7 Servicing/Maintenance
88 of 116
CHTRa
5. Attach the rotor to the lifting equipment; place slings around the shaft close to
the impellers.
WARNING
Improper storage of components
Risk of injury!
Damage to components!
▷
Secure components against rolling away.
6. Lift the rotor out of the lower casing half and set down on a suitable device for
further dismantling.
7.3.10 Dismantling the rotor
Heating the balance drum for removal
When applying heat to the balance drum on the shaft observe the following:
▪
Apply heat to the balance drum on the shaft using a torch with a fine tip.
▪
Heat the balance drum on the circumference.
▪
Do not apply heat directly to the shaft as this will cause it to expand.
▪
If the balance drum cannot be easily pulled off the shaft, additional heat may be
necessary.
▪
Apply heat to the balance drum until the temperature reaches approx. 150 °C.
▪
If the balance drum still fails to come free, the impeller and shaft should be
allowed to cool completely and the heating process repeated.
1. Remove neck bushes 456.01/456.02 and balance bush 605.01 by pulling them
over the shaft ends.
2. Remove casing wear rings 502.01/502.02 from the 2 outer impellers on both
rotor ends.
3. Bearing bush 545.01 comprises 2 halves. Pull both halves of bearing bush 545.01
apart and remove bearing bush 545.01.
CAUTION
Improper assembly/dismantling
Damage to thrust ring!
▷
Use a suitable tool to bend open the thrust ring until it can be pulled from the
shaft.
▷
Never bend the thrust ring excessively.
4. Heat balance drum 603.01.
5. Slide balance drum 603.01 a short distance towards the pump end.
6. Remove thrust ring 501.02 fitted thereunder.
7. Pull balance drum 603.01 off the shaft towards the drive end.
8. Remove balance drum key 940.02.
7.3.11 Removing the impellers from the rotor
NOTE
A step has been machined on the shaft at each impeller seat to facilitate
dismantling. It is recommended that each impeller be marked with a stage number
to ensure proper reassembly.
