On Sun, 15 Jun 2008 09:17:11 -0500, Ignoramus25555
wrote:
On 2008-06-15, Gunner Asch wrote:
On Sun, 15 Jun 2008 00:33:53 -0500, Ignoramus20633
wrote:

This is a four belt pulley and the motor pulley seems quite small
already...

see second picture here

http://igor.chudov.com/projects/Champion-Compressor/

Ah..no..thats a pretty good sized pully, particularly for that
motor/pump combination.

Id drop it at least 1" in diameter.

Ive a deVillbis about the same size, with a 230 3ph 5hp motor on it,
with a pully that size..and it starts a bit slow if the unloader
doesnt **** right off the bad.

Dropping the pulley size is kind of the easiest solution, I gotta
agree, a few dozen bucks and I would be done.

Start it and run it up all the way to cutoff while watching the
motor amps. Except for the start surge, it should stay below or at
the motor nameplate amps.

If it's way over and the motor is grunting, try loosening the motor
mounts and the belts till they slip a little and the amps drop down to
nameplate, and see how it works then.

You can NOT leave the belts loose like that, but it's a good way to
tell the motor sheave is way too big. Then you get the Champion
charts for that pump head, and it will tell you the required Pump RPM
for 5 HP worth of work, and the motor sheave diameter you need to
reach it. Easy Peasy.

Looks like it has a centrifugal unloader system, the gadget on the
end of the crankshaft, and the tubing to the check valves. Make sure
that is releasing properly - if there's any head pressure at all until
the motor reaches full speed, you won't get it started.

By the way, I left this compressor pressurized to 22.5 PSI over night
and the pressure in the tank did not drop even by a fraction of
PSI. Which I consider to be good news. This means the tank does not
leak.

Still a good idea to depressurize it and take a look inside the NPT
inspection port plugs on the end shells with a flashlight. And probe
the bottom of the tank from the inside through the hole with a long
piece of 1/4" rod stock. If you feel big rust pits...

-- Bruce --