SPRING APPLIED STEERING BRAKES CONTROLLED BY TRANSMISSION CLUTCH PRESSURE

摘要

A control system for crawler tractor spring applied brakes having hydraulic actuators for releasing the brakes. Pressure fluid from the steering clutch control is directed to the actuators to release the brakes for normal crawler tractor operation and a brake pressure regulating valve is biased by the fluid pressure in the power shift transmission control whereby a pressure drop in the latter during direction changes and neutral condition causes the brake regulating valve to drop the brake pressure thereby allowing the brake springs to automatically apply the brakes.