Harbor Freight Tools Air Compressor 93785 User Manual

3 HP  
Air Compressor Pump  
93785  
ASSEMBLY AND OPERATING INSTRUCTIONS  
Due to continuing improvements, actual product may differ slightly from the product described herein.  
3491 Mission Oaks Blvd., Camarillo, CA 93011  
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.  
For technical questions and replacement parts, please call 1-800-444-3353  
 
6. Dress properly. Do not wear loose clothing or jewelry as they can be caught  
in moving parts. Protective, electrically non-conductive clothes and non-skid  
footwear are recommended when working. Wear restrictive hair covering to  
contain long hair.  
7. Use eye and ear protection. Always wear ANSI approved impact safety  
goggles. Wear a full face shield if you are producing metal filings or wood  
chips. Wear an ANSI approved dust mask or respirator when working around  
metal, wood, and chemical dusts and mists.  
8. Do not overreach. Keep proper footing and balance at all times. Do not reach  
over or across running machines.  
9. Maintain tools with care. Keep tools maintained and clean for better and  
safer performance. Follow instructions for lubricating and changing  
accessories. Inspect tool cords periodically and, if damaged, have them  
repaired by an authorized technician.  
10. Disconnect power. Unplug drive motor when not in use.  
11. Remove adjusting keys and wrenches. Check that keys and adjusting  
wrenches are removed from the tool or machine work surface before starting work.  
12. Avoid unintentional starting. Be sure the drive motor power switch is in the  
Off position when not in use and before plugging in.  
13. Stay alert. Watch what you are doing, use common sense. Do not operate  
any tool when you are tired.  
14. Check for damaged parts. Before using any tool, any part that appears  
damaged should be carefully checked to determine that it will operate properly  
and perform its intended function. Check for alignment and binding of moving  
parts; any broken parts or mounting fixtures; and any other condition that may  
affect proper operation. Any part that is damaged should be properly repaired  
or replaced by a qualified technician. Do not use the tool if any switch does  
not turn On and Off properly.  
15. Guard against electric shock. Prevent body contact with grounded surfaces  
such as pipes, radiators, ranges, and refrigerator enclosures.  
16. Replacement parts and accessories. When servicing, use only identical  
replacement parts. Use of any other parts will void the warranty. Only use  
accessories intended for use with this tool. Approved accessories are  
available from Harbor FreightTools.  
17. Do not operate tool if under the influence of alcohol or drugs. Read  
warning labels if taking prescription medicine to determine if your judgment or  
reflexes are impaired while taking drugs. If there is any doubt, do not operate  
the tool.  
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18. Maintenance. For your safety, service and maintenance should be performed  
regularly by a qualified technician.  
Note: Performance of this Air Compressor Pump may vary depending on variations  
in local line voltage or motor capacity. Extension cord usage may also affect  
tool performance.  
19. Use proper size and type extension cord. If an extension cord is required, it  
must be of the proper size and type to supply the correct current to the tool  
without heating up. Otherwise, the extension cord could melt and catch fire, or  
cause electrical damage to the tool. Longer extension cords require larger  
size wire. If you are using the tool outdoors, use an extension cord rated for  
outdoor use. (signified by “WA” on the jacket). Check with the manufacturer of  
the electric motor (not included) for the proper power supply requirements.  
20. Maintenance. For your safety, service and maintenance should be performed  
regularly by a qualified technician.  
Warning:The warnings, cautions, and instructions discussed in this instruction  
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.  
NOTE:This item must be properly mounted on a strong, level surface which is  
capable of holding the compressor weight, and the forces put on it during  
operation. A properly sized motor (not included) must also be mounted on a  
level and sufficiently strong surface.The motor and pump must be connected  
with a V shaped drive belt (not included). The drive belt must be completely  
enclosed in a sturdy belt cover (not included).  
WARNING: By supplying this air compressor, Harbor Freight Tools makes no  
representations and accepts no responsibility for the motor,V-belt, enclosure  
or mounting surface not supplied by HFT which may be used in the installation.  
You are strongly advised to have this air compressor properly installed by a  
qualified service technician using appropriate components in good condition.  
REV 02/07  
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Air Compressor Pump Safety Precautions  
1. 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 (35) at approximately 1050 rpm, but  
not more than 1200 rpm.  
