Harbor Freight Tools 42321 Air Compressor User Manual


 
SKU 42321 For technical questions, please call 1-800-444-3353. Page 8
Operation
Caution: Prior to use, inspect the compressor or any damaged parts or unsafe condi-
tions. Make any necessary repairs before using again.
Turning Compressor On
1. Verify Tank Drain Valve (A-7) is closed.
2.
Verify oil level is correct.
3. Verify that the Safety Valve (A-4) is operational.
4. Turn the Air Flow Valve (A-8) to the OFF position.
5. Plug the power cord into a electrical outlet with a grounding prong.
6. Turn the ON/OFF Switch Lever(A-5) down to turn on. Turn the Switch Lever up
to shut off.Allow the pressure to build up to at least 80 PSI before using air.
7. Open the Air Flow Valve (A-8) and check for air leaks.
The operation of the compressor is automatic, as controlled by the an internal pressure
switch. When the pressure drops below its operating range the compressor turns on.
When the pressure is above 115 PSI, the compressor shuts off.
Warning; The compressor may become very hot during operation. Do not touch the
cylinder area of the compressor, or allow flammable materials to come in contact with
the cylinder area.
Adjusting Pressure Gauge and Pressure Adjustment Screw
Caution: The Pressure Switch is adjustable but changes to the pressure levels are not
recommended; any change to the automatic ON/OFF pressure levels will cause addi-
tional stress on the motor which may shorten motor life.
Adjusting Air Output
1. When the Lever of the Air Flow Valve (A-8) is to the up or down position, the valve is closed.
When it is in the middle, it is open.
2. Turn the Air Flow Valve to the appropriate pressure.
Maintenance
Warning: Do not make any repairs, adjustments, or maintenance on the air compressor
unless it is disconnected from the electrical power and the tank pressure is released.
Maintenance should always be performed by a qualified technician.
1.
Check the oil level before each use. If the oil is low, add some. If it is high, drain some
by removing the Drain Plug. Replace the oil once a year.
2. Check and clean the Air Filter (B-5) every 50 hours, or sooner if used in a dusty
environment.
REV 02/04