Central Pneumatic Air Compressor 93785 User Manual
140 PSI TWIN CYLINDER
AIR COMPRESSOR PUMP
FOR 3 HP MOTOR
Model
93785
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© 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.
Manual Revised 09j, 09k
CONTENTS
ASSEMBLY DIAGRAM ................ 18
IMPORTANT SAFETY
INFORMATION ............................ 3
GENERAL SAFETY WARNINGS .......3
COMPRESSOR PUMP SAFETY
WARNINGS ......................................4
AIR COMPRESSOR SAFETY
WARNINGS ......................................5
GROUNDING (FOR MOTOR) ........ 7
SYMBOLOGY .....................................7
SPECIFICATIONS .......................... 8
UNPACKING .................................. 8
INSTRUCTIONS FOR PUTTING
INTO USE .................................... 8
FUNCTIONS ....................................... 8
COMPRESSOR AREA SET UP ......... 8
LIMITED 90 DAY WARRANTY .... 19
INSTALLATION. ................................9
CHECKING THE OIL ........................ 10
GENERAL OPERATING
INSTRUCTIONS ........................ 11
EMERGENCY
DEPRESSURIZATION ...................12
MAINTENANCE AND
SERVICING ............................... 13
CLEANING, MAINTENANCE, AND
LUBRICATION ...............................13
MAINTENANCE SCHEDULE ........... 13
OIL MAINTENANCE ......................... 14
DRAINING MOISTURE FROM THE
TANK .............................................. 14
AIR FILTER MAINTENANCE ........... 14
TROUBLESHOOTING ...................... 15
PARTS LIST ................................. 17
Page 2For technical questions, please call 1-800-444-3353.SKU 93785
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.
not avoided, could result in
minor or moderate injury.
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.
General Safety Warnings
IMPORTANT SAFETY
INFORMATION
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.
CAUTION, used
with the safety
alert symbol, indicates a
hazardous situation which, if
WARNING Read all safety
warnings and instructions.
Failure to follow the warnings and
instructions may result in electric
shock, re and/or serious injury.
Save all warnings and
instructions for future reference.
Work area safety1.
Keep work area clean and well a.
lit. Cluttered or dark areas invite
accidents.
Do not operate the Compressor b.
Pump in explosive atmospheres,
such as in the presence of
ammable liquids, gases or dust.
Compressor motors produce sparks
which may ignite the dust or fumes.
Keep children and bystanders c.
away from an operating
compressor pump.
Personal safety2.
Stay alert, watch what you are a.
doing and use common sense
when operating this compressor
pump. Do not use this compressor
pump while you are tired or under
the inuence of drugs, alcohol or
medication. A moment of inattention
REV 09j
Page 3For technical questions, please call 1-800-444-3353.SKU 93785
while operating a compressor pump
may result in serious personal injury.
Use personal protective b.
equipment. Always wear eye
protection. Safety equipment such
as a dust mask, non-skid safety
shoes, hard hat, or hearing protection
used for appropriate conditions will
reduce personal injuries.
Only use safety equipment c.
that has been approved by an
appropriate standards agency.
Unapproved safety equipment may
not provide adequate protection. Eye
protection must be ANSI-approved
and breathing protection must be
NIOSH-approved for the specic
hazards in the work area.
Compressor Pump use and care3.
Do not use the unit if its power a.
switch does not turn it on and off.
Any tool that cannot be controlled
with its power switch is dangerous
and must be repaired.
Disconnect the plug from the b.
power source before making
any adjustments, changing
accessories, or storing the
compressor pump. Such preventive
safety measures reduce the risk of
starting the unit accidentally.
Store an idle compressor pump c.
out of the reach of children and
do not allow persons unfamiliar
with the compressor pump or
these instructions to operate it. A
compressor pump is dangerous in the
hands of untrained users.
Maintain the compressor pump. d.
Keep the compressor pump clean
for better and safer performance.
Follow instructions for lubricating
and changing accessories. Keep
the outside surfaces dry, clean and
free from oil and grease. Check for
misalignment or binding of moving
parts, breakage of parts and any
other condition that may affect the
compressor pump’s operation. If
damaged, have the compressor
pump repaired before use. Many
accidents are caused by a poorly
maintained compressor pump.
Use the compressor pump e.
in accordance with these
instructions, taking into account
the working conditions and the
work to be performed. Use of the
compressor pump for operations
different from those intended could
result in a hazardous situation.
Service4.
Have your compressor pump a.
serviced by a qualied repair
person using only identical
replacement parts. This will ensure
that the safety of the compressor
pump is maintained.
Compressor Pump
Safety Warnings
Wear ANSI-approved safety goggles 1.
during use.
Install pulley and belt safety guard 2.
before use.
Before rst and every use, verify 3.
Pump has sufcient oil.
