Abstract: An attaching structure for securing a detachable hydraulically operated attachment to a vehicle. There is a source of hydraulic pressure on the vehicle. Hydraulic fluid from the source is circulated through valves and conduits to and from hydraulic devices which are carried by and operate the attachment. The valve which controls the hydraulic fluid to the attachment is mounted on the attachment, and remains with the attachment when the attachment is detached from the vehicle.

Abstract: A mechanism for mounting a backhoe on a vehicle including a backhoe mounting subframe having a downwardly extending work position and a transport position in which it is pivoted upwardly and outwardly from the work position. The backhoe mounting subframe is pivotally mounted about an axis transverse to the frame of the vehicle. The backhoe mounting subframe is movable at the operator's option between the work position and the transport position, and means are provided for positively latching the backhoe mounting subframe to the vehicle frame either at the work position or at the transport position.

Abstract: A limited slip differential of the speed sensitive torque biasing type in which a plate type clutch between the case and a side gear is applied jointly by the force of a spring and by the thrust force on the side gear, when the differential is at the stall or low speed condition. As the differential begins to operate and its speed increases the clutch is gradually released by pressurized fluid which is responsive to the speed of rotation, and which releases the clutch by providing a hydrodynamic film on the friction surfaces of the clutch.

Abstract: A pin retention mechanism for a pivot joint which connects together two structural members of a machine for pivotal movement relative to each other. The pivot pin has a dynamic connection with one of the structural members and there is an annular spacer on the pivot pin adjacent the dynamic connection. The other structural member has a tapered opening through it with the taper either on the structural member itself or on a bushing within an opening in the other structural member. A collet in the tapered opening has an external surface mating with the tapered internal surface. A cylindrical sleeve is located between the collet and the pivot pin and in contact with the spacer.

Abstract: A composite hydraulic system for a work vehicle which has two separate hydraulic circuits. Included in the composite system are three pumps, two of which supply the two circuits on the vehicle. A third pump transfers hydraulic fluid between the two hydraulic circuits. An engine operates all three pumps simultaneously and means are provided whereby the third pump under certain conditions operates as a motor to provide regeneration.

Abstract: A single lever shift mechanism for shifting two control valves by selective movements of a single lever. The lever includes a spindle projecting horizontally from a vertically disposed control column and is pivoted about the axis of the control column to operate one valve. The lever also includes a handle on the spindle which is turned about the axis of the handle to provide for the operation of a second control valve.

Abstract: 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.

Abstract: A self-storing panel mechanism for a vehicle engine compartment which has a lower side frame member extending longitudinally of the vehicle adjacent one side of the compartment, and an upper structural portion extending longitudinally above the lower side frame member and forming with the lower side frame member an access opening into the engine compartment. A movable side panel is detachably secured to the upper structural portion and extends downwardly across the access opening. There is at least one vertically disposed guide cable extending from the lower side frame member to a connection with the upper structural portion frame member. The guide cable normally holds the side panel in position to close the access opening but the side panel can easily be moved to the open position by disengaging the panel from the upper structural portion and allowing it to move by gravity downwardly without disconnecting the guide cable.

Abstract: A joint for connecting together two frame members of a machine for relative movement wherein one of the frame members has flexible portions which during assembly of the joint are flexed to enable the joint to be assembled without shims and without exceeding predetermined maximum stresses on the parts of the joint.

Abstract: A drive mechanism located within a vehicle wheel at the outer end of a drive axle. The mechanism is operated by the operator of the vehicle by remote control from his normal operating position. The mechanism may be connected for the usual gear reduction drive or, at the option of the operator, moved to a second position.

Abstract: A stabilizer attachment for a work vehicle. The attachment is linear in operation and when it is attached adjacent one end of a vehicle and is then extended it raises the adjacent wheel off the ground. Another stabilizer attachment on the other side of the vehicle when operated raises the corresponding wheel on the other side off the ground. With the two wheels off the ground more down pressure is exerted on a ground engaging implement and the stabilizers act as a brake securing the work vehicle in position during operation of the implement.

Abstract: A supplemental parking brake for a vehicle having a power shift transmission which includes a hydraulically operated forward clutch which is selectively engaged to put the transmission in the forward operating mode and a hydraulically operated reverse clutch which is selectively engaged to put the transmission in the reverse operating mode. The supplemental parking brake is applied automatically when the regular parking brake is applied if a predetermined condition prevails. Such condition prevails if the power transmission of the vehicle has been shifted by appropriate controls to either the forward operating mode or the reverse operating mode.

Abstract: A system for controlling two wheels at one end of a skid steer vehicle. The wheels are mounted at the distal ends of a pair of downwardly extending pivot arms; the pivot arms are mounted on the vehicle body about a common transverse axis. Two hydraulic cylinders can be operated simultaneously in either direction to raise or lower the ends of both the pivot arms thereby lowering or raising one end of the vehicle. The two hydraulic cylinders under another operating condition for the vehicle are interconnected through a hydraulic loop circuit which permits the wheel on one side of the vehicle to move upwardly and the wheel on the other side move downwardly the same amount to automatically change the attitude of the vehicle to a more nearly level position.

Abstract: A control system for a drive apparatus which includes an engine and a hydrodynamic transmission with the latter including a forward hydraulic torque converter, a reverse hydraulic torque converter, and means for selectively filling either of the torque converters with hydraulic fluid to provide operation of the drive apparatus in the desired direction. A pedal or other operator control member is provided which when operated first causes the engine speed to drop to an idling speed, while further movement of the operator control member causes the engine speed to increase and the previously inactive torque converter to fill at a rate corresponding to the movement of the pedal.

Abstract: A tilt mechanism for a bulldozer blade which includes pivotally mounted trunnion members projecting outwardly on both sides of the main frame of the vehicle. A tilt beam is pivotally connected at its extremities between the two trunnion members, and a hydraulic cylinder is pivotally connected between the main frame and one of the trunnion members for selectively tilting the bulldozer blade in unison with movement of the tilt beam and the trunnion members.

Abstract: A hydrostatic drive vehicle and a subassembly for such vehicle wherein the subassembly includes an engine and a pump mechanism arranged in a manner such that when the subassembly is assembled into the vehicle the axes of the engine and the pump mechanism are transverse of the longitudinal axis of the vehicle. Other parts such as an alternator, coolant pump, air cooling fan and fan shroud also may be included in the subassembly.

Abstract: A hydraulic system including a closed reservoir which is pressurized at a varying pressure that is responsive to a variable condition of the system. The system minimizes the air contained in the hydraulic fluid, causing air which has been released from the hydraulic fluid to collect in the reservoir which has provision for releasing it to the atmosphere.

Abstract: A detent mechanism for a hydraulic control valve, having a detent position in which a detent member is in engagement with a groove and a spring urges the detent member into the groove so that a predetermined force is required to move the detent member out of the groove. A second spring loaded detent member is provided which requires the application of another predetermined force in order to move the mechanism into the detent position. The springs for both of the detent members can be readily changed to adjust the forces required to operate them.

Abstract: A pivot joint mechanism for connecting together two relatively movable members which includes a pair of cone-type locks at the respective ends of a pivot pin which can be readily assembled and tightened to hold all of the internal parts locked in place by means of a single nut on a bolt extending through the pin, and which can be readily disassembled by inserting jack screws in the ends of the mechanism and backing the female locking members out again.