How do I replace the brushes on my Dolphin robot?

Disconnect the power supply from the electrical outlet before starting. Find the front, middle, or rear brush section below, then follow the video and instructions for your model.

For help choosing a replacement brush, contact Poolbots' pool experts by live chat or phone.

Front brush

S50 (E10, E20/E25, Active 10, Cayman, Escape, Encore)

Replacement front brush: 9995544-ASSY.

1. Disconnect the power supply from the electrical outlet.
2. Turn the robot over so its underside faces up.
3. Take the tracks off the robot.
4. Use a flathead screwdriver to remove the wheel disk.
5. Turn the wheel until you can see the drive gear's retaining screw through it.
6. Loosen and remove the screw, then take out the white drive gear.
7. Ease the old brush out gently.
8. Slide the replacement brush into position. Put the drive gear back and secure it with its screw.
9. Put the wheel cover and tracks back on.
10. Turn the brush by hand to check that it moves smoothly.

S100 (Advantage, Proteus DX3, Saturn, Echo, Nautilus CC, Active 15, Cayman, Escape, Explorer E20)

1. Disconnect the power supply from the electrical outlet.
2. Turn the robot over so its underside faces up.
3. Take the tracks off the robot.
4. Use a flathead screwdriver to remove the wheel disk.
5. Turn the wheel until you can see the drive gear's retaining screw through it.
6. Loosen and remove the screw, then take out the white drive gear.
7. Ease the old brush out gently.
8. Slide the replacement brush into position. Put the drive gear back and secure it with its screw.
9. Put the wheel cover and tracks back on.
10. Turn the brush by hand to check that it moves smoothly.

S200 (E30, Advantage Ultra, Active 20, Quantum, T35, Triton PS)

1. Disconnect the power supply from the electrical outlet.
2. Take the tracks off the robot.
3. Use a Phillips screwdriver to remove the four screws securing the brush.
4. Lift out the old brush.
5. Fit the replacement brush and secure it with the four screws.
6. Turn the brush by hand to check for smooth movement.

S300 & S400

S300 (E35/E35i, Proteus DX5i, Active 30, T35/T45, Premium 40, Explorer E30, E40i, Active 30i, T55i)

S400 (E50i, Active 50, Explorer E50)

1. Disconnect the power supply from the electrical outlet.
2. Take the tracks off the robot.
3. Use a Phillips screwdriver to remove the four screws securing the brush.
4. Lift out the old brush.
5. Fit the replacement brush and secure it with the four screws.
6. Turn the brush by hand to check for smooth movement.

M400/M500 (Sigma, Oasis, Nautilus CC Supreme, Aquarius XL, C4)

1. Gently push the brush out with a flathead screwdriver until it releases.
2. Position the replacement brush where the old one sat.
3. Press the brush inward until it is seated.
4. Turn the wheels to check that the brush moves properly.

M250 (Nautilus CC Plus, Dx3, Zenit 20)

Follow the video for the front-brush replacement procedure.

Premier

Follow the video for the front-brush replacement procedure.

Middle brush

M400/M500

1. Disconnect the power supply from the electrical outlet.
2. Turn the robot over so its underside faces up.
3. Remove the four screws securing the brush, one at each corner.
4. Lift the brush out of the robot.
5. Fit the replacement brush in the same position as the old one.
6. Reinstall all four screws and tighten them.

Sigma

Replacement middle brush: 9995541-R1.

This middle-brush procedure applies to Sigma produced in 2026 or later.

1. Disconnect the power supply from the electrical outlet.
2. Turn the robot over so its underside faces up.
3. Remove the four screws securing the brush, one at each corner.
4. Lift the brush out of the robot.
5. Fit the replacement brush in the same position as the old one.
6. Reinstall all four screws and tighten them.

Rear brush

S200 (E30, Advantage Ultra, Active 20, Quantum, T35, Triton PS)

Replacement rear brush: 99955380-ASSY.

1. Disconnect the power supply from the electrical outlet.
2. Turn the robot over so its underside faces up.
3. Take the tracks off the robot.
4. Carefully free the brush from the notches on both sides, then remove it.
5. Fit the replacement brush where the old one sat.
6. Put the tracks back on both sides.
7. Turn the brush by hand to check for smooth movement.

S300 & S400

S300 (E35/E35i, Proteus DX5i, Active 30, T35/T45, Premium 40, Explorer E30, E40i, Active 30i, T55i)

S400 (E50i, Active 50, Explorer E50)

Replacement rear brush: 99955380-ASSY.

1. Disconnect the power supply from the electrical outlet.
2. Turn the robot over so its underside faces up.
3. Take the tracks off the robot.
4. Carefully free the brush from the notches on both sides, then remove it.
5. Fit the replacement brush where the old one sat.
6. Put the tracks back on both sides.
7. Turn the brush by hand to check for smooth movement.

M400/M500 (Sigma, Oasis, Nautilus CC Supreme, Aquarius XL, C4)

Replacement brush assembly: 99955340-ASSY.

1. Gently push the brush out with a flathead screwdriver until it releases.
2. Position the replacement brush where the old one sat.
3. Press the brush inward until it is seated.
4. Turn the wheels to check that the brush moves properly.

M600/M700 (Active 60, E60i, Explorer E70)

Replacement rear brush: 99955340-ASSY.

1. Disconnect the power supply from the electrical outlet.
2. Turn the robot over so its underside faces up.
3. Take the tracks off the robot.
4. Carefully free the brush from the notches on both sides, then remove it.
5. Fit the replacement brush where the old one sat.
6. Put the tracks back on both sides.
7. Turn the brush by hand to check for smooth movement.

M250 (Nautilus CC Plus, Dx3)

Follow the video for the rear-brush replacement procedure.

M550

Follow the video for the rear-brush replacement procedure.