Central Pneumatic 93351 User manual

2.5 HP AIR COMPRESSOR
29 GALLON CAPACITY
Model 93351
ASSEMBLY AND OPERATING INSTRUCTIONS
3491 Mission Oaks Blvd., Camarillo, CA 93011
Visit our Web 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.
Cover Revised 05/06
®
TO PREVENT SERIOUS INJURY,
READ AND UNDERSTAND ALL WARNINGS
AND INSTRUCTIONS BEFORE USE.
Do to continuing improvements,
actual product may differ slightly
from the product described herein.
WARNING!
Your Warranty Is Voided If:
A. You do not put compressor oil in the Compressor’s crankcase prior to its first use.
Before each use, check the oil level. Never run the Compressor with low or no compres-
sor oil. Running the Compressor with low or no oil will permanently damage the unit.
B. You use an extension cord with the Air Compressor.
Connect the Air Compressor’s Power Cord Plug directly to the nearest 120 volt, grounded,
electrical outlet. If necessary, attach a longer air hose to the Compressor.
C. You drop the Air Compressor.
Do not lift the Air Compressor using its Handle.

SKU 93351 For technical questions, please call 1-800-444-3353. Page 2
PRODUCT SPECIFICATIONS
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 RULES
WARNING!
READ AND UNDERSTAND ALL INSTRUCTIONS
Failure to follow all instructions listed below may result in
electric shock, fire, and/or serious injury.
SAVE THESE INSTRUCTIONS
WORK AREA
Keep your work area clean and well lit. Cluttered benches and dark areas invite
accidents.
Do not operate power tools in explosive atmospheres, such as in the
presence of flammable liquids, gases, or dust. Power tools create sparks
which may ignite the dust or fumes.
Keep bystanders, children, and visitors away while operating a power tool
Distractions can cause you to lose control. Protect others in the work area from
debris such as chips and sparks. Provide barriers or shields as needed.
1.
2.
3.
Electrical Requirements 120V / 60 Hz / Single Phase / 13.5 Amps (With Load)
2.5 HP / Single Phase / 3450 RPM
3-Wire Power Cord (6’ Long x 16 Gauge x 3 Cords)
3-Prong Power Cord Plug
Air Tank Capacity 29 Gallons
Pump Stage Single Stage (Direct Drive)
Pump Style Single Cylinder Pump
Maximum Air Pressure 110 PSI w/Automatic Shut Off
Auto Start PSI Starts at 85 PSI
Regulators w/Gauges Reads 0-200 PSI (in 10 PSI Increments)
Air Flow Capacity 8.5 CFM @ 40 PSI / 7.5 CFM @ 90 PSI
Air Outlet Size ¼”-18 NPT
Accessories Air Filter (Qty. 1)
Tool Weight 154 Pounds

