Sears 390.2521 Disassembly Assembly of Pump, Removing Motor for Service Replacing Shaft Seal

Page 9

MAINTENANCE

DISASSEMBLY AND

ASSEMBLY OF PUMP

AWARNING] Risk of electric shock. Ground unit and

disconnect power before attempting any work on pump or motor.

Your Sears pmlap is designed for ease in servicing. Should

repair or replacement of the motor or seal be needed, the

pump and piping do not need to be disconnected or dis- turbed.

1.Disassemble pump as follows:

A.Disconnect power.

B.Drain pump by opening drain cock. Remove pressure switch tubing from fitting on top of pump.

[A WARNING ]To

avoid

serious

injury,

release

aH

pressure

 

from

 

system

before

attempting

to

remove

clamp

from

pump.

 

 

 

 

 

C. Remove

clamp, Key

No. 10, Page 12.

 

 

 

D. Remove

pump

base

mounting

bolts. Motor

assembly

and back half assembly of pump can be pulled away

from

front

half.

 

 

 

 

 

E. Remove

"O"

rings.

 

 

 

 

 

2.Reassembly of pump.

A. Clean "O" rings and "O" ring grooves.

B.Lubricate "O" rings with petroleum jelly, and place in grooves.

C.Slide pump halves together.

D.Clean inside of clamp. Place clamp around pump halves. Alternately tighten clamp screw and tap clamp around outside with plastic mallet. This will insure proper seating of "O" ring and clamp.

E. Assemble base mounting bolts. Connect pressure switch tubing and close drain cock.

F. Prime pump and tttm on power.

G.Check for leaks.

screwdrivers between the back purnp half and the motor flange. This will force rotating portion of seal off shaft. See Figure 7.

)

475 0194

Figure 7

4.Place back haft of pump on flat surface and tap out ce- ramic seat. See Figure 8.

Removing Motor for Service

and Replacing Shaft Seal

If it is necessary to separate motor and seal plate, always re-

place the shaft seal. We suggest you purchase this item, U109-6A, and have it on hand for future use.

NOTICE: The seal consists of two parts, a rotating member and a ceramic seat. The surfaces of the seal are easily dam-

aged. Read instructions carefully.

1. Disassemble pump per instructions above.

2.Remove diffuser and impeller as follows (Key Nos. 8 and 9, Page 12).

A. Remove screws holding diffuser.

B.Loosen two screws and remove motor canopy from motor.

C.Place 7/16" open end wrench on motor shaft flat.

D.Turn impeller counterclockwise when facing it.

3.Remove pump back half from motor by unscrewing four

(4) nuts. Pry back half off motor by inserting two (2)

479 0_94

Figure 8

5.Clean seal cavity.

6.Install new seal.

A.Clean polished surface of ceramic seat with clean cloth.

9

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Contents Sears Read and Follow Safety Instructions ContentsintroductionMajor Components What They Basic Tools and Materials NeededPiping in the Well InstallationPump Horizontal Piping from Well to PumpTo Check Tank Air Charge Tank41-1/22 Discharge Pipe SizesElectrical Motor Switch SettingsDial Type Voltage Selector Remove Motor End CoverOperation Recommended Wire and Fuse SizesMaintenance Removing Motor for Service Replacing Shaft Seal Disassembly Assembly of PumpCleaning Impeller Maintenance / Helpful HintsHow to Handle a Gaseous Well Cleaning Shallow Well JetTrouble Troubleshooting GuidePump Only- Model Repair PartsPart Description Key ModelModel Key Qty Part Number Used Description Repair PartsPage For the repair or replacementpartsyou need Forin-homemajor brandrepair serviceForthe locationof a SearsRepairServiceCenterin yourarea

390.2521 specifications

The Sears 390.2521 is a notable addition to the world of household appliances, particularly recognized for its versatility and user-friendly design. This multi-functional device is primarily known as a microwave oven, making it a staple in many kitchens. With its compact build and efficient performance, the 390.2521 caters to various cooking needs, from heating leftovers to preparing entire meals.

One of the main features of the Sears 390.2521 is its powerful microwave generator, which typically operates at a wattage of around 900 watts. This ensures that food heats evenly and efficiently, reducing cooking time and energy consumption. The model's sleek design includes a spacious interior that can accommodate large dishes, making it suitable for family meals or batch cooking.

The 390.2521 comes equipped with a variety of cooking presets, allowing users to quickly select the appropriate settings for different types of food. These presets include options for popcorn, pizza, and beverages, among others. The intuitive control panel is designed for ease of use, featuring soft-touch buttons and a digital display that clearly indicates cooking times and power levels.

In terms of safety features, the Sears 390.2521 includes a child lock function to prevent accidental operation, making it a trustworthy option for families with young children. Additionally, the appliance is fitted with an automatic shut-off system, which activates at the end of the cooking cycle to prevent overheating and ensure safe use.

Technologically, the 390.2521 leverages the latest advancements in microwave technology. Its sleek interior design is easy to clean, thanks to a non-stick coating that resists food buildup. The turntable feature ensures even cooking by rotating food for optimal heat distribution, which is particularly beneficial when reheating or defrosting.

Another noteworthy characteristic of the Sears 390.2521 is its energy efficiency. The appliance is designed to minimize energy consumption, which is an essential consideration for environmentally conscious consumers. Its compact size also makes it easy to fit into various kitchen layouts, offering both functionality and aesthetic appeal.

In conclusion, the Sears 390.2521 microwave oven stands out in the competitive kitchen appliance market due to its combination of power, safety features, and user-centric design. Whether for quick heating, defrosting, or cooking, this model serves as a reliable and stylish option for any modern kitchen, making meal preparation faster and more convenient.
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