© Edwards Limited 2007. All rights reserved. Page 27
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Maintenance
A344-02-880 Issue J
5.3 Check the oil-level
Note: If required, you can check the oil-level while the pump is operating, however you must switch off the pump
and isolate the pump and other components in the pumping system from the electrical supply before you
pour oil into the pump
Refer to Figure 1 for the items in brackets.
1. Check that the oil-level in the sight-glass (7) is between the MAX and MIN level marks on the bezel of the
sight-glass.
2. If the oil-level is near to or below the MIN level mark, remove the oil filler-plug (6) and pour more oil into the
reservoir until the oil reaches the MAX level mark. If the oil-level goes above the MAX mark, open the oil
drain-tap (8) and drain the excess oil from the pump. When the oil level falls to the MAX mark, close the oil
drain-tap (8). Refit the oil filler-plug.
3. Refit the oil filler-plug (6), tighten the plug firmly by hand. Do no over-tighten.
4. If the oil is contaminated, drain and refill the pump with clean oil as described in Section 5.4.
5.4 Replace the oil
Refer to Figure 1 for the items in brackets.
1. Operate the pump for approximately tenminutes 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 your electrical supply and disconnect it from your vacuum system.
3. Remove the oil filler-plug (6).
4. Place a suitable container under the drain-tap (8). Open the drain-tap and allow the oil to drain into the
container.
5. 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.
6. Close the drain-tap (8).
7. Fill a suitable container with clean oil and pour the oil into the filler hole until the oil-level reaches the MAX
level mark on the bezel of the sight-glass (7).
8. Allow a few minutes for the oil to drain into the pump. If necessary, add more oil. Refit the filler-plug.
9. Replace the fine oil-filter (see Section 5.5).
10. Replace the gas-ballast filter (see Section 5.6).
11. Reconnect the pump to your vacuum system.
12. Reconnect the electrical supply to your pump.
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