40 PSI twin cylinder air compressor pump for 3 HP motor Model 93785 Set up and 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© 2009 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.
Contents ASSEMBLY DIAGRAM ���������������� 18 LIMITED 90 DAY WARRANTY ���� 19 Important SAFETY Information ���������������������������� 3 General Safety Warnings ������� 3 Compressor Pump Safety Warnings �������������������������������������� 4 Air Compressor Safety Warnings �������������������������������������� 5 Grounding (for Motor) �������� 7 Symbology ������������������������������������� 7 Specifications �������������������������� 8 Unpacking ���������������������������������� 8 Instructions for
not avoided, could result in minor or moderate injury. Save This Manual Keep this manual for the safety warnings and precautions, assembly, operating, inspection, maintenance and cleaning procedures. Write the product’s serial number in the back of the manual near the assembly diagram (or month and year of purchase if product has no number). Keep this manual and the receipt in a safe and dry place for future reference. NOTICE is used to address practices not related to personal injury.
and changing accessories. Keep the outside surfaces dry, clean and free from oil and grease. Check for misalignment or binding of moving parts, breakage of parts and any other condition that may affect the compressor pump’s operation. If damaged, have the compressor pump repaired before use. Many accidents are caused by a poorly maintained compressor pump. while operating a compressor pump may result in serious personal injury. b. Use personal protective equipment. Always wear eye protection.
. Misalignment between Motor and Pump can damage the Belt Wheel. Use a straight edge, such as a yardstick, to check and adjust alignment as needed. 6. Use proper size motor and motor pulley. This air compressor Pump must be installed with a 3 HP electric motor and pulley (both not supplied) which can turn the Air Compressor Belt Wheel at approximately 1050 rpm, but not more than 1200 rpm. 7. Install motor, pulley belt and pulley belt cover securely.
the manufacturer may result in a risk of injury to persons. 13. All air line components, including hoses, pipe, connectors, filters, etc., must be rated for a minimum working pressure of 150% of the maximum system pressure. 14. USE OF AN EXTENSION CORD IS NOT RECOMMENDED. If you choose to use an extension cord, use the following guidelines: RECOMMENDED MINIMUM WIRE GAUGE FOR EXTENSION CORDS (120 VOLT) NAMEPLATE AMPERES (at full load) EXTENSION CORD LENGTH 25’ 50’ 100’ 150’ 0–6 18 16 16 14 6.
product, but must be supplied by the operator. Save these instructions. Grounding (for Motor) To prevent electric shock and death from incorrect grounding wire connection: 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 motor. Never remove the grounding prong from the plug. Do not use the motor if the power cord or plug is damaged. If damaged, have it repaired by a service facility before use.
any adjustments to the motor, tank, and/or compressor pump. Specifications Compressor Type Single Stage Twin Cylinder Maximum Air Pressure 140 PSI Maximum Speed 1200 RPM Air Delivery (@ 1050 RPM) Oil Type Flywheel Belt Type 10 SCFM @ 40 PSI 8 SCFM @ 90 PSI 7.4 SCFM @ 115 PSI SAE 30W non-detergent Air Compressor Oil (Sold separately) (SKU 95048) 10-1/4” dia.
Assembly 1. 2. Make sure that the inner faces of the wheel socket as well as the Crankshaft (29) are clean and free of burrs and roughness. Apply a thin layer of grease to the interior of the socket and, with the ridge end of the beltway pointing towards the compressor, slide the Belt Wheel (35) over the Crankshaft. WARNING! Do not force or hammer the Belt Wheel onto the Crankshaft. Washer Bolt (32) (34) CAUTION: Avoid damage to the Air Compressor Pump and other equipment.
