KSB HPK-L, Installation & Operating Manual

Page: 51 / 74

7 Servicing/Maintenance
51 of 74
HPK-L
1136.8/15-EN
WARNING
Back pull-out unit tilting
Risk of crushing hands and feet!
▷ Suspend or support the bearing bracket at the pump end.
1. If required, suspend or support bearing bracket 330 to prevent it from tilting.
2. Unbolt support foot 183 from the baseplate.
3. Loop a rope tightly around the neck of bearing bracket 330.
4. Undo hexagon nut 920.01 at the volute casing.
5. Pull the back pull-out unit out of the volute casing.
6. If necessary, clean the threaded holes for forcing screws 901.31 and use forcing
screws.
7. Remove and dispose of joint ring 411.10.
8. Place the back pull-out unit on a clean and level surface.
7.4.5 Removing the impeller
ü The notes and steps stated in ( ð Section 7.4.1, Page 49) to
(
ð
Section 7.4.4, Page 50) have been observed/carried out.
ü The back pull-out unit has been placed in a clean and level assembly area.
1. Undo hexagon nut 920.95.
2. Remove disc 550.87 from shaft 210.
3. Pull impeller 230 off shaft 210.
4. Remove keys 940.01.
7.4.6 Removing the plain bearing
ü The notes and steps stated in ( ð Section 7.4.1, Page 49) to
(
ð
Section 7.4.5, Page 51) have been observed/carried out.
1. Pull cup spring 950.23 and locking ring 515.21 off the shaft. If possible, also pull
out locking ring 515.22 and bearing sleeve 529.21 in the process.
7.4.7 Removing the mechanical seals
Pump set with KSB mechanical seal 4HL
ü
The notes and steps stated in (
ð
Section 7.4.1, Page 49) to
( ð Section 7.4.6, Page 51) have been observed/carried out.
ü
The bearing bracket has been placed in a clean and level assembly area.
1. Undo the socket head cap screw or grub screw in the coupling hub and use a
puller to pull the coupling half off the pump shaft. Remove key 940.02.
2. Loosen hexagon head bolts 901.84 and remove fan hood 832.
3. Undo hexagon socket head cap screws 914.02.
4. Gently drive shaft 210 together with rolling element bearings 320.02, bearing
cover 360.02, fan impeller 831, mating ring carrier 476 and mechanical seal 433
out of bearing bracket 330 towards the drive end.
5. Undo grub screws 904.32.
6. Pull mechanical seal 433.02 off shaft 210 towards the pump end.
7. Pull mating ring carrier 476 off at the pump end together with the mating ring
of the mechanical seal.
8. Take the mating ring out of mating ring carrier 476.