Question about Porter Cable 4 5 Gallons 150PSI Job Boss Oil Lube Mobile Air Compressor ? C3551
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Posted on Jan 02, 2017
Your compressor is sold under various part #s depending on brand name. The link below is the breakdown for ac-0171.
http://www.devilbissparts.com/OilLubeStat%20PDF%20files/ac-0171.pdf. You will notice that there is no vent to release internal pressure. Most brands have a filler/dipstick which is also a vent. As the compressor wears there is a normal increase in crank pressure caused by pressure passing thru the rings. I have seen home made vents installed on the bearing cap. If you are creative you can make one yourself using the same cap or a metal cap (axel bearing cap) that fits the opening. A crankcase vent is a very simple device. A small hole to atmosphere with a bit of oil resistant foam behind to prevent oil from being blown out the hole. Works best when there is a vent tube about a couple of inches long to catch any oil and allowing it to run back down into crank. Remember that there is oil sloshing around inside the pump. Examine several brands of compressors for vent and try to recreate that on yours. One thing in common about vents is that they are usually located pretty high up above the crankshaft. You could also try lowering the cut-out pressure on your compressor to reduce back pressure. Good Luck on your repair.
Posted on Apr 23, 2009
tap on the check valve with a metal object. Its sticking open. The check valve is the brass fitting on top of the tank. When the valve sticks open it emits air from the area of the engine. If that doesn't work (which I would be surprised it doesn't), you'll need to purchase a new check valve. Good Luck!
Posted on Jul 02, 2009
Might be the unloader valve is stuck. if so there will be hissing noise from switch assembly and you may have to get a new one.
Posted on Jun 06, 2010
SOURCE: My porter cable air compressor
The airr pressure cut off switch is not working or out of alignment. What you can do is to adjust the spring with the air pressure reading at your required pressure. Once this is done allow the air to flow so that the compressor will work again to cur off, you will have to trim once again to set it to the correct condition. If the spring assembly is not working well on pressure you can remove and reset. If the contact are dirty , the switch on may not start the compressor, in such case clean the contacts. But if you think that it is not acting responsive, the please replace the unit and do the settting as explained above.
I hope you try this out. Good day
Posted on Aug 16, 2010
According to Porter-Cable (Delta) themselves, they had lots of bad regulators on these compressors. I'm waiting for one myself. Same issue
Posted on Dec 20, 2010
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