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My Model 91915294 5hp 25gal Craftsman sir compressor is not fulling the tank. it get to about 40 lbs & stops. Doesn't seem to be leaking & the motor is run. because of this it will not shut off
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Parts ordering: http://www.searspartsdirect.com/partsdirect/part-model/Craftsman-Parts/Air-compressor-Parts/Model-919167450/0247/0703000/P0040151/00001?blt=06&prst=&shdMod=
Hi, my name is John. Welcome to FixYa. You have air leaks. Check all lines, pressure switch, line coming from pump to tank. You may have to remove this one to inspect it. Check valve at the bottom of tank. Thanks for choosing FixYa....John
If the pump is putting out 40 lbs then it is working these things are loud there must be air leaking out some where are you sure that the petcok on the bottom of the tank is closed or the blow out valve is not leaking or mabey I would say the gauge but it dosn;t shut off If the pump is putting air in that tank it eigther compresses or it comes out run your hands all around the mechine when its running there must be a leak
Leaking in-tank check valve will cause air to continually leak out of unloader valve at pressure switch. Remove brass/steel fitting at tank and check seat for debris or replace as needed. You can use generic valve just watch fitting sizes. Available at www.grainger.com. Good luck
Maybe your unloader valve is stuck or damaged. This is found in the switch assembly and if it is faulty you should be able to hear a constant hissing noise from the switch .
The only thing I can think it might be is something else is running on that breaker. But for it to snap a 30 amp, whoa. The 5.5 hp motor probably draws 18 amps on start up if not more. But then runs on 12 or 13, so for it to snap a 30 amp, I don't know. The capacitors, you have 2, could be drawing too much. One thing, what is the 30 amp breaker for? Is it 220 volts? Is your comp 220 volts? Check this stuff out. I'm not sure how you test the capacitor, but don't go messing with it, it holds a charge. Hope this helps.
The compressor will not auto shut off until it reaches the preset pressure which is usually around 100-130 psi - your problem is leakage of air from the oil filler cap suggesting that you have a failed internal valve.
This problem is not uncommon with small compressors and the inexpensive plastic regulators they use nowadays. The one surefire way to stop it is ti install in in-line valve before the regulator outlet, even if it involves the double ended & threaded brass soupler so they both fit on. This way you can just turn the handles across the line effectively shutting off air flow. I have two pancake compressors and ended up doing the very thing.
Then when time comes to hook up a hose and tool, just switch the handle back and you have air.
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