Raptors, the authorized dealer of Cummins (China), established in 2015 by Mr. Jordan Wang who worked in Cummins (China) for 8 years, Jordan had been responsible for mine market for 4 years during working in Cummins china, so we have big advantages for almost all genuine Cummins generators, engine assembly and spare parts, especially for NTA855, KTA19, KTA38, KTA50, QSK60, QSX15 etc...What is idler gearThe idler gear is a gear that only transmits torque between two non-contact transmission gears, and meshes with these two gears at the same time to change the rotation direction of the driven gear to make it the same as the driving gear.Its role is only to change the steering and not to change the gear ratio, it is called the idler.Difference among idler gear, tensioner and guide pulleyThe idler gear refers to a gear that is sandwiched between two gears and meshes with both gears. Its function is only to change the rotational direction relationship between the two gears before and after it, without changing the transmission ratio, and the position cannot be changed.The tensioner appears in the belt drive or chain drive. Its function is to tension the belt or chain, reduce the vibration and energy loss during their movement, and can change the position.The guide pulley, as the name suggests, mainly plays a guiding role. In the design of the gear train, in order to meet the design requirements and external size requirements, the direction of the belt is more complicated, but to ensure the idler tensioner and pulley wrap angle design, it is necessary to The guide wheel realizes the design requirements and the design angle.