B344-21-880 Issue N
Page 36 © Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
5.2 Maintenance plan
The plan shown in Table 3 details the maintenance operations necessary to maintain the Diffstak pump in normal
use. Instructions for each operation are given in the section shown.
More frequent maintenance may be required if the pump has been used to process corrosive or abrasive gases and
vapours. If necessary, adjust the maintenance plan according to your experience.
5.3 Check the pump fluid-level
If the Diffstak boiler operates at a higher than normal temperature, check the level of fluid in the boiler.
1. Allow the pump to cool and open it to atmospheric pressure.
2. Remove the dipstick. Remove the ‘O’ ring from the dipstick, then use the dipstick to check the fluid-level. The
fluid-level should be visible on the dipstick and below the notch mark.
3. If the fluid-level is low, add more fluid as detailed in Section 3.9.
4. Allow the fluid to drain into the boiler and check the level again. If the level is too high, drain the excess fluid
(see Section 5.4).
5. Inspect the dipstick ‘O’ ring. Replace the ‘O’ ring if it is damaged or if thermal set has taken place.
6. Refit the dipstick and ‘O’ ring.
Table 3 - Maintenance plan
Operation Frequency Refer to Section
Check the pump fluid-level 3 Monthly (heavy duty)
6 Monthly (light duty)
5.3
Clean the cooling-coil Yearly 5.10
Inspect the pump fluid (drain if necessary) As required 5.4
Clean the pump As required 5.5
Clean the radiation shield As required 5.6
Lubricate/inspect the high-vacuum isolation-valve As required 5.7
Renew a heater As required 5.8
Check the heater securing nuts As required 5.9
Adjust or replace the position indicators As required 5.11
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