Edwards Vapour Diffusion Vacuum Pump Diffstak 63/150M

Allow the Diffstak to cool and open it to atmospheric pressure.

Drain the pump fluid as detailed in Section 5.4.

Disconnect the following connections

Remove the pump from the system.

Remove the valve-plate from the shaft (refer to Sections 5.5.2 and Section 5.5.3).

Examine the valve-plate seal and the 'O' rings on the valve-shaft for wear or damage.

Allow the Diffstak pump to cool and open it to atmospheric pressure.

Switch on the pump heater for a maximum time of two minutes to warm the pump fluid.

Ensure the pump fluid is not vaporised.

Disconnect the Diffstak from the electrical supplies.

Detach the Diffstak from your vacuum system.

Remove the drain-plug and allow the fluid to drain from the pump.

Choose the cleaning solution suitable for the type of pump fluid used.

Ensure the jet assembly can be vapour de-greased.

Inspect the pump interior for solid deposits of pump fluid.

Is there a solid deposit of pump fluid around the base?

Use an ultrasonic cleaning bath to remove deposits if present.

Wash the interior of the pump and components with the selected cleaning solution.

Move the valve to the fully open position

Remove the screws securing the valve-plate to the shaft

Withdraw the valve-shaft complete with its lever from the valve-body

Check that all parts are removed

Inspect the removed parts for any damage

Document any issues found during the removal process

Isolate the pump from the electrical supply

Wipe the radiation shield with a soft cloth

Use a suitable cleaning solution if necessary