Unique Bargains No.21819687 Belt Tensioner for Volvo D13 2017-2021 Drive Belt Tensioner with Pulley Assembly Replaces No.24201573/20739751

[Fitment]: Belt Tensioner Fits for Volvo D13 2017-2021, for MACK MP8 Truck Engine, Drive Belt Tensioner Replaces OE Number:21819687/24201573/20739751 [Function of Belt Tensioner]: Replace the old or broken belt tensioner to ensure that the drive belt always maintains the proper tension, supports the belt and guides it to run in a predetermined path, and reduces the vibration and noise generated by the belt during operation. [Features of Belt Tensioner w/Pulley]: Adopt with solid metal for wear resistance, not easy break or deform, ensure longer service life. providing just the right amount of fastening force and tension control for stable and efficient system operation. [Signs of A Worn Tensioner]: 1.Excessive belt slack or tightness; 2.Alternator, power steering, airconditioning, or other belt-driven accessories work intermittently or lackpower; 3.Tensioner pulley becomes worn or wobbly; 4. hydraulic fluid leakage, rust, orcorrosion on the tensioner body. These indicate that it's time to replace. [Package Include]: 1x Belt Tensioner Assembly. lf you do not have an installation manual or enough skills to install this part, it is recommended that you seek help from a qualified mechanic.