KSB CTN - Preloading the Mechanical Seal; Tightening Torques; Spare Parts Stock; Ordering Spare Parts

7 Servicing/Maintenance
57 of 76
CTN / CTN-H
3. Turn bearing nut 923 to the right.
Move the rotor to the upper stop.
4. Measure the dimension of the upper edge of the bearing nut/shaft end.
5. Lower the rotor from the upper stop by 0.5x the overall clearance.
One full turn of the bearing nut will cause the rotor to move upwards or
downwards by 1.5mm.
6. Screw the centring sleeve to the bearing nut with hexagon socket head cap
screws 914.12 and secure against rotation.
The throughholes in the bearing nut align with the tapped holes in the centring
sleeve.
7.5.7 Preloading the mechanical seal
Move the setting ring 500.12 and shaft protecting sleeve in the direction of the
motor to the setting dimension of 5mm (distance to the seal cover) and secure on
shaft 210 with grub screw 904.32.
7.6 Tightening torques
Use a torque wrench to tighten the bolted connections (902.01/920.01) between the
volute casing and the bearing bracket lantern.
Table27: Tightening torques [Nm] for screwed connections
Material of
stud/hexagon
nut
C35E+Qt/C 35 A4-70/A4-70 1.7709+QT/1.7258+QT
Stamp mark
on
stud/hexagon
nut
12)
YK/Y A4-70/A4-70 GA/G
Bearing
bracket
lantern
13)
A B A B A B
New
threads
14)
-15 %
15)
-20 %
15)
New
threads
14)
-15 %
15)
-20 %
15)
New
threads
14)
-15 %
15)
-20 %
15)
M10 - - - 30 25,5 24 47 30 39,9 25,5 37,6 24
M12 40 34 32 55 46,7 44 80 55 68 46,7 64 44
M16 100 85 80 155 131,7 124 190 155 161,5 131,7 152 124
M20 - - - 200 170 160 330 200 280,5 170 264 160
7.7 Spare parts stock
7.7.1 Ordering spare parts
Always quote the following data when ordering replacement or spare parts:
▪ Order number
▪ Order item number
▪ Consecutive number
▪ Type series
▪ Size
▪ Material variant
▪ Seal code
▪ Year of construction
12) Treat unstamped screwed connections like material pair C35/E+QT/C 35.
13) A: made of ductile material – except for JL1040; B: made of material JL1040
14) These values are determined on the basis of a friction coefficient of μ=0.12.
15) After repeated tightening of the threads and in case of good lubrication the values shall be reduced by 15 to 20%.