A Husky compressor is rated to build up to 175 PSI in the tank before it shuts itself off, but now the Husky compressor will only build 10 PSI of air and then stops. What’s causing this?
Husky compressors are the “house brand” of the Home Depot chain of home improvement stores, and are available in a variety of sizes, motor HP’s, tank sizes etc.
Since I don’t know the specific model number of the Husky in question, I’ll have to guess that it’s an electrically driven air compressor, with a mid-size tank, and a single cylinder compressor pump like the one in the image above. With this criteria we can figure out what’s causing the problem with a Husky that only generates 10 PSI of air then stops, and the same issues may be at fault if you, too, have a compressor that is stopping at a pressure other than the normal cut out setting of that brand.
The first thing to consider is how is the Husky compressor stopping at 10 PSI? Is the air compressor shutting off? Is the Husky still running but the air build stops at 10 PSI (or whatever pressure your brand of compressor stops building air at?).
Husky air compressor stopping – shutting down – at 10 PSI
Let’s look at the scenario that the compressor is stopping… it shuts off… at 10 PSI.
One cause of the compressor shutting down at 10 PSI is the pressure switch itself. Has the pressure switch tripped to non-passing, which means there is no power flowing through it, when the compressor reached 10 PSI in the tank?
To check that you’ll need a voltmeter of some sort. Pull the cover from the switch and check the terminals on the motor side. If there is no power there, and there is power on the supply side of the switch, then the switch is likely the issue.
They can be fixed, there are pages on this site about folks that have done so, but for this person the aggro of trying to find parts and figuring out how to rebuild a pressure switch makes that a poor option, and I’ll simply acquire a new one.
Another cause of the Husky shutting off at 10 PSI could be electrical.
If the Husky compressor is stopping at 10 PSI and only run a short time before the shut down the pump or the motor cannot have had time to build much heat. Is the motor unusually hot given that it cannot have run for long?
If so, that points to the power supply as possibly being the issue. Has the Husky compressor been moved to another location? Is an extension cord being used to power the compressor? If so, remove the extension cord (use a longer air hose instead) and relocate the compressor to the outlet where it worked properly. Did that resolve it?
If it’s the same location and an extension cord is not being used, then the power supply problem is quite possible the motor capacitor. I won’t get into details here about what they are or how to check them as the pages on this site that discuss this are easily accessed using the sitemap page or the search box.
You will need to be sure that the capacitor is not the problem.
Compressor doesn’t stop running but stops building air at 10 PSI
This scenario has nothing to do with the power or power supply to the Husky compressor, but most likely has to do with a problem with the compressor pump.
If the piston seal is worn, the piston can cycle up and down or back and forth, and air simply passes the seal once the back pressure reaches 10 PSI. That means a new piston seal is required.
One symptom of a worn piston seal is that air can sometimes be felt blowing up the oil fill tube and out the oil fill vent when the compressor is running. If this is the scenario on the compressor, bet on the piston seal as being all or part of the problem why air pressure in the tank only gets to 10 PSI and no higher.
Another common pump problem when it no longer builds pressure is that the pump flapper valves have failed, either the low pressure or the high pressure valve.
If the low pressure flapper valve has failed, that’s the intake valve, and air often can be felt blowing back out of the intake port when the compressor is running.
If the high pressure valve has failed, air may still be drawn into the pump but once the tank pressure reaches 10 PSI in this case, if the high pressure flapper doesn’t seal properly, and instead of air being blown into the tank to increase pressure, it goes virtually no where. That’s a bit harder to diagnose.
Compressor pump gasket issue?
Another problem that occurs in pumps is the gasket that isolates the low pressure side of the pump head from the high pressure side works OK until the back pressure reaches the 10 PSI, and then it is no longer strong enough to keep the higher pressure air on the high pressure side of the pump, a hole is blown open in the gasket, and air flows back and forth between the two sides of the pump, with only 10 PSI worth going into the tank.
If the Husky compressor is experiencing any of the above, it’s time to tear down the pump, and certainly replace the flapper valves and gasket(s), and if long use and wear are the reasons why the problem occurs in the first place, it’s probably time to replace the piston seal too.
Good luck, and let us know if this page helped with your Husky compressor, won’t you?