.25 x 1050 1725 = 6.24” Or, use the following equation if you have a 3450 RPM motor: 10.25 x 1050 3450 2. = 3.12” The 10-1/4 inch V-groove Belt Wheel (35) of the Air Compressor Pump must be in perfect alignment with the motor pulley (not included). Note: Ensure the Belt Wheel is installed for counter-clockwise rotation when facing the Belt Wheel side of the Pump. CAUTION: Misalignment between Motor and Pump can damage the Belt Wheel.
contractor for semi-automatic control of air pressure in the vessel. WARNING! Avoid serious injuries. Do not operate this Air Compressor Pump without a pulley guard in place. Coupler Plug Coupler Plug Tool Quick Coupler Shut Off Valve Oiler Air Hose on Reel Checking the Oil Check the oil level before operation. Fill the Pump Crankcase with air SAE 30W non-detergent compressor oil (sold separately).
Note: SAE 30W non-detergent Air Compressor Oil (sold separately) is recommended for use with this pump. If uncertain which oil to use, please call Harbor Freight Tools customer service at 1-800-444-3353 for assistance. Change the compressor oil after the first hour of use to remove any debris. WARNING! To prevent serious injury from burns: Do not add or change the oil while the motor is in operation. Allow the components to cool before replacing oil.
. Adjust the Air Compressor’s Pressure Regulator so that the air output is enough to properly power the tool, but the output will not exceed the tool’s maximum air pressure at any time. Turn the knob clockwise to increase the pressure and counterclockwise to decrease pressure. Adjust the pressure gradually, while checking the air output gauge to set the pressure. Maintenance And Servicing Procedures not specifically explained in this manual must be performed only by a qualified technician.
Maintenance Schedule Following are general guidelines for maintenance checks of the unit. Note: The working environment and frequency of use can affect how often you will need to check components and perform maintenance procedures. Daily: a. Check oil level. b. Check for oil leaks. c. Make sure all fasteners are tight. d. Drain moisture from air tank. e. Check for abnormal noise or vibration. f. Check for air leaks.* g. Inspect drive belt. h. Wipe off any oil or dirt from the components.** Weekly: a.
Note: Do not open the Drain Valve so that more than four threads are showing. To empty the air and condensation: a. Make sure the Power switch of the compressor is off. b. Place a collection pan under the Drain Valve. c. Unthread the Drain Valve two or three turns ONLY. d. When all the pressure and moisture is released, close the Drain Valve. Air Filter Maintenance Check the Air Filter weekly to see if it needs replacement. If working in dirty environments, you may need to replace the filter more often.
Troubleshooting Problem Compressor does not start or restart Possible Causes 1. Incorrect power supply. 2. No power at outlet. 3. Power cord not plugged in properly. 4. Thermal overload switch tripped. 5. Building power supply circuit tripped or blown fuse. 6. 7. Compressor builds pressure too slowly 8. 1. 2. 3. 4. 4. Turn off Tool. Turn off Compressor and wait for it to cool down. Press reset button. Resume operation. 5. Reset circuit or replace fuse. Check for low voltage conditions.
Problem Overheating Compressor starts and stops excessively Excessive noise Moisture in discharge air Oil in discharge air Safety Valve “pops” Possible Causes Likely Solutions 1. Filters need cleaning/replacing. 1. Check inlet and outlet filters. Clean and/or replace as needed. 2. Crankcase oil too thin or 2. Drain oil and refill to proper level with recommended incorrect type. oil. 3. Crankcase oil level too low. 3. Add oil to proper level, check for leaks. 4. Unusually dusty environment. 4.
PLEASE READ THE FOLLOWING CAREFULLY The manufacturer and/or distributor has provided the parts list and assembly diagram in this manual as a reference tool only. Neither the manufacturer or distributor makes any representation or warranty of any kind to the buyer that he or she is qualified to make any repairs to the product, or that he or she is qualified to replace any parts of the product.
ASSEMBLY DIAGRAM Record Product’s Serial Number Here: Note: If product has no serial number, record month and year of purchase instead. Note: Some parts are listed and shown for illustration purposes only, and are not available individually as replacement parts. SKU 93785 For technical questions, please call 1-800-444-3353.
LIMITED 90 DAY WARRANTY Harbor Freight Tools Co. makes every effort to assure that its products meet high quality and durability standards, and warrants to the original purchaser that this product is free from defects in materials and workmanship for the period of 90 days from the date of purchase.