Eng
lish (US)
14
8.4 Replacing the shaft seal (LCSE pumps)
1. Complete preparations listed in section
8.3 Disassembling the
pump
.
2. Remove the coupling guard screws (8E).
3. Remove the coupling guard (34F).
4. Remove the nut (35E) and the bolt (8E) that hold the coupling
halves together.
5. Pry apart the coupling halves (23D), remove the coupling key
(12B).
6. For pumps with lubrication lines, unscrew the tubing
connector from the pipe tee of the air vent assembly. Thread
sealing compound was applied to the threads during factory
assembly, and the resulting bond may retard but will not
prevent manual disassembling.
7. Remove the seal housing cap screws and slide the seal
housing (2N) up the shaft to remove it.
8. Remove the shaft seal (14A) manually from the shaft (6A).
Apply water-soluble lubricant to the shaft, if necessary, to
ease the removal of the shaft seal. Pull the seal head
assembly manually from the shaft, using a slight twisting
motion (as necessary) to loosen bellows from shaft.
9. Remove and discard the shaft seal spring and the shaft seal
retainer.
10. Remove and discard the shaft seal seat from the seal housing
(2N) and thoroughly clean the inside cavity of the seal
housing.
11. The interior surface of the bellows on a new shaft seal is
coated with a bonding agent that adheres to the motor shaft.
When the old shaft seal is removed, the bonding agent no
longer exists and the bellows may crack or split during
removal. We always recommend that you install a new
mechanical shaft seal if it becomes necessary to remove the
existing shaft seal from the shaft.
12. Clean and lubricate the shaft (6A) with a water-soluble
lubricant and make sure no sharp edges can cut or scratch
the bellows of the new shaft seal.
13. Press the new shaft seal seat firmly into the seal housing.
Avoid direct contact between the seal face and metallic or
abrasive objects, and wipe the seal face clean after
installation to ensure an abrasive-free sealing surface.
14. Slide the new shaft seal (14A) onto the shaft by applying even
pressure to the shaft seal.
15. Install the shaft seal housing (2N) on the shaft.
16. See the reassembly instructions in section
8.6 Reassembling
the pump
.
8.5 Replacing the wear ring
1. Complete preparations in sections
8.3.1 Preparations before
disassembling the pump
and
8.3.2 Disassembling the liquid
end
.
2. Remove the rotating assembly.
3. Remove the pump housing (1A) from the pipes, if necessary,
to facilitate easy access to the interior of the pump housing. If
necessary, remove the flange bolts at the pipes.
4. Remove a worn wear ring (4A) by drilling two holes slightly
smaller than the width of the wear ring into the exposed edge
of the wear ring. Insert a chisel into the holes to completely
sever the wear ring at the holes and break the wear ring into
two halves for easy removal.
5. Clean the wear ring cavity in the pump housing prior to
installing a new wear ring to ensure a properly aligned fit.
6. To reassemble, press fit the new wear ring squarely into the
pump housing cavity. Tap the wear ring into place to make
sure it is pressed home into the cavity.
8.6 Reassembling the pump
1. Clean all parts before reassembly.
2. Refer to the parts list to identify required replacement items.
3. Specify the pump serial or catalog number when ordering
parts.
4. Reassemble the pump in the reverse procedure used for
disassembling.
5. Observe the following when reassembling the pump:
– All mechanical seal components must be in good condition
or leakage may result. We recommend that you replace the
complete shaft seal.
– Install new shaft sleeves by bonding them to the shaft with a
thread-locking fluid.
6. Re-install the coupling guards on coupled pumps.
Mark or measure the original position of the pump
coupling on the motor side.
Do not use metal tools on the wear ring surfaces.
Use only rubber, rawhide, wood or other soft
material to prevent damage to the wear ring.
WARNING
Moving machine parts
Death or serious personal injury
- Reinstall approved coupling guards and make sure
they are in place prior to operation.
