© Edwards Limited 2009. All rights reserved. Page 45
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MAINTENANCE
A705-74-880 Issue K
Figure 12 - Exploded View of Pump Motor, Coupling Drive and Coupling Housing - Key
5.15 Overhaul the pump
We recommend that the pump be given a major overhaul every six years. Such an overhaul is outside the scope of
this manual and should be done by qualified Edwards service personnel: contact your supplier or Edwards.
5.16 Trouble shooting Guide
1. Bolt 11. Shaft bearing nut
2. Key 12. Coupling cover
3. Set screws 13. Bolt
4. Set screw 14. Coupling hub
5. Set screw 15. Coupling insert
6. Bolt 16. Drive hub
7. Coupling housing 17. Holding ring
8. Key 18. Motor shaft
9. Pump shaft 19. Pump-motor
10. Gearbox 20. Gap
Table 8 - Troubleshooting guide
Symptom Check Action
The pump suddenly stops. Has the shutdown thermal snap-switch
operated to stop the pump because the
pump is operating at too high a
temperature?
Check that there is a sufficient flow of
cooling-water through the pump: check
that the cooling-water supply is on and is
within pressure and temperature
requirements (refer Section 2).
Has the cooling-water supply been
interrupted, or has it failed?
If your cooling-water supply is on and is at
the correct pressure and temperature,
the cooling jacket may be blocked: clean
the cooling jacket (refer to Section 5.11).
Has the pump seized because the
shutdown thermal snap-switch is faulty?
Check the operating temperature of the
pump (at the position shown in Figure 1,
item 3). If the operating temperature is
significantly higher than the normal
operating temperature of between 122 to
140°F (50 to 60°C) and the pump does not
turn over, the pump may have seized due
to coolant water failure and snap-switch
failure. Contact your supplier or Edwards
for advice.
Is there a hydraulic lock in the pump?
Has the pump seized due to deposits?
Isolate electrical supply. Isolate pump
from process. Remove the coupling cover
and rotate the pump drive shaft by
inserting a bar into the holes in the motor
coupling. If the pump can be freed,
replace cover and revert to normal pump
start up procedure. If not, contact your
supplier or Edwards.
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