Disassembling The Pump; Preparations Before Disassembling The Pump - Grundfos KP Instrucciones De Instalación Y Funcionamiento

8.2 Disassembling the pump

8.2.1 Preparations before disassembling the pump

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.
CAUTION
Toxic material
Minor to moderate personal injury.
- Wash down the pump before doing any work on it.
WARNING
Hot, caustic, flammable or toxic materials,
including vapors
Death or serious personal injury
- Be extremely cautious when venting and/or
draining hazardous liquids.
Wear protective clothing when there are caustic,
corrosive, volatile, flammable, or hot liquids.
Do not breathe toxic vapors.
Do not allow sparks, open fire, or hot surfaces
near the equipment.
KP, KPV, KPVS pumps are designed for ease of maintenance
and, as such, the seals, sleeves, wear rings, clearances and
bearings can be inspected without having to remove the complete
rotating element or having to disconnect the inlet or outlet pipes,
or disturbing the alignment of the pump set.
WARNING
Moving machine parts
Death or serious personal injury.
- Do not insert a screwdriver between the impeller
vanes to prevent rotation.
Work on this equipment is to be performed only by qualified
personnel. Read the following instructions completely before
performing any work on the pump.
Before beginning disassembly of the pump, proceed as follows:
1. Close the inlet and outlet isolation valves.
2. Turn off any external source of cooling or lubricating fluid to
the shaft seals.
3. Drain the pump case by opening the drain plug and vent
plugs.
4. Disconnect and lock off the motor power source.
A clearance of 24 in. (610 mm) on each side of the
pump will allow for maximum access while servicing.
A minimum of 24 in. (610 mm) clearance is required
to remove the upper pump housing when accessing
the rotating element.
18
8.2.2 Bearing, seal and packing replacement
All normally required parts for KP pumps are available in kit form.
Refer to figs. 14 and 15.
Bearing replacement
1. Remove the motor.
2. Remove the coupling half from the pump shaft (51) using a
wheel puller and remove the coupling key (11A).
3. Remove the bearing covers (113C) and (113D).
4. Loosen the set screws in the eccentric locking rings of the
bearings (53 and 54) and turn the rings in the opposite
direction of the direction of rotation to loosen from the shaft, or
remove the retaining snap ring, whichever is applicable.
5. Remove the cap screws from each bearing housing (124) and
slide, with bearing, off its end of the shaft.
Take care to ensure the seal seats in the bearing
housings of seal type pumps are not broken during
housing removal.
6. Remove the bearings (53, 54) from the bearing housings.
7. Install the new seals and seal seats.
8. Reinstall the bearing housings less the bearings, noting that
the slinger (79) is in the correct position. Take care not to
break the seal seats of the seal type pumps by striking them
against the shaft.
9. Clean out the bearing housings and slide the new bearings
over the shaft and into the bearing housings. Press only on
inner race of the bearing. Use a bearing warmer, if available.
10. Turn the eccentric locking rings in the direction of pump
rotation to tighten on the shaft and tighten the set screws, or
replace the spacer and the retaining snap ring, whichever is
applicable.
11. Pack the ball bearings and bearing cover cavities with clean
ball bearing grease. See section
bearings.
12. Replace the bearing covers (113C, 113D).
13. If applicable replace the packing glands after following
packing instructions in section
14. Gently tap the coupling half on the shaft (51) over the key
(11A). Do not tap it if it can be pushed on. Using too much
force to drive on the coupling half can damage the ball
bearings and/or fracture the seal faces. If there is difficulty
pushing the coupling onto the shaft, heat up the coupling half
to a temperature of not more than 300 °F (148 °C) and then
use protective gloves to slide the coupling half onto the shaft.
15. Replace motor and realign.
On vertically mounted pumps, remove the rotating
assembly in order to replace the lower bearing and
seal assembly.
8.1.2 Lubricating the pump
Replacing packing, each side.