Central Pneumatic 93271 Installation manual

21 GALLON, 230 V~,
CAST IRON VERTICAL
AIR COMPRESSOR
93271
SET UP AND OPERATING INSTRUCTIONS
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©2005 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 08j

SKU 93271 For technical questions, please call 1-800-444-3353. PAGE 2
SPECIFICATIONS
Maximum Air Pressure 115 PSI with Auto Shut-Off
Air Tank Capacity 21 Gallons
Air Flow Capacity 3.5 CFM at 90 PSI
8.8 CFM at 40 PSI
Electrical Requirements 230 V~ / 60 Hz / 7 A / 1 Phase
3 HP rated
Pump Stage Single
Air Outlet Size 1/4” - 18 NPT
Shipping Weight 152 Pounds
Power Cord 10’ - Electrical Plug Sold Separately
SAVE THIS MANUAL
You will need this manual for the safety warnings and precautions, assembly,
operating, inspection, maintenance and cleaning procedures, parts list and assembly
diagram. Keep your invoice with this manual. Write the invoice number on the inside
of the front cover. Keep this manual and invoice in a safe and dry place for future refer-
ence.
GENERAL SAFETY WARNINGS AND PRECAUTIONS
KEEP WORK AREA CLEAN AND DRY.1. Cluttered, damp, or wet work areas invite
injuries.
KEEP CHILDREN AWAY FROM WORK AREA.2. Do not allow children to handle
this product.
STORE IDLE EQUIPMENT.3. When not in use, tools and equipment should be
stored in a dry location to inhibit rust. Always lock up tools and equipment, and
keep out of reach of children.
DO NOT USE THIS PRODUCT IF UNDER THE INFLUENCE OF ALCOHOL OR4. DRUGS. Read warning labels on prescriptions to determine if your judgement or
reexes are impaired while taking drugs. If there is any doubt, do not attempt to
use this product.
USE EYE, HAND, AND HEARING PROTECTION.5. Wear ANSI approved safety
impact goggles, hearing protection, and heavy-duty work gloves when using this
product.
DRESS SAFELY.6. Do not wear loose clothing or jewelry, as they can become
caught in moving parts. Wear a protective hair covering to prevent long hair from
becoming caught in moving parts. If wearing a long-sleeve shirt, roll sleeves up
above elbows.
DO NOT OVERREACH.7. Keep proper footing and balance at all times to prevent
tripping, falling, back injury, etcetera.
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SKU 93271 For technical questions, please call 1-800-444-3353. PAGE 3
INDUSTRIAL APPLICATIONS MUST FOLLOW OSHA REQUIREMENTS.8.
STAY ALERT.9. Watch what you are doing at all times. Use common sense. Do
not use this product when you are tired or distracted from the job at hand.
CHECK FOR DAMAGED PARTS.10. Before using this product, carefully check that
it will operate properly and perform its intended function. Check for damaged parts
and any other conditions that may affect the operation of this product. Replace or
repair damaged or worn parts immediately.
REPLACEMENT PARTS AND ACCESSORIES:11. When servicing, use only identi-
cal replacement parts. Only use accessories intended for use with this product.
Approved accessories are available from Harbor Freight Tools.
MAINTAIN THIS PRODUCT WITH CARE.12. Keep this product clean and dry for
better and safer performance.
MAINTENANCE:13. For your safety, service and maintenance should be performed
regularly by a qualied technician.
USE THE RIGHT TOOL FOR THE JOB.14. Do not attempt to force a small tool or
attachment to do the work of a larger industrial tool. There are certain applications
for which this tool was designed. It will do the job better and more safely at the
rate for which it was intended. Do not modify this tool, and do not use this tool for
a purpose for which it was not intended.
The warnings, precautions, and instructions discussed in this manual cannot cover15. all possible conditions and situations that may occur. The operator must under-
stand that common sense and caution are factors, which cannot be built into this
product, but must be supplied by the operator.
SPECIFIC PRODUCT WARNINGS AND PRECAUTIONS
CAUTION:1. Fill the Air Compressor with a premium quality, 30-weight, non-deter-
gent oil before each use. Running the Air Compressor with no oil or low oil will
cause damage to the equipment.
Note: The oil reservoir has an optimal capacity of 30 ounces of oil.
MAKE SURE ALL TOOLS AND EQUIPMENT USED WITH THE AIR COMPRES-2. SOR ARE RATED TO THE APPROPRIATE CAPACITY. Do not use any tool or
equipment that does not operate at or above the PSI that the compressor’s regula-
tor is set to.
DRAIN AIR COMPRESSOR EVERY DAY.3. Do not allow moisture to build up inside
the Air Compressor. (See “INSPECTION, MAINTENANCE, AND CLEANING”
section of this manual.)
MAINTAIN A SAFE WORKING ENVIRONMENT.4. Keep the work area well lit.
Make sure there is adequate surrounding workspace. Always keep the work area

