Confusing compressor issue

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Forum topic by Robert posted 11-26-2020 07:21 PM 226 views 0 times favorited 1 reply Add to Favorites Watch
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4292 posts in 2449 days

11-26-2020 07:21 PM

Ingersoll 5HP compressor about 15 yrs old.

Last year I found it running away – smoke was everywhere, the compressor hot enough to boil water. Shut it down, took to compressor repair shop, they said the unloader valve failed. They replaced regulator and it’s been running fine for about 6 months.

Today was the second time I found it DOA, pressure down to zero, when I hit reset button on motor, it starts up, seems to run fine and makes pressure.

About 3 months I replaced regulator because the on-off lever basically disintegrated.

Today I had to push reset again, it ran to pressure but would not shut off. I could hear air leaking from unloader while it was running , so I shut it off manually.

When I did that, it unloaded like normal and air stopped leaking from unloader.

I think it’s overheating and tripping the thermal on the motor.

The motor and compressor sound just fine when running. I replaced the regulator with the same model the comp shop did. Would that matter if IR specifies a different model?

-- Everything is a prototype thats why its one of a kind!!

1 reply so far

View M_Dominic's profile


12 posts in 2945 days

#1 posted 11-26-2020 08:47 PM

You might check the amperage draw on the motor when it is first running and then after a couple of hours. If the compressor got very overheated I wonder if a bearing started going south or vanes damaged etc. If there is some damage from overheating it might keep happening over time. Another possibility, if the unloader is leaking at some connection do you know at what pressure it starts leaking? Could it be that the pressure reading is off in the sense that the pressure is actually much higher than what the leaking connection makes it seem like. If so, perhaps the compressor is being asked to push higher for longer than it should?

-- Dominic Ryan

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