Ours don't seem to like roughing out the H-device. Pfieffer seems to be
the only ones to service them--but their prices aren't too bad. The
ones on our XP are ok (~5 years).
Leybold trivac's were used on the 251--and we're using a relatively new
one the 253, outside the box (too big) to pump out the H-dev for the
time being--and the oil turned red pretty fast....hmmmm....
Maybe time for an inline filter???
Jim Palandri wrote:
> What is the life expectancy of Pfeiffer Duo 2.5 direct drive rotary
> vane pumps?
> Ours are waste line and inlet line (latter backing a turbo) pumps on a
> MAT253, and are about a year and two thirds old. Initially they worked
> Lately they seem to cause the pump oil to begin breaking down in just
> a few days. They produce a decent, but not great, vacuum with fresh
> oil, but the pressure will climb over an order of magnitude in two
> weeks, and browning the oil. Note we are using TKO77 oil, which Lesker
> claims is a substitute for P3. We think these pumps may be worn out,
> but, what are the experiences of others?
> Also, does anyone have a 253 that was furnished with some other brand
> of rough pumps, and, what brand(s) did the 252, 251 come with?