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Re: dewalt compressor not filling with air drained tank...
Some dewalt air compressors with single cylinder are known to develop trouble with reed valves and /or failed gaskets in head. Parts lists and parts are available at WWW.toolpartsdirect.com Simple test is to remove air filter and check for suction at intake. Bad reeds will tend to blow air out intake as pressure increases. Failed gaskets in head will cause very high temp at discharge hose. Parts are not too expensive. Enjoy
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This compressor is belt driven. When the belt fails the motor will run faster than normal and takes longer to stop turning. When belt is in place and the motor is shut off, the motor will stop almost instantly. If the belt is slipping, you will smell rubber burning (you will need to change the belt anyway). It is my opinion that the belt fails because the cut-off pressure is much to high (200psi). The belt will last longer is the pressure switch cut-out at a normal 125psi. If the discharge tube (tube from pump head to tank or in-tank check valve) or other parts are leaking, it will take much longer to fill and cause over-heating. You can keep track of the condition of the compressor internal parts by knowing how long it takes to fill the tank when new compared to how long it takes now. As parts wear, the unit will take longer to fill. Go to the dealer and time a new unit then test yours against this time period. Do not use an extension cord on this size compressor. Use more hose instead. If you are having trouble filling the tires because of low pressure in the hose, try experiment. Remove the safety valve from the compressor and install a tee fitting. One one port of the tee, reinstall the safety valve. On the second port install a quickconnect fitting. This will give you access to full tank pressure bypassing the regulator to quick fill your tractor tire. This trick is how the tire shop quickly fills a tire. Use caution and do not overfill your tire. Good luck
Sometimes the air regulator will limit the air volume and pressure when drawing a large quantity of air out of the tank. The regulator was most likely designed for nailing which has very little demand. For filling auto tires you may have to bypass the regulator. If your compressor has a safety valve, with 1/4 male pipe threads, remove the safety valve and install a nipple and tee fitting (let out all the air from the tank before removing the safety valve by pulling on the ring). Reinstall safety valve on one port and a quick connect on the other. Now you will have access to full tank pressure without the restriction of the regulator when needed. Good luck
You will most likely have to buy the manifold assembly from them. If you are mechanically inclined take the manifold assy. and check the check vale and the regulator. This is a common problem with there product. sorry for your pain.
Can you hear the air coming out? Or it is not pumping up at all? If the air is not coming out somewhere like the bypass or the regulator, or the drain plugs, then the reeds are shot in the head, it is an easy fix, and an easy part to get, I hope, call Dewalt's hotline and tell them what's happening, they will fix you up.
turn on and tap the top of the pin lightly also with no air in tank pull up and down on pin spray lightly with wd40 never let anyone use this pin valve to release pressure it will ruin the valve if you still have problems you can get a new universal check valve off the shelf at lowes for around $6 make sure you use thread tape when reinstalling
Hi Randy I had the same poroblm And it was the check valve. you can find it at toolpartsdirect.com for 15.26 Part # a19714 youll also find a brake down there which will be helpfull. Hope this helps. David