Grundfos KP Notice D'installation Et De Fonctionnement page 21

8.3.1 Disassembling and reassembling the sleeve bearing
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product, make
sure that the power supply has been switched off
and that it cannot be accidentally switched on.
Disassembling the sleeve bearing
1. Close the inlet and outlet side valves before starting
disassembly.
2. Remove the motor, after disconnecting all the electrical
connections.
3. Remove the coupling guard and remove the coupling grid.
4. Drain the pumped liquid from the pump. The pipe plug (20A)
and the recirculation lines can be used for draining.
5. Remove bearing covers (113C and 113D).
6. Loosen the set screws in the eccentric locking rings of the
bearing (53) and turn the ring in the opposite direction of the
pump rotation to loosen on the shaft, or remove the retaining
snap ring, or the lock nut and lock washer, whichever is
applicable.
7. 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).
8. Remove the roll pin (26B) then lift off the upper pump housing
(6A).
9. Place the housing gasket, as well as all the other gaskets, in
water to keep them from drying out and shrinking.
10. Remove the shaft assembly from the pump housing.
11. Remove the sleeves and then the impeller.
Reassembling the sleeve bearing
1. Using an appropriately rated sling and overhead lifting
equipment, place the pump housing assembly on a flat
surface. Remove the hex head bolts. If required, clean both of
the machined faces on the pump housing assembly with fine
grit sand paper. Remove the two roll pins from the lower pump
housing. Using an appropriate eyebolt and overhead lifting
equipment, remove the upper pump housing and clean it if
necessary.
2. Align the two wear rings (45) with the wear ring register in the
lower housing. Use a soft-faced hammer and brass punch to
drive the roll pins into the drilled holes on the wear ring bores.
3. Slide the wear rings onto the impeller wear rings, ensuring
that your hole and roll pin orientation marks are facing
outward.
4. Position the impeller (49) in the lower pump housing.
5. Determine correct rotation (clockwise or counterclockwise).
6. Carefully spray the shaft (51) with solvent and wipe off with a
clean rag. Install the drive key into the center key slot on the
shaft by gently tapping it with a soft-faced hammer.
7. Slide the shaft (51) into the bore of the impeller.
8. Install the lower sleeve (202). Make sure that it engages all
the threads. The impeller butts against the lower sleeve or
sleeve nut depending the pump size. Install the sleeve and
sleeve nut on the other side of the impeller. Use a spanner
wrench to secure the sleeves against the impeller hubs.
9. Use an overhead lifting equipment to position the upper pump
housing over the four alignment studs and install onto the
lower pump housing. Use a soft-faced hammer to drive the
two roll pins into the lower pump housing and remove the four
alignment studs.
10. Place the long cap screws into the mounting holes located in
the center area of the upper pump housing and place the
remaining cap screws into the mounted hole located on the
flange area of the upper pump housing. First tighten the four
cap screws in the center area using a crisscross pattern and
then complete all.
11. Spray the mounting face surfaces and finished inside
diameters of the seal housing with solvent and wipe off with a
clean rag. Carefully align and place the seal seat into the seal
housing (124). Slide the seal head assembly onto the in-board
or drive end of the shaft and seat it up against the shaft
sleeve.
12. Carefully slide and position the seal housing so the two blades
on the seal housing are oriented at 11 and 1 o'clock. Make
sure that you have the slinger on the shaft.
13. Assemble the roller bearing. Secure the bearing cover with
screws.
14. Assemble the sleeve bearing housing (which is press fitted
with graphalloy sleeve bearing).
15. Make sure that the shaft is rotating after assembly the bearing
housings.
16. Assemble the recirculation lines and pipe plugs.
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