A705-40-880 Issue B
Page 54 © Edwards Limited 2011. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
5.12.5 Prepare the pump for operation
1. Refer to Figure 3. Use one of the new rubber bonded seals to refit the coolant drain-plug (2), then refill the
pump with coolant: refer to Step 6 to 8 of Section 5.9.2.
2. Refer to Figure 13. Refit the drain-plug (7) to the bottom end cap (6) of the heat exchanger.
3. Refer to Figure 4. Refit the fittings (4, 6) on your cooling-water supply and return pipelines to the connections
(3, 5) on the services panel.
5.13 Overhaul the pump
We recommend that the pump is given a major overhaul every three years. If the EDP pump is part of an ATEX system,
you must give the pump a major overhaul every three years.
Such an overhaul is outside the scope of this manual and should be done by trained customers or by qualified Edwards
service personnel only. Please contact your supplier or Edwards for more information.
5.14 Replace the pressure relief valve (EDP250 and EDP400 only)
You must replace the pressure relief valve if it is damaged. The Pressure Relief Valve is available as a spare: refer to
Section 7.3.
1. Refer to Figure 7. Undo and remove the four M8 bolts (11) which secure the valve retainer (9) to the exhaust
manifold (3).
2. Place two of the bolts in the jacking holes (10) and tighten the bolts to remove the retainer (9) from the exhaust
manifold.
3. Remove the O-ring (8), valve flap (7), hinge bushes (1), valve body (2) and O-rings (5, 4) from the exhaust
manifold (3).
4. Clean the inside of the exhaust manifold to remove any deposits; if necessary, use a suitable cleaning solution. If
you use a cleaning solution, ensure that all of the solution is removed before you fit the new pressure relief
valve.
5. Fit the new pressure relief valve to the exhaust manifold and secure with the four M8 bolts (11). Tighten the
bolts to a torque of 10 Nm.
6. Leak test the system.
5.15 Inspect the torque limiter
Refer to the attached amendments for details on inspecting the torque limiter or coupling.
5.15.1 Lower the pump-motor and coupling cover (without the motor change frame)
1. Refer to Figure 14 or 15. Remove the fixing bolts (11) which secure the coupling cover to the gearbox and lower
the pump-motor and coupling cover assembly until the pump-motor rests on the two cross-members at the
bottom of the pump frame (Figure 16, item 4). Ensure that the pump-motor, motor coupling and coupling cover
assembly is adequately supported throughout and does not fall over.
2. Continue at Step 13 of Section 5.15.2.
Ensure that the pump-motor, motor coupling and coupling cover assembly does not fall over when
you move it. If it falls over, it can cause injury to people.
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