LG Washing Machine Pump Design

The washing machine's drainage system is responsible for emptying the tank. When the control module gives a signal, the pump starts and pumps the waste liquid, directing it to the sewer. If the pump fails, the process is disrupted, and water remains in the washing machine.

In order to react to stagnation in the drainage system in time and eliminate the breakdown, it is necessary to know the structure of the drain pump of the LG washing machine. Understanding what parts the part consists of, you can disassemble it and clean it yourself, and if necessary, replace it. Let's consider the design of a standard pump.

Let's take the pump apart screw by screw

Knowing how the drain pump on direct drive machines works, you can clean it yourself if it gets clogged. Even if it breaks down and needs to be replaced, understanding the design will make it easier to find the right components. When choosing a new pump, you need to consider three important nuances: the power of the part, the mounting method, and the contact diagram.

The pumps that are installed in modern LG direct drive machines differ from each other:

• Rated power (from 25 to 40 W),
• Method of fastening to the snail (bolt or plastic latches),
• Contact diagram (separate or double terminals),
• Type (circulation or simple).

Pumping stations also differ in the type of filtration. Usually, pumps are equipped with spiral filters. Their main drawback is that when clogged, the liquid stagnates inside the part and begins to smell bad. In this situation, you have to disassemble the body, pull out the nozzle and clean the element from the accumulated dirt.

The principle of operation of the pump is quite simple. It functions like an asynchronous engine - it has moving and static elements. The pump starts after receiving the corresponding signal from the electronic board. The algorithm of action is as follows:

• The control module gives the start command,
• The rotor (a cylinder-shaped magnet) begins to rotate,
• The impeller of the pump is set in motion (it is fixed on the shaft),
• The impeller blades set the desired direction of movement of the pumped water.

As for the magnet core and the pair of windings, they remain static. These elements help the system function.

This is how a simple drain pump installed on LG washing machines starts up. Due to their simple design, such parts rarely break. Usually, malfunctions occur due to a blockage inside the housing or a chipped impeller. Less often, the magnetic core weakens.

Circulation pumps can only pass liquid in one direction, pushing it "to the exit". Such elements are installed on more modern LG washing machines. On expensive models, the pump is additionally equipped with a rubber seal. The cuff covers the nipple and eliminates the possibility of water getting to the drum bearings.

Modern circulation "pumping stations" have a rotor shaft that passes through a central rubber bushing. The structure is additionally treated with moisture-resistant grease. The sealant fills all possible gaps, thereby ensuring smooth and quiet rotation of the mechanism. This know-how extends the service life of the part.

Let's describe the operation of the pump

The drain pump operates every time the washing machine is started, regardless of the selected mode. If the pump does not turn on, the machine will remain standing with a full tank of soapy waste water. The part is not activated immediately, but closer to the end of the cycle, before rinsing and during spinning.

To understand the principle of operation of the pump, you need to remember how the "washing" process occurs. First, the user loads the laundry into the drum, pours the powder into the tray and selects the appropriate washing program. After starting the device, the control module is activated. Then the following actions are performed:

• The inlet magnetic valve opens,
• Water is poured into the detergent drawer, mixing with the powder,
• Soapy liquid flows into the tank,
• The pressure switch controls the water level in the centrifuge,
• When enough water is collected, the machine starts washing.

The "pumping station" is included in the process not at the very beginning, but closer to the end of the program, before rinsing, then during the spin cycle. The pump, having received a signal from the main electronic module, begins to pump out water from the tank completely or partially.

Removing soapy waste from the washing machine tank occurs as follows:

• the pump is activated, the impeller is set in motion,
• water leaves the tank through the drain pipe,
• the waste liquid flows further and passes through the filter element,
• water ends up in the drain pump and flows through it,
• soapy water is removed into the sewer through the drainage hose,
• The pressure switch monitors the water level in the tank,
• When the tank becomes empty, the level sensor notifies the control module.

If the machine does not drain waste water from the tank, you will have to check the elements of the drainage system. If the pump is clogged, cleaning it will help. When the pump burns out, it is not practical to repair it; you will have to buy and install a new part.