DeWalt 66-651 To Check Safety Valve, To Drain Tank, Air Filter Inspection and Replacement

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To ensure efficient operation and longer life of the air compressor outfit, a routine maintenance schedule should be prepared and followed. The following routine maintenance schedule is geared to an outfit in a normal working environment operating on a daily basis. If necessary, the schedule should be modified to suit the conditions under which your compressor is used. The modifications will depend upon the hours of operation and the working environment. Compressor outfits in an extremely dirty and/or hostile environment will require a greater frequency of all maintenance checks.

NOTE: See "Operation" section for the location of controls.

To Check Safety Valve

If the safety valve does not work properly, over- pressurization may occur, causing air tank rupture or an

explosion.

1.Before starting compressor, pull the ring on the safety valve to make sure that the safety valve operates freely. If the valve is stuck or does not operate smoothly, it must be replaced with the same type of valve.

To Drain Tank

1.Set the On/Auto/Off lever to "OFF".

2.Pull the regulator knob out and turn clockwise to set the outlet pressure to zero.

3.Remove the air tool or accessory.

4.Pull ring on safety valve allowing air to bleed from the tank until tank pressure is approximately 20 psi. Release safety valve ring.

5.Drain water from air tank by opening drain valve (counter-clockwise) on bottom of tank.

Water will condense in the air tank. If not drained, water will corrode and weaken the air tank causing a risk of air

tank rupture.

6.After the water has been drained, close the drain valve (clockwise). The air compressor can now be stored.

NOTE: If drain valve is plugged, release all air pressure. The valve can then be removed, cleaned, the reinstalled.

Air Filter Inspection and Replacement

Hot surfaces. Risk of burn. Compressor heads are exposed when filter cover is removed. Allow

compressor to cool prior to servicing.

Keep the air filter clean at all times. Do not operate the air compressor with the air filter removed.

A dirty air filter will not allow the compressor pump to operate at full capacity. Before you use the compressor pump, check the air filter to be sure it is clean and in place.

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Contents Oil-Free Air Compressor Important Safety Instructions Safety Guidelines DefinitionsHazard Attachments & Accessories Hazard What can Happen HOW to Prevent IT Fire, Inhalation, Damage to Vehicle Surfaces Duty Cycle SpecificationsAccessories GlossaryAssemble Wheels AssemblyTools Required for Assembly UnpackingLocation of the Air Compressor InstallationVoltage and Circuit Protection Extension CordsKnow Your Air Compressor Description of Operation OperationBefore Starting How to StopHow to Start Before Each Start-UpCustomer Responsibilities To Check Safety Valve Air Filter Inspection and ReplacementTo Drain Tank Service and Adjustments To Replace or Clean Check ValveAir Compressor Pump Intake and Exhaust Valves To Replace Regulator Storage Problem Cause Correction TroubleshootingPressure reading Check wiring connection AIR Compressor Diagram Key Part Number Description Parts ListAIR Compressor Pump Diagram KEY Part Description Limited Warranty