Harbor Freight Tools 91773 User Manual
2-3/4” X 17-1/2”
AIR INLINE SANDER
Model
91773
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© 2004 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.
Manual Revised 10f
CONTENTS
SAFETY ALERT SYMBOL AND
SIGNAL WORDS .................................. 3
IMPORTANT SAFETY
INSTRUCTIONS ...............................3
GENERAL ................................................ 3
WORK AREA ........................................... 3
PERSONAL SAFETY .............................. 3
TOOL USE AND CARE ........................... 4
SERVICE ................................................. 5
AIR SOURCE ........................................... 5
SYMBOLS AND SPECIFIC
SAFETY INSTRUCTIONS ................5
SYMBOL DEFINITIONS .......................... 5
FUNCTIONAL DESCRIPTION ............8
SPECIFICATIONS ................................... 8
COMPONENTS AND CONTROLS ......... 8
UNPACKING ............................................ 8
AIR SUPPLY ............................................ 8
OPERATING INSTRUCTIONS .........10
TOOL SET UP ....................................... 10
INSTALLING SANDPAPER .................. 10
WORK PIECE AND WORK AREA
SET UP ................................................11
GENERAL OPERATING
INSTRUCTIONS ..................................11
USER-MAINTENANCE
INSTRUCTIONS .............................12
CLEANING, MAINTENANCE, AND
LUBRICATION .................................... 12
TROUBLESHOOTING ........................... 13
PARTS LIST AND ASSEMBLY
DIAGRAM .......................................14
LIMITED 1 YEAR WARRANTY ........15
Page 2 For technical questions, please call 1-800-444-3353. SKU 91773
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.
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
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.
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.
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.
Work area
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.
Do not operate the tool in explosive b.
atmospheres, such as in the presence
of ammable liquids, gases, or dust.
The tool is able to create sparks resulting
in the ignition of the dust or fumes.
REV 10f
CAUTION, used with
the safety alert
symbol, indicates a hazardous
situation which, if not avoided,
could result in minor or moderate
injury.
NOTICE is used to
address practices not
related to personal injury.
Keep bystanders, children, and c.
visitors away while operating the tool.
Distractions are able to result in the loss
of control of the tool.
Personal safety
Stay alert. Watch what you are a.
doing and use common sense when
operating the tool. Do not use the
Page 3For technical questions, please call 1-800-444-3353.SKU 91773
tool while tired or under the inuence
of drugs, alcohol, or medication. A
by hand or against the body is unstable
and is able to lead to loss of control.
moment of inattention while operating
the tool increases the risk of injury to
persons.
Do not force the tool.b. Use the correct
tool for the application. The correct tool
will do the job better and safer at the rate
Dress properly. Do not wear loose b.
for which the tool is designed.
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.
Avoid unintentional starting. Be sure c.
the switch is off before connecting to
the air supply. Do not carry the tool with
your nger on the switch or connect the
tool to the air supply with the switch on.
Do not use the tool if the trigger does c.
not turn the tool on or off. Any tool that
cannot be controlled with the trigger is
dangerous and must be repaired.
Disconnect the tool from the d.
air source before making any
adjustments, 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
Do not overreach. Keep proper d.
footing and balance at all times.
Proper footing and balance enables
better control of the tool in unexpected
discharge any residual air pressure, and
release the throttle and/or turn the switch
to its off position before leaving the work
area.
situations.
Store the tool when it is idle out of e.
e. Use safety equipment. A
dust mask, non-skid safety
shoes and a hard hat must be
reach of children and other untrained
persons. A tool is dangerous in the
hands of untrained users.
used for the applicable
conditions. Wear heavy-duty work
gloves during use.
Maintain the tool with care. f. Keep a
cutting tool sharp and clean. A properly
maintained tool, with sharp cutting edges
f. Always wear eye protection.
Wear ANSI-approved safety
goggles.
g. Always wear hearing
protection when using the
tool. Prolonged exposure to
high intensity noise is able to
cause hearing loss.
reduces the risk of binding and is easier
to control.
Check for misalignment or binding g.
of moving parts, breakage of parts,
and any other condition that 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
Tool use and care
Use clamps or another practical way a.
to secure and support the workpiece
to a stable platform. Holding the work
bursting if the tool is damaged.
Use only accessories that are h.
identied by the manufacturer for
the specic tool model. Use of an
accessory not intended for use with the
Page 4 For technical questions, please call 1-800-444-3353. SKU 91773
REV 10f
specic tool model, increases the risk of
injury to persons.
Service
Tool service must be performed only a.
by qualied repair personnel.
SYMBOLS AND SPECIFIC
SAFETY INSTRUCTIONS
Symbol Denitions
Symbol Property or statement
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.
.../min
PSI
CFM
SCFM
NPT
NPS
Revolutions or reciprocation per minute
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
Hearing Loss. Wear hearing protection.
WARNING marking concerning Risk
of Respiratory Injury. Wear NIOSH-
approved dust mask/respirator.
WARNING marking concerning Risk of
Explosion.
Never use oxygen, carbon dioxide, b.
combustible gases or any bottled gas
as an air source for the tool. Such
gases are capable of explosion and
serious injury to persons.
SAVE THESE
INSTRUCTIONS.
REV 10f
Specic Safety Instructions
Read and understand this instruction 1.
manual before product use.
Wear ANSI-approved hearing and eye 2.
protection during use. Wear safety
goggles and heavy duty work gloves
during attachment and removal of
sandpaper.
Clamp workpiece securely before 3.
sanding.
Use this tool with both hands only. Using 4.
tools with only one hand can result in
loss of control.
Page 5For technical questions, please call 1-800-444-3353.SKU 91773
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