© Edwards Limited 2012. All rights reserved. Page 29
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
A705-61-880 Issue M
Note: If you need to pour oil into the gearbox frequently, or if there is a sudden loss of a large amount of oil, the
pump may be faulty: shut down the pump and contact your supplier or Edwards.
Figure 1 shows the locations of the two oil-level sight-glasses on the pump. Refer to Figure 8 and check that the pump
gearbox oil-level is at the MAX mark on the bezel of the oil-level sight-glass (10): see Figure 1, detail C. If the oil-
level is below the MAX mark:
1. Remove the oil filler-plug (12) and bonded seal (13) from the oil-filler port (1), fit a suitable funnel to the oil-
filler port, then pour oil through the funnel into the pump gearbox until the oil-level is at the MAX mark on the
bezel of the oil-level sight-glass (see Figure 1, detail C).
2. If you overfill the gearbox:
Place a suitable container under the oil drain-plug (3);
Unscrew and remove the drain-plug (3) and bonded seal (4) and allow oil to drain from the gearbox;
When the oil level reaches the MAX mark on the sight-glass (see Figure 1, detail C), refit and tighten the oil
drain-plug (3) and bonded seal (4);
Continue at Step 1 again, to check that the oil-level is now correct.
3. Refit the oil filler-plug (12) and bonded seal (13) to the oil-filler port (1).
5.4 Inspect the gas ballast system
Use the following procedure to inspect the gas-ballast system.
Note that if you have not connected a nitrogen gas-ballast supply, the gas-ballast air filter element must be replaced
every three years as part of the pump overhaul (see Section 5.15). However, you may need to replace the air filter
element more frequently if you use the GV pump in an environment where there are excessive air-borne particulates;
refer to Table 15 for the Item Number for a new air filter element.
1. If you have connected a nitrogen gas-ballast supply, continue at Step 6, otherwise continue at Step 2 to inspect
the air filter element.
2. Refer to Figure 6. Turn the top-cap (1) clockwise (when viewed from the top-cap end of the gas-ballast air filter)
to release it from the filter body (4), then remove the top-cap.
3. Inspect the filter element (3); if there are excessive deposits lodged in the air filter, continue at Step 4,
otherwise continue at Step 5.
4. Remove and dispose of the used filter element (3), and fit the new filter element (3) into the filter body (4).
5. Refit the top-cap (1) to the filter body (4) and turn it anticlockwise until it clicks, to secure it to the filter body:
ensure that the inlet (2) on the top-cap does not point upwards, otherwise debris, dust or liquids may enter the
filter body.
6. Refer to Figure 6 (page 30). Inspect all of the clamps (4, 6, 9) in the gas-ballast system and check that they are
secure: tighten any loose connections.
5.5 Inspect the pipelines and connections
1. Inspect all cooling-water pipelines and connections; check that they are not corroded or damaged. Replace any
of the pipelines and connections that are corroded or damaged. Check that all cooling-water connections are
secure. Tighten any connections that are loose.
2. Inspect all air or nitrogen supply pipelines and connections; check that they are not corroded or damaged.
Replace any pipelines and connections that are corroded or damaged. Check that all air or nitrogen supply
connections are secure. Tighten any connections that are loose.
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