iRobot Roomba 500 Series - Manual (Page 21)

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Replaceable Modules
Roomba has a number of modules that can be replaced, including its drive
wheels, side brush, main cleaning head, vacuum bin, caster wheel and
battery.
To access Roomba’s replaceable modules, remove the bottom cover of
Roomba by removing the 4 screws on the bottom of Roomba and the side
brush.
Refer to the table below to determine the part number of each replaceable
module.
Side brush module
Part Name Part Number
Side brush module 17729
Right wheel module 17732
Left wheel module 17731
Cleaning head module 17728
Vacuum bin module 17733
Battery 80501
Front caster wheel 18103
Left wheel module
Front caster wheel
Chassis
Replaceable cover
Bottom cover
Right wheel module
Cleaning head module
Battery
Vacuum bin module