How to Mod the Green CHM

The very latest news and updates for the iRobot Roomba robotic vacuum, the Scooba Robotic Washer and the Dirt Dog workshop sweeper. All discussion and troubleshooting questions go here.

How to Mod the Green CHM

Postby vic7767 » May 27th, 2009, 8:36 pm

The Sealed ball bearings used were 1) 6 x 10 x 3 mm bearing for the brush motor from VXB.com, 2) 10 x 15 x 4 mm bearing for the small rubber brush. 3) 15 x 21 x 4 mm bearing for the large brush. The 15 mm inside diameter ball bearing does not allow much clearance between the square portion of the brush gear and the wall of the ball bearing. If one is concerned you may substitute a larger ID sealed bearing like the 17 x 26 x 5 mm instead but you will have to cut away some of the plastic from the wire brush retainer.

This mod does not cover the actual removal of the CHM from the Roomba. The owners manual and online video at the iRobot site should help the owner with the actual removal of the CHM.

I'll mention here that I can also perform this mod on your CHM no matter which one you have.
Attachments
GreenCHM_1.gif
Last edited by vic7767 on March 23rd, 2010, 10:55 am, edited 4 times in total.
Roomba and Neato Mods, come visit: http://www.vic7767.com/
User avatar
vic7767
Robot Master
 
Posts: 14895
Joined: January 14th, 2006, 8:31 pm
Location: Haughton Louisiana - USA

Re: How to Mod the Green CHM

Postby vic7767 » May 27th, 2009, 8:46 pm

Just as a side note: If the Red DOT is not in place then after the mod is complete please use a piece of tape and place it over the deck height adjustment wire to help prevent early failure of the CHM due to a broken wire.
Attachments
GreenCHM2.gif
Roomba and Neato Mods, come visit: http://www.vic7767.com/
User avatar
vic7767
Robot Master
 
Posts: 14895
Joined: January 14th, 2006, 8:31 pm
Location: Haughton Louisiana - USA

Re: How to Mod the Green CHM

Postby vic7767 » May 27th, 2009, 8:55 pm

Remove the end-plate of the blue assembly so that the complete Green brush deck can be removed from the case housing.
Attachments
GreenCHM_3.gif
Roomba and Neato Mods, come visit: http://www.vic7767.com/
User avatar
vic7767
Robot Master
 
Posts: 14895
Joined: January 14th, 2006, 8:31 pm
Location: Haughton Louisiana - USA

Re: How to Mod the Green CHM

Postby vic7767 » May 27th, 2009, 9:07 pm

With the blue end-piece removed, spread the plastic case apart enough to allow the deck height adjustment cable to be removed from the slit it normally sits in. You can also pull the paddle board connector out of its holding place since the screws were previously removed. Then you can pull the rest of the brush deck out of the blue plastic cage.
Attachments
GreenCHM_4.gif
Roomba and Neato Mods, come visit: http://www.vic7767.com/
User avatar
vic7767
Robot Master
 
Posts: 14895
Joined: January 14th, 2006, 8:31 pm
Location: Haughton Louisiana - USA

Re: How to Mod the Green CHM

Postby vic7767 » May 27th, 2009, 9:26 pm

When the two screws are removed from the brush motor and the motor is pulled back away from the gear assembly the screws can be returned to the holes they came from.
Attachments
GreenCHM_5.gif
Roomba and Neato Mods, come visit: http://www.vic7767.com/
User avatar
vic7767
Robot Master
 
Posts: 14895
Joined: January 14th, 2006, 8:31 pm
Location: Haughton Louisiana - USA

Re: How to Mod the Green CHM

Postby vic7767 » May 27th, 2009, 9:30 pm

Once the motor is removed it can be turned around and kept in place out of the way using some clear tape.
Attachments
GreenCHM_6.JPG
Roomba and Neato Mods, come visit: http://www.vic7767.com/
User avatar
vic7767
Robot Master
 
