Edwards EXT200/200H GCMS, Instruction Manual, Page: 29 / 38

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Maintenance
B756-01-880 Issue K
5 Maintenance
5.1 Introduction
The maintenance operations for the EXT Split Flow Pumps are described in the following sections. The ISX Inlet
Screen, the WCX Water Cooler, the inlet strainer and inlet flange seals are available as spares (refer to
Section 7 ).
Fit the ISX Inlet Screen as described in Section 3.3.2 . Fit the WCX Water Cooler as described in Section 3.6.3 .
5.2 Bearing maintenance
When supplied, the pump contains sufficient lubricant to supply the bearings for life. No routine maintenance is
therefore required between bearing replacements. The bearings are not user-serviceable. The bearings will need to
be replaced at the recommended minor service interval. This is typically more than 20,000 hours, but may be less,
depending on the type of pumping duty on which the pump is used.
When the bearings need replacement, Edwards recommends exchanging the pump for a factory-reconditioned
replacement. Alternatively, send the pump to an Edwards Service Centre to have the bearings replaced.
When returning the pump to an Edwards Service Centre, use the procedure included at the end of this manual. Please
note that the instruction to drain all fluids does not apply to the lubricant in the pump oil reservoirs.
5.3 Rotor life
The fatigue life of the EXT Split Flow Pump rotors is typically 40 000 to 50 000 cycles of acceleration from rest to full
speed and then back to rest. As a precautionary measure, Edwards recommends that pumps are returned for a major
service (rotor replacement) after 20 000 cycles or ten years, whichever occurs first.
WARNING
The EXT Split Flow Pumps are not to be serviced by the customer. Pumps requiring servicing should
be returned to Edwards or serviced by a qualified Edwards engineer.
WARNING
Allow the pump rotor to stop, then disconnect the controller before removing the pump from the
vacuum system for maintenance or fault finding procedures.
WARNING
Do not remove the EXDC Controller/EXC Controller cable from the pump until the pump is
completely at rest. To do so could expose personnel to hazardous voltage and potentially damage
the EXDC/EXC Controller.