A705-40-880 Issue B
Page 42
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Maintenance
1. Refer to
. Remove the oil filler-plug (3) and bonded seal (2): see Note above.
2. Place a suitable container under the oil drain-port (6); the container must have a capacity of at least 4 litres.
3. Unscrew and remove the oil drain-plug (4) and bonded seal (5) and allow the oil to drain from the gearbox.
Dispose of the bonded seal (5).
4. Refer to
. Undo and remove the four M5 screws (7) from the bezel (6) on one of the oil-level sight-
glasses.
5. Remove the bezel (6), O-ring (5), sight-glass (4), O-ring (3) and compression ring (2). Dispose of the O-rings.
6. Clean all of the sight-glass components and the sight-glass recess in the gearbox (1) with a soft lint-free cloth. If
necessary, use a suitable cleaning solution; if you use a cleaning solution, ensure that all of the solution is
removed before you reassemble the sight-glass.
7. Refit the compression ring (2) in the sight-glass recess in the gearbox (1).
8. Fit two new O-rings (3, 5) and the sight-glass (4), then fit the bezel (6) and secure with the four M5 screws (7).
9. Repeat
to clean the other oil-level sight-glass.
10. Refer to
. Place a suitable funnel or nozzle into the oil filler-port (1).
11. If the oil drained from the pump is very discoloured, flush the gearbox with new or clean oil two or three times,
until the oil which drains from the gearbox is clean.
12. Wipe clean the oil drain plug (4), then fit a new bonded rubber seal (5).
13. Fit the oil drain-plug (4) and bonded seal (5) to the drain-port (6).
14. Fill the gearbox through the funnel or nozzle, with the correct grade and quantity of oil. Allow the oil to drain
into the gearbox and then check the level on the oil sight-glass (refer to
).
15. Remove the funnel or nozzle from the oil filler-port (1) and refit the oil filler-plug (3) and bonded seal (2) to the
oil filler-port (1).
16. Dispose of the used oil safely: refer to
.
5.9
Relubricate/inspect the rotor bearings
Note:
If you use the pump on a harsh application, we recommend that an Edwards service engineer removes and
cleans the bearing assembly before it is relubricated: contact your supplier or Edwards to arrange this.
5.9.1
Introduction
The frequency of relubrication of the rotor bearings depends on the operating temperature of the pump.
shows the recommended frequencies.
For maximum pump reliability, we recommend that you change the gearbox oil when you relubricate the rotor
bearings: refer to
Use the procedures in the following sections to relubricate the rotor bearings.
Table 15 - Recommended rotor bearing relubrication frequencies
Pump operating temperature
Relubrication frequency
up to 70 °C (158 ºF)
Every 8800 hours (1 year)
up to 85 °C (185 ºF)
Every 4400 hours (6 months)
up to 90 °C (194 ºF)
Every 2200 hours (3 months)
