Grundfos KP Notice D'installation Et De Fonctionnement page 19

Mechanical seal replacement
1. Follow the above steps to remove the bearing housings (124).
2. Remove the old seal head and the seal seat from the shaft
sleeve and bearing housing or seal cap.
It is not necessary to remove the bearings from the
bearing housings. However, we recommend that you
replace the bearings.
3. Inspect the shaft sleeves (116) for scoring or pitting.
4. Replace if the surface is rough to your fingernail.
Proper seal seat installation
1. Clean the seal cap or bearing housing (124).
2. Lightly lubricate the new seat's rubber cap with liquid soap.
3. Press in the seal seat into the seal housing, making sure the
seat is seated squarely and all the way into seal cap or
bearing housing. Do not touch the seal seat or the head faces.
Proper seal head installation
1. Clean and lightly lubricate the shaft sleeves (116) or the shaft
(51). Make sure that there are no sharp edges or corners to
cut the seal's rubber parts.
2. Lightly lubricate the seal face elastomers with liquid soap.
3. Slide the assembly onto the sleeve or shaft until the spring
touches the shoulder. Do not compress the spring. Make sure
that the notches on the carbon ring match the retainer's lugs
and the spring is in position on the seal head.
4. Reinstall the bearing housings (124) with bearings, noting that
slingers (79) are in correct places. Take care not to strike seal
seats against shaft.
5. Follow remaining bearing replacement steps to complete
assembly.
Replacing packing, each side
1. Remove the packing gland.
2. Remove the old packing distribution ring, if any, and use a
packing hook to remove the packing behind the distribution
ring.
3. If the packing retainer comes out, replace it against the
retaining ring.
4. Insert two new packing rings one at a time, staggering the
joints 180 ° and pushing them firmly back against the packing
retaining washer.
5. Insert the distribution ring, if any.
6. Insert three more packing rings (applies to most sizes)
staggering joints 180 °. If no distribution ring is used, one
extra packing ring is required.
7. Replace the packing gland.
8. Adjust the packing gland to permit a leakage of 40 to 60 drops
per minute for shaft lubrication.
9. Never overtighten the packing gland. For suction lift
applications, should it become necessary to overtighten the
packing while starting the pump, make sure to loosen the
packing immediately after the pump is started, allowing a
leakage of a 40 to 60 drops per minute. After initial startup,
additional packing and adjustment may be required.
8.2.3 Bearing and seal replacement for KPVS
1. Remove the coupling guard and the coupling. See section
8.2.2 Bearing, seal and packing
2. Remove the seal housing cap screws and the seal housing
(124a).
3. Remove the seal head assembly (105) from the shaft (51).
Water-soluble lubricant may be applied to the shaft to ease
the removal of the seal head. Pull the seal head assembly
from the shaft, using a slight twisting motion (as necessary) to
loosen the bellows from the shaft.
4. Discard the seal, the spring and the retainer.
5. Remove and discard the seal seat and gasket from the seal
housing (124a) and thoroughly clean the inside cavity of the
seal housing and flange.
6. The interior surface of the bellows on the new shaft seal is
coated with a bonding agent that adheres to the pump shaft.
When the old shaft seal is removed, the bellows may crack or
split during removal. We recommend that you install a new
mechanical shaft seal if it becomes necessary to remove the
existing shaft seal from the shaft.
7. Clean and lubricate the pump shaft (51) with a water-soluble
lubricant and make sure that no sharp edges exist to cut or
scratch bellows of the new seal.
8. Install the new gasket onto the seal housing.
8.2.4 Disassembling Horizontal pumps (KP)
1. Remove the nuts and bolts that hold the pump housing halves
together (6A, 6B), and remove cap screws holding bearing
housing (124) to pump housing.
2. Remove roll pin (26B) then lift off upper pump housing (6A).
3. Place the gaskets in water to keep them from drying out and
shrinking.
4. Remove shaft assembly from the case.
5. To disassemble rotating assembly, refer to section
replacement.
6. Unscrew and remove shaft sleeves (116) or impeller locknuts
by turning them in direction of pump rotation. One has RH
(right-hand) threads. The other has LH (left-hand) threads.
Use a strap wrench. Do not place the wrench on the part of
sleeve that comes in contact with the seal or packing.
7. Remove the wear ring retaining parts as necessary, locking
pin (24) and/or rings (65).
8. Slide the wear ring (45) off the impeller.
9. Make an orientation mark for later reference on the impeller
(49) on the coupling side before removing it from the shaft, to
help ensure it will be reassembled identically.
10. Press the impeller (49) from the shaft (51) and the key (11).
replacement.
Bearing
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