A301-05-880 Issue A
Page 28 © Edwards Limited 2014. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
5.6 Lubricate the rear bearing (All EH250FX and EH500FX model
pumps only)
Use the following procedure to replace the grease in the rear bearing. Refer to Section 2.6 for the correct type/grade
of grease.
1. Switch off the EH pump and isolate it from the electrical supply. Vent the EH pump to atmospheric pressure.
2. Refer to Figure 10. Remove the four plastic cover caps (8) from the bearing end cover (6).
3. Undo and remove the socket-head screws (7) located under the four plastic cover caps.
4. Remove the end cover (6) and O-ring (5). Dispose of the O-ring safely.
5. Note the exact location of the shims (4) and spacers (3) inside the end cover (6). Clean off all visible grease from
the end cover taking care not to misplace or damage the shims and spacers.
6. Use a soft, clean, lint free cloth or a plastic or wooden spatula to remove all visible grease from both bearings
(2).
7. Fill the visible side of each bearing (2) with clean grease, then lightly force the grease into the bearing.
8. Refill the visible side of each bearing (2) with clean grease.
9. Apply a light wipe of high-vacuum grease to the new O-ring (5) and fit into the groove in the end cover (6).
10. Check that the shims (4) and spacers (3) are correctly located in the end cover (6).
11. Refit the end cover (6) and secure it with the four socket-head screws (7). Tighten the screws evenly and refit
the plastic cover caps (8).
12. Leak test the system and seal any leaks found.
When removing the end cover, take note of the exact locations of the spacers and shims (Figure 10,
items 3 and 4) inside the end cover. These items must be refitted correctly in order to ensure that
the rotor clearance settings remain correct. Altering the rotor clearance settings may compromise
the constructional safety of the pump.
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