The Idler Arm Pulley is an OEM part for Frigidaire dryers. This part keeps the belt aligned and tight, preventing slippage and contributing to consistent drum rotation.  Causes of a bad Idler Arm Pulley can range from normal wear and tear, which can degrade the pulley's material or bearings, to improper alignment that puts undue stress on the pulley, leading to premature failure. Symptoms of a malfunctioning Idler Arm Pulley include: Unusual noises, such as squeaking or rumbling, indicating the pulley may be worn or loose The dryer drum failing to rotate, even though the motor is running Excessive wear or damage to the dryer belt This OEM Frigidaire part is also compatible with Electrolux, Gibson, Kelvinator and some Kenmore models.Part Number 131863007 (AP3886900) replaces 1191132, 131434600, 131580400, 131826900, 131863000, 131863004, AH1156706, EA1156706, PS1156706.