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Its so annoying to find Roomba after he's finished cleanin only to see that once again he's lost his brush. How to keep your Roomba from losing his brush- items needed: quick steel putty (local hardware store), crazy glue, original screw (or similar), toothpick, and screwdriver. It seems to be that Roomba loses his brush because the threading in the plastic insert the screw goes attached to gets worn-out, so even when you put the screw back in it'll eventually fall out while he's working. Begin by cutting off a very tiny piece of the putty (follow instructions on package) and stick that into the screw hole. Now that it's filled up, use the toothpick to create a hole inside the plastic screw hole where the screw normally fits. You go will windup taking most of the filler material out as the final fix winds up using very little putty. Let the putty dry per the manufacturer instructions. Once it is dry use the screw to create the new threading in the steel putty. Do this by screwing the screw into the insert slowly backing it in and backing it out a little at a time. Try not to wobble the screw as you do this. Once you get a good fit take the screw back out, now it's time to put the brush back in. Put in a couple of drops of crazy glue in the hole and put the brush and screw back in. Let it dry for at least overnight just to be sure. And that's it! If you're not very hands-on it might be better to let somebody else do it for you, you don't want to get the steel putty or crazy glue into any of the moving parts and then ruin the assembly.
The drive belt may have just melted a notch into the rubber on the motor piston. With the cover off, are you able to move the brushes by hand? When the brush bar turns, does the drive belt move too? If so, move it for a full rotation of the belt (make a mark with a Sharpie and move it until you see your mark again)
If there's a melted notch or "Dent" in the belt, you'll need to replace it
The U6311-903 is a self propelled vacuum. The the small red button will stop the handle from moving back and forth, which makes the machine go foward and backwards. The red button disengages the self propelled feature.
I think it's a spring that goes on the bag holder itself... You have to sort of pop the bag holder up from it's hinges and see a little tab stick on the bottom, in the middle, pointing sideways. There's a little groove that the spring is supposed to line up with on one side, and if it's not in that place you put the spring on backwards and have to turn it around the other way so the end lines up. Then snap the holder back in, and make sure the spring is pushing against the vacuum so when it's in place, the holder pushes the bag up towards the lid. The spring is to keep the bag pressed up to the air intake, and doesn't push down very much.
with the vacuum in the upright position push the handle foward then reach foward and slide the lever to the proper position that also works to ingauge the power drive or to release the handle thanks hope this helps Don the Vacuum Doctor Alb N.M.
I have takin several Roombas apart with this problem. Basically the sensors on the bumber are blocked so the roomba thinks it is hitting something. I believe this is a design problem because it is so common. If you could see how the bumbers work, there is an infrared sending unit and an infrared receiving unit (they look like little LED's. when the bumper is pressed, a plastic piece moves between the two infrared led's blocking the transmission. This signals roomba to stop and backup. What happens over time is the sending led thing gets dislodged and moves slightly. The receiving led can't sense the signal so it thinks the bumper is depressed.
Hard to explain, but I have fixed the problem by shimming the led back in place and worst case, I drilled the hole in the plastic piece a little larger. Solved the problem and I have recaimed several roombas that were considered scrap. Irobot should fess up to this known problem and issue a fix for everyone of the defective units.
There is a cable that connects to the handle and goes down to the powerdrive transmission. It is visible at the actuator arm on the drive if you look at the bottom of the handle where it pivots on the main housing. It will be on the right hand side, front corner of the handle bottom. You should be able to see the cable connected to the arm of the drive and will move back and forth with the top handle. Sometimes, they break at this connection. The cable may be frayed and broken, or the acuator arm may be broken where the cable connects.
This could also be a simple worn belt problem. The roller is always rotating in a direction that pulls the machine forward and if the belt is worn, the roller will turn sluggishly but still enough to pull forward, but the belt also drives the transmission and a worn belt will not have the capacity to overcome the forces involved to propel the machine backwards. Always change the belt(s) yearly.(on average)