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The pool pump makes a strange hissing sound? The problem probably comes from faulty ball bearings. It only takes 2 hours and a few euros to replace them, provided you have a pull-hubs.

Pool pump to repair

A pump is an essential equipment for the operation of a swimming pool.
It sucks the water at the bottom through the bung and on the surface by the skimmers, returns it in a filter through separate conduits each equipped with valves, then expels upward, free of impurities, by the discharge nozzles. All these elements create a continuous movement of water, which keeps it clean.

A pool pump: how it works

The filtration pump consists of two parts: a pump body with a turbine that allows the suction and discharge of water and, at the front, a prefilter (basket) that recovers "waste" that can damage the blades of the turbine.
The motor (electric or thermal) is, meanwhile, screwed on the pump body.
Thus coupled, the motor shaft can rotate the pump impeller. The engine is cooled by a propeller located at the rear of the block.

Warning signs of the breakdown

In our example, the engine with a power of 0.55 kW allows a flow of 8000 liters / hours. The ball bearings consist of a two-crown structure between which steel balls inserted in grooves roll. They serve to prevent wear of the rotating shaft and its support, and thereby the heating of the engine.
The first signs revealing a failure of the ball bearings are the presence of runouts (rust color), at the level of the engine block, associated with a persistent hissing. With time, the engine vibrates.
Conclusion: it no longer drives the mechanism and the bearing or bearings no longer play their role. Another possible situation: the pump operates, but the balls come out of their housing and deteriorate the rotor or the winding in the case of an electric motor.

Savings in spare parts

In both cases, it is necessary to change the damaged parts.
They can be ordered in specialized stores or on the Internet (,
The repair took place here in 2 hours and at little cost (6 € the turnover).
Indispensable to intervene on the bearings, the pull-hubs can be bought for less than 30 €. A low investment, compared to the price of a pool pump that ranges from 100 to 600 €...

Steps to repair the engine of your pool yourself

Steps to repair the engine of your pool yourself

After locating the wiring diagram, disconnect the motor pump body with an Allen wrench. Then disconnect the wires from the terminal block.

Steps to repair a step-by-step pool pump: steps

Using a pipe wrench (13), loosen the motor shaft nut and use a flat screwdriver to unlock the cooling screw.

Steps to repair a step-by-step pool pump: pool

Before disassembling the motor body, locate the position of all moving parts, using a marker. They will have to be put in place exactly, with the same setting.

Steps to repair a step-by-step pool pump: step-by-step

Open the cover on the back of the motor body to access the rotor on which the ball bearings are mounted. To access the faulty bearing, remove the rotor.

Steps to repair a step-by-step pool pump: repair

The bearing remains attached to the housing because of rust. Heat the aluminum hood to expand the metal of the bearing. Protect your hands with leather gloves.

Steps to repair a step-by-step pool pump: step-by-step

Extract the bearings with a puller. Even if only one of the bearings is defective, it is safer to change the two to avoid another intervention.

Steps to repair a step-by-step pool pump: repair

Using a magnifying glass, read the reference of the bearings. If unreadable, use a vernier caliper to measure the width and diameter of the inner and outer rings.

Steps to repair a step-by-step pool pump: step-by-step

Replace the bearings with a tube corresponding to the inside diameter of the bearing bushing. Tap with a mallet until you reach the stop.


• It is not uncommon for disassembly, strongly oxidized nuts and screws to deteriorate or, in the extreme case, break. Considering their cost, place them without hesitation or if you do not have the necessary tools, reproduce threadings and threads.
• To avoid mistakes when reassembling, do not hesitate to photograph some details: electrical connections, order and position of parts...

Video Instruction: How to: Replace a Pool Pump Motor