Disassembling The Pump - Grundfos LFE Instrucciones De Instalación Y Funcionamiento

8.3 Disassembling the pump

8.3.1 Preparations before disassembling the pump
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product, be sure
the power supply has been switched off and that it
cannot be accidentally switched on.
CAUTION
Toxic material
Minor or moderate personal injury.
- Wash down the pump before doing any work on it.
DANGER
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.
Complete disassembly instructions are outlined below. Proceed
only as far as required to perform the maintenance work needed.
1. Switch off the power supply.
2. Drain the system.
3. Flush the system, if necessary.
4. For closed coupled units: Remove the motor fixation bolts.
8.3.2 Disassembling the liquid end
1. Remove the pump housing screws (8B).
2. Remove the back pull-out bearing frame (20Y) from the pump
housing (1A).
3. Remove the impeller screw (8A).If necessary, use a strap
wrench around the impeller or shaft to prevent rotation.
WARNING
Moving machine parts
Death or serious personal injury
- Do not insert a screwdriver between the impeller
vanes to prevent rotation.
4. Use an appropriately sized puller aligned behind the impeller
vanes to remove the impeller (3A) from the shaft (6A).
5. Remove the impeller key (12A).
6. Remove the back plate screws (8D). Remove the back plate
(2K) and the seal housing (26P).
7. Place the seal housing on a flat surface and press out the
shaft seal (14A).
8. If the shaft sleeve (5A) requires replacement, heat it evenly to
approximately 350 °F (176 °C) to loosen the thread-locking
fluid. Twist the sleeve off the shaft (6A).
All manuals and user guides at all-guides.com
8.3.3 Disassembling the bearing frame (LFE)
1. Remove the slinger (13G).
2. Remove the lip seal(s) (14S), if any.
3. Remove the bearing housing locking ring (61K).
4. Press or tap on the pump end of the bearing-shaft assembly
5. When one bearing is out, remove the second locking ring
6. Remove the shaft locking ring (61C) and press off the
7. Press new bearings onto the shaft; remember to press only on
8. Assemble the bearing frame in the reverse procedure used for
9. Observe the following when reassembling the bearing frame.
until one bearing is out.
(61F), then remove the complete bearing-shaft assembly from
the bearing housing.
bearings.
the inner race of the bearings while pressing them on.
disassembling.
– Replace the lip seals (14S) if they are worn or damaged.
– Replace the bearings (18A) and (18B) if they are loose,
rough or noisy when rotated.
– Check the shaft (6A) for shaft runout at the sleeve (5A) area.
Maximum permissible runout is 0.002 in. (0.0508 mm) total
indicator runout.
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