SKU 93271 For technical questions, please call 1-800-444-3353. PAGE 4
free of obstructions, grease, oil, trash, and other debris. Do not use the Air Com-
pressor in areas near ammable chemicals, dusts, and vapors.
AVOID INJURY:5. Never direct the pressurized air stream at people or animals.
DO NOT ALTER OR REMOVE THE FACTORY SEALED PRESSURE RELEASE6. VALVE (5A). (See Assy. Diagram A.)
DO NOT OPEN THE WATER DRAIN VALVE (10A) SO THAT7. MORE THAN
FOUR THREADS ARE SHOWING. (See Assy. Diagram A.)
AN EXTENSION CORD MUST8. NEVER BE USED WITH THIS ITEM. Connecting
this item to an outlet through an extension cord MAY CAUSE ELECTRICAL
DAMAGE TO THE MOTOR and could present a FIRE HAZARD. Longer air
hoses are typically safer and more effective than extension cords.
THIS UNIT REQUIRES A 230 V~, UL LISTED, TWISTLOCK PLUG (SOLD SEPA-9. RATELY) TO BE INSTALLED BY A QUALIFIED ELECTRICIAN BEFORE SETUP
OR USE.
THIS COMPRESSOR MAY REQUIRE A DEDICATED ELECTRICAL CIRCUIT AS10. THE AMPERAGE DRAW UNDER FULL LOAD COMBINED WITH USE OF ANY
OTHER ITEM MAY OVERLOAD YOUR CIRCUIT.
WARNING:11. This product contains or produces a chemical known to the State of
California to cause cancer and birth defects (or other reproductive harm).
(California Health & Safety Code § 25249.5, et seq.)
People with pacemakers should consult their physician(s) before use. Electromag-12.
netic elds in close proximity to heart pacemaker could cause pacemaker interfer-
ence or pacemaker failure.
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SKU 93271 For technical questions, please call 1-800-444-3353. PAGE 5
UNPACKING
When unpacking, make sure 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 possible.
Find the bag/box that contains all hardware for mounting the parts that are shipped
detached.
ASSEMBLY
Before use, thread the Mufer/Air Filter (7A) assembly into the Cylinder Case (2B).
OPERATION
Note: For additional references to the parts listed below, refer to the Assembly Dia-
grams on pages 10, and 11.
To Check The Oil Level:
FIGURE A
Oil Breather (14B)
Oil Window (20B)
Front Cover (18B)
1. The Oil Window (20B) is used to determine if oil is needed. The oil level should
always be at the maximum level (red line on the Oil Window). (See Figure A, and
Assy. Diagram B.)
Unscrew2. (do not pull) the Oil Breather (14B) out. (See Figure A.)
If necessary, add a3. premium quality, 30-weight, non-detergent oil into the Oil Fill
Hole until the level of oil reaches the maximum level as indicated on the Oil Win-
dow (20B). The optimal capacity of the oil reservoir is 30 ounces. Do not overll.
Then thread the Oil Breather back into the Oil Fill Hole, being careful not to strip
the plastic threads.
REV 08l