Page 1
OFFSET HEAD DUAL CHUCK
TIRE INFLATOR
90670
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© 2003, 2009 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 improvements, 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.
Page 2
SAVE THIS MANUAL
Keep this manual for the safety
warnings and precautions, assembly,
operating, 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.
Safety Alert Symbol and Signal
Words
In this manual, on the labeling,
and all other information
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
follow this symbol to
avoid possible injury
or death.
NOTICE is used to
address practices
not related to personal injury.
CAUTION, without
the safety alert
symbol, is used to address
practices not related to
personal injury.
IMPORTANT SAFETY
INSTRUCTIONS
INSTRUCTIONS PERTAINING
TO A RISK OF FIRE, ELECTRIC
SHOCK, OR INJURY TO
PERSONS
WARNING – When using tools, basic
precautions should always be
followed, including the following:
General
To reduce the risks of electric
shock, re, and injury to persons,
read all the instructions before
using the tool.
DANGER indicates
a hazardous
situation which, if not
avoided, will result in death
or serious injury.
WARNING
indicates a
hazardous situation which, if
not avoided, could result in
death or serious injury.
CAUTION, used
with the safety
alert symbol, indicates a
hazardous situation which, if
not avoided, could result in
minor or moderate injury.
Page 2 For technical questions, please call 1-800-444-3353. SKU 90670
Keep the work area clean and well a.
lighted. Cluttered benches and dark
areas increase the risks of electric
shock, re, and injury to persons.
Keep bystanders, children, and b.
visitors away while operating the
tool. Distractions are able to result in
the loss of control of the tool.
Stay alert. Watch what you are a.
doing and use common sense
when operating the tool. Do not
use the tool while tired or under
the inuence of drugs, alcohol, or
Work area
Personal safety
Page 3
medication. A moment of inattention
while operating the tool increases the
risk of injury to persons.
Avoid unintentional starting. Be b.
sure the Trigger is off before
connecting to the air supply. Do
not carry the tool with your nger on
the Trigger or connect the tool to the
air supply with the Trigger depressed.
Do not overreach. Keep proper c.
footing and balance at all times.
Proper footing and balance
enables better control of the tool in
unexpected situations.
d. Always wear eye
protection. Wear
ANSI-approved safety
goggles.
Tool use and care
Do not force the tool.a. 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.
Do not use the tool if the switch b.
does not turn the tool on or off.
Any tool that cannot be controlled
with the switch is dangerous and
must be repaired.
Disconnect the tool from the c.
air source before making any
adjustments 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.
Store the tool when it is idle out d.
of reach of children and other
untrained persons. A tool is
dangerous in the hands of untrained
users.
Maintain the tool with care. e. A
properly maintained tool reduces
the risk of binding and is easier to
control.
Check for any condition that f.
affects the tool’s operation. If
damaged, 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.
Service
Tool service must be performed a.
only by qualied repair personnel.
When servicing a tool, use only b.
identical replacement parts. Use
only authorized parts.
Use only the lubricants supplied c.
with the tool or specied by the
manufacturer.
Air source
a. Never connect to an air
source that is capable
of exceeding 200 psi.
Over pressurizing the tool
may 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.
Never use oxygen, carbon dioxide, b.
combustible gases or any bottled
gas as an air source for the tool.
Page 3For technical questions, please call 1-800-444-3353.SKU 90670
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Such gases are capable of explosion
and serious injury to persons.
SAVE THESE
INSTRUCTIONS.
SYMBOLS AND SPECIFIC
SAFETY INSTRUCTIONS
Symbol Denitions
Symbol Property or statement
n
PSI
CFM
SCFM
NPT
NPS
No-load speed
o
Pounds per square inch of
pressure
Cubic Feet per Minute ow
Cubic Feet per Minute ow at
standard conditions
National pipe thread, tapered
National pipe thread, straight
WARNING marking
concerning Risk of Eye
Injury. Wear ANSI-approved
eye protection.
WARNING marking
concerning Risk of
Explosion.