2. Install motor, pully belt and pully belt cover securely. Be sure to use the  
proper size bolts to install your motor (not included). The belt and belt cover  
(not included) must be strong enough to prevent breaking and possible injury.  
3. Be sure all equipment is rated to the appropriate capacity of this pump.  
Make sure that the lowest rated piece of equipment you are using can handle  
the maximum pressure of the Air Compressor Pump (see Specifications).  
4. Avoid explosions and fire. Never place flammable objects near the compressor.  
Never spray water or any flammable liquids towards the compressor.  
5. Avoid bodily injury. Never direct the air outlet at any person or animal.  
6. Use Safety Guard for Pulleys. The Air Compressor Belt Wheel (35), V-belt  
(not supplied), and motor pulley (not supplied) must be covered by a safety  
guard (not supplied) covering all moving elements before operation.  
7. Avoid burns. The Cylinder (12), Cylinder Head (5) and Air Outlet (6) become  
very hot during operation. Do not touch.  
8. Industrial Applications. If used in an industrial applications, you must follow  
OSHA requirements.  
9. Properly fill Air Compressor Pump oil reservoir before operating. Fill  
the oil reservoir with a premium quality, 30-weight, non-detergent oil before  
operating. Check oil level through the Oil Level Window before each use.  
Running the Air Compressor Pump with little or no oil will cause damage to  
the pump and void the warranty.  
Recommended Compressed Air System Components  
We recommend that you use both a filter and an in-line oiler in your air supply system  
as illustrated in the diagram below.These components are not included with this tool,  
Air Tool  
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Unpacking  
When unpacking, check to make sure that the product is intact and  
undamaged. If any parts are missing or broken, please call Harbor Freight  
Tools at the number on the cover of this manual as soon as possible.  
Installation  
Note: Depending on your level of expertise, you may wish to have a qualified  
technician perform this installation.  
Caution: Avoid damage to the Air Compressor Pump and other equipment. Make  
sure the mounting surface for the Air Compressor Pump is installed on a flat  
and level surface, strong enough to support the pump and motor.  
1. Place the Air Compressor Pump on the mounting surface at the same level as the 3  
HP motor used to drive it. The 14-¼ inch V-groove Belt Wheel (35) of the Air  
Compressor Pump must be in perfect alignment with the motor pulley (not included).  
2. Verify that the BeltWheel (35) turns freely where it overhangs the mounting surface.  
3. Place theV-groove belts (not included) over the Belt Wheel (35) and motor pulley.  
4. Pull Compressor Pump until properly aligned, and the belt is tight. Recheck  
motor pulley, V-groove belt, and Belt Wheel alignment.  
5. Use a pencil to mark through the Air Compressor Pump mounting holes onto  
the mounting surface.  
6. Move the Air Compressor Pump and drill four 3/8 inch holes in the mounting surface.  
7. Move the Air Compressor Pump back to its mounting position.  
8. Secure each corner of the base with a 3/8 inch diameter bolt, washer, lock  
washer, and nut (all not supplied).  
9. Make final alignment and belt tightness adjustments from the motor. It may be  
necessary to loosen the motor mounting bolts to adjust the motor location.To  
test the proper tension on the V-belts, press down on the belts, they should  
not depress more than 1/2 inch at mid-point.Tighten all mounting hardware.  
10. Mount the motor (not supplied) as recommended by the motor manufacturer.  
Be sure that the motor is securely mounted.  
11. Connect plumbing hardware (not supplied) from the male ½” - 14 tpi Air Outlet  
(6) to the air destination (i.e., air pressure tank, not supplied).  
12. Install a safety guard (not supplied) that surrounds the motor pulley, V-belts,  
and Belt Wheel (35). This safety guard must cover all sides of the moving  
belts and pulleys. It should have a clearance of about one inch from the  
moving parts.The safety guard must be sturdy enough to prevent injury.  
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Note: A qualified electrician must wire in a pressure switch control that turns off  
the motor when the pump reaches the desired pressure (less than 140 PSI).  
Note: Always install this Air Compressor Pump to an air tank that has a pressure  
release valve set at less than 140 PSI.  
Note: A high/low cut-in/cut-out switch (not included) can be incorporated to operate  
a motor starter or motor contractor for semi-automatic control of air pressure  
in the vessel.  
