RUNNING TRANSMISSION GEAR FOR WORKING VEHICLE

PURPOSE:To prevent unprepared backward high speed operation surely by providing the change point of speed change operating resistance at the shifting place from a first cam face in the backward low speed position to a second can face in the backward high speed position for energizing a trunnion to be reset into a speed change neutral position. CONSTITUTION:The cam plate 5a of a cam mechanism 5 for energizing a trunnion 4 to be reset into a speed change neutral position N is fixed at the trunnion 4, and the bracket 6a of a speed change pedal 6 and the cam plate 5a are connected by a rod 7. The cam plate 5a is provided with a forward cam face C, and a first cam face (a) for backward low speed and a second cam face (b) for backward high speed formed inversely interposing the speed change neutral position in between. The second can face (b) acting in the backward high speed position is formed at a steeper angle than the first cam face (a), provided with the change point of speed change operating resistance formed at its shifting place, and energizes the trunnion 4 to be reset into the speed change neutral position N with larger reset energizing force. An operator thereby feels change in stepping force during the operation, thus preventing unprepared backward high speed operation.