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Maintenance
A301-05-880 Issue A
5.5 Change the pump oil
Replace the pump oil as described below. Refer to Figure 1 and 2 for the location of the oil filler and drain plugs.
1. Switch off the EH pump, vent it to atmospheric pressure and allow it to cool.
2. Remove the hydrokinetic drive/gearbox oil filler plug.
3. Remove the hydrokinetic drive/gearbox oil drain plug from the underside of the hydrokinetic drive/gearbox and
allow the oil to drain into a suitable container.
4. Remove the shaft seal vented oil filler plug. Use a suitable pump to suck the oil out of the shaft seal reservoir.
5. Refit the hydrokinetic drive/gearbox oil drain plug.
6. Refer to Section 3.4 and fill the hydrokinetic drive/gearbox and shaft seal reservoir with oil.
7. Refit the hydrokinetic drive/gearbox oil filler plug and the shaft seal reservoir oil filler plug.
8.
On all EH1200, EH2600 and EH4200
model pumps only:
Remove the oil filler plug on the gear cover.
Remove the oil drain plug from the underside of the gear cover and allow the oil to drain into a suitable
container.
Refit the oil drain plug and refer to Section 3.4 to refill the gear cover with oil.
Refit the oil filler plug.
Changing the oil in an EH pump from hydrocarbon to PFPE could potentially cause a safety hazard.
PFPE EH pumps are generally used in hazardous applications which may involve the pumping of
gases with high concentrations of oxygen. If hydrocarbon oil comes into contact with gases with an
oxygen concentration greater than 25%, an explosion can occur.
Converting an EH pump that has been used on Hydrocarbon oil for use on PFPE oil requires the
pump internals to be cleaned. This usually requires the pump to be serviced.
Ensure that the correct grade of oil is used and that the oil levels in the pump are correct. If an
incorrect oil is used or if an oil level is incorrect, EH pump performance may be affected and the
EH pump may be damaged, which will compromise its constructional safety.
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