Disassembling Vertical Pumps (Kpv); Inspecting The Components; Reassembling The Pump (Kp, Kpv, Kpvs) - Grundfos KP Instrucciones De Instalación Y Funcionamiento

8.2.5 Disassembling Vertical pumps (KPV)

1. Remove the coupling guard and remove the coupling grid.
2. Remove all the cap screws on the bearing housings (124)
except for the two on the lower pump housing (6B) to hold the
rotating assembly in place while removing the upper pump
housing (6A).
3. Remove the roll pin (26B) then lift off the upper pump housing
(6A).
4. Place the gaskets in water to keep them from drying out and
shrinking.
5. Remove the shaft assembly from the pump housing.
6. To disassemble the rotating assembly, refer to section
replacement.

8.2.6 Inspecting the components

1. While the pump is disassembled, inspect all components for
wear, damage, deterioration or erosion.
2. Inspect the shaft sleeves and replace them if they are worn or
deeply scored.
3. Check the impeller wear ring (if used) and the pump housing
wear ring (45) for erosion or wear and replace them if badly
deteriorated, to renew original pump performance. The design
clearance is 0.018 in. to 0.022 in. (0.457 mm to 0.558 mm)
diametrically. Clearances greater than 0.040 in. (1.016 mm)
will affect pump performance and new wear rings must be
installed.
4. Examine the lapped faces of the mechanical seals for scoring,
heat checking or cracking. Examine mechanical seal
elastomers (rubber components) for deterioration or
hardening. Replace mechanical seals if any damage exists.
5. Check any external source of cooling or lubricating fluid lines,
and/or recirculation lines and ports for clogs, kinks or other
restrictions.
6. Clean machined mating surfaces of all components to remove
grit, grime and/or old sealing material before reassembling
pump.
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8.3 Reassembling the pump (KP, KPV, KPVS)

1. Reinstall the impeller (49) and the key (11) on the shaft (51),
centering the impeller on the shaft with respect to the sleeve
or the lock nut threads. Be sure the impeller is installed on the
shaft the same way it came off, with the vane curvature and
per the orientation mark made during disassembly. For proper
rotation, see figs.
– The pump will deliver little or no water if the impeller is
installed backwards.
– Be sure a good O-ring gasket is in place on each sleeve, if
the shaft has sleeves. Replace as necessary.
2. Replace the shaft sleeves (116) or nuts, turning them in the
Bearing
opposite direction of pump rotation. Do not place a wrench on
the part of the sleeve that comes in contact with the seal or
the packing. Tighten evenly so the impeller position will not
shift.
3. Replace the wear ring retaining ring (65) over the wear ring
(45).
4. Slide the wear ring (45) over each impeller hub.
5. Replace the wear rings (45) on the impeller (49). Replace with
new seals or packing. Replace the bearing housing (124) on
the shaft (51) carefully so as not to damage the seal (11B).
Replace the bearing (54) into the outboard housing and
washer and snap ring. Replace the coupling key (11A) with
the coupling half.
6. For packing type pumps, follow the steps in section
8.2.2 Bearing, seal and packing replacement
section
Replacing packing, each
10 and 11. Note that:
then the steps in
side.