SKU 93351 For technical questions, please call 1-800-444-3353. Page 3
ELECTRICAL SAFETY
Grounded tools must be plugged into an outlet properly installed and
grounded in accordance with all codes and ordinances. Never remove
the grounding prong or modify the plug in any way. Do not use any
adapter plugs. Check with a qualified electrician if you are in doubt as to
whether the outlet is properly grounded. If the tools should electrically malfunc-
tion or break down, grounding provides a low resistance path to carry electricity
away from the user.
5. Double insulated tools are equipped with a polarized plug (one blade is wider
than the other). This plug will fit in a polarized outlet only one way. If the plug
does not fit fully in the outlet, reverse the plug. If it still does not fit, contact
a qualified electrician to install a polarized outlet. Do not change the plug
in any way. Double insulation eliminates the need for the three wire grounded
power cord and grounded power supply system.
6. Avoid body contact with grounded surfaces such as pipes, radiators, ranges,
and refrigerators. There is an increased risk of electric shock if your body is
grounded.
7. Do not expose power tools to rain or wet conditions. Water entering a power
tool will increase the risk of electric shock.
8. Do not abuse the Power Cord. Never use the Power Cord to carry the tools or
pull the Plug from an outlet. Keep the Power Cord away from heat, oil, sharp
edges, or moving parts. Replace damaged Power Cords immediately. Dam-
aged Power Cords increase the risk of electric shock.
PERSONAL SAFETY
Stay alert. Watch what you are doing, and use common sense when operat-
ing a power tool. Do not use a power tool while tired or under the influence
of drugs, alcohol, or medication. A moment of inattention while operating power
tools may result in serious personal injury.
Dress properly. Do not wear loose clothing or jewelry. Contain long hair.
Keep your hair, clothing, and gloves away from moving parts. Loose clothes,
jewelry, or long hair can be caught in moving parts.
Avoid accidental starting. Be sure the ON/OFF Knob (86) is off before plug-
ging in. Plugging in power tools with the ON/OFF Knob on, invites accidents.
Remove adjusting keys or wrenches before turning the power tool on. A wrench or
a key that is left attached to a rotating part of the power tool may result in personal
injury.
1.
9.
10.
11.
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SKU 93351 For technical questions, please call 1-800-444-3353. Page 4
Do not overreach. Keep proper footing and balance at all times. Proper footing
and balance enables better control of the power tool in unexpected situations.
Use safety equipment. Always wear eye protection. Always wear
ANSI approved safety impact goggles when using this product. Hearing
protection must be used for appropriate conditions.
TOOL USE AND CARE
Use clamps (not included) or other practical ways to secure and support
the workpiece to a stable platform. Holding the work by hand or against your
body is unstable and may lead to loss of control.
Do not force the tool. Use the correct tool for your application. The correct
tool will do the job better and safer at the rate for which it is designed.
Do not use the power tool if the ON/OFF Knob (86) does not turn it on or off.
Any tool that cannot be controlled with the Power Switch is dangerous and must
be replaced.
Disconnect the Power Cord Plug from the power source before making any
adjustments, changing accessories, or storing the tool. Such preventive safety
measures reduce the risk of starting the tool accidentally.
Store idle tools out of reach of children and other untrained persons. Tools
are dangerous in the hands of untrained users.
Maintain tools with care. Keep cutting tools sharp and clean. Properly main-
tained tools with a sharp cutting edge are less likely to bind and are easier to control.
Do not use a damaged tool. Tag damaged tools “Do not use” until repaired.
Check for misalignment or binding of moving parts, breakage of parts, and any
other condition that may affect the tool’s operation. If damaged, have the tool
serviced before using. Many accidents are caused by poorly maintained tools.
Use only accessories that are recommended by the manufacturer for your
model. Accessories that may be suitable for one tool may become hazardous
when used on another tool.
SERVICE
Tool service must be performed only by qualified repair personnel. Service
or maintenance performed by unqualified personnel could result in a risk of injury
When servicing a tool, use only identical replacement parts. Follow in-
structions in the “Inspection, Maintenance, And Cleaning” section of this
manual. Use of unauthorized parts or failure to follow maintenance instructions
may create a risk of electric shock or injury.
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SKU 93351 For technical questions, please call 1-800-444-3353. Page 5
SPECIFIC SAFETY RULES
WARNING! Your Warranty is voided if:
You do not put compressor oil in the Compressor’s crankcase prior to its
first use. Before each use, check the oil level. Never run the Compressor
with low or no compressor oil. Running the Compressor with low or no
oil will permanently damage the unit.
You use an extension cord with the Air Compressor. Connect the Air
Compressor’s Power Cord Plug directly to the nearest 120 volt, grounded,
electrical outlet. If necessary, attach a longer air hose to the Compressor.
You drop the Air Compressor. Do not lift the Air Compressor using its
Handle.
This Air Compressor may require a dedicated electrical circuit, as the amper-
age draw under full load combined with use of any other item may overload
your circuit.
Maintain labels and nameplates on the Air Compressor. These carry important
information. If unreadable or missing, contact Harbor Freight Tools for a replace-
ment.
Always wear ANSI-approved safety impact eye goggles when assembling and
using the Air Compressor.
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 ob-
structions, grease, oil, trash, and other debris.
DANGER! This Air Compressor is NOT equipped and should not be used “as is”
to supply breathing quality air. For any application of air for human consumption,
you must fit the Air Compressor with suitable inline safety and alarm equipment
(not included). This additional equipment is necessary to properly filter and purify
the air to meet minimal specifications for Grade D breathing as described in Com-
pressed Gas Association Commodity Specification G 7.1-1966, OSHA 29 CFR
1910. 134, and/or Canadian Standards Associations (CSA). In the event the Air
Compressor is used for the purpose of breathing air application and proper inline
safety and alarm equipment is not simultaneously used, existing warranties are void,
and Harbor Freight Tools disclaims any liability whatsoever for any loss, personal
injury, or damage.
DANGER! Never attempt to repair or modify the Tank (50). Welding, drilling, or
any other modification will weaken the Tank resulting in damage from rupture or
explosion. Always replace worn, cracked, or damaged Tanks.
1.
a.
b.
c.
2.
3.
4.
5.
6.
7.

