Question about Craftsman 3 gal. Air Compressor, 1.5 hp, Horizontal k

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Was working normal suddenly will not build pressure

Compressor was working normal for 18 months but suddenly it will no longer build up tank pressure beyond 35 psi. Pressure build up is also slower than normal as if there is a large air leak but there are no apparant air leaks or loose connections. Motor sounds the same. Checked the cylinder head bolts and air tube connections, removed and refitted the Check Valve. Pressure Relief Valve isn't leaking. Tank Safety Valve isn't leaking. Oil is over half height on the sight glass. Regulator is wound fully in (makes no difference where else it is) and regulator pressure gauge is reading = to tank pressure. Tank drain valve is closed. Air Filter is clean. Disconnected the accessory air hose to eliminate it from the trouble shooting. Have removed (and reconnected) the Pump outlet tube and can feel air delivery but don't know if this is high or low compared to previously. It's as though the Pump can't deliver. Are Pumps a weak point?

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Maurader1 an apprentice has this problem solved and is spot on. All these gurus and wiz need to stick to the basic and common sense. The first place your pump will give out after use or abuse is the gasket. All this garbage about defective reeds and defective pressure switch is a lot of nonesense if you first don't rule out the most common problem the head gasket. I'm cheap and this thing has paid for itself 10 time over. You can get a gasket kit for $7, but I fabricated a gasket out of the back of my notebook and sprayed some gasket spray and been working like a charm ever since.

Posted on Jan 04, 2010

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Pull head check ig gasket is split we buy these in salvage loads and brand new the gasket is split and losing pressure no build up beyond 35 lbs this is what we find 9 out of ten times good luck

Posted on Sep 30, 2009

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Did you ever figure out what the problem was with your compressor? I have the same model compressor and the same pressue issue although mine will make it upto 60PSI and stop. No obvious problems. Any help would greatly be appreciated.
Thanks

Posted on Oct 01, 2009

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So if you have done so many steps of investication,please do one last thing before going to cylinder head,see if the hole of the suction port is not blocked by defective air filter sponge.if problem is internal,which means,perhaps the cylinder head is damaged,or the valves in the valve plate is damaged.so remove the six bolts of the cylinder head,check all internal parts and you will get the solution.

Posted on Sep 28, 2009

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1 Answer

I have 2month old a paasche d500sr air compressor suddenly wont build up any airpressure


there can be several reasons - but first check connectors if there is lose connection and therefore loss of air and pressure.

if there is no pressure at all from outlet:

1. switch on the compressor
2. open drain valve and check for airflow (this is this small nut on the bottom of clear bit),

if there is airflow:
1. close drain valve
2. remove air hose from outlet and check for airflow
3. lift regulator valve and screw it back to minimum (anticlockwise), value on the gauge should be 0 (zero)
3. lift regulator valve and now open it (turn clockwise) in full, check for airflow,

if there is no flow, now, that suggest regulator assembly is at fault, to confirm:

1. switch off the compressor
2. remove drain and regulator assembly (you will be left with hole directly above membrane)
3. switch on compressor - check for airflow, if there is no airflow now (without regulator assembly), it meant that valve is gone

as in both cases (valve and regulator assembly) compressor is still under warranty, return to the point of purchase and they will either repair or replace the unit, if you desperately need to airbrush - just pump tractor or other tyre insert with "normal" compressor and then use this air to pressurise your airbrush.
http://www.paascheairbrush.com/index.html

more about tire pressure - check in my other answers pertaining to airbrushing.

hope this short info will help you solve your problem, do not forget to vote

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1 Answer

Pump not holding presure


If you have a bladder - type water pressure tank, it probably needs to be purged of air and then pre-charged to 18 psi. There may be directions on the side of the tank. Turn the water Pump off. Drain the tank of water. Check the pressure of the tank at the air valve on top of the tank. The pre-charged pressure of the bladder is set to 2 psi below the lower pressure set by the pressure switch, so in your case, the low end pressure is 20 psi. Therefore, the pre-charge pressure of the tank is 18 psi. If you set the pressure switch to operate at 30 -50 psi, then the pre-charge pressure would be 28psi., etc. Once the pre-charge pressure is set, turn the pump back on. ( don't forget to close the drain valve). The system should cycle normally. A tire gauge works to check the tank pressure. An air compressor may be used to charge the tank, but be careful not to over- inflate the bladder. A tire air pump may also be used. Hope this helps....

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1 Answer

My dewalt D55146 makes loud leaf blower noise, has a burning smell and doesnt build pressure


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

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2 Answers

When I start my Job boss air compressor model#cffr350b It builds pressure to set psi and stops. Then after using any air gun for a while the pressure drops and the motor kicks in and struggle and will pop...


Whats happening is the compressor is trying to start with pressure on the head/ compressor. The motor is not strong enough to over come the pressure so the motor tries to run ,may be hum a little and pops the breaker. When you bleed the pressure in the tank down the motor does not have to over come the pressure and starts up as it normally would. Now, your problem is the check valve between the tank and compressor. It needs to be replaced. It is allowing pressure in the tank back to the compressor. Thus the compressor tries to start and can't. Trace the line from the compressor to the tank. You should find the check valve screwed into the tank and the compressor discharge line screwed into the check valve. Remove the compressor discharge line,then remove the check valve. Assemble in reverse . also you can loosen the fitting at the compressor. if it blows air all the time it's the check valve for sure.

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1 Answer

My compressor runs and builds pressure but, with nothing touched all of a sudden does not produce the same amount of pressure as before, it will not run my printing machine. What should I check?


Does the compressor have enough CFM to run the printing machine. Will the compressor build up pressure and shut off if you close the discharge valve at the tank. Your printing machine may simply be using to much air. If the above items are not the case you may have a faulty check valve in the receiver tank or valves going bad in the LP or HP heads. The valves may also simply have carbon build up or dirt of some type not allowing the valves to seat properly. I would start at the check valve. One way to check the check valve is to see if you have air blowing from the bleed off line at the pressure switch all the time. Another way to check is loosen the fitting at the High Pressure head an see if you have air blowing continously. Caution do not remove the fitting at the head completely. If the check valve is bad you will have high pressure air blowing until the receiver tank is drained.

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1 Answer

My Bostich CAP60P compressor will build pressure to about 40 pounds (tank pressure), and then keep running but not build more pressure or build it very slowly. No leaks.


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