Roomba 870 will not dock after changing brush spinning motor

SOURCE: Brushes not spinning....

My status light came on, the vac beeped twice and stopped. I noticed my brushes weren't spinning. I took an eyeglass screwdriver and took off the center screw that holds on the brushes. I cleaned the shaft that the brushes spin on. replaced brushes and it works great! I just did this now and it is still running. my status light problem is fixed my roomba is 4 years old and I am on my 2nd battery. Seems to have fixed the problem. FYI it was wrapped with hair, dirt and it was greasy.

SOURCE: Roomba Discovery

I read somewhere that you need to clear the software in case there is a glitch. To do this, take the battery out and then, simultaneously hold down the "spot" and "clean" buttons for 30 seconds. Replace battery. This has worked for my Discovery model.

SOURCE: Brushes are clean, but Roomba stops and says clean brushes

I decided to take it apart and see if I could fix it because even if something inside went "SPROING" and I couldn't get it back together, it wouldn't be any worse than it was already.

FIrst, remove the dust bin part and the brushes. Then, there are four screws on the bottom gray panel which have to be removed first in order to get to the gears which hold the brushes. I did not remove the little sweeper brush on the front, but I just slide it through the hole in the gray panel.

Then in order to get out the orange section which actually holds the brushes, there are four screws which must be removed. The orange section is attached to a blue section. This entire unit comes out by sliding it toward the area where the dust bin goes, being careful not to tear the light gray rubber gasket which covers the side.

Once that section is removed, there are two screws on each side. These screws hold the orange thing to the blue thing. Once the screws are removed, lift up only the side which has the white squares into which the brushes are inserted. These are actually the back side of little gears. There is a face plate on the outside of the orange part on this end. The other end contains a bunch of wires and I was careful not to disconnect any of them.

The face plate has six screws which must all be removed. Use caution when removing the face plate. Hold it up so that all of the stuff doesn't fall out. It has a bunch of gears, little brass looking fittings and grease. Take care to only remove the gears which have the squares which hold the brushes AND do it one at a time unless you like working jigsaw puzzles. I used tweezers and a pin to clean the "gunk" consisting of hair, fuzz, etc., out of the little gears.

Reverse the process to put it back together. Hazel, my little Roomba, played me a happy little song and immediately went back to work. She seems as good as new.

SOURCE: Roomba brushes won't spin

I had this problem with my Roomba Discovery. I ran across your question while searching for an answer. My main symptoms were, Roomba hesitated a lot, and the dust bin did not fill. I had plenty of hair wrapped around the brushes and against the filter.
I just finished taking my Roomba apart. I found the motor drive shaft had a LOT of hair wrapped around it and it had climkbed into my gearbox. I took that apart and cleaned all the hair out of the gearbox. My Roomba is back to normal now, filling the dust bin.

SOURCE: My Roomba 560 does not automatically dock as advertised either..

You may not believe this, but the new 500 series lighthouse virtual walls have both infrared and radio frequency communication. How they work and associate with the Roomba is pretty complicated. The best posting I've ever seen about how they work is here:
http://www.robotreviews.com/chat/viewtopic.php?f=1&t=11048

Check out that link to understand how the communication works.

If your Roomba is contained by the virtual walls, then you can assume the IR sensor on your Roomba us good....you should test that though. Then you might have to replace the "home base" which could have a bad IR transponder . New ones can be found for reasonable price at www.RoboticVacParts.com or you could order straight from iRobot for twice the price.

If the Roomba is not contained by the virtual walls, then the IR sensor on the Roomba is likely bad and you'll need to change the bumper on your Roomba. Again ....parts are available through ebay, or www.RoboticVacParts.com. Follow this link if you need it.
http://cgi.ebay.com/NEW-Roomba-500-series-white-bumper-510-530-532_W0QQitemZ270400281066QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3ef51cd9ea&_trksid=p4634.c0.m14.l1262&_trkparms=|301%3A1|293%3A1|294%3A30