Thanks for the replies, especially the first one from Michael Porter; it
appears it WAS the unloader valve. When I blew it down for the first
"test" yesterday I only ran the pressure down enough for the pressuer
switch to try to start. Today I went out and ran the tank completely
empty and then turned the compressor over by hand; it turned relatively
freely, and started up fine when I closed the disconnect. I hosed off
the outside of the unloader valve with electrical cleaner; it was
somewhat gunked up, as well as the pressure switch guts. It seems to be
working fine now but I'll probably order a new unloader.
On 3/27/2016 7:27 PM, Dave Cavanaugh wrote:
> This afternoon my air compressor locked up. It's a two cylinder 60
> gallon Campbell-Hausfield that I bought at HD about ten or twelve
> years ago. 5 HP single phase, two cylinder, about 16 CFM at 90 PSI.
> The first time I heard the belt squealing so I flipped the breaker and
> got the flywheel turning using a pipe wrench. After a couple of
> rotations it seemed pretty free so I blew it down and it started ok,
> but when it came up to pressure and stopped the flywheel stopped dead;
> it didn't coast to a stop, and when I tried to start it again it was
> locked up again.
>
> It's not making any more noise that usual, it's just freezing up. I
> suspect something is getting hot and dragging. I guess I'll pull the
> pump in the next week or so and tear it down, but I'm tempted to just
> order a new pump and call it good. This is crappy timing because I'm
> in the middle of a furniture commission and my little portable hot dog
> compressor won't run my Dynabrades, plus I'm moving in about a year
> and building a new shop, which will have a new 7.5 HP, two stage
> compressor.
>
> Yes, there is oil in the sight glass; in fact I just changed the oil a
> couple of months ago. I used some 20 Wt ND I had on hand; probably
> should have used Mobil One....but what color cap?
>
> Advice, opinions, suggestions?
> thanks
> Dave
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