Variant With Galvanic Anode; Dismantling And Re-Assembly; Dismantling; Re-Assembly - Wilo Drain SP Notice De Montage Et De Mise En Service

ENGLISH
9.2.2 VARIANT WITH GALVANI C ANODE :
If the « sea water » design was chosen, a sacrificial anode is fastened
onto the impeller inspection cover :
Cover fitted with 1 anode
The loss of the anode material should be checked after 1 month, 3
months and 6 months maximum after the pump was filled with sea
water. The anode exchange is necessary when it has lost 75% in volume :
Consumed anode.
Replacement frequency depends on the water chemical composition, its
temperature, pH, resistivity, on the way the pump is operated, ...

9.3 DISMANTLING AND RE-ASSEMBLY

9.3.1

DISMANTLING

Make sure that electric power is disconnected and could not be
switched on again by fault during maintenance operations.
• Drain the piping at least between the isolating valve installed on the
suction and discharge side.
• Remove drain plug and drain the pump casing.
• If necessary disconnect any measuring sensors and gauges.
• Pump casing can be kept fastened to pipe work.
• Remove motor fastening screws and move the motor rearward so that
there is enough space to remove the back pull-out assembly.
When using a coupling with spacer part, it is not necessary to
move the motor rearward.
• Dismantle coupling guard and the half coupling on pump side.
9.3.1.1 DISMANTLING THE MECHANICAL SEAL
Cast iron variant :
1. Unscrew mechanical seal housing fastening nuts 6580
2. Remove lantern and impeller rearward.
3. Remove casing seal 4510.
Stainless steel variants (split casing design) :
1. Unscrew half casing fastening nuts 6580
2. Remove casing seal 4510.
3. Remove front wear plate 1915 and remove the other casing seals.
Next steps :
4. Remove impeller nut 2912 and washer 2911.
18
Cover fitted with 2 anodes
5. Slide the impeller 2200 out.
6. Remove impeller key 6710.
7. Slide out rotating part of the mechanical seal 4200 on the shaft.
9.3.1.2 DISMANTLING THE MECHANICAL SEAL HOUSING
Close coupled variants :
1. Remove motor fastening screws 6570 from motor 8020.
2. Remove mechanical seal housing 4211.
Variant with bearing bracket :
1. Remove mechanical seal housing fastening screws 6570 from housing
4011.
2. Remove mechanical seal housing 4211.
Stainless steel variants :
1. Remove mechanical seal housing fastening screws 6570 from housing
4211.
2. Remove mechanical seal housing 4211.
3. If necessary remove stationary seat and leap seal.
4. Slide out the shaft sleeve.
5. Depending on pump size : remove rear wear plate fastening screws
6570.
6. Remove rear wear plate and gasket 4510.
9.3.1.3 COMPLETE DISMANTLING OF BEARING BRACKET
ASSEMBLY
Biblock variant with IEC adaptation lantern :
1. Remove motor fastening screws 6580.
2. Remove the motor 8100 with the half coupling 7200.2 on.
3. Take the coupling flexible part 7310 apart.
4. Unscrew half coupling stop screw and slide it out from the shaft.
Ball bearings removal :
1. Remove screws 6570 from rear ball bearing cover 3011.
2. Take the cover 3260 apart.
3. Slide out the shaft 2100 with the two ball bearings 3011 from the
bearing housing 3200.
4. Withdraw stop ring 6544.
5. Press out ball bearings 3011 from the shaft.
9.3.1.4 COMPLETE DISMANTLING OF THE CASING
One piece casing :
1. Remove wear plate fastening screws 6570.
2. Take front wear plate 1915 apart.
Non return valve :
1. Remove suction flange fastening nuts 6580.
2. Remove the suction flange 1139.
3. Remove the non return valve assembly 5420.
9.3.2

RE-ASSEMBLY

Before starting assembly of the pump consult the sectional
drawing.
Respect screws and bolts tightening torques.
Check that threads, bearing and gaskets surfaces are clean.
9.3.2.1 ASSEMBLY OF BEARING BRACKET
1. Clean with care the inside of the bearing housing 3200 and the surface
of ball bearings housings.
2. The following methods are recommended to fit the bearings on the
shaft :
rst
1 method : Use a hot plate, hot bath, oven or an induction heater to
heat the bearing race so that it can be easily slided onto the shaft. It will