MEGACHEM
5
Fig. no.11 : Removal of impeller from pump shaft
5.3
Dismantling the bearing unit
Fig. no. 12a : Dismantling the bearing unit
Under no circumstances use force!
1. Remove the impeller by unscrewing impeller washer bolt
(901.03) & washer (554)
2. Remove seal cover / gland from discharge cover
3. Remove discharge cover by unscrewing its bolts from
bearing bracket.
4. Pull shaft protection sleeve off the shaft
5. Remove bearing covers (360.01/02) and gaskets by
unscrewing of hex. bolt (901.04). Refer fig. no. 12a.
6. Fasten the bearing unit (330) firmly to the bench vice
refer fig No. 12b. Strike the pump shaft end with a soft
hammer.
7. Fasten the shaft with its bearings to the bench vice and
detach bearings from shaft with an extractor or by means
of a hammer and a punch. Fig no. 12c.
Fig. no.12c : Removal of the bearings from pump shaft.
Fig no.12b : Dismantling the pump shaft from bearing bracket.
Note :
Always replace the bearings once they have been
removed from the shaft with new ones.
Casing side
Impeller side
Max.
0.6
0.6
Min.
0.5
0.5
5.4
Removing of Mechanical seal
To replace the & mechanical seal it is necessary to dismantle
the pump.
After removing the discharge cover (525), draw the mchanical
seal out from discharge cover by removing seal cover.
6
Reassembly
6.1
Pump
Reassembly in accordance with standard engineering practice.
Coat the fits and screw connections with graphite or similar
before reassembly.
Check oil seal & o-rings for its damage; replace if necessary.
All gaskets must be renewed; make sure the new ones have
the same thickness as the old ones.
6.2
Clearance table
Table no. 4
If after some period, these clearances get doubled due to
wear; please consult KSB.
6.3
Replacing of bearings
1. Check the shaft (210) with its shaft protection sleeve (524)
(as applicable) for eccentricity, between centres, Maximum
allowable eccentricity is 0.05mm.
2. Fasten the shaft (210) to the bench vice using soft sheets
between the vice clamp jaws to avoid damage. Refer fig
no.14.
3. Heat the bearings (321.01/02) in the oven about 80
0
C
max. and push it on to the shaft. Fig. no.13. Allow the bearings
to cool down. Then tap it lightly against the shoulder using
suitable pipe punch.
Fig. no. 13 : Fitment of bearings.
