A705-74-880 Issue K
Page 40 © Edwards Limited 2009. All rights reserved.
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MAINTENANCE
5.11 Flush the cooling jacket
The cooling jacket will reqire flushing every 12 months or when the cooling efficiency is reduced because of deposits
or other contamination in the cooling jacket. The pressure and flow rate of the water supply that you use to flush
the cooling jacket must be equal to or higher than the normal cooling-water supply. Do not exceed the pressure
specified in Section 2.2.
1. Switch off your cooling-water supply.
2. Refer to Figure 1. Disconnect the cooling-water supply and return pipelines from the cooling-water inlet (32) and
outlet (2) connections.
3. Fit a suitable water supply pipeline to the water outlet connection (2), and fit a suitable water return pipeline
to the cooling-water inlet (32).
4. Turn on the water supply to flush the cooling jacket in the reverse direction, and wash out any deposits from the
cooling jacket.
5. Allow the water to flow for a few minutes, switch off the water supply, and then disconnect the water return
pipeline.
6. Place a suitable splash tray under the cooling-water inlet (32), then unscrew and remove the 1¼"-½" BSPT
reducing bush (that is, the large fitting to which the TCV adaptor is fitted) from the port in the end of the pump.
7. Use a suitable tool to remove any sediment from the port.
8. Turn on the water supply for a short time to flush any remaining deposits from the cooling-jacket.
9. Disconnect the water supply pipeline from the cooling-water outlet connection (2), then dispose of the water
and deposits in the splash tray.
10. Apply a suitable thread sealant (such as Loctite 577) to the threads of the 1¼"-½" BSPT reducing bush, and then
refit the fitting to the port in the end of the pump.
11. Refit your pump cooling-water supply and return pipelines to the water inlet (32) and outlet (2) connections.
5.12 Replace the interstage relief valve
1. You must replace the interstage relief flap-valve if it is damaged. This item is available in the Swing PRV
Overhaul Kit: refer to Section 7.3.
2. Refer to Figure 9. Undo and remove the four M8 bolts (11) that secure the valve retainer (9) to the exhaust
manifold (3).
3. Place two of the bolts in the jacking holes (10) and tighten the bolts to remove the retainer (9) from the exhaust
manifold.
4. Remove the O-ring (8), flap-valve (7), hinge bushes (1), valve body (2) and O-rings (4 and 5) from the exhaust
manifold (3).
5. 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 interstage relief
valve.
6. Fit the new interstage relief valve to the exhaust manifold and secure with the four M8 bolts (11). Tighten the
bolts to a torque of 10 Nm (7.4 lbf.ft).
If the water flow through the cooling jacket is blocked or restricted, the water in the pump may
get very hot. Allow the pump to cool down before you remove the cooling-water connections. If
you do not, hot water may be ejected from the pump and may cause injury.
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