5XX Side brush stripped screw solution

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5XX Side brush stripped screw solution

Postby vic7767 » November 2nd, 2007, 2:05 pm

OK, so I was just removing the side brush on the model 535, (Must do after each run), removed the debris underneath, installed the brush, placed the small screw in the center of the side brush shaft, began to apply a small amount of torque, guess what ?

A portion of the plastic at the very tip of the side brush shaft broke off. This became the excuse I needed to retrofit the side brush assembly to add a 4-40 brass solution. Observe the picture:
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Postby fancyfreewv » November 2nd, 2007, 2:11 pm

Well I like that nice neat solution - voided warranty or not. I think not as if this part went, they would just ship you a "module" anyway so would not ever know that you had modified it.

BTW, if I ever wanted to buy these, is this the same size as you use all over for screw/plastic modification?
Nancy - Mom to 3 Furbabies - Bentley, Chelsea, Whiskey & 3 Roombas - 535 (Half Trax) and 560 (Shadow) and Dirt Dog (Old Yellow)
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Postby vic7767 » November 2nd, 2007, 2:58 pm

fancyfreewv, you're very observant. Yes the brass replacement solution used here is the identical hardware that I use to perform the complete screw replacement process on most of my Roombas and Scoobas. The 535 is not exempt and as you can tell from other hacks posted on the forums, I'm not concerned about warranties. :lol: :lol:

Here's the brush installed:
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Postby fancyfreewv » November 2nd, 2007, 3:14 pm

It looks like a standard Allen screw. Also are all the screws the same length all over your modifications or are longer/shorter ones need in some places?

Also do you use a glue to keep it in place or does tapping it in just hold it there?
Nancy - Mom to 3 Furbabies - Bentley, Chelsea, Whiskey & 3 Roombas - 535 (Half Trax) and 560 (Shadow) and Dirt Dog (Old Yellow)
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Postby vic7767 » November 2nd, 2007, 3:43 pm

I found a place on ebay that offered a bulk one time purchase of 2000 1/4 inch stainless steel allen head 4-40 machine screws. I try to use as many of them as possible. But, sometimes I'm forced to use 3/8 or 1/2 inch screws.

The brass inserts that are threaded are just a little to large for the 9/64 inch tapping hole that I drill for each replacement screw. Therefore each brass insert must be honed/filed down to fit with the tapped hole. Once the proper diameter is reached a small amount of super glue is applied to the insert and then pressed into the hole.
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Postby sgroomba » November 10th, 2007, 8:57 pm

I can see from the design of this white piece that you don't want the screw tight. Just tight enough to not fall out, although that's hard to judge. Any excess tightness will exert tension on the sides of the split hexagonal post, which will hasten a fracture. I don't understand why the post is split. The brush keys into the hex-shaped perimeter, not the slots.

IF the side brush is fully seated on the shaft, this tension should be limited. But if the brush is not fully on, breaking the post as illustrated would be far more likely. If the brush were not fully seated, the screw would also seem more loose, causing one to tighten it farther.

Good solution, though. Excellent tinkering.
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Postby fancyfreewv » November 10th, 2007, 9:02 pm

RE: Slots

Maybe heat dissipation? or more likely a place to put your flathead screwdriver to take it out if the hex edges get rounded out? That would be of course if the entire gear isn't attached together which it may be from the look of it.
Nancy - Mom to 3 Furbabies - Bentley, Chelsea, Whiskey & 3 Roombas - 535 (Half Trax) and 560 (Shadow) and Dirt Dog (Old Yellow)
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Postby bjv » November 26th, 2007, 7:35 pm

I'm neither a mechanic nor a carpenter so I need some help here understanding what you are explaining and figuring out what I need to do. The last few days whenever I ran my 560, I would find the whole side brush had come off of the unit when I came back into the room. In all cases, I was able to recover the screw right near it. I HAD removed this brush a few times to clean under it, had always screwed it back on so it was secure but not so much that I felt I was stripping anything. Now I find that when I place the screw back in I can turn and turn the screwdriver and it never gets any tighter...tight enough so it looks like it is attached and it stays on for a few minutes but any contact with a mat or a rug will dislodge the entire brush

So what do I need to do, other than call IROBOT and complain. The white "thing" (see how technical I am?") that the screw screws into appears to be split in half...I don't recall if it always was this way intentionally or if it has been damaged.

Thanks for any suggestions.
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Postby vic7767 » November 26th, 2007, 8:16 pm

If you can remove your side brush from your Roomba and ship it to me and pay return postage, I'll mod it for you at $3.00 per side brush motor shaft. That will include the brass insert and the stainless steel bolt.
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Re: 5XX Side brush stripped screw solution

Postby NoJimForHome » December 29th, 2018, 12:01 pm

Vic - you still doing the $3 side brush mod? lol I am having the same problem with my 565 side brush now. Tried adding a little nail polish to the hole last night but no joy. Going to try some PVA glue on the screw this afternoon. If that doesn't work I'll have to figure out a new solution.
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Re: 5XX Side brush stripped screw solution

Postby vic7767 » December 29th, 2018, 3:40 pm

The best solution for 2019 will be to order an 800 Roomba model side brush MODULE ($15) with a better screw design.
Last edited by vic7767 on December 30th, 2018, 1:11 am, edited 1 time in total.
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Re: 5XX Side brush stripped screw solution

Postby NoJimForHome » December 29th, 2018, 11:39 pm

So looking on eBay... lots of "Roomba 800 side brushes" look pretty much the same as what I'm used to, and no discussion of screws. They're also less than you indicate, so I fear I'm looking at the wrong thing.
Example 3-pack for $7.69.: https://www.ebay.com/itm/3X-Pack-Side-Brush-With-Screws-for-iRobot-Roomba-800-900-Series-Robotic-Vacuum/272960919381?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D20131003132420%26meid%3D39d25839e9304d58a5b03cc850a4eb85%26pid%3D100005%26rk%3D4%26rkt%3D12%26sd%3D132765953186%26itm%3D272960919381&_trksid=p2047675.c100005.m1851
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Re: 5XX Side brush stripped screw solution

Postby vic7767 » December 30th, 2018, 1:09 am

Sorry folks, what I was trying to indicate is the complete side brush module, not just the brush.
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Re: 5XX Side brush stripped screw solution

Postby NoJimForHome » December 30th, 2018, 12:37 pm

Okay! That makes more sense. Now the challenge is finding one that is confirmed to be the new design since a lot of them say "500/600/700/800/900 series" and some say "fits 800/900 series." Anyway, thanks Vic!
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Re: 5XX Side brush stripped screw solution

Postby NoJimForHome » January 9th, 2019, 8:28 pm

Well, now I feel dumb. I got a spare side brush motor assembly for $20 shipped. Installed it.

THE BRUSH STILL WON'T STAY ON!?!?

Then I note the screws that came with my replacement brushes are only about half the length of the "original" screw in the replacement motor... which means the problem is with the dumb screws, and not the motor. :o

Oh well. Now I have a spare. lol
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