Williams Controls Pedal, Typ WM476-F5A1
WM476F series treadles are surface mounted, pedal actuated throttle controls for on-highway applications. Each WM476F model incorporates a regulating valve subassembly from the WM90DX series. When the WM476F's pedal is applied, the valve subassembly delivers an output proportional to the pedal position. The output controls a throttle cylinder which positions an engine's fuel pump lever.