Edwards E-LAB 2, Instruction Manual

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Maintenance
A652–07–880 Issue D
5.4 Check the pump oil level
Note: If required, the oil level can be checked while the pump is operating, however, the pump must be switched
off and the pump and other components in the pumping system must be isolated from the electrical supply
before pouring oil into the pump.
1. Check that the oil level in the sight glass ( Figure 1 , item 8) 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 one of the filler plugs (7) and pour more oil into
the reservoir until the oil reaches the MAX level mark. If the oil level goes above the MAX mark, remove the
drain plug (9) and drain the excess oil from the pump. Refit the filler plug.
3. If the oil is contaminated, drain and refill the pump with clean oil as described in Section 5.5 .
5.5 Replace the pump oil
The diagrams on the side panels of the pump and on the oil change tag give guidance on when to replace the pump
oil. When the colour of the oil is approximately the same colour as the middle bar on the side panel (or tag), replace
the oil as described below. If the pump continues to be used and the oil condition deteriorates until the colour of the
oil is approximately the same as the lower bar on the side panel (or tag), clean and overhaul the pump as described
in
Section 5.11 .
Use the following procedure to replace the pump oil:
1. Operate the pump for approximately ten minutes to warm the oil, then use the on/off switch ( Figure 1 , item 12)
to 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 one of the oil filler plugs (7).
4. Place a suitable block under the pump motor to tilt the pump and place a suitable container under the drain
plug (9). Remove the drain plug 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. Refit the drain plug, remove the block and reconnect the pump to the vacuum system.
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 (8).
8. Allow a few minutes for the oil to drain into the pump. If necessary, add more oil. Refit the filler plug.