Abstract: The operation control circuit of the present invention reduces the speed of an actuator, such as a rotation motor, according to reduction in the rotational speed of an engine. When the engine rotational speed is at its maximum, a pilot pressure in a pilot conduit is set to a relief pressure of a relief valve. When the engine rotational speed is reduced, the flow rate of pilot pressure hydraulic fluid decreases, and the pressure difference over a throttle section becomes smaller than the relief pressure, so that the pilot pressure is set to the pressure difference. Even if the operator operates an operation lever to a full stroke position the spool valve does not go to the fully opened state, since the pressure is low. As a result, the flow rate of hydraulic fluid supplied to the rotation motor is reduced, so that the speed of rotation is reduced.

Abstract: A Skid Steer Loader frame comprising a base element having a front edge, a rear edge and two lateral edges, two lateral elements substantially specular relative to each other, and each fastened to one of the lateral edges of the base element, and a front element integrally fastened to the base element and to each of the lateral elements. The lateral elements, the front element and the base element define a housing compartment. The lateral elements have a base portion and a coupling portion integrally fastened over the base portion, posteriorly relative to the base element. The base portion of each lateral element has an upper section that can be associated in abutment to a cab of a Skid Steer Loader, and defining a depression to allow lateral access to the housing compartment. The frame further comprises removable stiffening means.

Abstract: A Skid Steer Loader frame comprising a base element having a front edge, a rear edge and two lateral edges, two lateral elements substantially specular relative to each other, and each fastened to one of the lateral edges of the base element, and a front element integrally fastened to the base element and to each of the lateral elements. The lateral elements, the front element and the base element define a housing compartment. The lateral elements have a base portion and a coupling portion integrally fastened over the base portion, posteriorly relative to the base element. The base portion of each lateral element has an upper section that can be associated in abutment to a cab of a Skid Steer Loader, and defining a depression to allow lateral access to the housing compartment. The frame further comprises removable stiffening means.

Abstract: A work vehicle is provided that permits easy routine daily inspection services of a rear mounted engine in the vehicle. The vehicle has a cab covering a rear engine compartment. The cab is pivotally mounted on the frame of the vehicle. An engine hood is in turn pivotally mounted on the cab and covers the engine in the engine compartment. Accordingly, the hood can be pivoted or rotated to expose the engine for routine daily maintenance while the cab and the engine hood can be pivoted or rotated to expose the entire engine compartment for periodic heavy duty maintenance.