| 摘要 |
A supplemental steering system is provided for a machine having first and second brakes actuable for slowing rotation of first and second drive outputs or wheels, a brake actuator, and a main or primary steering system. The brake actuator is connected with a first port and a second port of a supplemental steering control valve having a first chamber and a second chamber. The first port communicates with the first chamber and the second port communicates with the second chamber. The supplemental steering control valve further includes a piston located in the bore connected to a steering input and having a neutral position generally equidistant between the first and second chambers. First and second brake ports respectively communicate the first and second chambers with the first brake. The piston is movable in a first direction a predetermined distance into the first chamber to close the first port such that further movement of the piston in the first direction will urge brake fluid in the first chamber through the first brake port to actuate the first brake, and movement of the piston in a second direction actuates the second brake.
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