® COMPRESSOR 4 HP - 10 GALLON Model 90234 OPERATING INSTRUCTIONS ® 3491 Mission Oaks Blvd., Camarillo, CA 93011 Visit our Web site at: http://www.harborfreight.com Copyright 2003 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.
PRODUCT SPECIFICATIONS Item Description Electrical Requirements 4 HP Peak / 3 HP Rated / 120 V / 60 Hz 3400 RPM; Two Capacitor Motor Thermal Overload Protection Maximum PSI 115 PSI Air Deliveries 4.5 SCFM @ 115 PSI / 5.6 SCFM @ 90 PSI 6.2 SCFM @ 70 PSI / 7.2 SCFM @ 40 PSI Air Tank Capacity 10 Gallons Automatic Shut-Off Automatic Restar t Automatic Shut-Off @ 115 PSI Automatic Restar t @ 85 PSI Oil Capacity 25.35 Ounces Air Outlet Size 1/4"-18 NPT Male Threads Net Weight 75.
2. 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. 3. 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. 4.
10. 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. 11. Avoid accidental starting. Be sure the Power Switch is off before plugging in. Carrying power tools with your finger on the Power Switch, or plugging in power tools with the Power Switch on, invites accidents. 12. Remove adjusting keys or wrenches before turning the power tool on.
the tool serviced before using. Many accidents are caused by poorly maintained tools. 21. 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 22. Tool service must be performed only by qualified repair personnel. Service or maintenance performed by unqualified personnel could result in a risk of injury. 23. When servicing a tool, use only identical replacement parts.
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 A.) FIGURE A 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.
SYMBOLOGY Double Insulated Canadian Standards Association Underwriters Laboratories, Inc. V~ A no xxxx/min. Volts Alternating Current Amperes No Load Revolutions per Minute (RPM) SPECIFIC SAFETY RULES 1. 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 this product in areas near flammable chemicals, dusts, and vapors. 2.
. When checking the oil level, make sure to unscrew (do not pull) the Oil Plug (part #78) out. 9. Drain the Air Compressor’s Tank (part #50) every day. Do not allow moisture to build up inside the Tank. Do not open the Tank Drain Valve (part #59) so that more than four threads are showing. 10. Avoid injury. Never direct the Air Outlet Valve (part #69) at people or animals. 11. Do not alter or remove the factory sealed Pressure Relief Valve (part #67). 12. Dress properly.
22. 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 or failure of the pacemaker. 23. WARNING! The warnings, precautions, and instructions discussed in this manual cannot cover all possible conditions and situations that may occur.
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 and void the warranty. To check the level of oil, make sure the Air Compressor is OFF. Then, observe the Oil Level Window (part #72). The level of oil should just reach the horizontal line as shown on the Oil Level Window. If the level of oil is below the horizontal line, remove the Oil Plug (part #78) and add new oil through the Oil Plug hole.
3. Make sure the Tank Drain Valve (part #59) is closed. (See Figure F.) 4. Make sure the “On/Off” Pressure Switch (part #66) is DOWN in its OFF position. Then, plug the Power Cord (part #64) into the nearest 120 volt, grounded, electrical outlet. (See Figure F.) 5. Pull UP on the “On/Off” Pressure Switch (part #66) to its ON position. (See Figure F.
8. Turn the Pressure Regulator (part #70) counterclockwise to increase the amount of compressed air to the air tool being used (from 90 PSI to 115 PSI). Turn the Pressure Regulator clockwise to decrease the amount of compressed air. (See Figure F.) 9. NOTE: If it is necessary to quickly depressurize the Air Compressor, turn off the Air Compressor by pushing DOWN on the “On/Off” Pressure Switch (part #66).
INSPECTION AND MAINTENANCE 1. WARNING! Always unplug the Air Compressor from its electrical outlet before performing any inspection, maintenance, or cleaning. 2. Before each use: Inspect the general condition of the Air Compressor. Check for misalignment or binding of moving parts, cracked or broken parts, damaged wiring, damaged air hose, and any other condition that may affect its safe operation. If abnormal noise or vibration occurs, have the problem corrected before further use.
PARTS LIST Part # Description Qty. Part # Description Qty.
PARTS LIST (CONTINUED) Part # Description Qty. Part # Description Qty. 53B Tank Wheel Cover 2 68 Nipple 1 54 Retaining Ring In Shaft 2 69 Air Outlet Valve 1 55 Exhaust Elbow 1 70 Pressure Regulator 1 56 Exhaust Copper Tube Assy. 1 71 Air Outlet Pressure Gauge 1 57 Check Valve 1 72 Oil Level Window 1 58 Unload Copper Tube Assy.
NOTE: Some parts are listed and shown for illustration purposes only, and are not available individually as replacement parts.