V. OPERATING INFORMATION

Power Steering

The full-time power steering system consists of a h ydraulic steering motor (mounted on the end of the steering wheel shaft) which is connected to a pair of double-action steering cylinders (fig. 5.22, item 1) mounted on a steering pivot (fig. 5.22, item 2) which oscillates a pair of tie rods (fig 5.22, item 3) going to each steering leg. This system is powered by one of the hydraulic dual gear pumps driven by the detasseler’s engine. Since these gear pumps are sensitive to engine RPM (the h igher the RPM the higher the oil flow), it is best to always operate the detasseler at full recommended RPM to ensure maximum ste ering responsiveness.

Electro-Hydraulic Valves

The electro– hydraulic valve (fig. 5.23, item 1), located on the front toolbar controls the lift cylin ders in their upward and downward movements. The dump valve (fig. 5.23, item 2), located directly under the operator’s seat, is the main valve which controls the amount of pressure going to the lift valve. The dump valve is preset at the factory to 2200 psi.