Abstract: A lift structure for a work vehicle including a pair of lift arms arranged on opposite sides of the work vehicle, each lift arm having a first end pivotally coupled to the work vehicle and a second end for coupling to a tool. Each lift arm includes a first side plate member, a second side plate member, an elongated top tubular member and a bottom member. Each side plate member has a plurality of pivot orifices including at least one pivot orifice near each end of the side plate members and at least one intermediate pivot orifice located between each end of the side plate members. The elongated top tubular member is attached between each of the parallel side plate members at the top edge so as to connect to each side plate member. A bottom member is positioned in a spaced relationship from the top member between each side member and is connected to each side member. The top tubular member provides additional strength to the side plate members to resist bending and torque loads.

Abstract: A lift structure for a work vehicle including a pair of lift arms arranged on opposite sides of the work vehicle, each lift arm having a first end pivotally coupled to the work vehicle and a second end for coupling to a tool. Each lift arm includes a first side plate member, a second side plate member, an elongated top tubular member and a bottom member. Each side plate member has a plurality of pivot orifices including at least one pivot orifice near each end of the side plate members and at least one intermediate pivot orifice located between each end of the side plate members. The elongated top tubular member is attached between each of the parallel side plate members at the top edge so as to connect to each side plate member. A bottom member is positioned in a spaced relationship from the top member between each side member and is connected to each side member. The top tubular member provides additional strength to the side plate members to resist bending and torque loads.

Abstract: An earth-moving machine includes a coupling releasably joining a bucket to an end of a dipper stick. The coupling includes a hook pivotably coupled to the dipper stick about a first axis and configured to engage a pin secured to the bucket. The coupling further includes a pair of pins coaxially disposed along the axis and movable between an extended position in which the pins are received within a pair of spaced openings on the bucket to join the bucket to the dipper stick and a retracted position in which the pins are removed from the openings. The pins are actuated between the extended position and the retracted position by an actuator disposed along the axis between the pins. The actuator preferably includes a cylinder, first and second pistons disposed within the cylinder and coupled to the first and second pins, respectively, and at least one source of hydraulic pressure fluidly coupled to the cylinder to pressurize the cylinder and to move the first and second pistons and the first and second pins.