Wilo Wilo-CronoBloc-BL, Инструкция по установке и эксплуатации

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English
Installation and operating instructions Wilo-IL/-DL/-BL 35
9.2 Maintenance work DANGER! Risk of fatal injury!
Falling pumps or pump parts may result in life-threatening injuries.
• When performing maintenance work, protect the pump compo-
nents against falling.
9.2.1 Replacing the mechanical seal During operation, there may be a slight amount of drip leakage. A vis-
ual inspection should be performed from time to time, however.
If there is clearly detectable leakage, the seal must be changed. Wilo
offers a repair kit which contains the necessary parts for replacement.
Replacement • Disconnect the system from the power supply and secure it against
being switched back on again
• Close the check valves in front of and behind the pump.
• Depressurise the pump by opening the bleed valve (Fig. 1/2/3,
Item 1.31).
DANGER! Risk of scalding!
Due to high fluid temperatures there is a risk of scalding.
• If the fluid is hot, allow it to cool down before performing any work.
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 37).
• Disconnect the motor or power cables if the cable for dismantling the
drive is too short.
• Dismantle the coupling protection (Fig. 1/2/3, Item 1.32).
• Loosen the coupling screws (Fig. 1/2/3, Item 1.5) on the coupling unit.
• Loosen the motor fastening screws (Fig. 1/2/3, Item 5) on the motor
flange and lift the drive off the pump with suitable hoisting gear.
On BL pumps, the adapter ring comes loose (Fig. 3, Item 8).
• By loosening the lantern fastening screws (Fig. 1/2/3, Item 4), dis-
mantle the lantern unit with coupling, shaft, mechanical seal and
impeller from the pump housing.
• Loosen the impeller fastening nut (Fig. 1/2/3, Item 1.11), remove the
washer underneath (Fig. 1/2/3, Item 1.12) and pull the impeller
(Fig. 1/2/3, Item 1.13) off the pump shaft.
• Pull the mechanical seal (Fig. 1/2/3, Item 1.21) off the shaft.
• Pull the coupling (Fig. 1/2/3, Item 1.5) with the pump shaft out of the
lantern.
• Thoroughly clean the sliding/mating surfaces of the shaft. If the shaft
is damaged, it must be replaced.
• Remove the counter ring of the mechanical seal with the sealing collar
from the lantern flange, as well as the O-ring (Fig. 1/2/3, Item 1.14)
and clean the seal seats.
• Press a new mechanical seal counter 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 O-ring seat groove on the lantern.
• Check the coupling sliding surfaces. If necessary, clean and lightly oil
them.
• Pre-install coupling shells on the pump shaft with spacer discs
inserted in between and insert the pre-mounted coupling/shaft unit
carefully into the lantern.
• Pull a new mechanical seal onto the shaft. A commercially available
dishwashing liquid can be used as a lubricant.
• 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.