5-2
5.2
How to replace the mechanical seal
The mechanical seal of the pump is of a cartridge type.
It can be replaced without disassembling the pump.
5.2.1. How to remove the mechanical seal
(1) To prevent the operation of the pump during work, check that the main power is turned off.
(2) Close the sluice valves on the suction side and discharge side, and discharge the liquid from the pump
using the drain plug.
Caution
Be careful when discharging water if the handled liquid is warm or hot.
Otherwise, you may burn yourself.
(3) Loosen the screw for fixing the coupling guards, and remove the coupling guard.
(4) Remove the hexagon socket bolts
for fixing the coupling, and remove the coupling.
* Insert a flat-blade screwdriver into the clearance of the coupling and widen it, and then the coupling
can be easily removed.
* For the models of ASVM(N)(G) 25 to 50, remove the parallel pin from the main shaft of the pump.
(5) For a model with a motor output of 7.5 kW or less, use a proper crane to remove the motor.
For models with a motor output of 11 kW or more, a spacer coupling is used and it is not necessary to
remove the motor.
(6) Loosen the three set screws
for fixing the mechanical seal and the main shaft of the pump.
Note
Do not completely remove the set screws.
Otherwise, the mechanical seal may be dissembled.
(7) Remove the hexagon socket bolts
, and remove the mechanical seal from the casing.
(8) Insert a flat-blade screwdriver into the circumference of the mechanical seal flange, and push up the
whole using leverage.
This completes the removal work of the mechanical seal.
Figure 5-2-1: How to remove the mechanical seal
Motor
Mechanical
seal
Casing
Coupling
