set
1
14 Cylinder
15 Spacer
16 Lateral Disc
17 Ball Bearing
18 Collet Holder
19 Sleeve
20 Front Cover
Control Ring
O-ring
1
1
1
1
1
1
1
1
O-ring
Pin
Hose Plug
Intake Plate
Ball Bearing
21 Collet, 1/8"
10 Pin
11 Bearing Plate
12 Rotor
22 Clamping Nut
23 Collet Nut Wrenches (not shown)
24 Male Coupler Plug (not shown)
2
1
ASSEMBLY DIAGRAM
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 avail-
able individually as replacement parts.
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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.
SKU 97870
For technical questions, please call 1-800-444-3353.
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