S900-01-880 Issue C
Page 42 © Edwards Limited 2008. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
2. Remove the safety guards when the pump is in a safe state.
3. Inspect the belts as described in Section 3.7. Replace any worn or damaged belts.
4. Refit the safety guards.
5.9 Check the bearing condition
1. Shut down the vacuum system and vent it to atmospheric pressure. Allow the booster pump to cool to a safe
temperature.
2. Remove the safety guards when the pump is in a safe state.
3. Loosen the coupling and or belts to remove tension from the drive shaft.
4. Use a dial indicator on the shaft to determine the end play. Total end play must be less than 0.12 mm (0.005
inch):
If the end play is not excessive, continue at Step 5.
If the end play is excessive, contact your supplier or Edwards to arrange for a rebuild of the pump.
5. Refit the safety guards.
5.10 Clean the motor and drive
1. Shut down the vacuum system and vent it to atmospheric pressure. Allow the booster pump to cool to a safe
temperature.
2. Remove the safety guards when the pump is in a safe state.
3. Use a compressed air line or a soft brush to remove any dirt and dust from the motor and drive components.
4. Refit the safety guards.
5.11 Check the timing
Only suitably trained personnel should inspect the impeller timing. Edwards service engineers are available to carry
out such inspections on site or at a Edwards Service Centre.
Failure to properly time the booster pump can cause catastrophic damage to the pump.
5.12 Troubleshooting
Troubleshooting and recommended solutions are provided in Table 17.
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