Question about Ingersoll Air Tools & Compressors
The first thing we checked was the check valve at the tank. It was bad so we replaced it. Then we found that the line from the high comp. cylinder to the tank was staying pressurized upon shut-down. The low compression cylinder can be heard bleeding off through the pressure switch. We put a pin hole in the small plug on the side of the check valve at the tank and that bleeds off that line as shut down. It will struggle for 4 or 5 seconds on start-up, trying to get up to running speed but always kicks the breaker or re-set before it gets up to running speed (3600 RPM). The only way it will start up and get up to running speed without kicking the breaker or re-set is if I let all the air out of the tank. I don't know if this unit has a starting overload feature. It is serial number 30T 790498.
It sounds like the pressure switch needs replacing as this unloads the machine from the check valve up to the heads if pressure present when trying to restart it will cause it to trip when machine stops should get air leaking from under pressure switch for 1-2 seconds then it will stop
Posted on Oct 16, 2014
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Posted on Jan 02, 2017
That little copper line is an unloading line, to bleed compressed air out of the compressor head so that the motor can more easily start the compressor. Pressor switch should be threadded into top of air tank, and the unloading valve is built into the side of the switch. When the tank reaches the high pressure setting the switch disconnects power to the motor and opens the unloading valve at the same time. The unloading valve should be connected to the compressor discharge line through a check valve with an unloading valve port upstream of the check valve. These valves are usually threaded into the top of the air tank as well. Sounds to me like your valve was leaking and someone bypassed it.
Posted on Sep 14, 2009
bleeder valve is bad or dirty drain air unplug machine pull the back up plate control plate and make it shinny with emmeory cloth then clen it and try again, if it still does the same thing your going to nedd to replace unloader valve.
Posted on Apr 14, 2010
If the unloader is not working properly the motor cannot overcome the head pressure. Two things to check. Make sure tank check valve is not leaking. Easy test. With pressure in tank, unplug the compressor from outlet and remove discharge hose at tank and listen for leak or spray soapy water. If leaking replace valve or try to clean debris from valve seat. If not leaking then problem is most likely at pressure switch unloader valve. Follow 1/4 inch hose from checkvalve at tank to connection at pressure switch. When pressure switch reaches cutoff pressure the switch opens the contacts and moves small tang against valve stem to release air from discharge hose. Check for proper function and repair as needed. Good luck.
Posted on Aug 19, 2010
SOURCE: I have an Ingersoll Rand
When the compressor comes up to pressure and kicks off, you should normally hear a gasp of air escaping. That gasp is the release of pressure from the compressor itself - not the tank, and it is supposed to get released so that the compressor can restart without being preloaded with compressed air. My guess is that the gasp is not happening. It is probably some debris or a gummy mechanism. The mechanism is supposed to be triggered by the same mechanism that shuts off the motor.
Posted on Aug 30, 2010
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