A hydraulic system for a working machine includes a first hydraulic apparatus to be activated by the operation fluid, a second hydraulic apparatus being configured to be activated by the operation fluid, a first operation valve to control the operation fluid to be supplied to the first hydraulic apparatus, a second operation valve to control the operation fluid to be supplied to the second hydraulic apparatus, a first fluid tube connecting the first operation valve to the first hydraulic apparatus, a second fluid tube connecting the first operation valve to the second hydraulic apparatus, a third fluid tube connecting the first fluid tube to the second fluid tube, and an outputting fluid tube connected to any one of the first operation valve and the second operation valve and configured to output the operation fluid supplied from any one of the first fluid tube and the second fluid tube.

A loader control system includes: a boom position calculation unit configured to calculate a position of a boom rotatably supported by a vehicle body of a loader; a bucket attitude calculation unit configured to calculate an attitude of a bucket rotatably supported by the boom; a determination unit configured to determine whether the attitude satisfies a predetermined condition on the basis of the attitude and a reference attitude of the bucket in dumping movement; and a work machine control unit configured to cause the bucket to carry out the dumping movement, and output a control signal to cause the boom to carry out lifting movement when the attitude is determined to satisfy the predetermined condition.

On a turn frame of an excavation machine, a hydraulic oil tank is placed in the center of a right engine chamber in the front-back direction, a control valve is placed in front of the hydraulic oil tank, a battery is further placed in front of the control valve, and a cool mechanism is placed behind the hydraulic oil tank. The control valve is supported by a support member, and a controller that outputs a signal for driving the control valve is mounted to a side plate part of the support member, thereby to be placed in a position in front of the control valve and above the battery.

A high voltage portion (HVP) includes an electric motor and a battery that supplies electric power to the electric motor, the high voltage portion (HVP) being a portion to be subjected to maintenance. An operator's cab is arranged on a revolving frame at a location closer to a front end of the revolving frame than the high voltage portion (HVP). A frontmost end position of the high voltage portion (HVP) is located closer to a rear end of the revolving frame than a rearmost end position of the operator's cab. A switching valve is located between the frontmost end position of the high voltage portion (HVP) and the rearmost end position of the operator's cab in a fore/aft direction.

A working machine includes a machine body, a working device on the machine body, an operation room structure on the machine body and including an operation room and a floor surface body to define a floor surface of the operation room, and a heater to heat an interior of the operation room. The heater includes a heat generator to generate heat by using electric power, and a hot water circulator to cause water heated as a result of heat generation of the heat generator to circulate. Among components of the heater, at least the heat generator is located in a space in the machine body below the floor surface body.

An exhaust pipe (7A) in an engine (7) is provided with. an exhaust gas purifying device (10) with a urea selective reduction catalyst (13A) removing nitrogen oxides in an exhaust gas. The exhaust gas purifying device (10) is provided with a urea water injection valve (14) that injects urea water as a reducing agent to the upstream side of the urea selective reduction catalyst (13A). The urea water injection valve (14) is connected to a urea water tank (22) through a urea water pump (25). The urea water pump (25) is arranged in an upper side to the urea water tank (22). A return conduit line (30) in which the urea water flows from the urea water pump (25) toward the urea water tank (22) is disposed in an upper-lower direction between the urea water pump (25) and the urea water tank (22).

An exhaust pipe (7A) in an engine (7) is provided with an exhaust gas purifying device (10) with a urea selective reduction catalyst (13A) removing nitrogen oxides in an exhaust gas. The exhaust gas purifying device (10) is provided with a urea water injection valve (14) that injects urea water as a reducing agent to the upstream side of the urea selective reduction catalyst (13A). The urea water injection valve (14) is connected to a urea water tank (22) through a urea water pump (25). The urea water pump (25) is arranged in an upper side to the urea water tank (22). A return conduit line (30) in which the urea water flows from the urea water pump (25) toward the urea water tank (22) is disposed in an upper-lower direction between the urea water pump (25) and the urea water tank (22).

A work vehicle includes a riding-type traveling vehicle body and a hydraulically operable front loader coupled to a front of the traveling vehicle body. The traveling vehicle body includes left and right rear wheels disposed to the left and right of a driver seat, left and right rear fenders covering the left and right rear wheels, a valve unit for the front loader and an operating lever for the front loader. The valve unit is disposed in a space between the rear wheel and the rear fender on one of left and right sides, and the operating lever extends from the space, upward of the rear fender on the one of the left and right sides.

A method of operating a digging machine, including operationally connecting a sensor to a bucket, operationally connecting an electronic controller to the sensor and to each respective hydraulic cylinder, operationally connecting a valve system to the hydraulic cylinder and to the electronic controller, inputting a desired post excavation landscape contour into the electronic controller, inputting locations of underground objects into the electronic controller, automatically actuating a bucket hydraulic cylinder operationally connected to the bucket, and automatically controlling the bucket hydraulic cylinder to dig within predetermined parameters.

A valve stack assembly includes a first valve assembly having at least one valve and defining a first plurality of fluid passageways. The valve stack assembly also includes a second valve assembly having at least one valve and defining a second plurality of fluid passageways. An end block defines a third plurality of fluid passageways. The end block is mechanically and fluidly coupled to the first valve assembly and the second valve assembly, such that the third plurality of fluid passageways fluidly couples the first plurality of fluid passageways and the second plurality of fluid passageways to one another. The first valve assembly is disposed along a first valve axis and the second valve assembly is disposed along a second valve axis. The first valve axis is offset from the second valve axis.