KSB 4K Series, Installation & Operating Manual

Page: 18 / 32

5 Installation/Dismantling
18 of 32
4K / 4KD
Dismantling steps for a double mechanical seal
1.
Separate the pipes of the barrier/buffer fluid supply system from seal cover
471.01.
2.
Undo the hexagon head bolts at the bearing bracket lantern.
3.
Position the spacer so as to support shaft sleeve 523.
4.
Carefully pull casing cover 161 with seal cover 471.01 and the entire mechanical
seal in tandem arrangement off the bearing bracket lantern / pump shaft. Place
them down in a horizontal position.
5.
Undo nuts 920.02 of studs 902.02 at seal cover 471.01. Remove the seal cover
with O-ring 412.15.
6.
Remove mating ring 475.55 and O-ring 412.55 from seal cover 471.01.
7.
Slide primary ring 472.54 with O-ring 412.54 as well as spring 477.54 and disc
500.54 off shaft sleeve 523.
8.
Undo hexagon socket head cap screws 914. Remove springs 477.51 and thrust
ring 474.51.
9.
Lift casing cover 161 and turn it so that primary ring 472.51 and O-ring 412.51
can be removed.
10.
Remove primary ring 472.51 and O-ring 412.51 from the shaft sleeve.
5.5 Tightening torques
Table 6: Tightening torques for bolted/screwed connections
3)4)
Material C35E+QT/ C35+N A4-70/ A4-70 8.8 A2A/ 08
Stamp mark YK/ Y A4-70/ A4-70 8.8 / 8
Thread Tightening torques [Nm]
M8 - 16 23
M10 - 30 46
M12 40 55 80
M16 100 140 190
M20 190 200 380
M24 330 455 660
3)
For unlubricated bolts/screws at room temperature
4)
After repeated tightening of the threads and in case of good lubrication reduce the values by 15 to 20 %.