mp40w freezing up
- Thread starter tor101898
- Start date
EcoTech Marine
.Registered Member
I think you likely put the wet side back together wrong. The most important thing to check is that the bearing sits flush with the surface of the wet frame. Here's a video which shows the re-assembly of the wet side pretty well:
http://www.youtube.com/watch?v=sYGqezWzKBU
-Tim
http://www.youtube.com/watch?v=sYGqezWzKBU
-Tim
Todd March
Premium Member
I've had this problem too; I narrowed it down to the drive shaft nut. It has a "sweet spot" of tightness the user must find to ensure it will allow the propeller to spin correctly and start the pump up, and I'm still not sure what that "sweet spot" is...?
If you tighten the nut too tight, the drive shaft seizes up and the propeller won't turn... If you only loosely attach the drive shaft nut, it tightens up and the drive shift seizes and the propeller won't turn... I took the unit apart and reapplied the drive shaft nut ten times before it finally found its sweet spot and the pump then worked perfectly...
I saw that you, Tim, posted in another thread that the drive shaft nut only needs to be hand tightened, but if I do that it does not work for me. The sweet spot seems to be fairly loose, yet lightly tight, and I am still not sure where that "sweet spot" is...?!
I just keep hoping that everything keeps going well for some time and I don't need disassemble and reassemble the unit any time soon. I don't look forward to finding that "sweet spot" and messing with that nut again...!
In the manual the drive shaft seems to have ridges that fit into the back of the propeller, but my unit does NOT have this--the propeller and the drive shaft just connect flush on the drive shaft screw. I think the ridges look like a good idea, as it would ensure that the propeller is forced to spin...?
If you tighten the nut too tight, the drive shaft seizes up and the propeller won't turn... If you only loosely attach the drive shaft nut, it tightens up and the drive shift seizes and the propeller won't turn... I took the unit apart and reapplied the drive shaft nut ten times before it finally found its sweet spot and the pump then worked perfectly...
I saw that you, Tim, posted in another thread that the drive shaft nut only needs to be hand tightened, but if I do that it does not work for me. The sweet spot seems to be fairly loose, yet lightly tight, and I am still not sure where that "sweet spot" is...?!
I just keep hoping that everything keeps going well for some time and I don't need disassemble and reassemble the unit any time soon. I don't look forward to finding that "sweet spot" and messing with that nut again...!
In the manual the drive shaft seems to have ridges that fit into the back of the propeller, but my unit does NOT have this--the propeller and the drive shaft just connect flush on the drive shaft screw. I think the ridges look like a good idea, as it would ensure that the propeller is forced to spin...?
EcoTech Marine
.Registered Member
When the wet side is assembled properly the tightness of the nut does not affect its operation. The nut simply holds all the parts in place and the geometry of each part determines the overall fit and function.
The two most common issues that people have leading to wet sides not working after re-assembly is the omission of the washer which goes behind the magnet or re-installing the ceramic wet bearing so that it does not engage with the teeth in the wet frame and so is not flush with the surface of the wet frame.
By far the latter is the most common.
Todd- the ridges at the top of the drive shaft were from pumps about two years ago. They no longer feature this as it is unnecessary. The nut holds everything together tightly.
-Tim
The two most common issues that people have leading to wet sides not working after re-assembly is the omission of the washer which goes behind the magnet or re-installing the ceramic wet bearing so that it does not engage with the teeth in the wet frame and so is not flush with the surface of the wet frame.
By far the latter is the most common.
Todd- the ridges at the top of the drive shaft were from pumps about two years ago. They no longer feature this as it is unnecessary. The nut holds everything together tightly.
-Tim
Todd March
Premium Member
Thanks, Tim, I will print this out so that I can figure out what I am doing wrong the next time I take the unit apart...!
Todd
Todd