Warning: Avoid serious injuries.Do not operate this Air Compressor Pump without  
the Safety Guard in place.  
Air Filter (4)  
13. Unscrew the Oil Filler Cap (44) and fill the oil  
reservoir to mid point as seen in the Oil Window  
(22). The oil should be premium qualify, 30-  
weight, non-detergent oil. Do not overfill.  
Operation  
1. Turn on the power switch to the drive motor.  
2. Check the following items:  
-V-belt should not vibrate.  
- Listen for air leaks.  
- Listen for abnormal noise or vibration.  
- If there is a problem, turn power off and  
Oil Filler Cap (44)  
Oil Window (22)  
release air pressure from the line before attempting repairs.  
3. Allow Air Compressor Pump to cool down after each hour of use.  
4. Turn off the power switch to the drive motor when finished using the Air  
Compressor Pump. Do not leave on if the compressed air is not being used.  
Maintenance  
Caution: Remove power from the drive motor before attempting any maintenance  
on the Air Compressor Pump.  
1. Before each use, verify that the oil level is at the proper level as viewed through  
the Oil Window (22).  
2. Periodically check V-belts for proper tension.  
3. Periodically remove Air Filter (4) and blow clean with compressed air. If it is  
dark in color and will not blow clean, replace the filter.  
4. If the oil appears dirty, open the Oil Filler Cap (44), and remove the Oil Drain  
Bolt (24), capturing the oil in a suitable container. Dispose of the used oil in  
accordance with local regulations. Replace the Oil Drain Bolt, and refill as  
discussed in item 12 above.  
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Parts List  
Part # Description  
QTY.  
16  
Part # Description  
23 Oil Window Gasket  
24 Oil Drain Bolt  
QTY.  
1
1
2
Washer  
Bolt  
14  
6
2
1
1
1
1
4
1
4
1
1
6
1
1
1
2
1
6
1
1
1
3
Screw  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
Seal  
1
4
Air Filter  
Gasket  
1
5
Cylinder Head  
Air Outlet  
Base Cover  
Bearing  
1
6
2
7*  
8*  
9*  
10*  
11*  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
Gasket Valve Seat  
Valve Seat  
Gasket Valve Seat  
Valve Plate  
Cylinder Head Gasket  
Cylinder  
Crankshaft  
Oil Seal  
1
1
End Cover  
Screw  
1
1
Spring Washer  
Washer  
1
1
Screw  
Belt Wheel  
Nut  
1
Cylinder Gasket  
Dipstick  
1
Screw  
4
Crankshaft Case  
Gasket  
Connecting Rod  
Piston Pin  
Lock Ring  
Piston  
2
2
Gasket  
4
Washer  
2
Spring Washer  
Bolt  
42** Piston Oil Ring  
43** Piston Air Ring  
2
4
Oil Window  
44  
45  
46  
Oil Filler Cap (not shown)  
1
Cylinder Gasket & Reed Valve Kit  
Piston Ring Kit  
1
1
NOTE: Parts # 7*-11* are sold only as an assembly called the “Cylinder Gasket &  
Reed Valve Kit”. Parts number # 42** and 43** are sold only as a set called “Piston  
Ring Set”.  
NOTE: Some parts are listed and shown for illustration purposes only and are not  
available individually as replacement parts.  
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Assembly Drawing  
44  
PLEASE READ THE FOLLOWING CAREFULLY  
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS DIAGRAM  
IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER NOR  
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. IN FACT,  
THE MANUFACTURER AND/OR DISTRIBUTOR EXPRESSLY STATES THAT ALL REPAIRS  
AND PARTS REPLACEMENTS SHOULD BE UNDERTAKEN BY CERTIFIED AND  
LICENSED TECHNICIANS AND NOT BY THE BUYER. THE BUYER ASSUMES ALL RISK  
AND LIABILITY ARISING OUT OF HIS OR HER REPAIRS TO THE ORIGINAL PRODUCT  
OR REPLACEMENT PARTS THERETO, OR ARISING OUT OF HIS OR HER INSTALLATION  
OF REPLACEMENT PARTS THERETO.  
SKU 93785 DowFnoloradtefrcohmnWicwawl .qSuomesantiuoanlss.copmle. aAsll eMacnaulalls1S-8e0ar0ch-4A4n4d-D3o3w5n3load. Page 9  

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