SKU 93351 For technical questions, please call 1-800-444-3353. Page 6
WARNING! Never use plastic (PVC) pipe for compressed air. Serious injury or death
could result. Any tube, pipe, or hose used must have a pressure rating higher than
150 PSI. Minimum recommended pipe size: Up to 50 feet long use 1/2” diameter.
Greater than 50 feet use 3/4” diameter. Larger diameter pipe is always better.
This Air Compressor is not designed for outdoor use.
WARNING! This Air Compressor is extremely top heavy. The unit must be bolted
to the floor with isolation pads (not included) or secured with a wall cable (not in-
cluded) before operating to prevent equipment damage, injury, or death.
(See Illustration Below.)
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 85 PSI to 110 PSI.
Drain the Air Compressor every day. Do not allow excessive moisture to build
up inside the Air Compressor’s Tank.
Avoid injury. Never direct the Air Outlet Valve at people or animals.
Do not alter or remove the Safety Valve (67). Do not open the Pressure Switch
Box (66).
Do not handle the ON/OFF Knob (86) or Power Cord Plug with wet hands.
Make sure the Air Compressor is located on a flat, level, sturdy surface capable
of supporting the weight of the Compressor, operator(s), and any additional
tools and equipment.
Keep all electrical connections dry and off the ground.
Industrial applications must follow OSHA guidelines.
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WALL CABLE
(NOT INCLUDED)
WALL CABLE
(NOT INCLUDED)
ISOLATION PAD
(NOT INCLUDED)
ISOLATION PAD
(NOT INCLUDED)
WALL CABLE
(NOT INCLUDED)
WALL CABLE
(NOT INCLUDED)
ISOLATION PAD
(NOT INCLUDED)
ISOLATION PAD
(NOT INCLUDED)
REV 05/06

SKU 93351 For technical questions, please call 1-800-444-3353. Page 7
Never stand on the Air Compressor. Serious injury could result if the Compres-
sor is tipped.
Never leave the Air Compressor unattended when it is plugged in and running.
Turn off the Compressor, and unplug the unit before leaving.
Do not allow children and other unauthorized people to handle or play with
the Air Compressor.
Always turn off the Air Compressor and unplug it from its electrical outlet
before performing any inspection, maintenance, or cleaning.
WARNING! This product contains brass, which is a chemical known to the State of
California to cause cancer and birth defects and other reproductive harm. (California
Health & Safety Code 25249.5, et seq.)
WARNING! People with pacemakers should consult their physician(s) before using
this product. Operation of electrical equipment in close proximity to a heart pace-
maker could cause interference to or failure of the pacemaker.
WARNING! The warnings and cautions discussed in this 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
product, but must be supplied by the operator.
SAVE THESE INSTRUCTIONS
19.
20.
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25.
To extend the life of your tools and equipment, it is recommended that you
install an oiler and water filter inline with the air output line of the Air Compressor.
(See Figure A.)
OILER
WATER
FILTER
REGULATOR
FIGURE A

