Speed variance as PSI builds
by Steve Orin
(St. Cloud, FL)
2 year old 31/2 horse upright Husky, 60 gal. tank. Running speed varies once above 90psi, from a near stall to normal speeds.
No power fluntuations & unit connected directly to dedicated hardwire.
Oil & air filter good - serviced regularly. Unit's in clean environment.
Could Check valve be cause or would speed slow steadily as pump tries to overcome tank PSI? This is second compressor with like problem in 4 years.
Steve, sure, it could be the check valve, and it's always a good idea to pull it and clean it to be sure. Make sure you dump all the air first, of course.
The compressor motor will see increasing load as the air pressure in the tank increases. In most cases, any change in speed is hard to notice, as the compressor is built to handle those load increases.
Your compressor speed fluctuation bothers me. If there were a consistent problem, the motor would lug, and then lug worse, as the load increases.
Another possible issue could be the run capacitor reacting somehow.
It seems clear that the compressor is reacting to changing load conditions, it is just that it should react the same way every time.
The wiring may be hard to the compressor, but what, if anything, is also pulling power from that same circuit that the air compressor is on?
Husky 60 gallon slow building pressure
My husky 60 gallon is having a hard time building pressure! Takes along time to build 90-135 psi! They want $280 for a new pump I'm just not sure that's the problem... Filters alittle dirty but even with it removed it acts like its getting too much air. There is no funny noises, doesn't use oil. Where can I look to find anything else wrong besides buying a universal pump.. 2.5 years old and only 2 yr warranty!!! Go figure.
A bunch of things to consider.
Make sure the power supply hasn't changed, the belt is at the right tension, you have checked the intake filter, but is there air puffing back out of the intake valve?
Feel under the unloader valve to make sure no air is bleeding out there while the compressor is running.
Pop over to the Troubleshooting section on the site map page, and follow the links to more info about why air compressors run but don't build pressure.