A heavy capacity front idler is required for Morooka MST800 crawler carriers at the back of the undercarriage. The heavy rubber tracks on the MST800 series require the idler to bear the weight of the track at the back of the machine and maintain tension due to the long undercarriage and heavy track weight. When the idler is brand-new, the wheel has a diameter of almost seventeen and a half inches, so you can measure the wear on your current idler to see how much of the diameter has been worn. At the point where it rests inside the rubber track’s guiding system, the wheel’s actual width is more than two inches. This idler component comes with the installation nuts. Along with these tension idlers, we also have the sprockets, bottom rollers, and top rollers in store. To extend the life of the new parts, inspect your complete undercarriage before placing an order and replace any worn or damaged parts.