Abstract: A hydraulic control circuit for controlling the operation of an attachment or tool associated with a particular work machine wherein such circuit includes an actuator for controlling the operation of the attachment or tool, a control valve operable to control fluid flow to the actuator, a fluid path communicating the control valve with the actuator, and a pilot signal control device positioned in communication with both the control valve and a pilot pressure source and having a signal port in communication with the actuator for sensing the pressure associated therewith, the control device being responsive to the pressure associated with the actuator and being operable for sending a control signal to the control valve when a pressure condition in the actuator reaches a predetermined value, the control signal actuating the control valve so as to at least partially close such valve and maintain an operative pressure on the attachment actuator while, at the same time, decreasing the fluid flow through the control

Abstract: A heat exchanger assembly includes a frame and a heat exchanger which is movable relative to the frame. The assembly further includes a handle pivotally secured to the frame. Moreover, the assembly includes a linkage pivotally secured to the handle. The linkage is also pivotally secured to the heat exchanger. Movement of the handle from a first handle position to a second handle position causes the heat exchanger to move from a first heat exchanger position to a second heat exchanger position.

Abstract: An apparatus for controlling a first fluid cylinder and a second fluid cylinder includes an operational pressure source and a fluid control circuit. The fluid control circuit includes a pilot valve assembly having a first valve position and a second valve position. Moreover, the fluid control circuit (1) delivers pressure from the operational pressure source to the first fluid cylinder when the pilot valve assembly is positioned in the first valve position, (2) isolates the second fluid cylinder from the operational pressure source when the pilot valve assembly is positioned in the first valve position, (3) delivers pressure from the operational pressure source to the second fluid cylinder when the pilot valve assembly is positioned in the second valve position, and (4) isolates the first fluid cylinder from the operational pressure source when the pilot valve assembly is positioned in the second valve position. A method for controlling a first fluid cylinder and a second fluid cylinder is also disclosed.

Abstract: A hydraulic deceleration control for a hydraulic motor includes a pilot operated control valve for controlling fluid flow through a pair of motor lines connected to the opposite sides of the hydraulic motor. A valve device is disposed to communicate a source of pressurized fluid to a fluid energy storage device when the control valve is in its open position and to release the pressurized fluid contained in the storage device when the control valve is moved from the open position to its closed position. A throttle orifice releases the fluid from the storage device at a controlled flow rate. A pilot operated diverter valve is disposed in series with an orifice disposed between the motor lines to control fluid flow through the orifice and has a spring disposed at a first end resiliently biasing the diverter valve to its closed position.

Abstract: A control logic for a multiple use hydraulic system includes a selector switch having a first position connecting a battery to a treadle switch operable to energize a solenoid pilot valve for communicating pilot fluid to an end of a first directional control valve. The selector switch has another position connecting the battery to a bi-directional push button switch operable to selectively energize a pair of solenoids of a second pilot valve. Energizing one of the solenoids moves the second pilot valve in one direction to communicate pilot fluid to an end of the first and a second control valve. Energizing the other solenoid moves the second pilot valve in the opposite direction to communicate pilot fluid to the other end of the control valves. The selector switch has a third position connecting the battery to a pair of pressure switches connected to a pair of lines connecting a manually actuated pilot valve to a pair of solenoid blocker valves.