Patent ID: 6360538
Filing Date: 2002-03-26
Classification: E02F

Abstract:
A method for controllably moving a machinery platform of a work machine having an electro-hydraulic system, and the machinery platform being movable by a swing motor located on the work machine, including the steps of:determining if the speed of the swing motor is changing; controlling a solenoid actuated valve in response to determining if the swing motor speed is changing, wherein the solenoid actuated valve is configured to responsively produce a relief valve pilot signal; inputting the relief valve pilot signal to a two-way relief valve and controllably shifting the two-way relief valve in response to the relief valve pilot signal; and engaging one of a high pressure by-pass valve and a low pressure by-pass valve, wherein one of the high pressure by-pass valve and the low pressure by-pass valve is selected by the shifting of the two-way relief valve.