Patterson HSC, Operation And Maintenance

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7
SECTION VI
REPAIRS AND REPLACEMENT
WARNING!!!
Whenever any disassembly work is to be done on the pump, disconnect the power source to the driver to
eliminate any possibility of starting unit. It is advisable that a qualified Pump service technician does the
disassembly and reassembly of the pump.
6-1 To Remove Rotor:
Reference: Pump Assembly Section
1. Remove coupling guard and disconnect coupling halves.
2. Disconnect any piping from the upper half casing (1B) that will interfere with its removal.
3. Remove bolting from the casing parting flanges and bearing caps. Remove the bearing caps
4. Loosen and remove all three screws in each mechanical seal gland (17).
5. Remove alignment pins between the upper and lower casing halves (1A & 1B).
6. Remove upper casing half (1B) by lifting straight up until clear of the impeller.
7. Place slings around the shaft near the bearing locations and lift the rotating element from the
lower casing (1A).
8. Place rotating element in a clean, dry work area for necessary disassembly. Case wear rings
(7) will be loose on assembly.
6-2 Disassembly of Rotating Element:
1. Remove the case wear rings (7) that will be loose on the assembly.
2. Remove the screws holding the bearing housings (31 & 33) to the bearing covers (37).
3. Remove bearing housings (31 & 33), exposing bearings (16 & 18). There is a bearing spacer
(78) that is a loose part in the outboard bearing housing (33). This will be needed at reassembly
of the pump.
4. Remove the outboard bearing retaining ring (18A).
5. Remove the bearings (16 & 18) from the shaft (6).
6. Remove the bearing covers (37) from the shaft (6).
7. Remove the glands (17) and mechanical seals (65) from the shaft (6).
8. Remove the shaft sleeve retaining rings (14A) and shaft sleeves (14).
9. Remove the impeller (2) from the shaft (6), noting the rotation direction of the impeller vanes
relative to the coupling end of the shaft, for reassembly later.