Posts: 14895
Joined: January 14th, 2006, 8:31 pm
Location: Haughton Louisiana - USA

Re: How to Mod the Green CHM

Postby vic7767 » May 27th, 2009, 9:38 pm

The brush deck can now be turned up so that the six screws holding the gear access plate can be removed.
Attachments
GreenCHM_7.gif
Roomba and Neato Mods, come visit: http://www.vic7767.com/
User avatar
vic7767
Robot Master
 
Posts: 14895
Joined: January 14th, 2006, 8:31 pm
Location: Haughton Louisiana - USA

Re: How to Mod the Green CHM

Postby vic7767 » May 27th, 2009, 9:42 pm

With the plate removed you will be able to access the six gears and the surrounding area to wipe out the lubricant applied during assembly.
Attachments
GreenCHM_8.JPG
Roomba and Neato Mods, come visit: http://www.vic7767.com/
User avatar
vic7767
Robot Master
 
Posts: 14895
Joined: January 14th, 2006, 8:31 pm
Location: Haughton Louisiana - USA

Re: How to Mod the Green CHM

Postby vic7767 » May 27th, 2009, 9:48 pm

Once the six gears are removed they can be cleaned of the lubricant by using liquid soap and a toothbrush.
Attachments
GreenCHM_9.JPG
Roomba and Neato Mods, come visit: http://www.vic7767.com/
User avatar
vic7767
Robot Master
 
Posts: 14895
Joined: January 14th, 2006, 8:31 pm
Location: Haughton Louisiana - USA

Re: How to Mod the Green CHM

Postby vic7767 » May 27th, 2009, 10:05 pm

When filing down the diameter of the brush motor gear a small screw and nut can be used to hold the gear and insert the screw into the end of the drill.
GreenCHM_11.JPG
GreenCHM_12.JPG
Roomba and Neato Mods, come visit: http://www.vic7767.com/
User avatar
vic7767
Robot Master
 
Posts: 14895
Joined: January 14th, 2006, 8:31 pm
Location: Haughton Louisiana - USA

Re: How to Mod the Green CHM

Postby vic7767 » May 27th, 2009, 10:14 pm

The two larger gears can be inserted into the drill using the metal shaft that is already installed in each. As the diameter is filed down on each gear a test fitting of the ball bearing should be done from time to time so that the bearing has a tight fit.
GreenCHM_13.JPG
GreenCHM_14.JPG
Last edited by vic7767 on May 28th, 2009, 9:16 pm, edited 1 time in total.
Roomba and Neato Mods, come visit: http://www.vic7767.com/
User avatar
vic7767
Robot Master
 
Posts: 14895
Joined: January 14th, 2006, 8:31 pm
Location: Haughton Louisiana - USA

Re: How to Mod the Green CHM

Postby vic7767 » May 27th, 2009, 10:39 pm

There are three basic tools that can be used to enlarge the diameter of the holes for the gear assembly. Although two of the tools can be installed into an electric drill it is slower but safer to use them by hand.

The first tool is a "step drill", the second is a shank mounted grinding stone, and the third is a fine round file.
GreenCHM_15.JPG
GreenCHM_16.JPG
Roomba and Neato Mods, come visit: http://www.vic7767.com/
User avatar
vic7767
Robot Master
 
Posts: 14895
Joined: January 14th, 2006, 8:31 pm
Location: Haughton Louisiana - USA

Re: How to Mod the Green CHM

Postby vic7767 » May 27th, 2009, 10:46 pm

As each hole is enlarged just enough for a tight fit of the gear with the bearing installed on it, a test fit of the gear next to it can also be done. This helps verify that the gear alignment will be true when all three bearing gears are installed. After all gears are in place the gear cover plate can be trial fitted to make sure the gears are in alignment.
Attachments
GreenCHM_17.JPG
Roomba and Neato Mods, come visit: http://www.vic7767.com/
User avatar
vic7767
Robot Master
 
