AMMRL: turbo pump lifetimes

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Hi,  From those of you with cold probes pumped by turbo pumps, I'm trying 
to get a rough idea of how long they typically run before their bearings 
start to go.  I've had some non-NMR folks tell me a good rule of thumb is 
that you can usually get 2 years out of a turbo pump before you need a 
rebuild or replacement.  Usually the backing pump requires maintenance 
before the turbo pump (and we've had our backing pump maintained, though 
maybe not as frequently as we could).  If you don't get a service contract 
from your cold probe manufacturer, how do you usually deal with a failing 
turbo pump?  Replace, repair (yourself or third party), some other option?

Thanks in advance for all replies,

Sean

-- 

 					Sean Moran
 					Bio-NMR Facility Manager
 					Dept. Biochem. & Cell Biol.
 					Rice Univ.
 					Houston, TX  77005
 					(713)348-3475 (lab)
 					(713)348-4255 (off)
 					(832)398-4208 (cell)
 					(713)348-5154 (fax)
 					seamus@rice.edu

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