I purchased my SmartScoop earlier this year. There are posts with me lauding and praising it elsewhere in this forum.
I followed the others here and requested and recieved an upgrade kit shortly after. It worked great - for a while. Then the motor started having trouble moving forward. It would make a POP noise as it approached the front of the box, and would go too far forward, pushing the rake into the front of the box and making it unable to lift the rake up.
Here's what I believe happened. At the time I received my upgrade, I had a littertrained rabbit who would spend a lot of time in the box. He was 8 years old and basically failing. The automatic rake would approach him, and instead of hopping out of the box when the rake touched him, he'd stubbornly remain. But instead of backing off, the new stronger motor would try to force him out of the box. Eventually, I believe this put strain on the plastic gearing that makes the rake go upwards, and either threw the teeth/cogs out of alignment and off-timing, or broke the same. I put my original motor back on.
I contacted SmartScoop about this a few weeks ago. April, their rep, asked me a few questions. I was getting a little frustrated as she kept repeating that the rake safety door/latch has to be closed to ensure proper operation. I'm not an idiot. Once I set up the box that latch was closed and there was no reason to open it. And once this problem developed, that's one of the first things I checked.
She asked if there was a sticker on the inside of the replacement motor. Initially I said no. She said that somehow I'd been sent an older, less powerful motor with the upgrade, and sent me another new one.
I set that up about 2 weeks ago. And then 2 days ago, the same problem developed. I had to have my bunny put to sleep a month or so ago, so he was no longer a factor. But I think the same thing happened, but with either a cat who didn't get out of the box quick enough, or some "just right" litter pile-up at the front of the box.
I contacted April again. I told her about this. Once again, her response was to tell me that this happens when the rake safety door/latch isn't closed. Grrr... In any case, they'll send me a new motor again, but now I have to pay shipping which is appx. $6.00. I'm willing to do so because I believe in this product after having struggled with LitterMaids for years.
I did send another response to her today telling her of my suspicion that I removed that sticker when I first set the box up and that the first failing motor was the more powerful one. I also told her my theory as to why the more powerful motor is failing. I believe it's a design flaw (as bad as the LitterMaids were, at least when they reached an obstruction, they BACKED OFF). I haven't heard back from her yet.
I still love this box. When the new motor is functioning properly, it's perfect. I just hope they take me seriously and look at this obvious design flaw.