Posts: 14895
Joined: January 14th, 2006, 8:31 pm
Location: Haughton Louisiana - USA

Re: How to Mod the Green CHM

Postby vic7767 » May 27th, 2009, 10:55 pm

When installing the brush motor check that the motor is in proper alignment with the Green deck and that the deck height adjustment wire is stretched out so the end of it can be reinserted into the slit in the blue cage.
Attachments
GreenCHM_18.gif
Roomba and Neato Mods, come visit: http://www.vic7767.com/
User avatar
vic7767
Robot Master
 
Posts: 14895
Joined: January 14th, 2006, 8:31 pm
Location: Haughton Louisiana - USA

Re: How to Mod the Green CHM

Postby vic7767 » May 27th, 2009, 11:03 pm

After white lithium grease is applied to the gear teeth surfaces and the metal shafts, install the gear assembly access cover with the six screws. This part will be difficult for most but you might be able to at least test and verify the brush motor and gears will operate without much resistance. Try using a 9 volt battery connected to the red and black leads of the paddle board and verify that the gear assembly will spin. If you can test the amount of current being consumed by the brush motor make sure it is below .5 amps at 16 volts.
Attachments
GreenCHM_19.JPG
Roomba and Neato Mods, come visit: http://www.vic7767.com/
User avatar
vic7767
Robot Master
 
Posts: 14895
Joined: January 14th, 2006, 8:31 pm
Location: Haughton Louisiana - USA

Re: How to Mod the Green CHM

Postby vic7767 » May 27th, 2009, 11:13 pm

Finally install the Green brush assembly back into the blue CHM cage. Make sure the paddle board is in place and the screws tightened so they are flat with the blue plastic case. Make sure the brush deck height adjustment wire is in place and the Red DOT in place or a piece of tape over the plastic slot.
GreenCHM_20.JPG
GreenCHM_21.gif
Roomba and Neato Mods, come visit: http://www.vic7767.com/
User avatar
vic7767
Robot Master
 
Posts: 14895
Joined: January 14th, 2006, 8:31 pm
Location: Haughton Louisiana - USA

Re: How to Mod the Green CHM

Postby vic7767 » May 27th, 2009, 11:15 pm

All comments are welcome and if additional info is needed, post it.
Roomba and Neato Mods, come visit: http://www.vic7767.com/
User avatar
vic7767
Robot Master
 
Posts: 14895
Joined: January 14th, 2006, 8:31 pm
Location: Haughton Louisiana - USA

Re: How to Mod the Green CHM

Postby Fraggboy » May 27th, 2009, 11:20 pm

Excellent work Vic!! :clap:


A small note to members needing this service performed, Vic7767 can perform this for you for a fee.
Chris

:confusion-shrug:
Website Question? Check out the FAQ section.
Roomba/Scooba Question? Check out the READ FIRST section.
:text-search:
Before posting, check out the improved Search engine. Your question might have been answered already.
User avatar
Fraggboy
Robot Master
 
Posts: 3661
Joined: March 2nd, 2007, 4:13 pm
Location: In sunny California

Re: How to Mod the Green CHM

Postby Tearstone » June 24th, 2009, 11:20 am

Very nice write up :) I just got my bearings from Vic and I'll be doing this soon :)
Russ Sanderlin
Roomba 550, Scooba 5800
User avatar
Tearstone
 
Posts: 22
Joined: April 29th, 2009, 9:22 am
Location: Orlando, FL.

Re: How to Mod the Green CHM

Postby MikeD55 » June 24th, 2009, 11:49 am

Vic, Thanks very much for posting the process and pictures! Question, is the process (or parts) different for modifying a red/blue CHM?
560 + Dirt Dog
2 Sons, 3 Dogs
MikeD55
Robot Addict
 
Posts: 124
Joined: March 28th, 2009, 3:16 pm

Next

Return to iRobot Roomba and Scooba Chat

Who is online

Users browsing this forum: vic7767, z_thompsonpa and 327 guests