Replace The Oil; Inspect And Clean The Inlet-Filter - Edwards E2M28 Instruction Manual

1. Check that the oil‑level in the oil sight‑glass is between the MAX and MIN level
marks on the bezel of the oil sight‑glass.
2. If the oil‑level is near to or below the MIN level mark, remove the oil filler-plug 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 oil drain‑plug and drain the excess
oil from the pump. Refit the oil drain‑plug. Refit the oil filler‑plug.
3. If the oil is contaminated, drain and refill the pump with clean oil as described in
Replace the oil on page

6.4 Replace the oil

Refer to
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 allows the oil 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.
4. Place a suitable block under the pump-motor to tilt the pump and place a suitable
container under the oil drain-plug (gravity drain). Remove the oil drain-plug and
allow the oil to drain into the container.
5. If the oil is dirty or contaminated:
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6. Refit the oil 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 oil sight-glass.
8. Allow a few minutes for the oil to drain into the pump. If necessary, add more oil.
Refit the oil filler-plug.

6.5 Inspect and clean the inlet-filter

Refer to
1. Unscrew the inlet adaptor and remove the O-ring, circlip and inlet-filter.
2. Wash the filter in a suitable cleaning solution. Allow the filter to dry.
3. Refit the inlet-filter, circlip, O-ring and inlet adaptor.
A37310880_V - Maintenance
35.
Figure: General view of the pump on page 11
Refit the oil drain-plug and pour clean oil into the pump.
Reconnect the pump to the electrical supply and operate the pump for about
5 to 10 minutes.
Disconnect the pump from the electrical supply, remove the oil drain-plug and
allow the oil to drain out of the pump.
Repeat this step until the oil reservoir is clean.
Figure: Remove/replace the inlet filter on page
for the items in brackets.
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36.