Learn how your appliance is supposed to operate so you can determine if it is malfunctioning.
I replace more failed couplers on direct drive washers than any other part. When it fails it will prevent the washer from agitating and spinning but it will still drain as the pump is connected directly onto the motor. If the water is draining, the motor is functioning properly.
The motor to transmission coupler provides for vibration isolation along with some protection to the motor in the event the transmission locks up. If you lay the washer down on the front of the cabinet the coupler can be seen from the bottom as follows although doing so could cause the internal suspension to move out of place.
I have never seen a transmission lock up but I have seen the holes get enlarged in the rubber isolator and the studs break off the motor and transmission couplers. This is usually caused by the abrupt motor reversal between the agitate and pump out functions. If you hear a loud bang every time the motor reverses, the coupler is getting loose. An obvious sign of a failed coupler is a pile of black rubber shavings under the washer. If the motor runs and the agitate and spin functions don't work, the studs may have broken off the coupler (old coupler design) or the coupler may have broken at the shaft (new design) and you need a new coupler kit. The coupler can also just crack around its center hole allowing it to slip on the motor or transmission shaft hampering those functions.
The following picture shows the three components of the old coupler: transmission coupler, rubber isolator and the motor coupler. Note that the transmission coupler slides onto the transmission shaft. The rubber isolator is sandwiched between the couplers. The motor coupler slides onto the motor shaft.
The following picture shows the three older style coupler components laid out to show the shaft and rubber isolator holes. Note that the rubber isolator has six holes to accommodate the couplers - each with three studs.
The following picture shows the new improved coupler. On first look, the plastic studs have a larger cross section which should help prevent the studs from cutting through the rubber isolator. Also note that there is not as much plastic material surrounding the shaft hole.
The new coupler occasionally cracks or wears at the shaft hole, allowing the coupler to slip around on the shaft and make a loud noise like a playing card slapping in bicycle spokes. The picture below shows a new style coupler that critically failed in this manner. The latest coupler design has metal inserts where connected to the shafts.
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