Edwards nEXT85 - Additional Tools and Items Required; Service Kit; Preload Check; Figure 3 Bearing Preload Measurement and Setting Tool

Figure 3
Bearing preload measurement and seng tool
Addional tools and items required
Addional tools are required to perform a bearing module and oil cartridge replacement.
These items are not part of the bearing exchange tool kit B8G200845 and will need to be
acquired separately.
• T15 Torx screwdriver
• Torque driver (torque range required 2 to 6 Nm)
• ¼" square drive
• 2.5 mm AF hex key or T-bar
• T10 Torx drive bit
• 4 mm hex bit
• Lint-free cloth
• Latex gloves (recommended)
Service kit
Before commencing with the bearing module service,
conrm that you have purchased the
correct bearing and oil cartridge service kit B8G200811 or oil cartridge service kit
B8G200828.
Preload check
WARNING:
Allow the pump rotor to stop and then disconnect the motor controller before you
remove the pump from your vacuum system for maintenance or fault nding
procedures.
Service on page 11 describes how to perform an oil cartridge and bearing module
replacement.
Part of this process involves checking the bearing preload condion aer the service has
been completed. Preload is the process wherein a permanent thrust load is applied to the
main bearing. Thrust is applied by the misalignment between the inner stac and the outer
rotang passive magnec bearing located at the inlet of the pump.
B8G2-00-840A - Pre-service
Page 9