Abstract: An electric hydraulic control device for controlling hydraulic cylinders of work tools in a construction vehicle, in which control valves of the hydraulic cylinders are controlled in two ways. For some work tools which need not be controlled smoothly and finely, the corresponding control valves are controlled directly by an electric signal outputted according to the position of the operation levers, and for other work tools which must be controlled smoothly and finely, the corresponding control valves are controlled through an electric servo mechanism which is operated by an electric signal representative of the amount by which the operation lever is manipulated. In addition, there is provided a detector for detecting as to whether the transmission lever is in the locked condition, and electric systems of all of the control valves are rendered inoperative when the transmission lever is in the locked condition.

Abstract: A radiator guard structure for a vehicle comprising a pair of lift cylinder supports secured to a frame of the vehicle, a pair of hooks secured to the frame, and a radiator cover detachably mounted to the frame for guarding a radiator.The radiator cover has formed or mounted thereto a pair of pins each being engageable with the respective hooks and a pair of mounting seat structures. A resilient mounting is provided between each of said mounting seat structures and each of said lift cylinder supports.

Abstract: A final drive assembly for a vehicle comprising a housing, an input pinion gear rotatably supported by the housing, a sun gear shaft rotatably supported by the housing, a final drive bull gear fixedly secured to the sun gear shaft and in mesh with the input pinion gear, a planetary reduction gear group with a carrier thereof being rotatably mounted on the sun gear shaft, a sprocket rotatably mounted on the housing, and a torque tube fixedly secured to the sprocket and mounted for rotation on the sun gear shaft, the torque tube being coupled with the carrier.

Abstract: An automatic decelerator device for use in crawler-type vehicles such as a bulldozer or the like comprising a vehicle speed change lever means having a plurality of speed stages for forward and backward drives, a plurality of solenoid operated valves provided in a transmission for controlling the same to change over the vehicle speed and/or the drive direction, controller means adapted to actuate brake means and a decelerator, a comparator for comparing an actual vehicle speed with a preset vehicle speed so as to detect whether the actual vehicle speed is higher or lower than the preset one thereby generating a signal corresponding to the detection result, and a solenoid operated valve control circuit for controlling the controller means and the solenoid operated valves in response to the signal.

Abstract: A suspension apparatus for a track-type vehicle comprises a main frame having a pair of laterally spaced track frames pivotally mounted on either side thereof through a pair of pivot shafts fixedly connected to either side thereof. The forward portions of the track frames are connected to opposite ends of an equalizer bar extending transversely therebetween through a pair of stress-relieved mounting devices into which lateral and vertical displacements of the track frames and the equalizer bar are absorbed so as to prevent "toe-in" of the track frames.

Abstract: A hydraulic control system for variable displacement pumps, comprising at least two variable displacement pumps, a prime mover for driving the variable displacement pumps, a fixed displacement pilot pump driven by the common prime mover, a pressure compensating valve comprising a two-stage proportional pressure reducing valve and a negative proportional pressure reducing valve, the pressure compensating valve being connected to the variable displacement pumps and the fixed displacement pilot pump, and at least two servo boosters each being mechanically connected to the respective variable displacement pumps for controlling the displacement therefrom, the servo boosters being connected to the fixed displacement pilot pump and the pressure compensating valve and controlled thereby.

Abstract: A hydraulic control system for a variable displacement pump, comprising a prime mover for driving the variable displacement pump, a fixed displacement pilot pump driven by the common prime mover, a pressure compensating valve connected to the pilot pump and the variable displacement pump, a cut-off control valve connected to the pressure compensating valve and the variable displacement pump, and a servo booster connected to the cut-off control valve and the pilot pump for controlling the displacement of the variable displacement pump.

Abstract: A displacement control system for a variable displacement pump comprising a charge pump; a cut-off control valve connected to the charge pump, the cut-off control valve including a valve body having a first and a second pump ports and an outlet port formed therein, the first pump port being connected to the charge pump and the second pump port being connected to the variable displacement pump, a sleeve mounted within the valve body, a pin slidably mounted within the sleeve, a spool slidably mounted within the sleeve, a cylindrical cap member fixedly secured to the valve body defining a spring chamber therein, and a spring disposed within the spring chamber for urging the spool toward connecting the first pump port with the outlet port; and a servo booster connected to the outlet port for controlling the displacement of the variable displacement pump.

Abstract: A displacement control system for a variable displacement pump comprising a charge pump; a first and a second actuators connected in parallel to the variable displacement pump; a cut-off control valve connected to the charge pump, the cut-off control valve including a valve body having a first and a second pump ports, a pressure port and an outlet port formed therein, the first pump port being connected to the charge pump, the second pump port being connected to the variable displacement pump and the pressure port being connected to the first actuator, a sleeve mounted within the valve body, a first and a second pins slidably mounted within the sleeve, a spool slidably mounted within the sleeve, a cylindrical cap member fixedly secured to the valve body defining a spring chamber therein, and a spring disposed within the spring chamber for urging the spool toward connecting the first pump port with the outlet port; and a servo booster connected to the outlet port for controlling the displacement of the variabl