Replace the Side Brush Motors

To replace the side brush motor on Bob Pro, you’ll need side brush motor and a Phillips head screwdriver.

Ensure you have the correct side brush motor for your repair. Bob’s left motor will not fit on his right side. Each motor is labeled L for left or R for right.

Power off Bob before starting your repair. Press in the bumper while holding down the cover button. After 5 seconds, Bob will beep, and the cover light will turn off when released.

Next, remove the dustbin. Grasp the tab on the back of Bob and slide the dustbin out. Then, flip Bob upside down so the wheels are facing up.

Remove the screw on the side brush connected to the motor you are replacing. Then, lift the brush up to detach.

Remove the 6 large screws from the underside of Bob. Keep all screws and parts removed from Bob safely aside for later reassembly.

Next, remove the 2 small screws that hold Bob’s side casing. Pull to detach each piece, using a flat head screwdriver for leverage, if necessary.

Carefully flip Bob back onto his wheels and lift the cover to expose the mainboard.

Disconnect the circuit plug attaching the cover to the mainboard.

Next, disconnect all of the mainboard’s circuit plugs.

You'll be reattaching all the plugs later, so take note of all the connections.

Grip each plug and pull to remove, without placing stress on the wiring.

When done, remove the 4 screws holding the mainboard.

Then, lift the mainboard out.

The wall track sensor connects to the left edge of the mainboard.

Remove the screw securing the sensor to Bob, then lift to remove and set aside.

Next, remove the 2 large screws securing the bumper. Lift the bumper off Bob. Keep the 2 detachable pieces safely aside for later reassembly. Then, disconnect the bumper from the mainboard.

Now you can remove the 4 smaller screws securing the internal support frame.

Feed the wiring out from the hooks on Bob’s left and right sides, and lift the support frame out.

There are 3 screws securing each side brush motor onto Bob.

Remove them from the motor you’re replacing, then lift the motor up and out.

Place your new motor in line with the screw posts inside Bob and push down until it sits flush with Bob.

Reinstall the 3 screws previously removed.

Next, reattach the internal support frame. Align it with Bob and clear the area of any wires that could be in the way.

Push down and the support frame will snap into place when aligned correctly. Make sure the docking sensor is attached to the center of the support frame.

Then, install the 4 small screws that hold it on Bob.

Ensure the detachable pieces are placed in the appropriate spots on the bumper. They’re labeled L for left and R for right. Then, line up the bumper with Bob. Reinstall the 2 large screws.

Replace the wall track sensor and install the screw securing it.

Next, align the mainboard with the 4 screw posts inside Bob. When the mainboard sits flat, install the 4 screws removed previously.

Then, reconnect all the circuit plugs to the mainboard. The order of the plugs on the left edge, from top to bottom, is as shown in the video.

Tuck the wires for the 2 lower circuit plugs under the hook inside Bob.

The order of the plugs along the top edge of the main board, from Bob’s left to right, is as shown in the video.

Take note of the colors of each wire to ensure you replace all of the circuit plugs correctly.

The order of the plugs along the right edge of the mainboard is as seen in the video.

Remember to tuck the wires for the lower 2 circuit plugs under the hook inside Bob.

The order of the plugs along the bottom ledge, from Bob’s left to right, is as seen in the video.

Take note of any empty spaces in the mainboard.

When all circuit plugs are securely connected, you’re ready to close Bob.

Reconnect the cover's circuit plug to the mainboard. Lay the cover down, so it’s slightly below the bumper’s top edge. The bumper should move when pressed in.

Flip Bob upside down and install all 6 large screws on Bob's underside.

Align the side casing pieces with the screw holes on Bob’s underside. Then, flip Bob onto his wheels and snap the pieces onto Bob’s sides. Next, install the 2 small screws removed previously.

Remember to replace the side brushes and install the screws holding them onto Bob.

Then, flip Bob onto his wheels and slide the dustbin back in place to complete your repair.

Press and hold the cover button for 3 seconds to turn Bob back on, and congratulations! You’ve just replaced Bob Pro’s side brush motor.