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Maintenance
A366-04-880 Issue A
5.4 Replace the oil
Refer to Figure 1 for the items in brackets.
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 your electrical supply and disconnect it from your vacuum system.
3. Remove the oil filler-plug (3).
4. Place a suitable container under the drain-tap (10). 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.
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 indicated on the bezel of the sight-glass (9), see Figure 4.
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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