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I have a compressor that wont go over 50 psi, I pulled the head and cylinder and the rings are good and so is the cylinder. The plate valves in the head look great but I got one of my cigars out and watched the smoke being pulled into the intake until it got to around 50 psi and then it started blowing it away from the intake. Could this be the check valve on the tank?

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HAVE YOU CHECKED TO RESET

Posted on Dec 05, 2012

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I own a Campbell Hausfeld model WL650800AJ compressor, the problem is that the compressor will not pressurize over about 85 psi..where would be the best place to start troubleshooting?..BTW, there is


The usual problem with oil-less type compressor is the Teflon compression ring and cylinder will fail causing the problem that you describe. Easy to check. With cover removed, turn the pump until the piston is all the way up. With good light, check the condition of the cylinder near the top. If the cylinder looks scratched, air is leaking past cylinder and ring and pressure will not build up enough to reach cut-out. If cylinder looks smooth, then problem is head valve reeds or head gaskets. Indication of bad reeds or head gasket blown, is extremely hot head during fill cycle. Good luck

Dec 07, 2014 | Campbell Hausfeld Air Tools & Compressors

1 Answer

Dewalt emglow 2gal compressor will not reach cut out pressure


This usually means you have a problem with the piston & cylinder assembly or with the valve plate. If the piston ring or cylinder is damaged, it will compress some air but as the tank pressure rises more and more air will leak past the piston. If the reed valves on the valve plate are bent, warped or broken the same will happen. It's easy to check them for damage by removing the head but Emglow parts are getting harder and harder to find.

Apr 26, 2012 | Air Tools & Compressors

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My kobalt air compressor starts and builds pressure to around 50 psi then will not build any higher the air is being drawn in on one cylinder intake and the other is venting air.Does this mean the heads...


Hi,
It could be a valve/head problem, but it could also be a cylinder/ring problem...to find out it will need to be disassembled...that is not hard... getting parts to reassemble can be the hard part...

heatman101

Sep 07, 2011 | Air Tools & Compressors

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Will not build up air perssure over 50 psi. and the motor will run all the time until I shut it off.


The motor will run until the pressure switch detects approximately 150psi in the tank. If it never gets to 150psi, it will continue to run. If you are not getting over 50psi in the tank check:
1. that the drain valve on bottom of the tank is fully closed. Don't use a wrench on it but it must be tightly closed by hand.
2. that you don't have any air leaks on the top end of the compressor or on your lines going out of the tank.
If these are OK, your problem lies either in a damaged valve plate or cylinder/piston. You can remove the head and check the condition of both the cylinders and the valve plate. All reeds on the valve plate have to be in good condition with no bends, cracks or warpage from over heating or debris from using the compressor with no air filter. The cylinders should be smooth with no scaring. If a cylinder is damaged you will have to also replace the rings or piston assembly. None of the air compressor companies make an oversized ring set so you can lightly hone cylinders but you cannot have them bored out oversized to correct any damage to the cylinder walls.

Mar 31, 2011 | Porter Cable Cable 135 PSI, 60 Gal. Oil -...

2 Answers

My model CAP 60p-OF runs up to 80PSI then won't shut off, and can't get past 80 PSI. All they would tell me at the customer service was to take to a repair center. SInce that involves a $20 fairy ride and...


If your compressor is still under warranty it may be worth the trip, anything you do to it will stop/void your warranty. That being said, your compressor won't shut off until the pressure switch sees 130 to 150 psi in the tank. A couple problems will lead to what is happening to your compressor. First check your valve plate assembly, it's right under the head. All of the reed valves must be in perfect condition, no cracks, chips or warpage and laying completely flat against their respective holes. Basically the the bigger the leak around the valves, the less pressure that can build up in your tank. If you are getting 80 psi you're looking for a very small leak. If the valve plate is OK check your piston and cylinder. The cylinder should be very smooth and the ring on the piston must be tight and facing up all around the piston. They are bad for a small section turning downward and letting air leak out. Just like the valves the smaller the leak past the piston, the more pressure you'll get so look for any imperfection in the cylinder or piston ring. A fairly good place to find parts is www.ereplacementparts.com. You can get a good breakdown of your compressor and order parts from them.

Jan 27, 2011 | Stanley NEW Bostitch 2 HP 6 Gallon...

1 Answer

Will not build pressure past 40 psi


You have either damaged reed valves or piston ring. Both of which are common problems with this type of compressor. To diagnose: Remove the motor cover, then the four screws holding the cylinder head on. The valve plate is under the head and all eight reeds, five intake and three output, must be in very good condition to work properly. You'll need the valve plate, part number N017592, and head gasket, part number Z-D24819, if there are any damaged reed valves. If they're OK, check the piston ring. Remove the screw holding the piston on the flywheel and pull the con-rod out of the cylinder. The ring around the piston must be in perfect condition to build pressure. The connecting rod kit, part number KK-4964, is the only way to get the piston seal ring.

