© Edwards Limited 2015. All rights reserved. Page 25
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Maintenance
A352-03-880 Issue B
5.4 Replace the oil
1. Operate the pump for approximately ten minutes to warm the oil, then switch off the pump. This lowers the
viscosity of the oil and enables it to be drained from the pump more easily.
2. Isolate the pump from the electrical supply and disconnect it from the vacuum system.
3. Remove the oil filler plug (Figures 1, 2, and 3, item 2).
4. Place a suitable container under the oil drain tap (Figures 1, 2, and 3, item 8).
5. Open the drain tap and allow the oil to drain into the container.
6. If the oil drained from the pump is contaminated, pour clean oil into the filler hole and allow it to drain out of
the pump. Repeat this step until the oil reservoir in the pump has been thoroughly cleaned.
7. Close the drain tap.
8. Using a suitable container filled with clean oil, pour the oil into the filler hole until the oil level reaches the
middle of the sight glass (Figure 10).
9. Allow a few minutes for the oil to drain into the pump. If necessary, add more oil.
10.Refit the filler plug.
11.Replace the oil filter (see maintenance manual).
12.Replace the gas ballast filter (see maintenance manual).
13.Reconnect the pump to the vacuum system.
14.Reconnect the electrical supply to the pump.
5.5 Changing the oil filter - (part of minor service)
During every draining, change the oil filter cartridge located at the bottom of the oil box and the O-ring located below
the filler plug.
5.6 Oil separating mist filters (cartridge) - (part of minor service)
The length of time at which the separating cartridge gets contaminated depends on the quantity of impurities taken
in. The cartridges are not reusable. Refer to Table 1 for recommended change intervals. Adjust the replacement
frequency as required to suit the pumping application.
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