SKU 93351 For technical questions, please call 1-800-444-3353. Page 8
GROUNDING
GROUNDED TOOLS: TOOLS WITH THREE PRONG PLUGS
1. Tools marked with “Grounding Required” have a three wire cord and three prong
grounding plug. The plug must be connected to a properly grounded outlet. If
the tool should electrically malfunction or break down, grounding provides a low
resistance path to carry electricity away from the user, reducing the risk of elec-
tric shock. (See Figure B, next page.)
2. The grounding prong in the plug is connected through the green wire inside the
cord to the grounding system in the tool. The green wire in the cord must be the
only wire connected to the tool’s grounding system and must never be attached
to an electrically “live” terminal. (See Figure B.)
3. Your tool must be plugged into an appropriate outlet, properly installed and
grounded in accordance with all codes and ordinances. The plug and outlet
should look like those in the following illustration. (See Figure B.)
120 VOLT,
GROUNDED,
ELECTRICAL OUTLET
THIS PRODUCT
USES A
3-PRONG PLUG
FIGURE B
WARNING!
Improperly connecting the grounding wire can result in the risk of electric shock.
Check with a qualified electrician if you are in doubt as to whether the outlet is
properly grounded. Do not modify the power cord plug provided with the tool.
Never remove the grounding prong from the plug. Do not use the tool if the power
cord or plug is damaged. If damaged, have it repaired by a service facility before
use. If the plug will not fit the outlet, have a proper outlet installed by a qualified
electrician.

SKU 93351 For technical questions, please call 1-800-444-3353. Page 9
DOUBLE INSULATED TOOLS: TOOLS WITH TWO PRONG PLUGS
4. Tools marked “Double Insulated” do not require grounding. They have a special
double insulation system which satisfies OSHA requirements and complies with
the applicable standards of Underwriters Laboratories, Inc., the Canadian
Standard Association, and the National Electrical Code. (See Figure C.)
5. Double insulated tools may be used in either of the 120 volt outlets shown in the
following illustration. (See Figure C.)
120 VOLT,
GROUNDED,
ELECTRICAL OUTLET
120 VOLT,
GROUNDED,
ELECTRICAL OUTLET
FIGURE C
SYMBOLOGY
Double Insulated
Canadian Standards Association
Underwriters Laboratories, Inc.
V~ Volts Alternating Current
AAmperes
n0xxxx/min. No Load Revolutions per Minute (RPM)

SKU 93351 For technical questions, please call 1-800-444-3353. Page 10
UNPACKING
When unpacking, check to make sure all the parts shown on the Parts List on page 17
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.
ASSEMBLY INSTRUCTIONS
CAUTION! Always make sure the ON/OFF Switch (86) of the Air
Compressor is in its “OFF” position and the unit is unplugged from its electrical
outlet prior to assembling the Compressor or making adjustments to the unit.
To Attach The Handle And Wheels:
1. To attach the Handle (50A) to the Tank (50) of the Air Compressor, align the two
mounting holes in the Handle with the two mounting holes in the Tank. Secure
the Handle to the Tank, using the two Lock Knobs (50B). (See Figure E.)
2. To Attach the two Wheels (53) to the Tank (50) of the Air Compressor, insert a
Wheel (53) on each end of an Axle (53A). Secure the Wheels to the Axles, using
two Retaining Rings (54), then two Bolts (93). (See Figure E.)
WHEEL (53) WHEEL (53)
RETAINING RING (54) RETAINING RING (54)
AXLE (53A) AXLE (53A)
HANDLE (50A)
LOCK KNOB (50B)
LOCK KNOB (50B)
FIGURE E
REV 05/06
BOLT (93) BOLT (93)