Importance

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Abstract

This specification discloses an off-road type vehicle employing an improved hydrostatic drive system having a variable displacement pump having an actuating member for varying displacement in at least one direction, wheel motors representing actuatable devices operable by fluid from the pump, hydraulic reservoir, serially interconnecting supply and return lines and an improvement comprising an over control compensation that includes high pressure relief valves on the high pressure supply lines; a neutralizing means for moving the actuating member back toward its neutral position responsive to hydraulic pressure released by the relief valves, and a bleed-off means connected with the neutralizing means and adapted to bleed-off high pressure hydraulic fluid to allow restoring operation and a bleed-off return for returning the bleed-off hydraulic fluid to the reservoir. Also disclosed are preferred embodiments in which the actuating member includes a pair of pedals for forward and reverse controls with respective means preventing operation of more than one pedal at a time and pedal travel limit stop, as well as a preferred linkage for operator comfort.

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First Claim