Central Pneumatic 93271 User manual

®
21 GALLON, 230 VAC,
CAST IRON VERTICAL
AIR COMPRESSOR
OPERATING INSTRUCTIONS
®
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit ourWeb site at http://www.harborfreight.com
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.
For technical questions, please call 1-800-444-3353.
93271

SKU 93271 For technical questions, please call 1-800-444-3353. PAGE 2
SPECIFICATIONS
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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 reference.
GENERAL SAFETY WARNINGS AND PRECAUTIONS
1. KEEP WORK AREA CLEAN AND DRY. Cluttered, damp, or wet work areas invite
injuries.
2. KEEP CHILDREN AWAY FROM WORK AREA. Do not allow children to handle
this product.
3. STORE IDLE EQUIPMENT. 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.
4. DO NOT USE THIS PRODUCT IF UNDER THE INFLUENCE OF ALCOHOL OR
DRUGS. Read warning labels on prescriptions to determine if your judgement or
reflexes are impaired while taking drugs. If there is any doubt, do not attempt to
use this product.
5. USE EYE, HAND, AND HEARING PROTECTION. Wear ANSI approved safety
impact goggles, hearing protection, and heavy-duty work gloves when using this
product.
REV 10/05

SKU 93271 For technical questions, please call 1-800-444-3353. PAGE 3
6. DRESS SAFELY. 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 el-
bows.
7. DO NOT OVERREACH. Keep proper footing and balance at all times to prevent
tripping, falling, back injury, etcetera.
8. INDUSTRIAL APPLICATIONS MUST FOLLOW OSHA REQUIREMENTS.
9. STAY ALERT. 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.
10. CHECK FOR DAMAGED PARTS. 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.
11. REPLACEMENT PARTS AND ACCESSORIES: 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.
12. MAINTAIN THIS PRODUCT WITH CARE. Keep this product clean and dry for
better and safer performance.
13. MAINTENANCE: For your safety, service and maintenance should be performed
regularly by a qualified technician.
14. USE THE RIGHT TOOL FOR THE JOB. 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.
15. WARNING: The warnings, precautions, and instructions discussed in this manual
cannot cover all possible conditions and situations that may occur. The operator
must understand that common sense and caution are factors, which cannot be built
into this product, but must be supplied by the operator.

SKU 93271 For technical questions, please call 1-800-444-3353. PAGE 4
SPECIFIC PRODUCT WARNINGS AND PRECAUTIONS
1. CAUTION: Make sure to fill the Air Compressor with a premium quality, 30-weight,
non-detergent 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.
2. MAKE SURE ALL TOOLS AND EQUIPMENT USED WITH THE AIR COMPRES-
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 regulator
is set to.
3. DRAIN AIR COMPRESSOR EVERY DAY. Do not allow moisture to build up inside
the Air Compressor. (See
“INSPECTION, MAINTENANCE, AND CLEANING”
section of this manual.)
4. MAINTAIN A SAFEWORKING ENVIRONMENT. Keep the work area well lit. Make
sure there is adequate surrounding workspace. Always keep the work area free of
obstructions, grease, oil, trash, and other debris. Do not use the Air Compressor in
areas near flammable chemicals, dusts, and vapors.
5. AVOID INJURY: Never direct the pressurized air stream at people or animals.
6. DO NOT ALTER OR REMOVE THE FACTORY SEALED PRESSURE RELEASE
VALVE (5A). (See Assy. Diagram A.)
7. DO NOT OPEN THE WATER DRAIN VALVE (10A) SOTHAT MORE THAN FOUR
THREADS ARE SHOWING. (See Assy. Diagram A.)
8. AN EXTENSION CORD MUST NEVER BE USEDWITHTHIS ITEM. Connecting
this item to an outlet through an extension cord MAY CAUSE ELECTRICAL
DAMAGETO THE MOTOR and could present a FIRE HAZARD. Longer air hoses
are typically safer and more effective than extension cords.
9. THIS UNIT REQUIRES A 230 VAC, UL LISTED, TWISTLOCK PLUG TO BE
INSTALLED BY A LICENSED TECHNICIAN BEFORE SETUP OR USE.
10. THIS COMPRESSOR MAY REQUIRE A DEDICATED ELECTRICAL CIRCUIT
AS THE AMPERAGE DRAW UNDER FULL LOAD COMBINED WITH USE OF
ANY OTHER ITEM MAY OVERLOAD YOUR CIRCUIT.
11. WARNING: 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. )
12. People with pacemakers should consult their physician(s) before using this prod-
uct. Operation of electrical equipment in close proximity to a heart pacemaker could
cause interference to or failure of the pacemaker.

SKU 93271 For technical questions, please call 1-800-444-3353. PAGE 5
UNPACKING
When unpacking, check to make sure all the parts shown on the Parts Lists on pages 10,
and 11 are included. 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.
OPERATING INSTRUCTIONS
NOTE: For additional references to the parts listed below, refer to the Assembly
Diagrams on pages 10, and 11.
To CheckThe Oil Level:
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.)
2. WHEN OPENING THE DIP STICK: Make sure to unscrew(do not pull) the Dip
Stick (14B) out. (See Figure A.)
3. If necessary, add a
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 Window
(20B). The optimal capacity of the oil reservoir is 30 ounces. Do not overfill. Then
thread the Dip Stick back into the Oil Fill Hole, being careful not to strip the plastic
threads.
FIGURE A
Dip Stick (14B)
OilWindow (20B)
Front Cover (18B)
To Turn The Air Compressor On:
1. Check to make sure the Water Drain Valve (10A) is fully closed.
(See Assy. Diagram A.)