9.2.1 Replacing The Mechanical Seal - Wilo VeroLine-IPL Notice De Montage Et De Mise En Service

9.2.1 Replacing the mechanical seal

Dismantling
Installation
Installation and operating instructions Wilo-IPL/DPL (1.1-7.5 kW)
Replacing the mechanical seal, see fig. 1/2.
• Disconnect the system from the power and secure it against being
switched on.
• Close the check valves in front of and behind the pump.
• Depressurise the pump by opening the vent screw (item 2.1).
WARNING! Danger due to extremely hot or extremely cold pressu-
rised fluid!
Depending on the temperature of the fluid and the system pres-
sure, when the venting screw is opened completely, extremely hot
or extremely cold fluid in liquid or vapour form may escape or shoot
out at high pressure.
• Always exercise caution when opening the venting screw.
• Disconnect the motor if the cable for dismantling the motor is too
short.
• Loosen the motor fastening screws (item 4) on the motor flange and
lift the motor with the impeller and shaft seal from the pump using
suitable hoisting gear.
• Loosen the impeller fastening nut (item 1.11), remove the washer
(item 1.12) beneath it and pull the impeller (item 1.13) from the pump
shaft.
• Remove the mechanical seal (item 1.21) from the shaft.
• Thoroughly clean the sliding/seat surfaces of the shaft.
• Remove the stationary ring of the mechanical seal with the sealing
collar from the lantern flange, as well as the O-ring (item 1.14) and
clean the seal seats.
• Press a new mechanical seal stationary ring with sealing collar into the
seal seat of the lantern flange. A commercially available dishwashing
liquid can be used as a lubricant.
• Install a new O-ring in the groove of the O-ring seat of the lantern.
• Pull a new mechanical seal onto the shaft up to the end of the taper
seat. A commercially available dishwashing liquid can be used as a
lubricant.
NOTE
When tightening screw connections in conjunction with the work
described in the following: Observe the screw tightening torque for
the thread type (see section "Screw tightening torques" on page 36).
• Install the impeller with washer and nut, countering at the impeller's
outer diameter while doing so. Avoid damage to the mechanical seal
due to jamming.
• Slowly insert the motor with impeller and shaft seal into the pump
housing using suitable hoisting gear and screw it into place.
• Connect the motor cable.
English
37