Kobalt 1.6HP compressor will not run
Compressor was dropped before it was ever turned on an one of the cylinder heads broke off.
I have a Kobalt 1.6HP 30 gallon compressor with a twin head pump.
I ordered a new cylinder, gaskets, and rings.
After replacing the cylinder, gaskets, and rings the compressor would not start. The motor hummed but didn't seem to have enough umph to turn the pump.
I followed many of the suggestions on this sight including checking the start and run capacitors.
I then plugged the compressor into a dedicated 20 amp 120 circuit with the same result.
I then removed the drive belt. The motor starts without any issues when under no load.
I know very little about compressors.
I tried hand turning the pump pulley by hand. It is very hard to turn.
I removed both heads and it still was hard to turn.
I removed the cylinder I had just replaced and it seemed to turn reasonably well which seemed to remove my doubts about other internal damage.
I put the head back cylinder the opposite cylinder.
With one cylinder in tack and the one where the cylinder was broken removed the pump could be hand turned without much effort.
I reinstalled the new cylinder and I could still turn the pump by hand but it was a little stiffer but not as stiff as when fully assembled.
I reinstalled the head and connected the lines. At this point I could still turn the pump but it was much harder.
Seemed a bit easier than when I first tried but still much stiffer to turn than when the head was off.
I tried powering back up but not much different than the first time I tried to power it up.
Not sure where to go next. Suggestions are greatly appreciated.
Thanks in advance.
I must admit I know a lot more about air compressors now that I spend considerable time on your site.
Thanks Mo. Glad the site has been informative.
The humming motor means that it is trying to start, but cannot.
Can the pistons be cycled more easily with the line from the pump head to the tank removed? I suspect not, but that's a good way to ensure that the tank check valve isn't the problem. With the line off, if the pistons cycle easily, that would suggest a blocked tank check valve.
Since you have already checked the other things that might cause the motor to hum, and they are good, then the only other thing that remains is that something about the reassembly and working of the new cylinder is backloading the motor to the point where it cannot start against the load.
Sorry Mo. Wish I could be more help.
What is torque for head bolts on 232177 model?
by Jerry Slauter
Just put in new piston and connecting rod. Compressor builds 80 PSI and will bono further. No signs of leaks, but pressure is obviously lst somewhere.
Jerry, there is a general guide under troubleshooting on the site map page.
Your compressor symptoms however don't point to leaking head bolts but rather a valve or gasket problem.
If you did not use a new gasket kit, or if any of the valves were dirty, damaged or installed incorrectly, that could lead to the running but not building past 80 PSI.
My first thought is that your pump has a gasket leak between compress and high pressure side that is opening at around 80 PSI.