Check The Oil-Level; Replace The Oil - Edwards A373-30-940 Instruction Manual

A373-10-880 Issue R
Operation
Check the oil level

Replace the oil

Inspect and clean the inlet filter
Clean or replace the gas-ballast filter
Clean the motor fan-cover and enclosure
Clean and overhaul the pump and replace
the blades as necessary
Replace the run capacitor
Test the motor condition
Fit new blades
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
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
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.
Page 24
Table 9 - Maintenance plan
As required; at least monthly
3 to 6 months depending on
Every oil change
3 to 4 years depending on
Every 30000 hours of operation
Section 5.4.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Frequency
application
Yearly
Yearly
application
Every 4 years
Every 4 years
© Edwards Limited 2012. All rights reserved.
Refer to Section
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.9
5.10
Section 5.4.