A301-05-880 Issue A
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Maintenance
5.2 Maintenance plan
Table 14 details the maintenance operations necessary to maintain EH pumps in normal use. Instructions for each
operation are given in the section shown.
More frequent maintenance may be required if the EH pump is used to pump corrosive or abrasive gases and vapours.
If necessary, adjust the maintenance plan according to system requirements.
5.3 Check the oil levels
Note: If there is a loss of oil from the shaft seal reservoir, the shaft seal may have failed. Contact the supplier
or an Edwards Service Centre for advice.
Use the following procedure to check the oil levels in the sight glasses. Refer to Figure 1 and 2 for the location of the
filler plugs and sight glasses. During normal operation, the hydrokinetic drive/gearbox sight glass (Figure 8, item 3)
may appear empty or show a froth because the oil is in circulation around the coupling.
1. Shut down the EH pump, vent it to atmospheric pressure and allow it to cool.
2. Refer to Figure 8. Check the shaft seal oil level. If the oil level is below the bottom of the reflector plate (6),
refer to Section 3.4 and refill the shaft seal reservoir.
3. Check the hydrokinetic drive/gearbox oil level. If the oil level is below the top of the reflector plate, refer to
Section 3.4 and refill the hydrokinetic drive/gearbox oil reservoir.
4.
On all EH1200, EH2600 and EH4200 model
pumps only, check the gear cover oil level. If the oil level is below the
middle of the reflector plate, refer to Section 3.4 and refill the gear cover.
5.4 Inspect the pump connections
1. Check that the cooling water connections are secure.
2. Inspect the cooling water pipelines and connections for corrosion, leaks and damage.
3. Check that the electrical connections are secure.
4. Check the electrical supply cables for damage.
5. Inspect all the vacuum pipelines for corrosion and damage. Check that all the vacuum connections are secure.
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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