recently the main brush motor stopped spinning so i opened it up to replace the motor. i have now bought 3 different replacement motors that say they are for the T8 or 8x. but none of them fit correctly. i have searched like crazy but can not for the life of my find my motor anywhere online. (pictures below) am i crazy? are these no longer in production? is one of the other motors supposed to fit even though the L shape is wrong? your wisdom is appreciated.

ok so with some inspiration from oldturkey03 i think im close. im going to walk through what i did if anyone else is ballzie enough to try this.

so i decided i was going to transfer the old L drive shaft to the new motor. i started by unclipping the snaps around the perimeter (picture1).

once inside i cleaned all the gears as they were very full of dirty grease (picture2).

i then removed the two screws on the left side of the image (picture3) (this is where the motor attaches) and screwed in the new motor.

but as i put it back together i realized that the gear attached to the new motor was beveled to the left but all the old gears were beveled to the right! so i pried the motor gear off of the old motor and transferred it to the new one. (be careful when prying off it toke a lot of force and mine ended up half way across the room in my white shag carpet. much cussing ensued.)

ive got all the pieces together and clean now i guess the last thing i need is to figure out what kind of lubricant to use on the gears. any ideas?

⟐ Edited by author 6월 18, 2026 at 16:20 GMT-7

Turned out it stopped working a while ago.

When I got it back I started to diagnose it.

The first thing I noticed was, when it's docked in the charginstation, it turns on and I can adopt it into the smart things app. The battery read 0% and no matter how long it charges it wouldn't go up.

So I started by disassembling the battery down to its individual cells. Turned out 5 out if 6 cells were completely dead (absolute 0 volts).

So I ordered some new cells and put the battery back together. The battery now shows 21,7 volts. But it still doesn't want to run outside the chargingstation.

When I use a multimeter on the battery, while it's connected to the chargingstation it shows about 25 volts on d+ to d- (the plugs from the vacuum to the PCB on the battery). And still 21,7 volts on b+ to b- (the spot welded tin to the battery). It has now charged for about 2 hours and it's still about 37% charged (so not getting charged).

I've tried to put the PCB under an thermal camera to see if anything gets hot, but it doesn't. Even with it plugged into the chargingstation, without the chargingstation or it disconnected from the robot. I've also tried to connect 21 volts 1 a with a powersupply connected both on d+ to d- and on b+ to b-, yet nothing gets hot.

Anyone have any idea on how I could fix this?

I'm pretty new to this stuff, but I do watch some youtubers like NorthridgeFix and TronicFix so I have some general idea.

Should I disconnect the cells again and maybe try injecting voltage over some of the chips on the PCB or check the resistance on some of the caps? If so i would love some guidence. I don't have a chip programmer yet, but I will order one sooner or later, if needed.

Image of the PCB here:

https://imgur.com/a/eqJpynu

I'm also working on a guide on the disassembly of the batter here (ask and ill add you in order to view):

Disassembling Samsung Vacuum Battery VCA-RBT80 VR30T80313W/WA

⟐ Commented 6월 16, 2026 at 3:16 GMT-7

⟐ Answer edited 6월 14, 2026 at 17:49 GMT-7

⟐ Marked as duplicate 6월 13, 2026 at 22:59 GMT-7

I have cleaned all parts

⟐ Marked as duplicate 6월 13, 2026 at 22:59 GMT-7

⟐ Answered 6월 13, 2026 at 19:26 GMT-7

⟐ Commented 6월 10, 2026 at 11:29 GMT-7

Anyone have pinout connector main brush motor box of irobot roomba 5xx/6xx?

⟐ Commented 6월 09, 2026 at 9:08 GMT-7

⟐ Commented 6월 09, 2026 at 4:07 GMT-7

⟐ Commented 6월 08, 2026 at 14:42 GMT-7

⟐ Answered 6월 08, 2026 at 13:02 GMT-7

⟐ Answer accepted 6월 03, 2026 at 16:43 GMT-7

⟐ Commented 6월 02, 2026 at 19:50 GMT-7