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I cannot seem to get the proper adjustment on the valve that releases the head pressure. Mine just leaks continuously or does not blow off pressure

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  • scottreider Sep 07, 2009

    I am not talking about the pressure relief valve for the tank I am talking about the head pressure relief valve on the case cover that is adjustable. It has a copper line going to it from the head and has a schrader valve inside it to release pressure. The crank has weights that relax and push a "button" which pushes on the schrader. This is the older style set up

  • scottreider Sep 10, 2009

    Proper setting was achieved (trial and error) through finely adjusting schrader distance to release valve. The valve was fine the constant air bleeding was due to dirt which had become lodged in the check valve.

  • scottreider Sep 10, 2009

    Proper setting was achieved (trial and error) through finely adjusting schrader distance to release valve. The valve was fine the constant air bleeding was due to dirt which had become lodged in the check valve

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This valve is defective, most likely from corrosion/pitting of the regulator spring and ball seal, you will need to replace it, these can be bought from the maker of the compressor, go to there web site and find there contact info or a local parts distributors

Posted on Sep 07, 2009

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  • Master
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It is bleeding off pressure like a pop off valve high pressure pop off safty valve. the pressure regulator has a adjustment on it.look for the T handle , watch for to much air pressure 110 is a lot.

Posted on Sep 07, 2009

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1 Answer

Wont build up air.What could be the problem


leaking pressure hose from cilinder to tank leak pressure switch a dirty check valve on the tank open it and look for a smooth clean rubber valve that can free move and no metal pieces in it if that is there found then a part in the hose line or membrane plates are broken , if you have a dry(oilless) compressor the piston ring and cylinder may be worn.
Several possibilitys depends on models The pressure reducing valve can also be faulty leaking drain at the bottom of the tank leaking the safety valve must be good closed and also the little pressure release unit the small black hose oft in many models in the pressure switch must be closed by start there can also some dirt comes in. .that it will not close and then its continu blow of normal you can hear that it closed by starting and always release the pressure air for the next start .

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Check all connections for air leak including the water drain valve with soapy water. If no air leaking from connections, spray soapy water on head area where head attaches to the cylinder checking for gasket leaks. If no leaks are found, most likely problem is in the head /valves /internal gasket leak. If head gasket or valves are leaking, you will notice that air seems to blow out of the intake filter (normally there is good suction at the intake). Good luck

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Air compressor not unloading


Check the pressure switch. The unloader valve is actually in the pressure switch where the small air line from the tank check valve attaches to it. When the pressure switch turns the motor off it then lets the head pressure bleed off so the motor can restart the next time pressure drops in the tank. If it's not working and bleeding off the head pressure the cold start valve (the one with the pin in it) also won't open so the motor can restart and warn up properly.

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Craftsman 5 HP MO-6436 Unit will run, pressurize, and hold pressure pretty good. But, after use has decreased pressure to the cut-off point where it should kick back on, it does not. Well, it turns...


If the unit does not unload properly the motor will have difficulty starting. Make sure that the intank check valve is not leaking air back out of tank (with pressure in tank, remove hose from compressor at tank checkvalve and spray soapy water). Replace as needed if leaking or try to repair. If the valve is not leaking then issue my be unloader valve at the pressure switch. Follow small airline from checkvalve to pressure switch. Small valve stem at the pressure switch should release air in line when pressure switch cuts off. Listen for small amount of air to be released when unit shuts off, if air continues to leak out, then check valve is leaking. Replace with generic parts making sure of fitting size. Good luck

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My compressor won't build pressure over 90lbs


Small leak will prevent the unit from building proper pressure. Check all connections with soapy water and repair as needed (including under cover). If no leaks are found check cylinder for scratches. Push piston to top of stroke and check walls for fine scratches. If scratched, pressure is leaking past vinyl piston ring. If no scratches or leaks, most likely reed valves, head gasket or combination of both. Easy test, with compressor running and attained 90 lbs, place finger over air intake and check for good suction (carefull could be hot) . If good suction, then air is leaking somewhere, of no suction suspect reed valves/worn cylinder, if air seems to be blowing out of intake, suspect reeds /gaskets. Good holidays

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I have d55155 and cant get over 60 psi, it never shuts off. how do i tell where the leak, o ring, or teflon tape should go. should the release valve be in a certain position? it seems down all the way


Could be leak or faulty valve plate in head. Use soapy water and spray all fittings including drain valve and pressure regulator. Repair as needed. If no leak found suspect problem with compressor. Try simple test, with compressor running and has reached max pressure (60psi) remove air filter and feel intake for suction. Be carefull could be hot. The suction should fairly strong. If no suction or actually feels like air is blowing out of intake, suspect valve plate. Parts are available at dewalt service center or www.toolpartsdirect.com. Good luck

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Single cylinder/oil free 5.5hp 30gal will fill tank when started with tank empty. When tank pressure is bleed off motor attempts to start, humms and kicks breaker.


If the unloader is not working properly the motor cannot overcome the head pressure. Two things to check. Make sure tank check valve is not leaking. Easy test. With pressure in tank, unplug the compressor from outlet and remove discharge hose at tank and listen for leak or spray soapy water. If leaking replace valve or try to clean debris from valve seat. If not leaking then problem is most likely at pressure switch unloader valve. Follow 1/4 inch hose from checkvalve at tank to connection at pressure switch. When pressure switch reaches cutoff pressure the switch opens the contacts and moves small tang against valve stem to release air from discharge hose. Check for proper function and repair as needed. Good luck.

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1 Answer

Unloader valve releases a lot of air when compressor shuts off and will not let the motor kick in blows breaker


This is usually a problem with the check valve. The unloader valve on your pressure switch is designed to bleed the pressure off the head of the compressor. With a leaking check valve the pressure isn't relieved from the head and the pump can't turn causing the motor to overload and blow the breakers.

To troubleshoot your problem try the following:

Trace the 1/4" line that connects to the unloader back to the tank. You'll find a fitting there. Remove the lines and then the fitting. Sometimes cleaning that valve will alleviate the problem. If not you need to replace the check valve.

Hope that helps.
-under_psi

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1 Answer

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Hi, I suspect the plunger for the valve stem connector on the pressure head is not depressing the air release pin in the head of the valve stem.

I have a Black and Decker and have to use a valve stem seat removal tool to quicky unscrew about 3 to 4 turns the stem seal and then connect the air hose head. After the tire reaches the correct air pressure I have go thru the tighten the valve stem seat drill.

You can buy the vavle stem seat tool at any auto parts store. I keep mine with the compressor.

I don't want this to sound bad but... is the air hose supply vavle turned on? Some have a slider button on the valve you have to push to charge the hose. If the hose is charged then see above.

Thanks for using FixYa.

Kelly

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