Abstract: A work vehicle cooling system comprises a cooling fan (18) driven by the output from an engine (16), and a flow path for allowing an airflow (27) generated by the cooling fan (18) to be flown between the engine (16) and an operator's seat (14) without having passed through any of a radiator (20) and an oil cooler (21) for the engine (16). With this simple configuration, the heat generated by the engine (16) is prevented from being transmitted to the operator's seat (14).

Abstract: The invention provides a crawler frame provided with a machine body frame which is integrally formed by molding means wherein a machine body frame constituted of a pair of front leg supports and rear leg supports and a center frame is integrally formed by molding means as a continuous curved shape on a basis of a smooth curved surface so as to evenly receive loads by an entire machine body frame without generating any concentrated load, even if a load and a working load from an upper revolving body applied to the center frame, and a working load applied to a track frame at a time of traveling, revolving and working of a working machine are applied to the machine body frame.

Abstract: A vertical lift type arm device includes a set of left and right control links each having three connection shaft holes, a set of left and right central mounting parts which are provided at a center part of the main frame, and a set of left and right mounting parts which are provided at rear parts of the lift arms and extend downward. Front end parts of the control links and the central mounting parts are pivotably attached to each other, center parts of the control links and lower end parts of the mounting parts are pivotably attached to each other, and connection axes of the control links and the central mounting parts are provided at a same height as or at a higher position than connection axes of lower end parts of the rear links and the main frame.

Abstract: A work vehicle cooling system comprises a cooling fan (18) driven by the output from an engine (16), and a flow path for allowing an airflow (27) generated by the cooling fan (18) to be flown between the engine (16) and an operator's seat (14) without having passed through any of a radiator (20) and an oil cooler (21) for the engine (16). With this simple configuration, the heat generated by the engine (16) is prevented from being transmitted to the operator's seat (14).

Abstract: A vertical lift type arm device includes a set of left and right control links each having three connection shaft holes, a set of left and right central mounting parts which are provided at a center part of the main frame, and a set of left and right mounting parts which are provided at rear parts of the lift arms and extend downward. Front end parts of the control links and the central mounting parts are pivotably attached to each other, center parts of the control links and lower end parts of the mounting parts are pivotably attached to each other, and connection axes of the control links and the central mounting parts are provided at a same height as or at a higher position than connection axes of lower end parts of the rear links and the main frame.

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.