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Page 99
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maintenance
A533-23-880 Issue C
7. Ensure that the new 'O' ring is correctly positioned on the oil filler-plug (2), then refit the filler-plug to the HMB
pump.
8. Refit the right-hand side enclosure panel: refer to Section 3.16.
6.11
Relubricate the FDP rotor bearings
Note:
This requires a gas module seals kit.
1. Remove the upper and lower front covers from the iF system by undoing the quarter turn fasteners and retain.
2. Remove the lower side panels from the iF system as described in Section 3.4.
3. Remove the skirt cover by undoing the two M5 cap head screws securing it to the base assembly.
4. Unplug the ’Gas Module’ loom from the Control Module. Remove the Gas Module by undoing the three M5 cap
head screws connecting it to the front bulkhead.
5. Remove the O’rings from the six gas pipe turrets protruding through the front bulkhead. Dispose of the O’rings in
accordance with Section 7.
6. Mark the order of the gas pipe turrets in the slots of the front bulkhead.
7. Unplug the ’Sensors’ loom and the ’Electrics box’ loom from the control module.
8. Undo and remove the four M10 nuts and washers securing the front bulkhead to the bulkhead strips.
9. Undo and remove the two M10 nuts and washers securing the front bulkhead to the bulkhead strips.
10. Insert a suitable wedge between the top cover and the top of the HMB.
11. Carefully remove the front bulkhead from the iF system, taking care not to damage the looms or the gas pipe
turrets.
12. Remove the two bearing covers from the front of the FDP.
13. Use clean, lint free cloth, or a plastic or wooden spatula to remove as much old grease as possible from the
covers and bearings. Do not use your fingers for this operation.
14. Inspect the bearings for obvious signs of wear or the presence of debris. If the bearings are worn, return the
pump to an Edwards Service Centre for repair.
15. If the bearings are in satisfactory condition, force new PFPE grease (as detailed in Section 2.5.1) into the
bearings. Do not over pack the bearings or the pump will run hot.
16. Check the bearing cover O’rings for signs of damage or debris before refitting it onto the bearing covers.
17. Replace the bearing covers onto the pump.
18. Refit the front bulkhead to the iF system, taking care not to damage the looms or the gas pipe turrets.
19. Remove the wedge between the HMB and the top cover.
20. Use the two M10 nuts and washers removed in step 9 to secure the front bulkhead to the bulkhead strips.
21. Use the four M10 nuts and washers removed in step 8 to secure the front bulkhead strips to the base assembly.
22. Plug the ’Sensors’ and ’Electrics box’ looms back into the Control Module.
23. Coat the new O’rings (supplied with the gas module seals kit) with Fomblin grease and then fit them over the gas
pipe turrets.
24. Fit the Gas Module to the front bulkhead and secure it using the M5 cap head screws removed in step 4. Plug the
’Gas Module’ loom into the Control Module.
25. Use the two M5 cap head screws removed in step 3 to refit the skirt cover to the base assembly.
