6. Tighten gland follower 452 lightly and evenly.
It must be easy to rotate the rotor.
Pure graphite packing ring
1. Clean the packing chamber.
2. Insert pure graphite packing ring 461.
3. Use stuffing box ring 454 to push home pure graphite packing ring 461.
There must be a visible gap between shaft protecting sleeve 523 and the packing
rings.
Insert each subsequent pure graphite packing ring 461 with its joint displaced by
approximately 90° in relation to the previous one. Use stuffing box ring 454 to
push each packing ring separately into the packing chamber.
The pure graphite packing rings 461 must always fit snugly in the stuffing box.
4. Position gland follower 452 on studs 902.2. Fasten by tightening nuts 920.2
lightly and evenly.
5. Use a feeler gauge to verify that gland follower 452 is mounted centred and at a
right angle to the shaft.
6. Tighten gland follower 452 lightly and evenly.
It must be easy to rotate the rotor.
7.5.4 Fitting the impeller
✓
The notes and steps stated in (
47) have been observed/carried out.
✓
The assembled bearing bracket as well as the individual parts are kept in a clean
and level assembly area.
✓
All disassembled parts have been cleaned and checked for wear.
✓
Any damaged or worn parts have been replaced by original spare parts.
✓
The sealing surfaces have been cleaned.
1. Insert key 940.1 and push impeller 230 onto shaft 210.
2. Fasten impeller nut 920.3, spring washer 930 and disc 550.3, if any (see table:
Tightening torques for screwed connections at the pump (
7.5.5 Re-installing the back pull-out unit
WARNING
Back pull-out unit tipping over
Risk of squashing hands and feet!
▷
Suspend or support the bearing bracket at the pump end.
✓
The notes and steps stated in (
49) have been observed/carried out.
✓
Any damaged or worn parts have been replaced by original spare parts.
✓
The sealing surfaces have been cleaned.
✓
For back pull-out units without coupling, install the coupling in accordance with
the manufacturer's instructions.
1. Insert new gasket 400.1 in volute casing 102.
2. If required, prevent the back pull-out unit from tipping over, e.g. by suspending
or supporting it. Then push it into volute casing 102.
3. Tighten nut 920.3 or 920.5 at the volute casing. Observe the tightening torques.
4. Fasten support foot 183 to the baseplate with a foundation bolt.
Fig. 20: Pure graphite
packing ring
7 Servicing/Maintenance
Etanorm
49 of 66
