Water is leaking from the ceramic shaft seal on my Grundfos JP5 pump. Is it possible to order and replace the seal on a do it yourself (DIY) basis? Is the shaft seal pressed in? If the seal is leaking, is it possible the shaft has been damaged as well? Is it better to just replace the whole pump-motor assembly? Thank you in advance.
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replace the pump seal
there is a bellows type carbon on ceramic seal that over time the rubber cracks , or if run without water will damage the carbon seal surface on the ceramic base
any pump or irrigation shop can affect the repair
The seal is a2 part assembly.
Stop the shaft from spinning first!
Then get a good hold of the impeller, maybe with a pair of pliers?water pump pliers. Then spin off counter clockwise. Regular thread direction.
Once off, shaft seal will be accessible.
No . the problem is that the ceramic seal that seals between the fluid and the motor and bearings is leaking ( probably from running dry) or the rubber that holds the carbon seal insert has a crack. Suggest you pull the pump down to fix it otherwise the water/ fluid will get into the bearing of the motor and will cause a major failure
I would reccomend replacing both water pump shaft bearings and also the shaft if there is any sign of grooving on the shaft. Without looking at a diagram i am assuming that the water side of this bikes pump is a mechanical(ceramic) seal design . Sucessful replacement of these mechanical seals can be tricky. A few tips are: be certain that all case surface areas are clean with all old seal/sealing debris removed such as with sccotch brite. So that the seal will seat and seal properly in the case. NEVER allow your dirty/oily fingertips to touch either of the ceramic pieces of the seal in the contact area. Lubricate these ceramic pieces with a standard green type of coolant only upon assembly. Always use a regular green type of coolant in the system untill you are confident of the install and then change to another type if you are going to. Be aware that it is not uncommon for the mechanical(ceramic) type of seal to weep slightly during initial break in as the two halves seat to each other. This weepage should dissappear in a short period of running time.
The shaft seal more likely than not needs to be replaced. If your shaft seal has been leaking for any length of time, the bearings could be damaged and this should be replaced. The whisperflow uses a PS1000 shaft seal and is fairly easy to replace (most seals available online or at most swimming pool retail stores). It is best advised not to run the pump until you have had this inspected by a licensed pool technician or have changed out the seal.
1) Make sure breaker/power to pump is off. 2) Remove the six bolts holding the wet end to the seal plate. 3) Remove the diffuser to expose the impeller. 4) Remove the screw in the middle of the impeller by turning clockwise (left hand threads). 5) Remove the dust cap at the rear of the motor and use a wrench to hold the shaft while you remove the impeller by turning counterclockwise. 6) Once the impeller is off, remove the four bolts holding the seal plate to the motor. 7) Press the old seal out of the seal plate and clean it thoroughly. Remove the ceramic part of the seal from the impeller and clean it thoroughly as well. 8) Apply a thin coat of lube (I prefer Magic Lube or Lube Tube) to the seal plate and impeller where the new seal will go. 9) Remove the new PS1000 shaft seal from the box (being careful *NOT* to touch the ceramic or carbon face with your fingers), press the metal part into the seal plate carefully, try not to bend the metal and make sure its completely seated against the seal plate. 10) You can now install the seal plate back onto the motor and secure with four bolts. Press the ceramic part into the impeller, use cardboard or paper between your fingers and the ceramic face.11) Once you have seated the seal into the impeller, hold the motor shaft and thread the impeller on until snug, then reinstall the stainless screw, remember it is left hand thread so you'll have to turn it counterclockwise. 12) Reinstall the diffuser over the impeller and then install the wet end onto the seal plate using the six bolts, don't overtighten them. Check the pump for operation and you should be good to go!
Replacing a shaft seal requires some good mechanical ability. first, always make sure power is off at the breaker before you work. You'll have to remove the band holding the wet end to the seal plate. Then remove the diffuser covering the impeller. Remove the cover on the back of the motor. You either need a 7/16 open end wrench or a armature tool to hold the motor shaft while you unthread the impeller (if the impeller has a screw in the middle, you will have to remove it by turning clockwise, left hand threads) counterclockwise. You can then pull the carbon part of the seal off of the impeller, make sure to remove all of it including the metal sleeve. You will then have to remove the seal plate and push the ceramic part out from the back. You can then clean and lube the seal plate and install the new ceramic part of the seal, try not to touch the ceramic with your hands if possible. You can then lightly lube the impeller shaft and slide the carbon part of the seal with the carbon facing toward the ceramic as you thread it on. If the seal plate had a copper heat sink, you can either replace it or use a different size seal. (I believe it's a PS-201) Re-install the seal plate, impeller (and screw if applicable) and diffuser. You should now be ready to mate the seal plate to the wet end. Make sure you fill the pump before you try starting it up, especially with a new (dry) seal.
This sounds like you have a bad seal in your pump and the loose piece is probally a piece on the shaft of the motor called a water slinger. This is just there in case your seal goes bad and leaks water it will spin with the motor and sling the leaking water out and away from the motor so a small leak does not ruin your motor. But you will still need to replace your seal and "O" ring.