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Maintenance
A708-01-880 Issue E
9. Use the four bolts (17) to secure one of the coupling covers (16) to the coupling housing (15). Tighten the bolts
to a torque between 3 and 5 Nm (2.2 and 3.7 lbf ft).
10. Use the four bolts (17) to secure the other coupling cover (16) to the coupling housing (15). Tighten the bolts to
a torque between 3 and 5 Nm (2.2 and 3.7 lbf ft).
5.13 Clear a hydraulic lock (when necessary)
If the pump stops because of a hydraulic lock, use the following procedure to try to clear the lock and free the pump.
1. Isolate the pump from the process gases.
2. Switch off the pump, and leave it for at least 15 minutes (see warning above).
3. Refer to Figure 14. Undo and remove the four bolts (17) which secure one of the coupling covers (16) to the
coupling housing (15), and remove the coupling cover.
4. Fit a metal rod or other suitable tool to one of the holes in the drive hub (19), then try to turn the drive hub. If
the pump can turn, the hydraulic lock is cleared: continue at Step 5.
If the pump cannot be turned, it may have seized due to deposits in the pump. Flush the pump with cleaning
solution (refer to Section 5.9). If the pump can be freed, continue at Step 4, otherwise contact the supplier or
Edwards for advice.
5. Remove the metal rod/tool from the drive hub.
6. Refit the coupling cover (16) and secure with the four bolts (17). Tighten the bolts to a torque between 3 and 5
Nm (2.2 and 3.7 lbf ft).
7. Reconnect the pump to the electrical supply and restart it as described in Section 4.3.1.
5.14 Clean the vent adaptor
Shut down the pump and leave the pump for at least 15 minutes to allow any static charges to
dissipate before removing a coupling cover. If not, there may be a risk of explosion if the pump is
installed in a flammable atmosphere.
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