LumberJocks

Compressor issue - follow up

  • Advertise with us

« back to Power Tools, Hardware and Accessories forum

Forum topic by Robert posted 10-13-2019 05:46 PM 282 views 0 times favorited 4 replies Add to Favorites Watch
View Robert's profile

Robert

3558 posts in 2025 days


10-13-2019 05:46 PM

While back I posted about my compressor making an awful noise and smoking.

Fast forward, I purchased a new compressor unit and when I installed it, now it appears the regulator is bad.

It will come to pressure but I noticed right away the distinctive brief air exhaust sound does not happen when it shuts off. It also erratically started the pump even though pressure was met.

So I’ve ordered a new regulator. I’m keeping the new compressor pump I figure what happens was the regulator wasn’t shutting it down and the pump overheated.

I guess what I’m asking is where does the air release that occurs when the compressor stops come from?

I checked the small release valve at the end it’s the regulator pressure tube it seems ok, I also checked the pressure tube itself it was not blocked or occluded.

Thanks guys.

BTW it’s a 5HP single stage compressor even at $490 For the pump it’s cheaper to fix.

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


4 replies so far

View HerringImpaired's profile

HerringImpaired

26 posts in 253 days


#1 posted 10-13-2019 09:13 PM

Is it the Unloader valve? It’s used to take the pressure off between the compressor and tank so the compressor can startup again without the pressure already on it.
I had to replace this on an old air compressor I used to own. The compressor would not start because it was already pressurized, and the motor would spin on the belt making the blue smoke leak out….
A trip to a local air compressor shop and a new unloader was procured and installed. Problem solved.

-- "My greatest fear is that upon my demise, my wife will sell my tools for what I said I paid for them."

View Robert's profile

Robert

3558 posts in 2025 days


#2 posted 10-14-2019 12:46 PM

Yes that sure sounds like it. But in my case the compressor still runs the smoke I saw I assume was from the compressor overheating and building back pressure forcing oil out the breather.

Regulator will be here tomorrow hopefully the issue will be solved.

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

View ibewjon's profile

ibewjon

1040 posts in 3338 days


#3 posted 10-14-2019 01:43 PM

The pressure unloader is part of the pressure switch on my compressor. I thought it was sticking open on mine, but I found the check valve was allowing air to flow through the unloader. ( Not your problem). Turn off power and look inside of switch. It is a needle valve that closes as the pressure between the check valve and cylinder bleeds off. It may be dirty.

View Robert's profile

Robert

3558 posts in 2025 days


#4 posted 10-14-2019 07:40 PM

I didn’t know they could be repaired so I’ve already ordered a new regulator, oh well.

My next question is if the unit was running for a while (maybe up to a couple hours) is it likely the pump is damaged? I found it running making a very loud dieselling type noise and the shop was full of blue smoke. Pump was extremely hot when I shut it down. looked like about 1/2 the oil was gone.

the next day I topped up the oil & switched back it cycled ok once, but then the unloader valve malfunction happened (which I was unaware of at the time) I mediately shut unit down,
Thanks guys!

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

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com