Maytronics Dolphin Ex 45 CB active brush diagonal assembly - 9995540-ASSY

Maytronics Dolphin Ex 45 CB active brush diagonal assembly

This is the complete genuine Maytronics active brush diagonal assembly (M-DIAG) for the Dolphin Ex 45 CB robotic pool cleaner. Supplied as a ready-to-fit unit, it integrates the brush roller, axle tube, bearings and PVC bristles into a single drop-in replacement. It sits at the front-underside of the robot and is the primary scrubbing component responsible for agitating dirt, algae and debris from pool surfaces.

Function and cleaning performance

The diagonal brush design applies firm, angled contact across pool floors, walls and the waterline, loosening fouling that the suction system then captures. The active designation means the roller is gear-driven directly from the robot’s drive train, so it spins under power rather than relying purely on passive contact — delivering consistent scrubbing pressure regardless of surface texture or inclination.

Modèles compatibles

This assembly is the correct brush unit for the Maytronics Dolphin Ex 45 CB. The M-DIAG variant (part root 9995540) is specific to the diagonal-brush platform used on this robot; it is not interchangeable with the M-DYN (dynamic) assembly used on other Dolphin ranges such as the M400 or EX60. Always verify your model designation before ordering.

Symptoms that indicate replacement is needed

Replace this assembly when you observe: reduced scrubbing action leaving algae or biofilm on surfaces; audible grinding or rattling from the brush bay caused by worn or disintegrated ball bearings; visible cracking, splitting or severe bristle wear on the PVC brush; or the robot losing traction and failing to climb walls reliably. Because the bearings and brush element are integrated into one unit, individual sub-components are not available separately — the complete assembly must be replaced.

Why genuine Maytronics parts matter

Genuine Maytronics parts are manufactured to exact OEM tolerances, ensuring the gear interface, shaft diameter and brush pitch match the Ex 45 CB drive train precisely. Third-party alternatives may appear identical but frequently use inferior bearing grades and softer PVC compounds that wear prematurely, risking damage to the brush bay housing. Using genuine parts also preserves any remaining manufacturer warranty on the robot.