Jan 17, 2011 | Porter Cable C2002 150 Psi 6 Gal...

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I have a ch 28 gal (wl611700aj) air compressor,it pumps up to 80 psi.wont pump up any further but does keep running.whats your thoughts?


Here are a couple of things to check. While the compressor is running spray soapy water on all airlines, fittings, bottom of pressure switch, regulator and drain valve to make sure that they are not leaking. A small leak will prevent the unit from reaching cutout limit. Repair as needed. Next unplug compressor and remove cover to expose cylinder and piston. Move piston to top of cylinder and check for scratches or wear neer top of cylinder. If scratched, air is bypassing piston ring and will not reach cutout pressure. If cylinder looks good and no leaks then problem most likely is valve plate/ reed valves or head gasket. Problems within head will cause low pressure and air line to tank will be very hot. Bad reed valves will also cause air to blow out of intake when it reaches 75 to 80 psi. Parts are available at www.chpower.com or at www.toolpartsdirect.com. Good luck

Sep 11, 2010 | Campbell Hausfeld 26 - Gallon Air...

1 Answer

Drops compressiom from 120-60 psi after 3 new pressure switches


When the pressure switch fails the comperssor will overpressure to the point of safety release at about 150 - 160 psi. It sounds as if your compressor is not producing enough pressure to cycle off at 120 and just keeps running. This happens when air is leaking from fittings or worn cylinder / reed valves. Don't worry, with some simple tests we will find the actual problem. I am assuming that your compressor is oilfree type. If there are leaks the compressor may not reach set pressure. I use soapy water on all connections and on the head/headvalve (remove plastic covers to get to all parts that may leak) while compressor is running. Make repairs as necessary. If still low pressure, while compressor is running and has reached max obtainable pressure (in your case 60 lbs), carefully place finger over intake port hole (remove filter). If the compressor is pumping normally but leaking there will be ample suction at intake and cause the compressor to speed-up when intake is obstructed with finger. If you feel plenty of suction and no visible (soapy water) leaks, then the problem is probably the cylinder /ring is not correctly seating /scratched and air is leaking past cylinder. Make sure that the cylinder /piston ring is properly aligned and that the lip on the vinyl ring is up toward the head. On oilfree compressors you can examine the cylinder by pushing the piston all the way up, then look for scratches neer top of cylinder. If scratched, pressure is leaking past cylinder, install cylinder kit. If you do not feel suction but rather air blowing out of the intake, (do this test when tank has reached 60 psi) then the problem is the headvalve plate/reed valves are leaking. The reeds must seal perfectly on their seats and not be bent or have obstruction. Replace as necessary. If reeds or headgasket is leaking the discharge air will be very hot. Only one other thing to check and that is the intank check valve. Easy to check. Run compressor till you have about 50+ lbs in the tank then unplug compressor. Carefully loosen the inlet hose at checkvalve and listen for air leaking out of tank. (check valve is the brass valve at tank) If leaking replace checkvalve. Use caution when removing head to try and save the gaskets. If you have oil type pump, and no air leaks (soapy water test) suspect reed valves/valve plate. Good luck on your repair and email if you have other question.

May 06, 2009 | Campbell Hausfeld 28 - Gallon Air...

1 Answer

Air compressor not filling tank


Most compressors with the problem that you are having suffer from leaking valves. As in a gasoline engine, leaking valves will lower efficiency. Valves in a compressor are in the form of reeds that seal against valve plate. Leaking reed valves or gaskets will increase the discharge air temperture. Inspect these parts with a magnifying lense. Look for evidense of wear or leaks. Also look for signs of air leaking from one cylinder to the other thru gaskets. Replace valve plate as necessary. Simple test, as your compressor is filling, check the intake for strong suction; as it neers the 92 psi mark suction will probably deminish if you have leaking valves. If suction remains strong at 92psi then you have a leak at the discharge side. Check with soapy water on all parts. Good luck

Jan 19, 2009 | Air Tools & Compressors

1 Answer

Craftsman 5 hp 30 Gal Won't build to more than 50/60 PSi


Most oilless compressors suffer from a short lifespan of the cylinder and piston ring. Unplug the unit and remove the cover to expose the cylinder and rod. Move piston to topmost position and examine the condition of the cylinder. If you see scratches or worn areas close to the top of the cyl. then most likely will need rebuild kit. (Not expensive) If cylinder looks good, remove the head and check the reed valves for debris or broken reed. Reed valve plate is also available as part with gaskets. To extend the life of an oilless compressor try not to use it in dusty or sandy areas as the bottom of the unit is open and tends to **** dirt into cylinder. Good Luck.

Dec 31, 2008 | Craftsman Air Tools & Compressors

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