Patent ID: 6715590
Filing Date: 2004-04-06
Classification: B60T

Abstract:
A work vehicle comprising;a frame; ground engaging means for supporting and propelling the frame; a source of pressurized hydraulic fluid; spring applied hydraulically released brakes for braking the ground engaging means; a brake system hydraulic line extends from the source of pressurized fluid to the spring applied hydraulically released brakes for directing pressurized hydraulic fluid from the source of pressurized hydraulic fluid to the spring applied hydraulically released brakes; a manual control element operated by an operator for applying the spring applied hydraulically released brakes; a secondary hydraulic system for performing a secondary operation independent of the spring applied hydraulically released brakes, the secondary hydraulic system having a manually operated hydraulic pump that provides pressurized hydraulic fluid to a hydraulic cylinder for a secondary vehicle operation through a secondary system hydraulic line; wherein the secondary system hydraulic line is provided with a first hydraulic quick coupler and a second hydraulic quick coupler which are coupled together when the secondary system is being operated, the brake system hydraulic line is provided with a third hydraulic quick coupler that is coupled to the first hydraulic quick coupler when the work vehicle is being towed so that the manually operated hydraulic pump supplies pressurized hydraulic fluid to release the spring applied hydraulically released brakes.