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5.4 Disassembly of pumps
Warning
Depending on the product being pumped, the
pump should be washed down before any work is
done on it.
Warning
Observe extreme caution when venting and/or
draining hazardous liquids. Wear protective
clothing in the presence of caustic, corrosive,
volatile, flammable, or hot liquids. DO NOT
breathe toxic vapors. DO NOT allow sparking,
flames, or hot surfaces in vicinity of the
equipment.
Complete disassembly instructions are outlined below. Proceed
only as far as required to perform the maintenance work needed.
1. Turn of power.
2. Drain System. Flush, if necessary.
3. Remove motor hold down bolts.
5.4.1 Disassembly of liquid end
1. Remove casing bolts that attaches the volute to the bracket.
Set volute aside.
Do not insert screwdriver between impeller vanes
to prevent rotation. It may be necessary to use a
Caution
strap wrench around the impeller or shaft to
prevent rotation.
For EB 20503-2:
1. Inspect impeller for anti-reversing set screws.
2.Impeller and set screws will need to be evenly heated to
approximately 350 ºF to loosen locktite.
3. To hold rotating element steady, remove the drip canopy and
fan cover exposing the opposite end of the shaft.
4. Use the proper hand tool required to hold the shaft steady for
impeller removal.
5. Once proper heat has been applied and the shaft can be held
secure, remove impeller.
6. Remove capscrews that fasten the bracket to the motor.
7. Place bracket on flat surface and press out seal seat.
For EB 20501-5:
1. Loosen and remove the impeller capscrew along with impeller
washer.
2. Use approximate size gear puller aligned behind impeller
vanes to remove impeller from shaft.
3. Remove impeller key.
4. Remove capscrews that fasten the bracket to the motor.
5. Place bracket on flat surface and press out seal seat.
6. If shaft sleeves requires replacement, it must be evenly
heated to approximately 350 ºF to loosen locktite.
7. Twist sleeve off shaft.
5.5 Reassembly of pumps
1. All parts should be cleaned before reassembly.
2. Refer to parts list to identify required replacement items
Specify pump serial or catalog number when ordering parts.
3. Reassembly is the reverse of disassembly.
4. Observe the following when reassembling the liquid end:
– All mechanical seal components must be in good condition
or leakage may result. Replacement of complete seal
assembly is recommended.
– New shaft sleeves are installed by bonding to shaft with
hydraulic setting locktite.
5.6 Ordering parts
Grundfos Pumps has over 90 years of experience in the design,
manufacture, and application of centrifugal pumps and pumping
systems. Grundfos's commitment to state-of-the-art pump design
and quality manufacturing assures maximum user benefits with
optimum equipment life at lower cost. Grundfos's commitment to
their customers continues through an extensive service
organization. Highly trained technicians can assist customers
with initial startup, troubleshooting, repair, and system analysis.
To ensure that the proper replacement parts are ordered for your
particular pump model, see the Parts kit section 5.7.
5.7 Parts kit
Pump Model
Seal Kit
EB 20503-2
91909684
EB 20501-5
91910839
Impeller/Wear ring Kit
98351890
98351903
7
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