Posted by olddog on March 03, 2011 at 04:27:52 from (24.229.174.134):
In Reply to: Re: ot electric motor posted by dieseldoc on March 02, 2011 at 20:42:46:
Are these variable speed according to the vacuum level? Or do they run full speed and let air in to obtain vacuum level. I'm thinking of the rpms of the cooling fan(s) on the motors. Have seen them come unglued (heh heh) from the shaft. Are you running less than 14.5 inches of vacuum? 33 amps is just over the edge of 10 hp and does not allow for intransient loss along the way. Check all connections back to the pole. Are the pullys sized correctly? Got some milk cooling units blowing hot air on them or robbing them of cool air? Pumps gummed up with dried milk vapors or real milk if you jumped the trap(s) one time. Have you rinsed the sutorbuilts lately? Lotta hours on the pumps? VERY tight tolerances on that roots type blower, and just the slightest bearing wear will make them run hard at speed, even tho they appear to turn easy by hand when off. Mebbe I've given you a few things to talk to your dealer about.
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