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I have a air compressor pump, I need new flapper valves, for it. it is not a air nailer! ! ! It is a 140 psi Ywin Cylinder air compressor pump for 5hp motor.

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At times at our repair shop, we are unable to obtain exact replacement parts such as your flapper valves / reed valves so we improvise and use feeler gauge material. Feeler gauge material makes excellant reed valves. It can be cut or shaped into the exact size that you need and is available in various thickness. If however, you know the model number of your unit, a good source for parts is www.toolpartsdirect.com or www.mastertoolrepair.com Good luck with your repair.

Posted on Apr 04, 2011

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Makita MAC5200.Brand new.Just broke-in. Pressure goes to 140 PSI and stops.Tries restart at 110 PSI.Motor"Humms"only.Will not restart until pressure below 20PSI.


http://www.toolpartsdirect.com/makita-mac5200-3-0-hp-air-compressor.html
There is a part called an unloader. It reduces the pressure on the compressor when the unit stops at the desired pressure. The actual unloader may be part of number 50 in this diagram.

Dec 18, 2016 | Makita Air Tools & Compressors

1 Answer

Air compressor does not shut off at 150 psi


If its new take it back. If its used,, the pressure regulator is not working. Make sure the pop off valve is working, safety first.

Oct 10, 2013 | Dewalt Heavy Duty 2 Brad Nailer Compressor...

1 Answer

I have a Stanley Bostitch Oil Free Air Compressor 6.0 Gal 2.0 Hp Peak, 1.5 Hp Running 135 Psi The problem is it won't blow out air or hold the air.. How can I fix this?


Some Bostitch compessors are very unique in that they intake air from below the piston. If you cannot find an air filter, then your compessor has reed valve built into the piston that may cause problems. If you have an air filter on the head of the pump, then you have reed valves in the head. When the reed valves fail, there will be very little or no air pressure. Second problem with all compressors is the in-tank check valve. This valve allows air to enter the tank and not back-out into the compressor. Easy to check. Add air into tank with another compressor thru the quick connect and listen for air leaking around the head or pressure switch. If no leaks and pressure holds in the tank then valve ok. Examine the condition of the cylinder and piston ring by rotating the crank by hand so that the piston is at top of cylinder. Look for scratches around upper part of cylinder wall. If scratches, then replace cylinder and piston ring. If top of cylinder looks good, then suspect reed valves. Good luck

Sep 12, 2011 | Stanley Bostitch 2hp 6gal Air Compressor...

2 Answers

Dewalt D55168 air compressor runs until 95 psi and never stops. Pressure never goes above 95 psi. It use to stop around 140 psi.


Check for leaks all over the machine. Possibly the O ring on the drain valve is damaged. If the machine is oil-less, the big rubber O ring on the piston could be worn away.
When the machine is turned off can you hear air leaking from anywhere?

Mar 31, 2011 | Dewalt D55168 1.8 HP Wheeled Portable...

1 Answer

1 hp 3gal craftsman compressor will only build up to 20lbs pressure in tank. how much compression should single cyl have on compression stroke?


A piston in any engine should be around 100 psi I would guess. A Chevy 350 used to be around 150 psi. An air compressor that only pumps enough air to reach 20psi is obviously too low on compression. Nailers and the like need 80 or more psi. The intake valves may be shot, the unloader might be stuck or piston rings are worn.

Dec 08, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

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

Motor "bogs down" at roughly 120 psi...almost stops


You suspect this unit as being a two stage because of the unusually high cut off pressure. It is a single stage and the motor really has a difficult task and is being pushed to the limits. to reach this pressure. We usually reset the pressure to lower setting ~~ say around 140. Your pump probably has a leaking intank check valve (brass fitting at tank) or leaking valve plate in pump. Simple tests : with pressure in tank unplug compressor from outlet and listens for air leak around pressure switch. As you unplug the running compressor from outlet you should hear air leaking from pressure switch for just a moment as air is let out of airline from pump to tank. If air leaks out till zero pressure then change the valve. If tank holds pressure then valve probably ok. Next test, with no air in tank and air filter removed, plug in compressor and feel intake port for strong suction. If the valve plate is bad, suction will decrease as pressure neers the 120 mark till the point of feeling that air is actually blowing out of intake. With good valve plate there will be strong suction untill unit reaches set pressure. If valve plate is bad also change the cylinder and piston ring. Good luck with your repair.

Jul 28, 2010 | Dewalt 2 Hp 4 GAL Air Compressor

1 Answer

Compressor blows off, does not maintain pressure


Hi there. This is normal. The pressure is set to stop at around 120-140 PSI as a safety measure. It probably kicks in again around 80 PSI so as to remain pressurized between 80 and 140 PSI. Since most air tools operate in this range, it is ok for the compressor to maintain pressure in that range. You do not want to adjust the maximum pressure safety release valve as it could be extremely dangerous as certain components in the compressor may only be rated up to 140 PSI or slightly higher before they fail or blow apart.

Jul 25, 2009 | Porter Cable 18 - Gauge Brad Nailer and...

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

Nail Gun how to


One of the factors used to designate compressor power is motor horsepower. However, this isn't the best indicator. You really need to know the amount of air the compressor can deliver at a specific pressure. The rate at which a compressor can deliver a volume of air is noted in cubic feet per minute (cfm). Because atmospheric pressure plays a role in how fast air moves into the cylinder, cfm will vary with atmospheric pressure. It also varies with the temperature and humidity of the air. To set an even playing field, makers calculate standard cubic feet per minute (scfm) as cfm at sea level with 68 degrees F air at 36% relative humidity. Scfm ratings are given at a specific pressure–3.0 scfm at 90 psi, for example. If you reduce pressure, scfm goes up, and vice versa. You also may run across a rating called displacement cfm. This figure is the product of cylinder displacement and motor rpm. In comparison with scfm, it provides an index of compressor pump efficiency. The cfm and psi ratings are important because they indicate the tools that a particular compressor can drive. When choosing a compressor, make sure it can supply the amount of air and the pressure that your tools need.

Sep 01, 2008 | Dewalt Heavy Duty 2 Brad Nailer Compressor...

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