Clark Equipment Compnay

Thomas Q Haeder

William C Shelbourn

Larry E Albright

Wally L Kaczmarski

Thomas M Sagaser

Orlan J Loraas

Scott B Jacobson

Joseph M Mather

Knute K Brock

Gerald M Berg

Lyle L Johnson

A control apparatus controls movement of a lift arm and tool on a skid steer loader. Power actuators are coupled to the lift arm circuit and the tool circuit for moving the lift arm and tool along a path. A sensor is coupled to the skid steer loader for sensing a desired parameter and providing a signal indicative of the desired parameter. A power interrupter is coupled between the power actuators for the lift arm and tool and the sensor and interrupts power to the actuators based on the signal. A manually operable bypass mechanism is coupled to the power interrupter and the power actuators and is used to bypass the power interrupter to allow movement of the lift arm.

Hydraulic interblock system

An electrically controlled auxiliary hydraulic system for both front and rear mounted attachments on a skid steer loader. An electrically actuated auxiliary control valve is coupled to the front and rear mounted attachments through an electrically actuated diverter valve. An operator can select between control of either the front or rear attachments by actuating a diverter switch located on a steering lever. The auxiliary control valve is then used to control the selected attachment by actuating forward, reverse and forward latch switches on the control handles. The selected attachment can also be operated in a high pressure mode by actuating a high pressure switch when extra horsepower needs to be delivered to the attachment.

Electrically controlled auxiliary hydraulic system for a skid steer

An auxiliary coupler pressure relief hydraulic system for off-road vehicles including a battery, an engine, an engine ignition system, a reservoir of hydraulic fluid, and a pump for providing hydraulic fluid under pressure. Quick couplers couple hydraulic fluid to an attachment mounted to the vehicle. An electro-hydraulic spool valve is connected to a source of pilot pressure and controls the flow of hydraulic fluid to the quick couplers in response to valve actuating signals. Forward and reverse auxiliary control switches are coupled to the spool valve and provide valve actuating signals resulting in fluid flow to the quick couplers in forward and reverse directions. Also included is an ignition switch having RUN, OFF and RELIEF positions. When switched from its RUN position to its RELIEF position, the ignition switch provides pressure relief valve actuating signals which stroke the spool valve and bleed pressure trapped between the valve and the quick couplers while the engine RPM is decreasing and pilot pressure is still available.

Auxiliary coupler pressure relief hydraulic system with pump drive

The hydraulic system of this invention is for operating a tree processing implement on a work vehicle so that during a first part of an operating cycle the implement is supplied by two hydraulic pumps jointly, while during another part of the operating cycle the implement is supplied by only one of the pumps. The result is that during the first part of the cycle the implement moves rapidly but during the other part it moves slowly.

Power limiting hydraulic system

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Lisbon, ND, United States of America

Thomas Q Haeder