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Barrette's Small Engines Inc. - SmallEngines.ca FAQ's

How do you adjust the ground speed of a tractor with a hydrostatic transmission?
NOTE:  These instructions are prepared for use by trained technicians who are experienced in the service and repair of equipment of the kind described in this publication, and are not intended for use by untrained or inexperienced individuals. Such individuals should seek the assistance of an authorized service center.

Hydrostatic transmissions feature control rod linkage from the speed control lever (or foot pedal on some models) to the hydrostatic transmission. This control rod connects to the hydrostatic transmission at a regulator valve, which determines the rate of fluid flow through the transmission and results in output speed to the wheels. By adjusting the control rod, the entire assembly may be adjusted to regulate the amount of travel necessary at the operator's control. This regulated travel limits range of the tranmission valve. Please refer to the tractor Operators Manual and associated Illustrated Parts diagrams for more information on the location and identification of these linkages on a particular model/style of tractor.

If the control valve is adjusted to maximum position (either forward or reverse) and the ground speed seems impeded, then the transmission may need internal service. Low fluid levels, fluid contamination, clogged filters and internal bypass valves all may need to be inspected and corrected to return the fluid drive transmission to peak operating performance.






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