A373-10-880 Issue R
Page 24 © Edwards Limited 2012. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
5.3 Check the oil-level
Notes: 1. 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.
2. Do not mix hydrocarbon lubricants with PFPE or vice versa. If the oil is mixed, drain and refill with clean
oil as described in Section 5.4.
Refer to Figure 1 for the items in brackets.
1. Check that the oil-level in the oil sight-glass (12) 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 (1) 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 (11) 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 Section 5.4.
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 allows the oil 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 (1).
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) (11). Remove the oil drain-plug and allow the oil to drain into the container.
5. If the oil is dirty or contaminated:
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.
Table 9 - Maintenance plan
Operation Frequency Refer to Section
Check the oil level As required; at least monthly 5.3
Replace the oil 3 to 6 months depending on
application
5.4
Inspect and clean the inlet filter Every oil change 5.5
Clean or replace the gas-ballast filter Yearly 5.6
Clean the motor fan-cover and enclosure Yearly 5.7
Clean and overhaul the pump and replace
the blades as necessary
3 to 4 years depending on
application
5.8
Replace the run capacitor Every 4 years 5.9
Test the motor condition Every 4 years 5.9
Fit new blades Every 30000 hours of operation 5.10
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