Maytronics Dolphin Supreme M4/M5 outer casing assembly - 99952032-ASSY

Maytronics Dolphin Supreme M4/M5 outer casing assembly

This is the complete outer casing assembly for the Dolphin Supreme M4, M5, M400, and M500 robotic pool cleaners. It forms the structural shell of the robot, enclosing and protecting the motor unit, impeller cylinder, filter cartridge bay, and internal wiring from pool water and mechanical stress. Without an intact outer casing, the robot’s internal components are exposed and the machine cannot operate safely.

What this outer casing assembly does in the Dolphin

The outer casing sits over and around the robot’s core, providing the primary housing that holds all subassemblies in their correct positions. It interfaces directly with the cartridge door, the float and housing unit, the side panels, and the track safety covers. A damaged or cracked casing compromises the watertight integrity of the robot and can allow ingress that causes motor or electrical failure.

Which Dolphin models it fits

This assembly is the confirmed OEM outer casing for the Dolphin Supreme M4, Supreme M5, M400, and M500 models. The part number 99952032-ASSY appears in the official parts diagrams for all four of these cleaners, meaning a single casing design spans both the M4/M5 generation and the M400/M500 successor range. Do not fit this casing to any other Dolphin range — the chassis geometry is model-specific.

Signs it needs replacing

Inspect the casing if you see visible cracks, fractures, or stress-whitening in the shell, particularly around the cartridge door aperture and the track mounting points. Persistent unexplained water ingress into the motor bay, despite seals and gaskets being intact, often points to a hairline crack in the casing itself. Physical impact damage from pool walls or steps is the most common cause of failure on this part.

How to install it

Remove the cartridge door, float and housing unit, side panels, and track safety covers before separating the old casing from the chassis. Transfer all sub-components to the new casing, re-seat each assembly clip firmly, and reattach the cartridge door last. The full swap takes roughly 20–30 minutes with a Phillips screwdriver and does not require specialist tools. Confirm all clips are fully seated before returning the robot to water.