To enable maintenance of a control valve in a narrow space, on a slewing frame an engine is disposed at a rear portion, a swivel joint is disposed between a pair of vertical plates, a slewing motor is disposed diagonally behind the swivel joint between the paired vertical plates, and a control valve is disposed diagonally behind the swivel joint between the paired vertical plates and forward of the engine. A detachment direction A of a plurality of spools of the control valve extends obliquely in such a way as to get closer to a right vertical plate as it goes rearward.

A working machine according to one aspect of the present invention, includes a support member, a turn member, a pin inserted to both of the support member and the turn member to turnably support the turn member on the support member, a flange fixed to the pin, a collar inserted to an insertion hole formed in the flange, a retainer bolt inserted to the collar and attached by being screwed to the turn member and the support member, a contact portion included in the flange, and a regulator included in the support member. The regulator contacts to the contact portion with a clearance kept between the collar and an inner circumference surface of the insertion hole, thereby regulating turning of the flange around the pin.

To enable maintenance of a control valve in a narrow space, on a slewing frame an engine is disposed at a rear portion, a swivel joint is disposed between a pair of vertical plates, a slewing motor is disposed diagonally behind the swivel joint between the paired vertical plates, and a control valve is disposed diagonally behind the swivel joint between the paired vertical plates and forward of the engine. A detachment direction A of a plurality of spools of the control valve extends obliquely in such a way as to get closer to a right vertical plate as it goes rearward.

A center pintle hub to be affixed to a base of a machine. The center pintle hub includes a base portion and a support portion. The base portion is formed to be affixed to the base. The support portion extends from the base portion and has a frusto-conical shape that can receive a center pintle shaft. The center pintle shaft can support a frame of the machine and provide rotation of the frame with respect to the base.

The invention relates to a mobile working machine that comprises an undercarriage, a superstructure rotatably supported on the undercarriage, a boom pivotably supported at the superstructure, and an operator's cabin mechanically connected to the superstructure via a lifting apparatus. The operator's cabin is adjustable in its height above the ground by means of the lifting apparatus, with the operator's cabin being able to be moved by means of the lifting apparatus from a working position spaced apart from the ground into a mounting position in which the operator's cabin sits on the ground. The lifting apparatus further comprises in accordance with the invention a lifting arm that is arranged between the operator's cabin and the superstructure and that is pivotably supported at the superstructure about two non-parallel pivot axes independently of one another.

Power machines, power sources for power machines, and methods which provide a hydraulic signal from a hydraulic system, through the swivel joint or swivel, to control a tensioning cylinder coupled to the undercarriage without requiring a modification to the swivel. In exemplary embodiments, the same hydraulic signal provided to at least one other hydraulic component on the undercarriage to control another machine function is also provided to control one or more tensioning cylinders. For example, exemplary disclosed embodiments provide the same hydraulic signal to tension a tensioning cylinder as is provided to shift one or more two-speed drive motors. This prevents or reduces the likelihood of de-tracking without requiring a change or redesign of the swivel.

A working machine includes a traveling device having a traveling frame, a turn base plate supported on the traveling frame and configured to turn around an axis extending in a vertical direction, the turn base plate having an opening portion through which the axis extends, and a swivel joint including an outer sleeve fixed to the turn base plate, and an inner shaft inserted to the opening portion and inserted to the outer sleeve so as to rotate about the axis, the inner shaft being configured to restrictively rotate with respect to the traveling frame. The outer sleeve has a flange portion fixed to the turn base plate on a periphery of the opening portion and covering the opening portion.

Disclosed embodiments include power machines with a lower implement pivotally coupled to an undercarriage frame by a lower lift arm structure and which include one or more cylinders or actuators that are operable to pivot the lower lift arm structure and lower implement relative to the undercarriage frame. A configuration of the one or more cylinders which mounts the cylinders behind the lower implement, with attachments to the undercarriage and to the lower lift arm structure at positions which allow the cylinders to be surrounded and protected by the undercarriage, reduces damage to the cylinders during operation.

A hydraulic excavator includes: a revolving frame; a work implement including a first actuator and a second actuator; a control valve; and a first pipe through which hydraulic oil flows between the control valve and each of the first actuator and the second actuator. The first pipe includes: a first conduit connected to the control valve; a second conduit and a third conduit that are connected to the first actuator and the second actuator, respectively; and a first branch portion at which the first conduit branches into the second conduit and the third conduit. A first region and a second region are on one side and the other side respectively with respect to the virtual straight line passing through a center of swing of the revolving frame. In the first region, a work implement is disposed. In the second region, the control valve and the first branch portion are disposed.

An engine cover (23) is provided between a counterweight (7) and a rear surface part (15B) of a cab (15) to be capable of opening/closing in an upper-lower direction and a heat exchanger cover (28) is provided between the rear side of a left side surface part (15C) and a right side surface part (15D) of the cab (15) and a revolving frame (6). The heat exchanger cover (28) is formed of a horizontal-opening structure of being rotatable in a front-rear direction to the revolving frame (6) with a front end (28C) in the front-rear direction as a fulcrum and a rear end (28D) in the front-rear direction as a free end. A heat exchanger cover lock mechanism (32) is provided on the rear end side of the heat exchanger cover (28) to hold the heat exchanger cover (28) in a closed state, and in a state where both the heat exchanger cover (28) and the engine cover (23) are closed, the engine cover (23) covers the rear end (28D) of the heat exchanger cover (28) and the heat exchanger cover lock mechanism (32) from backward.