An oil sump is mounted on an assembly formed by a crankcase and a flywheel housing of an internal combustion engine. The flywheel housing has a first parting plane to the crankcase and to the oil sump. In mounted state, the joint faces of the flywheel housing, the crankcase, and the oil sump lie on each other. The crankcase has a second parting plane to the oil sump. In mounted state the joint faces of the crankcase and the oil sump lie on each other. At least one guide is provided between the flywheel housing and the oil sump, the guide orienting at least the joint faces of the oil sump and the crankcase relative to each other during connection of the oil sump to the assembly formed by the crankcase and flywheel housing, such that on creation of the abutment connection between the oil sump and the crankcase, these joint faces are oriented substantially planar parallel.

A fan drive for a working vehicle includes a speed shift unit and a fan in series to the speed shift unit. The speed shift unit includes a clutch unit and is configured to discretely provide a first non-zero speed ratio and a second non-zero speed ratio. The clutch unit is configured to alternatively connect the first or the second non-zero speed ratio to the fan.

A fan assembly may include an input shaft, first and second belts, first and second pulleys engaged by the first belt, third and fourth pulleys engaged by the second belt, output shaft rotationally coupled to a fan, and a clutch assembly. The second pulley may be rotationally coupled to the first pulley via the first belt so as to rotate in the same direction as the first pulley. The fourth pulley may be rotationally coupled to the third pulley via the second belt so as to rotate in the opposite direction of the third pulley. The clutch assembly may be configured to selectively rotationally couple the output shaft to the input shaft via the first pulley, first belt, and second pulley. The clutch assembly may also be configured to selectively rotationally couple the output shaft to the input shaft via the third pulley, second belt, and fourth pulley.

A working machine may include a prime mover including an output shaft, a working part coupled to the output shaft, a slip mechanism, and a fan attached to the output shaft via the slip mechanism. The slip mechanism may be configured to: in a case where a load torque applied on the output shaft when driving the fan is less than a predetermined value, rotate the output shaft and the fan integrally with each other, and in a case where the load torque when driving the fan is greater than or equal to the predetermined value, rotate the output shaft and the fan relative to each other.

A driven accessory that includes an input member, a cover, an output member, a clutch and a clutch actuator. The input member is rotatable about and axis and has a hub, an outer rim, and a radially extending web that couples the hub to the outer rim. The cover is coupled to the input member for common rotation about the axis and cooperates with the input member to define a clutch cavity. The clutch is received in the clutch cavity and selectively transmits rotary power between the input member and the output member. The clutch actuator is selectively operable to change the operational state in which the clutch operates. The clutch actuator has an electromagnetic coil that is disposed outside the clutch cavity. The hub is disposed along the axis between the clutch and the electromagnetic coil