For this repair, you will need a Phillips head screwdriver.
Make sure Bob’s side power switch is turned OFF and flip him over onto a flat surface. Remove the screw securing Bob’s main brush in place.
Remove Bob’s main brush to remove the screw located beneath it (depending on Bob's model, there may be 2 screws).
Remove the 5 screws lining Bob’s underside.
Flip Bob back onto his wheels and lift his cover up. To remove Bob’s cover completely, you must detach 3 circuit plugs from his main board. Pinch the small white tab on the side of each circuit plug and pull upwards to remove it.
Slide Bob’s power inlet out and place his cover aside.
The screw securing the front wheel in place is located just above Bob’s main board. Remove the screw while gripping onto the front wheel.
There are 5 washers holding the front wheel in place: 1 is on the side of the screw that you removed,
and 4 sit on top of the wheel itself.
Remove the 3 screws holding the front wheel together.
Pop the wheel open so you can thoroughly clean its interior.
When done cleaning, hold the wheel together and replace all 3 screws.
Next, replace the 3 washers in the following order:
Place the large black washer onto the wheel with the number 2 side facing up.
The gold washer should be sandwiched between the two silver washers: the first silver washer should have its flat side against the wheel,
and the second silver washer should have have its flat side facing outward.
Place the wheel back in its place underneath Bob.
Lastly, replace the screw and washer securing the wheel above the main board.
Now you’re ready to put Bob’s cover back together. First, reattach all the circuit plugs you removed to separate Bob's cover. Press down on each circuit plug to ensure it securely locks in place.
Before closing Bob's cover, slide his power inlet back in its place.
Carefully realign the edges of Bob’s cover and flip him onto his back. Replace the 5 screws on his underside to seal his cover together.
Replace the 1 or 2 screws located beneath Bob's main brush.
Place the main brush back in its compartment. Attach the end piece first
and align the square end with the square-shaped notch inside Bob.
Lastly, replace the screw securing Bob's main brush in place and your repair is complete!