Abstract: A pedal assembly is pivotably connected to a rod through a shaft of a linkage assembly. The rod has an intermediate portion and the pedal assembly is pivotable between a first and a second position so that an external pressure source may be applied thereto for operation of a boom arm of a construction machine. The pedal assembly has a foot plate with an upper and lower portion and is connected at a distal end portion of the rod through a pair of mounting ears. The lower portion of the pedal assembly contacts the distal end portion of the rod at the first position. The upper portion of the pedal assembly contacts the intermediate portion of the rod at the second position. The angular position of the pedal assembly may be selected by an operator through a block connected at the end of the rod opposite the distal end portion. An adjustment plate may be positioned precisely on the intermediate portion of the rod so that the selected angular position of the block may be maintained throughout operation.