If a pump has been completely disassembled into the component parts or the
pump sump case has been removed and cleaning of the internal parts needs
to be accomplished we typically use mineral spirits in a degreaser.
We also use mineral spirits and a wire brush and a little elbow
grease. Once the parts are cleaned, it is important to clean the
mineral spirits off as well as possible before reassembly as mineral
spirits has a vapor pressure higher than the ultimate vacuum of the
pump. For simplicity, clean the mineral spirits off the parts
reassemble and flush the pump with HyVac Flushing Oil. Then fill
with the HyVac vacuum pump oil of choice. This should get you up and
running and at pressure.
Other industry standard cleaning procedures will follow and are more in
line for true high vacuum and ultra high vacuum work and involve things
like cleaning with a phosphated cleaner and then using a water then, an
acetone rinse. This is just an example, please do not take
literally, but I will get more specific and accurate in depiction
later. I just wanted to illustrate that it is a multi-step approach
to cleaning for high vacuum work. There might even include an oven
bake to 200 deg C. The process gets more involved and I will to when
I get a little extra time.