Question about Northern Industrial 2 Hp 6 Gallons Electric Air Compressor

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Compressor with head unloaders. Do I use a check valve with unloader port or a switch with a unloader on it?

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Honestly you can use either. Some compressors come with both. My personal preference is the head mounted unloader valve because it's far more reliable and a lot less complicated.

However if you use a switch mounted unloader valve you can connect the tubing to either the head or the tank check valve.
Anywhere on the backside (between the check valve to the head), of the tank check valve is fine

Posted on Nov 17, 2009

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1 Answer

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.

Sep 09, 2012 | Dewalt D55153 1.1 HP Continuous 4 Gallon...

1 Answer

I have a Craftsman compressor Model # 919-15292 2. The compressor stopped building pressure because air was continually being released through the unloader valve. I have replaced the unloader valve,...


you must have wired the new pressure switch incorrectly .when the pressure switch opens it will release the head pressure so your compressor must be running with the pressure switch contacts open should be 4 connections 2 marked motor which is from your compressor and 2 marked line which is your power coming in

Jun 15, 2011 | Craftsman 33 gal Air Compressor 6 hp...

1 Answer

When the compressor pressures up to set point (125psi) the unloader port opens but remains open therefore the tank begins to loose pressure. In addition when the tank pressure drops to startup set point...


The unloader port should only unload the compressor head, so there is a valve leaking in the system, probably where the fitting that the unloader valve tees into and that also takes the compressor head output to the receiver. With the receiver at pressure, if you remove the unloader line there should not be any air coming out of it.

Apr 12, 2011 | Ingersoll Rand - Rand Type - 30...

1 Answer

My compressor builds to 125 psi then shuts off like it should then when the pressure is released the compressor wont start back up. Sometimes it will attempt to start and it sounds like the motor is...


When a compressor reaches set pressure, there should be a release of air from discharge hose thru the unloader. This release of air unloads the compressor head pressure. The unloader is usually located within the pressure switch. Easy to check. Follow discharge hose from compressor head to tank. There should be a brass/steel checkvalve at the tank. The checkvalve allows air to enter tank, however not allow air to be released back into discharge hose. If this valve is leaking, air will be released from the unloader constantly. Follow 1/4" tubing from checkvalve to unloader and listen for leaks. Repair as needed. If air is not leaking from checkvalve then check unloader mechanism with-in pressure switch. Parts are available at www.toolpartsdirect.com Good luck

Aug 25, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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

Mar 18, 2010 | Coleman Powermate 27 Gallon Air Compressor

1 Answer

Compressor wont restart because of head pressure


Piston air compressors have to unload to permit a restart, the two mot common types are an unloader valve or free air unloaders.

with an unloader valve this system uses a check valve mounted in the discharge line as it enters the tank, when the pump stops this check closes and does not permit the tank pressure to return to the pump. a unloader valve also opens to allow air pressure in the discharge line to vent, this valve is either on the pressure switch or on some models is on the pump, and is a centrifugal type.

Free air unloaders or head unloaders are a set of fingers that hold open the intake valves on the cylinders to permit the piston not to pump air against a head load, and once the pump is running the fingers retract to allow the pump to function as normal.

Jan 19, 2010 | Air Tools & Compressors

1 Answer

Compressor fly wheel not hung up unit starts operation soon fly wheel starts to slow down like it is laboring then stops and motor overloads and trips protection switch


It sounds like the unloader valve it not working correctly. The unloader valve bleeds off the pressure between the pump head and the tank check valve. Without it every time the compressor starts the piston would be working against the max tank pressure. This would cause what your describing. However when the unloader valve is not working the pump will shut off with in a couple seconds. If your pump is working longer then that I would guess that the unloader valve may be bleeding off some but not all the pressure.

On most smaller craftsman compressors the unloader valve is comprised of a piece of tubing running from the cylinder head or the check valve to the switch. At the switch you will see a plastic tip with a pin running to a small trip lever. Make sure that it's moving freely and moving through it's full range of motion. It's impossible to describe how this looks and feels to someone who has never messed with one of these.
After you have checked it and made sure it's working, if you still has trouble after this please let me know.

Oct 15, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Compressor stops then leaks down to low setting


That little copper line is an unloading line, to bleed compressed air out of the compressor head so that the motor can more easily start the compressor. Pressor switch should be threadded into top of air tank, and the unloading valve is built into the side of the switch. When the tank reaches the high pressure setting the switch disconnects power to the motor and opens the unloading valve at the same time. The unloading valve should be connected to the compressor discharge line through a check valve with an unloading valve port upstream of the check valve. These valves are usually threaded into the top of the air tank as well. Sounds to me like your valve was leaking and someone bypassed it.

Sep 14, 2009 | Ingersoll Rand - Rand - Ir 2545K10FP Type...

1 Answer

Dayton air compressor to much head pressure to restart


Head pressure is caused by a malfunction of the unloader valve at the pressure switch or leaking checkvalve at the tank. Follow the discharge hose from the head to the brass valve at the tank. The brass checkvalve allows compressed air into the tank and not return to pump. Also connected at the checkvalve is the 1/4 airline to the pressure unloader at the pressure switch. This unloader releases the air in the discharge hose when the cycle completes. Look/listen for a release of air which lasts only for a moment after cycle at the pressure switch. Some pressure switch unloaders look like a tire stem valve with a small mechanical arm to activate pin. To check for faulty check valve at the tank, with air in tank remove the 1/4 line at the checkvalve and l look for leak. If leaking replace valve. Check valves and pressure switches are available at www.grainger.com. You can use generic parts instead of factory to save money, just pay attention to thread sizes. Good luck with you repair and email if you have questions.

Apr 02, 2009 | Campbell Hausfeld Air Tools & Compressors

2 Answers

Unloader valves


Yes, your compressor will work just fine with a Load Genie continuous run unloader from www.grainger.com. The part number is 4tk14 with a cost of about 45.00. This unloader has a built in check valve so you can remove the present in-tank checkvalve and save it for later use. All that you need to do is install the unloader at the tank and compressed air in to top of valve. (you may have to buy extra fittings to make it work with your tubing size) Adjust valve to open just before the pressure switch cut-off setting. The unloader will bypass the compressed air and will have less stress on the motor. You will not need to use the present unloader at the pressure switch. The only caution is to manually unload the Load Genie upon initial start if there is pressure in the line. Good Luck with your project.

Mar 31, 2009 | Northstar Electric Stationary Air...

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