Abstract: An operator restraint bar or seat bar has side arms that are pivotally mounted to a rear wall of a loader cab, and a front lap bar. The restraint bar is mounted with a spring that will absorb energy when the front lap bar is moved in a forwardly direction. A spring also provides forces for urging the seat bar assembly to a working or restraining position. After the seat bar assembly has been pivoted away from its working position a desired amount, the spring urges the seat bar assembly toward a raised position. In one form of the invention, a single spring on each side arm performs all of the functions of absorbing energy and urging the restraint bar toward its working position and after initial upward movement, toward a raised position. The energy absorption can be accomplished by spring loading the vertical and horizontal arm section in various ways, so a change in angle between them adds energy to an energy absorbing member.

Abstract: A lift arm assembly for a small or “mini” loader is pivotally mounted onto a self propelled frame for movement between a raised and a lowered position. In the raised position, a support strut is provided that fits over an extended rod of the lift arm operating cylinder and will prevent the lift arm assembly from lowering. The support strut is stored in a front tubular cross member of the lift arm assembly. Additionally, the front cross member supports an upright strut that acts as a back stop for material in a bucket, by projecting upwardly beyond the bucket top so that if an object in the bucket tends to roll rearwardly, if the bucket is not leveled, it will be intercepted by the upwardly projecting portion of the back stop and deflected laterally.

Abstract: A pivot pin assembly is formed by providing a cylindrical pin portion with a boss at one end. The boss has a flat shoulder surface, so that its periphery is non-circular. A lever arm is provided with a bore that fits over and is complimentary to the boss, and the lever arm is held in place on the boss with a removable threaded fastener that secures the lever arm and the cylindrical pin portion together.

Abstract: A small loader has a frame, and drive tracks on opposite sides of the frame. The, drive tracks are mounted over drive sprockets and idler wheels to establish lengths of track at upper sides. The frame includes upright members at a rear portion for mounting a lift arm assembly made of two lift arms joined together. Each lift arm has a rear portion pivotally mounted on the upright portion of the frame and extending downwardly and forwardly to join side portions of the lift arms that are substantially parallel to the upper lengths of the respective tracks in a lowered position of the lift arm assembly. Actuators for pivoting the lift arm assembly are mounted on the frame, below the side portions and above the tracks, and extend generally parallel to both the side portions and the upper length of the tracks when the lift arm assembly is in a lowered position.

Abstract: A pivot pin assembly is formed by providing a cylindrical pin portion with a boss at one end. The boss has a flat shoulder surface, so that its periphery is non-circular. A lever arm is provided with a bore that fits over and is complimentary to the boss, and the lever arm is held in place on the boss with a removable threaded fastener that secures the lever arm and the cylindrical pin portion together.

Abstract: A small self-propelled loader has hydraulic drive motors and at least one work cylinder, and has a hydraulic system that efficiently utilizes the available horse power from an internal combustion engine on the loader. The engine drives a tandem pump and the flows from two sections of the tandem pump pass through a first diverter valve that permits using the flow from each of the pump sections to drive a respective one of the drive motors. The return or drain flow from valves controlling the drive motors is connected to a second diverter valve to selectively direct the drain flow from the drive motors for operating remote work cylinders. Alternately, the first diverter valve directs the output from one pump section to the work cylinders, so that when the loader is standing still or moving very slowly, the work cylinder has adequate flow, and flow from the other pump section is split to power the drive motors.

Abstract: An operator restraint bar or seat bar has side arms that are pivotally mounted to a rear wall of a loader cab, and a front lap bar. The restraint bar is mounted with a spring that will absorb energy when the front lap bar is moved in a forwardly direction. A spring also provides forces for urging the seat bar assembly to a working or restraining position. After the seat bar assembly has been pivoted away from its working position a desired amount, the spring urges the seat bar assembly toward a raised position. In one form of the invention, a single spring on each side arm performs all of the functions of absorbing energy and urging the restraint bar toward its working position and after initial upward movement, toward a raised position. The energy absorption can be accomplished by spring loading the vertical and horizontal arm section in various ways, so a change in angle between them adds energy to an energy absorbing member.