The use of accessories or 4.
attachments not recommended by
the manufacturer may result in a risk
of injury to persons.
REV 09j
Page 4For technical questions, please call 1-800-444-3353.SKU 93785
Misalignment between Motor 5.
and Pump can damage the Belt
Wheel. Use a straight edge, such
as a yardstick, to check and adjust
alignment as needed.
Use proper size motor and motor 6.
pulley. This air compressor Pump
must be installed with a 3 HP electric
motor and pulley (both not supplied)
which can turn the Air Compressor
Belt Wheel at approximately 1050
rpm, but not more than 1200 rpm.
Install motor, pulley belt and pulley 7.
belt cover securely. Be sure to use
the proper size bolts to install your
motor (not included). The belt and
belt cover (not included) must be
strong enough to prevent breaking
and possible injury.
Be sure all equipment is rated to 8.
the appropriate capacity of this
pump. Make sure that the lowest
rated piece of equipment you are
using can handle the maximum
pressure of the Air Compressor Pump
(see Specications).
Do not direct the air outlet at any 9.
person or animal.
Use Safety Guard for Pulleys.10. The
Air Compressor Belt Wheel (35),
V-belt (not supplied), and motor
pulley (not supplied) must be covered
by a safety guard (not supplied)
covering all moving elements before
operation.
Avoid burns. 11. The Cylinder (12),
Cylinder Head (5) and Air Outlet (6)
become very hot during operation. Do
not touch.
Air Compressor Safety Warnings
Risk of re or explosion - Do not 1.
spray ammable liquid in a conned
area or towards a hot surface. Spray
area must be well-ventilated. Do not
smoke while spraying or spray where
spark or ame is present. Arcing
parts - Keep compressor at least 20
feet away from explosive vapors,
such as when spraying with a spray
gun.
Risk of bursting - Do not adjust 2.
regulator higher than stated
maximum pressure of attachment.
Risk of injury - Do not direct air 3.
stream at people or animals.
To reduce the risk of electric shock, 4.
do not expose to rain. Store indoors.
Wear ANSI-approved safety goggles 5.
during use.
Do not use to supply breathing air. 6.
Drain Tank daily and after use. 7.
Internal rust causes tank failure and
explosion.
Add correct amount of compressor 8.
oil before rst use and every use.
Operating with low or no oil causes
permanent damage and voids
warranty.
Do not remove the valve cover or 9.
adjust internal components.
Do not use the air hose to move the 10.
compressor.
Release the pressure in the storage 11.
tank before moving.
The use of accessories or 12.
attachments not recommended by
REV 09j
Page 5For technical questions, please call 1-800-444-3353.SKU 93785
the manufacturer may result in a risk
of injury to persons.
All air line components, including 13.
hoses, pipe, connectors, lters, etc.,
must be rated for a minimum working
pressure of 150% of the maximum
system pressure.
USE OF AN EXTENSION CORD 14.
IS NOT RECOMMENDED. If you
choose to use an extension cord, use
the following guidelines:
RECOMMENDED MINIMUM WIRE
GAUGE FOR EXTENSION CORDS
(120 VOLT)
NAMEPLATE
AMPERES
(at full load)
0 – 6 18 16 16 14
6.1 – 10 18 16 Do not use.
10.1 – 12 16 16 Do not use.
12.1 – 16 14 12 Do not use.
EXTENSION CORD
LENGTH
25’ 50’ 100’ 150’
TABLE A
Make sure your extension cord is in a.
good condition.
Be sure to use an extension cord b.
which is heavy enough to carry the
current your product will draw. An
undersized cord will cause a drop in
line voltage resulting in loss of power
and overheating. Table A shows
the correct size to use depending
on cord length and nameplate
ampere rating. If in doubt, use the
next heavier gauge. The smaller the
gauge number, the heavier the cord.
Industrial applications must follow 15.
OSHA guidelines.
Maintain labels and nameplates 16.
on the compressor. These carry
important safety information. If
REV 09j
unreadable or missing, contact
Harbor Freight Tools for a
replacement.
This product is not a toy. Keep it out 17.
of reach of children.
Operate unit on level surface. Check 18.
oil level daily and ll to marked level if
needed.
People with pacemakers should 19.
consult their physician(s) before
use. Electromagnetic elds in close
proximity to heart pacemaker could
cause pacemaker interference or
pacemaker failure.
WARNING: The brass components 20.
of this 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.)
By supplying this air compressor 21.
pump, Harbor Freight Tools makes
no representations and accepts no
responsibility for the motor, V-belt,
enclosure or mounting surface not
supplied by HFT which may be
used in the installation. You are
strongly advised to have this pump
properly installed by a qualied
service technician using appropriate
components in good condition.
The warnings, precautions, 22.
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
Page 6For technical questions, please call 1-800-444-3353.SKU 93785
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