Central Pneumatic 94667 User manual

21 GALLON
CAST IRON VERTICAL OIL-LUBRICATED
AIR COMPRESSOR
Model 94667
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©2006 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.
Revised Manual 10d

SKU 94667 For technical questions, please call 1-800-444-3353. PAGE 2
SPECIFICATIONS TABLE
Maximum Air Pressure 115 PSI
Air Tank Capacity 21 Gallons
Air Flow Capacity 4.9 SCFM at 90 PSI
7 SCFM at 40 PSI
Motor 3 HP Working / 5 HP Peak
120 Volt / 60 Hz / 12 A / 1-Phase
Required Circuit Minimum 20 Amp *Dedicated
Pump Stage Single
Air Outlet Size 1/4” - 18 NPT
Accessories Air Intake Filter; Air Hose Coupler
*A dedicated circuit is used only for a single load, for this compressor. Other loads on the circuit must be
disconnected or turned off when the compressor is plugged in.
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. KEEP IDLE EQUIPMENT. When not in use, tools and equipment should be kept
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
reexes are impaired while taking drugs. If there is any doubt, do not attempt to
use this product.
5. USE EYE AND HAND PROTECTION. Wear ANSI-approved safety impact
goggles and heavy-duty work gloves when using this product. ANSI-approved
safety impact eyeglasses and heavy-duty work gloves are available from Harbor
Freight Tools.
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 elbows.
REV 06l; 07c; 09c, 10a
#233060

SKU 94667 For technical questions, please call 1-800-444-3353. PAGE 3
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
identical 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 qualied 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 94667 For technical questions, please call 1-800-444-3353. PAGE 4
SPECIFIC PRODUCT WARNINGS AND PRECAUTIONS
1. WARNING: Make sure to ll the Air Compressor with a premium quality,
30-weight, non-detergent compressor 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. WHEN CHECKING THE OIL LEVEL: Make sure to unscrew (do not pull) the
Breather Valve (14B) out. (See Figure C, and Assy. Diagram B.)
3. MAKE SURE ALL TOOLS AND EQUIPMENT USED WITH THE AIR
COMPRESSOR ARE RATED TO THE APPROPRIATE CAPACITY. Do not use
any tool or equipment that does not operate from 0 to 115 PSI.
4. DO NOT LEAVE COMPRESSOR UNATTENDED FOR AN EXTENDED PERIOD
WHILE PLUGGED IN. Unplug compressor after working.
5. KEEP COMPRESSOR WELL-VENTILATED. Do not cover compressor during
use.
6. 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.)
7. MAINTAIN A SAFE WORKING 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 ammable chemicals, dusts, and vapors.
8. AVOID INJURY: Never direct the Air Flow Valve (6A) at people or animals. (See
Assy. Diagram A.)
9. DO NOT ALTER OR REMOVE THE FACTORY SEALED PRESSURE
RELEASE VALVE (5A). (See Assy. Diagram A.)
10. DO NOT OPEN THE WATER DRAIN VALVE (10A) SO THAT MORE THAN
FOUR THREADS ARE SHOWING. (See Assy. Diagram A.)
11. AN EXTENSION CORD MUST 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.
12. 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.
13. 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.)REV10c

SKU 94667 For technical questions, please call 1-800-444-3353. PAGE 5
TO EXTEND THE LIFE OF YOUR AIR TOOLS AND EQUIPMENT, it is
recommended to install an oiler and water lter in series (available from Harbor
Freight Tools) with the Air Output Line of the Air Compressor.
OPERATING INSTRUCTIONS
NOTE: For additional references to the parts listed below, refer to the Assembly
Diagrams on pages 9, and 10.
To Check The 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 C,
and Assy. Diagram B.)
UNPACKING
When unpacking, check to make sure all the parts shown on the Parts Lists on
pages 9, and 10 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.
IMPORTANT! This compressor is shipped with the oil ll plug removed and without
oil. The oil ll plug is attached to the power cord as a reminder to add oil to the
crankcase. Add oil to the proper level as explained below and secure the oil ll
plug before use.
REV 07i
14. WARNING: People with pacemakers should consult their physician(s) before
using this product. Operation of electrical equipment in close proximity to a heart
pacemaker could cause interference to or failure of the pacemaker.