pictures! Note the disassembled motor: there are shims that sit between planes of the planetary gears (they look like large washers). There is a circlip that holds the output shaft in place on the threaded brass bushing. Note that there is nothing that is preventing the disassembly, other than glue on the plastic nut. The glue failed after just 2-3 minutes with a hairdryer. Note the bearing, 698Z. It is in perfect shape -- the planetary gears take all the load off this bearing. It spins very slowly after the motor speed is reduced. It should not fail unless it is wet.
Now the interesting part: the wear on the outer planetary gears (the second level of gearing that is closest to the output shaft) and the carrier -- look how much slop there is! Note also that the teeth should not be pointed. The teeth in the ring gear are squared off like they should be. In general, I'd say the inner planetary gears are in great shape. The outer gears are reamed out a little (one is huge, compared to the others) and the carrier is completely shot. I'm not even sure how the little pins are still attached. There is almost nothing left of them.
I don't know if it's possible to source these parts from somewhere. I'm 99% sure they were not cast specifically for Maytronics. They reduce the speed of the motor considerably -- I think 1 gear reduces the speed by somewhere around 30%.
BTW, I just reassembled the motor without the shims. It was the only way I could get it to spin freely without binding. I think it creates just enough space for the worn gears to slop around without getting caught. I tried multiple things -- letting the gears float in some motor oil, some wheel bearing grease, some lithium all purpose grease -- none of it helped reduce the binding. On a whim I left out one shim, and then both. My gears are only very lightly lubricated. I can spin the motor in both directions, assembled, with my fingers holding the output shaft now. This should last me a while -- I'm thinking 2-3 days, but hoping for a week or 2!!!
Now the interesting part: the wear on the outer planetary gears (the second level of gearing that is closest to the output shaft) and the carrier -- look how much slop there is! Note also that the teeth should not be pointed. The teeth in the ring gear are squared off like they should be. In general, I'd say the inner planetary gears are in great shape. The outer gears are reamed out a little (one is huge, compared to the others) and the carrier is completely shot. I'm not even sure how the little pins are still attached. There is almost nothing left of them.
I don't know if it's possible to source these parts from somewhere. I'm 99% sure they were not cast specifically for Maytronics. They reduce the speed of the motor considerably -- I think 1 gear reduces the speed by somewhere around 30%.
BTW, I just reassembled the motor without the shims. It was the only way I could get it to spin freely without binding. I think it creates just enough space for the worn gears to slop around without getting caught. I tried multiple things -- letting the gears float in some motor oil, some wheel bearing grease, some lithium all purpose grease -- none of it helped reduce the binding. On a whim I left out one shim, and then both. My gears are only very lightly lubricated. I can spin the motor in both directions, assembled, with my fingers holding the output shaft now. This should last me a while -- I'm thinking 2-3 days, but hoping for a week or 2!!!