Specic Safety Instructions
The warnings and precautions 1.
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.
Obey the manual for the air 2.
compressor used to power this tool.
The brass components of this 3.
product contain lead, a chemical
known to the State of California
to cause birth defects (or other
reproductive harm). (California Health
& Safety code § 25249.5, et seq.)
Install an in-line shutoff valve to allow 4.
immediate control over the air supply
in an emergency, even if a hose is
ruptured.
SAVE THESE
INSTRUCTIONS.
Page 4 For technical questions, please call 1-800-444-3353. SKU 90670
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SPECIFICATIONS
Operating Air Pressure 120 PSI
Measuring Air
Pressure
Air Inlet 1/4” -18 NPT
Pocket Tire Gauge
Components and Controls
10 - 120 PSI in 2 lb.
Increments
6 - 60 PSI in 2 lb.
Increments
INITIAL TOOL SET UP/
ASSEMBLY
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.
Pocket
Tire
Gauge
Tire Chuck
Head
Figure 1
Tire Pressure
Release Pin
Stick
Gauge
Trigger
Tire Chuck (1)
Replaceable Parts
1 Tire Chuck Head
2 Hose
3 O-Ring
Hose (2)
Air Inlet
O-Ring
(3)
Inside
Hose
Air
Release
Button
Unpacking
When unpacking, make sure that
the item is intact and undamaged. If any
parts are missing or broken, please call
Harbor Freight Tools at 1-800-444-3353
as soon as possible.
This air tool may be shipped with •
a protective plug covering the air
inlet. Remove this plug before set
up.
Air Supply
TO PREVENT
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.
Page 5For technical questions, please call 1-800-444-3353.SKU 90670
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Coupler
Plug
Tool
Quick
Coupler
Valve Filter
Quick
Coupler
Recommended Air Line Components
Regulator with
Pressure Gauge
Coupler
Plug
Air Hose
on Reel
Air
Compressor
1. Incorporate a lter, regulator with
pressure gauge, in-line shutoff valve,
and quick coupler for best service,
as shown in the diagram above.
An in-line shutoff ball valve is an
important safety device because it
controls the air supply even if the
air hose is ruptured. The shutoff
valve should be a ball valve
because it can be closed quickly.
Attach an air hose to the 2.
compressor’s air outlet. Connect
the air hose to the air inlet of the Tire
Inator. Other components, such as
a coupler plug and quick coupler, will
make operation more efcient, but
are not required.
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: The air hose must be long enough
to reach the work area with enough
extra length to allow free movement
while working.
Release the Trigger. Close the in-line 3.
safety valve between the compressor
and the tool.
Turn on the air compressor according 4.
to the manufacturer’s directions and
allow it to build up pressure until it
cycles off.
Adjust the air compressor’s output 5.
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.
Inspect the air connections for leaks. 6.
Repair any leaks found.
If the tool will not be used at this 7.
time, turn off and detach the air
supply, safely discharge any residual
air pressure, and release the Trigger
to prevent accidental operation.
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 unpowered.
Note: Air ow, and therefore tool
performance, can be hindered by
undersized air supply components.
Page 6 For technical questions, please call 1-800-444-3353. SKU 90670
Page 7
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.
Inspect tool before use,
looking for damaged, loose,
and missing parts. If any
problems are found, do not
use tool until repaired.
TO PREVENT
SERIOUS INJURY:
Do not adjust or tamper with
any control or component in
a way not specically
explained within this manual.
Improper adjustment can
result in tool failure or other
serious hazards.
Work Piece and Work Area Set Up
Note: Always check/pressurize the tire
when it is cold.
Designate a work area that is clean 1.
and well-lit. The work area must not
allow access by children or pets to
prevent distraction and injury.
Route the air hose along a safe 2.
route to reach the work area
without creating 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.
General Operating Instructions
After connecting the compressor 1.
air hose to the Air Inlet of the Tire
Inator, unthread the valve stem cap
from the tire you wish to inate, then
push the Tire Chuck (1) onto the
valve stem for outside tires, or pull
onto inside tire valve. Make sure that
the Tire Chuck ts snugly onto the
valve stem, holding it in place while
adding or adjusting tire air pressure.
