A crawler assembly including a crawler frame member having a first crawler extension and a second crawler extension and an idler wheel disposed therebetween. The idler wheel defines a bore therethrough. The crawler assembly includes a shaft that extends through the bore. The shaft is fixed relative to the wheel by a tapered interference fit and rotatable relative to the first and second crawler extensions. A first side of the shaft is received by the first extension and has at least one journal bushing disposed therebetween. A second side of the shaft is received by the second extension and has a least one journal bushing disposed. A removable endcap is secured to each of the first and second sides of the shaft. A thrust surface is created at an interface between the endcaps and the journal bushings.
