On Sun, 15 Jun 2008 00:33:53 -0500, Ignoramus20633
wrote:

On 2008-06-15, Bruce L Bergman wrote:
On Sat, 14 Jun 2008 18:54:03 -0500, Ignoramus20633
wrote:

I now think that possibly the motor is underpowered for the pump. I
have a 5 HP 184T 3 phase motor, which I may try on the compressor just
to see if it is able to run the pump. If yes, then there is something
wrong with the Baldor, if no, then Baldor is fine and this compressor
needs a bigger motor.

Don't think bigger motor, think smaller drive sheave - if the motor
was swapped they might have just grabbed whatever pulley was handy and
fit, or swapped the pulley off a 7-1/2 HP motor. The compressor head
may run at 5 HP fine - but slower.

The pump heads have various HP requirements depending on how fast
you spin them, which is a factor of the drive and driven pulleys.
Smaller drive pulley or larger pump pulley = slower pump speed = less
HP draw but also less CFM.

If it is a single belt, get an adjustable motor sheave and attach a
clamp ammeter to the power line, and you can dial in the max nameplate
amps as the compressor approaches the pressure switch cut-off setting.
Twin belts you just have to swap sheaves to get close but not over.



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.


Gunner

at yoyodyne they were all veterans of the psychic wars
exiled from the eighth dimension where the winds of limbo roar"
* * * * * * *mariposa rand mair theal