Model #390251881 Craftsman pump

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Question and Answers

Q:

How do you fix a water leak between the motor and pump housing 390251881 Craftsman Pump

A:

Thank you for your question and I understand your concern.
 
The rusted or pitted shaft should not be causing the leak. The water seal is pressed into the tank body in which the shaft is not touching the seal. One part of the water seal/shaft seal is stationary and the other mating seal in the impeller pressed against the stationary seal to prevent leakage.  Make sure that two seals are installed correctly or it will leak. The sides that must mate should be hard and not rubber side. The ceramic side and the carbon sides must mate or it will leak. Also, be sure to replace the large O-ring too between the two bodies. To not run the pump dry or it can damage the seal. 
 
I added a link to previous question that will provide the instructions for accessing and replacing the shaft seal
 
 I hope this is helpful. If I may be of further assistance as more details become available, please reply to this post. 
 
 

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Joey S -
Sears Technician
May 14, 2013
A:

John: Copy and paste the URL below in your browser and you then you should be able to open it. http://www.managemylife.com/mmh/questions/256814-jet-pump-repair

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Joey S -
Sears Technician
May 14, 2013
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Q:

hi. How do I prime/bleach the well pump: craftman model# 390291658. +model# 390251881. Thanks! my phone#:317-987-0634. email:oceanview6688@yahoo.com.

A:

You are not able to bleach the well from pump. If you need the manual, please use the following link. Manual

The manual will show you how to prime the pump but will not have instructions on bleaching the well. I recommend that you call a local plumber to come out and chlorinate the well for you.

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Mark T -
Sears Technician
August 22, 2010
A:

You are not able to bleach the well from pump. If you need the manual, please use the following link. Manual

The manual will show you how to prime the pump but will not have instructions on bleaching the well. I recommend that you call a local plumber to come out and chlorinate the well for you.

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Mark T -
Sears Technician
August 22, 2010
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Q:

Jet Pump Repair

A:

Thank you for your question.

I can understand wanting to get the pump working after the pipe burst.

It sounds like the slip ring may have been damaged.

I can understand wanting to replace the water seal because of it running with out water to lubricate the seal.

Yes, I agree the you will need to replace the water seal and while you are in their you could put in a impellar,and diffuser and O-ring seal.

You will first need to remove the small tubing from the fitting on the pump head that goes to the pressure switch.

Then remove the screw from the stainless steel band around the pump housing.

The diffuser will be in the front half of the housing.

The impellar unscrews from the motor shaft.

You will then need to slide the front half of the water seal off the motor shaft. Sometimes this can be difficult and it sticks to the shaft. But you can use a pair of slip joint pliers to remove it. Then with a thin small flat bladed screw driver remove the ceramic half of seal from the back pump housing.

Install the new ceramic water seal with a lite coating of lube on the rubber backing to make it easier to press the new ceramic seal into the pump housing.

Then install the front half of the seal with the carbon face against the ceramic face and install the new impellar onto the shaft.

Remove the old diffuser and install the new one and install the new O-ring seal onto the pump housing.

Make sure before you start replacing parts that the pump has been correctly primed and the volume screw is adjusted correctly. If you are having a problem priming the pump try to adjust the water volume screw to the minimum and then after the pump catches open the screw up to get more volume.

Thank you for your question.

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Sam A -
Sears Technician
June 29, 2011

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