I have a Neato D7 and it appears the hex nut on main motor has rounded the edges and does not engage the main brush anymore.
Is there a replacement nut? Preferably a steel one instead of plastic?
Mike
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Hi @mdblack98!
Thank you for contacting RobotShop.
Can you give us a photo of the damaged part?
Did you maybe buy your robot from RobotShop?
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Hi Mike,
Thank you for your reply.
We have an information from our technician that it is necessary to change the complete main brush motor.
Have you bought your robot from RobotShop?
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I have this same problem and no we didn’t buy it from where ever was referenced. Is there a replacement part or do we have to buy a whole new vacuum?
It’s not the brush that needs to be replaced. Brush works just fine and the socket for the 7mm plastic hex nut is not worn at all. It’s the plastic end of the geared rotor that gets worn down when it hits carpet runner and gets a sudden jerk on the brush. I’ve got the stuff now to epoxy a 7mm nut on the end of the rotor that should solve the problem permanently if the epoxy holds.
Part is available here. I ordered it 6 weeks ago and it still hasn’t made it’s way to my house in the USA…I had to replace the whole motor assembly for now.
Mike
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Hi Mike
I have the same problem as you with your D7. Did you have any joy with epoxy resining the m7 nut to the gear?
REgards
Matthew
Haven’t done the epoxy test yet. It’s still on my todo list. I did replace the motor though that had a new nut on it.
I also wrote a letter to Neato but never heard anything them. Asked that they put the needed part on their website.
Mike
Same issue with D7 and rounded hexagonal drive for the brush.
I’ve fixed it temporarily with some dual-walled heat shrink (the kind with glue on the inside) and a quick zap with a butane heat pencil. It should be good for months - we’ve got two D7’s and they’re great, but I’d prefer not to chuck a perfectly good motor into landfill just to replace the drive.
Both D7’s are 18 months old… the one which failed does hardwood floors with rugs so I"m guessing the shock of hitting the rug is what’s caused the hex drive to round out.
A 3d print might do the trick?
Rounded cornershere too. Can’t find replacement gear or even a new motor. Was thinking of heating the gear tip with a heat gun and pressing it into a hex end of the brush to reshape it. Maybe shoot a bit of wd40 into the hex to ensure I can pull it back out.
Anyone find a solution yet?
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I posted this link earlier
The nut is mostly hollow – has some ribs on the inside for structural support.
I still have an idea to epoxy an M7 nut after slicing off the rounded nut.
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I was looking for a nut to do the same. Thanks for the size. You made me think. Shave off the top, screw in a 7M headed bolt. Epoxy the threads.
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A bolt won’t work – there’s a metal spindle inside that unit – the nut actually “sits” on the spindle with a ribbed center post inside the nut - kind of like a hat with a ribbed insert.
Next time I decide to attack this was going to try epoxying a new nut after slicing off the old one. The spindle may sit nicely inside the threads…if it doesn’t was going to try a thin metal plate under the nut. I’ll have 2 spindles to play with next time I need to do this.
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I have a heat “pencil” with a wide flat tip. I pressed the gear tip making circular motions and quickly pressed the brush in place. Viola! It was a tight fit and had to grind away some of the pressed out material, but the brush is spinning again. Bot is at work! Much nicer job with a spinng brush.
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Nice solution 
Maybe I am late to the party, but I had exactly the same problem with my wife’s Neato D3, and I made a replacement part out of harder PLA plastic. If you are having this problem, I can sell you a replacement gear here:
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