MAGNUM POOL PUMP 1-1/2 HP MAGNUM PUMP BY: how do i replace the shaft seal...

How long from the last working of that pump?
Was the Pump stored? unused?
Disassembly and try to make turns the shaft and see if it is Blocked.maybe the bearings are with water and it is rusted.
If the bearings are rusted, the mechanic seal is damaged,you need to change it and the bearings.

This sounds like it could be the shaft seals, which is a cheap fix.
The Jacuzzi Magnum calls for seal 35-423-1021
You might consider replacing the seal plate O-Ring as well. - 35-105-1120

Hi,
If you haven't already figured out how to change the seals on your Jacuzzi Magnum Force pump, I can help by supplying a diagram.
Here is the parts explosion for that pump.
Start by removing the case/basket assembly, then the diffuser to get to the impeller. Loosen the impeller to get to the seal plate.
When going to the trouble of changing the shaft seals one should change all the hosing seals at the same time because its a lot of work.

Thank you for posting your question here on Fixya.com.

Yes, the seal has been leaking and it needs to be replaced; probably the motor bearings too.

Removing the impeller requires you lock the shaft as you turn the impeller off counter-clockwise. To lock the impeller you will have to remove the motor end cover or a cap covering the shaft end depending on which version your particular motor has. Look at the end opposite the pump and imagine a shaft from one end to the other right in the center.

Once you remove the cover you will see a slot for a screwdriver, a flat for a wrench, a hex hole for a hex key or some combination of these. Lock the shaft and spin off the impeller. Some are so tight you will end up breaking them in the process. Simply replace it and the seal. Be sure the motor shaft is in good enough condition to allow the new seal to work properly. If too much shaft material has rotted away the new seal will leak soon after it is installed; you would need a new motor at that point.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. You may also contact me thru our website at www.arrowpools.net. Positive feedback is appreciated once your problem is solved!

John

looking at he face of the impeller turn counter clockwise, with a large set of CHANNELLOCK 20" Pliers Channel Lock Model 480 cost about $70.00 there is a notch on the back of the motor shaft for ether a 1/2 or 7/16 open end wrench to fit in to hold the rotor from turning. warning ! these pumps are hard to find parts for so you want to have the right tool so you don't break anything. your best bet is to bring it to your local pool pump motor repair guy and have him do it, if its just the seal you are trying to replace it should be a $20 job
if'n i was any help vote ... thanks ..jay .. and prime the pump after a repair !

The impeller is threaded onto the end of the motor shaft and the housing (pump body) is attached to the motor with the same bolts that hold the rear cover on the motor they run all the way through on most pumps.

WELL LET ME SAVE YOU FROM THAT JACCUZI .. GET RID OF IT, GET A STA-RITE DURA GLASS.. PARTS ARE HARD TO FIND FOR JACCUZI.. BUT IF YOU LIKE PAIN, YOU MIGHT GET THE LID O-RING AND THE SHAFT SEAL FROM YOUR LOCAL POOL STORE. ASK HOW TO REPLACE THE SEAL AND DO IT RIGHT.. PRIME PUMP AFTER A REPAIR! VOTE IF I WAS HELP ...J

alot of companies use to have a damper ring on pump shaft which would knock down some of the noise a pump motor made pumps make noise and the bigger the pump the louder the noise if its not vibrating or clunking then its running as it should

you need to replace the shaft seal.

You need a 201 seal for the pump. Most electric motor shops that work on pumps and of course pool store carry these. If you are unfamiliar with how to change the seal, the charges to have it done are usually low. We charge $15 - $30 depending on how much of the pump is brought in and therefore remains to be taken apart to replace the seal. The seal is about a $5 item.

If trying yourself, you will need to completely disassemble the pump, lock the motor shaft at the rear of the unit, spin off the impeller, and replace both halfs of the seal.