WARNING:
Clean the external surfaces of the pump in a well ventilated location. When using
cleaning solutions and solvents to clean the pump, observe all precautions specified
by the manufacturer. Avoid inhalation of any particulates which may be present in
the pump.
▪ Send the pump to an Edwards Service Centre for a bearing replacement.
▪ Purchase a bearing service kit and replace the bearing on-site (refer to Bearing on-
site maintenance on page 120).
8.2 Rotor life
The fatigue life of nEXT Turbomolecular pump rotors is typically 40,000 to 50,000 cycles.
As a precautionary measure, Edwards recommends that pumps are returned for a major
service (rotor replacement) after 20,000 cycles of acceleration to full speed and back to
a stop, or after ten years of use, whichever occurs first.
8.3 Cleaning the pump
If the inside of the pump is contaminated, it may not be possible to achieve the specified
ultimate vacuum performance, or pump-down times may increase.
In these circumstances the pump must be returned to an Edwards Service Centre where
the pump will be dismantled and cleaned. Refer to Return the equipment or components
for service on page 119.
Any organic solvent can be used to clean the external surfaces of the pump. Edwards
recommend the use of non-CFC solvents such as isopropanol or ethanol. Only a minimal
amount of a cleaning solution is required which is suitable for the contaminants on the
pump surfaces.
For environmental reasons, keep wastage of cleaning solutions and solvents to a
minimum.
8.4 Decoding service status words
The service status may be accessed directly via the serial link. This method of accessing
service status will give the most complete picture of current and future service
requirements and will allow preventative maintenance activities to be scheduled.
A summary of the current pending service status is provided in response to the service
status command:
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