This is the aftermarket replacement tension idler wheel for the following Kubota mini excavator models:
This is the larger wheel that tensions the rubber track when you grease the tensioner. It is located on the opposite end of the undercarriage from the sprocket and there is one idler per side, two total per mini excavator.
The idler is sold as a complete assembly with the mounting arms and bearing complete as pictured.
The total diameter of the idler wheel is right at 10 inches, and the yoke or mounting arm is 6 1/4 inches long and 2 5/8 inches wide.
This idler assembly (69191-21300) is known to fit:
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