Abstract: A diagnostic system and method for diagnosing problems in a hydrostatic transmission of a vehicle including a transmission control unit that has a monitor and pressure sensors and at least one temperature sensor connectable between diagnostic hose ports coupled to the transmission and inputs on the transmission control unit. A symptom or problem area is selected on the monitor; and a test sequence is initiated by command input on the monitor. The transmission control unit performs calculations based upon input data from the pressure sensors to determine a hydraulic problem, and provides directions for adjustments or replacing parts on the hydrostatic transmission. The monitor may provide instructions to relocate existing sensor connections for the test sequence selected.

Abstract: A diagnostic system and method for diagnosing problems in a hydrostatic transmission of a vehicle including a transmission control unit that has a monitor and pressure sensors and at least one temperature sensor connectable between diagnostic hose ports coupled to the transmission and inputs on the transmission control unit. A symptom or problem area is selected on the monitor; and a test sequence is initiated by command input on the monitor. The transmission control unit performs calculations based upon input data from the pressure sensors to determine a hydraulic problem, and provides directions for adjustments or replacing parts on the hydrostatic transmission. The monitor may provide instructions to relocate existing sensor connections for the test sequence selected.

Abstract: Three independent functions are controlled from a single control lever. The lever is mounted on a universal joint having a slip yoke, a flanged yoke and a cross member extending between the two yokes and defining a first transverse pivot axis and a second transverse pivot axis. The slip yoke is provided with first and second ball joints located in the same plane as the cross member. The first function is controlled by the fore-and-aft movement of the control lever pivoting the slip yoke about the first transverse pivot axis moving the first ball joint up and down. The first ball joint is coupled to a first link that moves the first hydraulic control valve. The second function is controlled by the side-to-side movement of the control lever. Such a side-to-side movement pivots the slip yoke about the second transverse pivot axis moving the second ball joint and second link positioning the second hydraulic control valve. The third function is controlled by the twisting movement of the control lever.