Abstract: A small self-propelled loader has hydraulic drive motors and at least one work cylinder, and has a hydraulic system that efficiently utilizes the available horse power from an internal combustion engine on the loader. The engine drives a tandem pump and the flows from two sections of the tandem pump pass through a first diverter valve that permits using the flow from each of the pump sections to drive a respective one of the drive motors. The return or drain flow from valves controlling the drive motors is connected to a second diverter valve to selectively direct the drain flow from the drive motors for operating remote work cylinders. Alternately, the first diverter valve directs the output from one pump section to the work cylinders, so that when the loader is standing still or moving very slowly, the work cylinder has adequate flow, and flow from the other pump section is split to power the drive motors.

Abstract: A small loader has a frame, and drive tracks on opposite sides of the frame. The drive tracks are mounted over drive sprockets and idler wheels to establish lengths of track at upper sides. The frame includes upright members at a rear portion for mounting a lift arm assembly made of two lift arms joined together. Each lift arm has a rear portion pivotally mounted on the upright portion of the frame and extending downwardly and forwardly to join side portions of the lift arms that are substantially parallel to the upper lengths of the respective tracks in a lowered position of the lift arm assembly. Actuators for pivoting the lift arm assembly are mounted on the frame, below the side portions and above the tracks, and extend generally parallel to both the side portions and the upper length of the tracks when the lift arm assembly is in a lowered position.

Abstract: A small or mini loader is operated by a platform standing on the ground or other surface supporting the loader, and at the rear of the machine. Hydraulic control levers operate drives on opposite sides of the machine, and the control levers are pulled rearwardly from a stopped position to effect the rearward drive. A pivoting panel is mounted on the rear of the frame and has a wall portion that protrudes outwardly from the rear of the machine. When the lower end of the pivoting panel engages an obstruction or other item that provides a force tending to move the lower end of the panel forwardly relative to the frame, an actuator arm will move to cause control levers that are in a rearward drive position to be moved to the stopped position.

Abstract: A lift arm assembly for a small or “mini” loader is pivotally mounted onto a self propelled frame for movement between a raised and a lowered position. In the raised position, a support strut is provided that fits over an extended rod of the lift arm operating cylinder and will prevent the lift arm assembly from lowering. The support strut is stored in a front tubular cross member of the lift arm assembly. Additionally, the front cross member supports an upright strut that acts as a back stop for material in a bucket, by projecting upwardly beyond the bucket top so that if an object in the bucket tends to roll rearwardly, if the bucket is not leveled, it will be intercepted by the upwardly projecting portion of the back stop and deflected laterally.

Abstract: A operator restraint bar for a working vehicle, specifically for a skid steer loader, is mounted on the rear wall of the cab of the loader and is movable from a restraint position to a raised position with one end adjacent the roof of the cab. The restraint bar is mounted onto brackets that are self contained and include a spring for holding the bar in either its working position or its raised position by arranging the pivot points of the bar and the spring so that they go over center between the working and raised positions. A sensor is used at the pivot for indicating when the restraint bar has reached its working position.

Abstract: A system and method for diagnosing output power of an internal combustion engine includes means for diagnosing potential causes of low engine output power or torque and means for estimating actual engine output power or torque. In a preferred embodiment of the diagnosis of engine output power, low engine output power is first investigated for authenticity to verify whether a low engine output power condition exists. If one exists, a zero fueling engine cranking test is conducted to determine whether relative compression values for each of the cylinders are within specification, and any problems associated therewith are corrected by service personnel. If the low engine output power problem is not corrected in accordance with the engine cranking test, a snap-throttle cylinder balancing test is conducted to balance the relative power contribution from each cylinder.