This invention relates to a steering arrangement particularly adapted for use in construction vehicles, such as articulated tractors, whereby an operator selectively steers the vehicle by selectively conditioning steering valves upon rotation of a steering handle. The advent of adjustable steering column assemblies to accommodate various sizes of operators has dictated the need for means to prevent actuation of the steering valves upon such adjustment. In particular, it is desirable to maintain the steering valves in a neutral condition of operation upon pivotal adjustment of the steering column assembly to its various positions.