Max300-LG : Description - Specifications - Installation Guide
Extrel
Core Mass Spectrometers
Page 18
Figure 9: Roughing Pump
Using a 5mm hex key, remove the drain plug on the front of the pump to allow the oil to
drain into the catch pan. Loosening the fill plug will speed oil drainage. Once the oil has
drained out of the pump, re-install the drain plug and tighten it. Note the color of the oil.
If any of the following colors are present, be sure to flush out all of the old oil during the
oil change:
1.) Yellow : Pump needs new oil (approximately six months of use)
2.) Dark Yellow : The oil should have been changed a few months ago.
If this is the color of the oil in a six month period, there may be a slight leak
in the vacuum system. Check periodically to make sure that the oil does
not change in color again.
3.) Amber : A pump failure may be imminent. Check the pump oil every month.
Remove the oil fill plug located on top of the pump. Carefully pour new vacuum pump
oil (appropriate for the pump and application) through the fill plug opening until the oil
level in the site glass window is between the fill lines on the pump housing. Lastly, re-
install the fill plug, remove the catch pan and properly dispose of the used pump oil.
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