Note: The Stick Gauge will pop up when
the Tire Chuck is on the valve stem
and the Trigger is released, allowing
you to read the tire’s PSI along the
top edge of the gauge cover. It will
retract into the handle when the
Trigger is pressed or when the Tire
Chuck is removed from the valve
stem.
Depress the Trigger to inate. 2.
Continue to depress the Trigger while 3.
holding the Tire Chuck on the valve
stem for a short period of time, then
release the Trigger and read the PSI
on the Stick Gauge.
Repeat Step 4 until the Stick Gauge 4.
indicates that you have reached the
desired PSI.
If the tool requires more force to 5.
accomplish the task, verify that the
tool receives sufcient, unobstructed
airow (CFM) and increase the
pressure (PSI) output of the regulator
up to the maximum air pressure
rating of 120 PSI for this tool.
CAUTION! TO PREVENT TOOL
AND ACCESSORY FAILURE,
RESULTING IN INJURY:
Do not exceed the tool’s maximum
air pressure rating.
If the tool still does not have sufcient
force at maximum pressure and
sufcient airow, then a larger tool
may be required.
Note: If you over-inate the tire, or need
to lower the tire pressure, release the
Page 7For technical questions, please call 1-800-444-3353.SKU 90670
Page 8
Trigger and press the Air Release
button while the Tire Chuck is on the
valve stem. Hold for a short period
of time, then release, and check the
tire air pressure on the Stick Gauge.
Repeat as needed to achieve the
desired value.
When the tire is inated to the proper 6.
PSI, release the Trigger, slide the
Tire Chuck off of the valve stem, and
replace the valve stem cap.
air occurs, have the problem
corrected before further use.
TO PREVENT EXPLOSION:
Lubricate the tool only
with specied lubricants.
Lubricate the air inlet using
only pneumatic tool oil.
Other lubricants may damage
the mechanism and may be
highly ammable, causing an
explosion.
To prevent accidents, turn off the 7.
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
after use. Clean external surfaces of
the tool with a clean, dry cloth. Store
the tool indoors out of children’s
reach.
MAINTENANCE
INSTRUCTIONS
Procedures not specically
explained in this manual
must be performed only by
a qualied 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, and release the
Trigger before performing
any inspection, maintenance,
or cleaning procedures.
Cleaning, Maintenance, and
Lubrication
Every day, perform maintenance
on the air supply according to
the component manufacturers’
instructions. The moisture lter must
be regularly drained. Periodically
apply a drop of multi-purpose
household lubricating oil around
the air valve, below the Trigger.
Performing routine maintenance on
the air supply will allow the tool to
operate more safely and will also
reduce wear on the tool.
TO PREVENT SERIOUS
INJURY FROM TOOL
FAILURE:
Do not use damaged
equipment. If abnormal
noise, vibration, or leaking
Page 8 For technical questions, please call 1-800-444-3353. SKU 90670
Page 9
Troubleshooting
Problem Possible Causes Likely Solutions
Decreased
output.
Not enough air pressure and/1.
or air ow.
Obstructed trigger. 2.
Damaged hose. 3.
Check for loose connections and make sure 1.
that air supply is providing enough air ow
(CFM) at required pressure (PSI) to the
tool’s air inlet. Do not exceed maximum
air pressure.
Clean around trigger to ensure free 2.
movement.
Have repaired or replaced by a qualied 3.
technician.
Failure to
pump air.
Chuck valve stuck. Replace Chuck.
Follow all safety precautions whenever diagnosing or servicing the
tool. Disconnect air supply before service.
PLEASE READ THE FOLLOWING CAREFULLY
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.
Page 9For technical questions, please call 1-800-444-3353.SKU 90670
Page 10
LIMITED 1 YEAR 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 one
year from the date of purchase (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 veries 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 specic 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.
Page 10 For technical questions, please call 1-800-444-3353. SKU 90670
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