DOLPHIN EX SERIES SPARE PARTS

The compatibility of Dolphin EX Series spare parts is verified using the serial number and the Maytronics technical parts diagram for the unit. This series shares a drive platform across several components, but there are variations depending on the year of manufacture and the robot’s specific features.

Before purchasing any parts, check these three key points:

• Serial number visible on the silver label on the lower chassis.
• Installed filtration type, distinguishing between a rigid basket and a frame with ultra-fine filtration panels.
• Floating cable configuration, with or without an anti-tangle swivel device.

Checking these technical details prevents traction misalignment and electrical connection problems in the motor unit.

A pool cleaner’s loss of vertical grip is usually due to wear on both the toothed tracks and the cleaning brushes. If the motor maintains normal suction power but the unit slips on the tile or liner, the belts’ elastomer has lost its elastic tension and friction grip.

To fix this track traction issue, replace the following mechanical wear parts:

• Pair of toothed side tracks, checking for cracks or looseness on the gears.
• Front and rear active brushes, checking that the bristles or blades have a profile of more than 5 millimeters.
• Drive roller and bearings, ensuring they spin freely without limescale or sand buildup.

Replacing these components restores precise movement, allowing the robot to climb walls without overloading the drive unit.

The main difference lies in the porosity of the filter fabric and the type of debris retained at each stage of the season. Spring panels have a coarse-filter mesh calibrated between 100 and 150 microns, ideal for collecting large leaves, twigs, and floating debris when opening the pool in spring without restricting the suction flow.

In contrast, the ultrafine filtration panel uses a 50-micron pleated membrane capable of capturing suspended dust, pollen, and fine soil particles that cloud the water. Using the coarse-filter basket at the start of the season and then switching to the ultrafine kit extends the cartridges’ service life and reduces manual wash cycles.

A sudden cycle interruption indicates a thermal protection response or a power supply fault affecting the pool cleaner. To isolate the problem before buying Dolphin Serie EX replacement parts, check the power supply’s indicator light and perform a basic continuity test.

If the power supply LED turns off or flashes abnormally as soon as the cable is connected, the fault is usually in the transformer’s power stage. If the power supply delivers a constant voltage of 29 to 30 volts DC but the cleaner stops the propeller, the fault lies in the motor assembly or in moisture entering through a leak in the motor’s perimeter seals. Replacing the damaged unit immediately restores cleaning-cycle operation.

Preventive replacement of the drive belts and rollers should be scheduled every two or three seasons under normal residential use. However, wear accelerates if the water has high residual chlorine levels or if the pool has rough surfaces such as fiberglass or sand-textured paint.

Check these physical indicators to plan the replacement:

• Lateral tension on the track, with visible slack of more than 10 millimeters from the chassis.
• Worn internal teeth that slip over the pulleys when pulling.
• Conical deformation of the drive rollers caused by continuous friction.

Installing new tracks in time prevents excessive mechanical strain on the internal transmission gears.

Adding a floating cable with a swivel is entirely feasible if your unit's chassis and electronics support the two-pin or three-wire connection required for that model. The swivel is a sealed rotating mechanism that turns independently on its own axis, dissipating the torsional strain generated as the robot makes 90- and 180-degree turns on the pool floor.

For trouble-free installation, check the type of connector that links directly to the power supply. Replacing a damaged rigid cable with a swivel version prevents permanent loops, ensures the unit covers 100% of the pool surface, and prevents internal breaks in the copper conductor.

The motor block in the EX Series range can be replaced independently by following the manufacturer's exploded view and using common workshop tools. Maytronics' modular design places the propulsion and suction assembly inside a sealed housing that is accessible by removing the outer casing and the upper flow deflector grille.

To carry out the installation correctly, always disconnect the power supply from the mains before opening the chassis. Make sure the perimeter O-rings fit perfectly into their grooves to preserve the watertight seal of the submersible compartment. A clean replacement ensures the pool cleaner continues to operate for several more seasons.