The Upper Spray Arm Pivot Shaft is an OEM part for LG dishwashers. This part allows the upper spray arm to rotate and distribute water evenly throughout the upper rack during the washing cycle. Causes of a bad part can include wear and tear over time, damage from foreign objects, or improper installation or alignment. Symptoms of a bad Upper Spray Arm Pivot Shaft include: The upper spray arm not rotating or spinning Poor water coverage and cleaning performance in the upper rack Loud grinding or squeaking noises coming from the upper rack area This OEM LG part is also compatible with some Kenmore models.Part Number 4370ED3006A (AP4997094) replaces 1267504, AH3522915, EA3522915, PS3522915.