A cap holder (21) that is attached to the inner surface side of a fuel filling door (19) in a state of facing an inner surface of the fuel filling door (19) with an interval in order to hold a cap (11K) removed from a fuel tank (11) and a lock (22) that locks the fuel filling door (19) from the outside in a state where the fuel filling door (19) closes a fuel filling opening (18) are provided on the fuel filling door (19). The lock (22) has a lock lever (22C) that rotationally moves between a locking position where the fuel filing door (19) maintains a state of closing the fuel filling opening (18) and an unlocking position where the fuel filling door (19) allows opening of the fuel filling opening (18). This lock lever (22C) is configured by a long member a base end of which is rotatably attached to the fuel filling door (19) and a leading end of which is allowed to enter a gap between the fuel filling door (19) and the cap holder (21).

Provided is a construction machine allowing a deck to be compact while facilitating water supply to a urea tank and access to a grease supply device. The construction machine includes a hose reel for grease supply disposed on a front-side portion of a deck of an upper slewing body, and a urea tank 30 disposed rearward of the hose reel on the deck and stores urea water for exhaust gas purification. The urea tank has a front surface provided with a water inlet for resupplying urea water. The hose reel is disposed deviated from the water inlet widthwise of the upper slewing body. The water inlet has a distal end located on the front side of a rear end of the hose reel.

The present disclosure provides a modular excavator, including a plurality of assembly modules that are detachably connected, the plurality of assembly modules including: a frame turntable base module; a track beam assembly module connected to the frame turntable base module; a track module connected to the track beam assembly module; a slewing drive module connected to the frame turntable base module; a power assembly module connected to the frame turntable base module; a counterweight module connected to the power assembly module; a cab module connected to the frame turntable base module; a fuel tank module connected to the frame turntable base module; a boom assembly module connected to the frame turntable base module; a bucket arm assembly module connected to the boom assembly module; and a work tool module connected to the bucket arm assembly module.

A fuel filling device (18) for refueling a fuel tank (14) is disposed in the vicinity of an exhaust gas post-treatment device (10). Specifically, the fuel filling device (18) is disposed over a hydraulic pump (11) provided to an engine (9) and at a height position equivalent to the exhaust gas post-treatment device (10). Therefore, the fuel filling device (18) can be heated for a short period of time by the exhaust gas post-treatment device (10) which is exposed to high temperature soon after the start of the engine (9).

A work machine provided with an exhaust gas purifying device includes a selective catalytic reducing device that performs treatment on exhaust gas of an engine, and a reducing agent injection device that injects a reducing agent into exhaust gas to be supplied to the selective catalytic reducing device. The work machine is provided with a housing that delimits an engine room accommodating the engine and the exhaust gas purifying device. The housing includes a top board that covers the engine room above the engine, and an exhaust duct that is provided in the top board and discharges the air in the engine room to the outside of the engine room. A part of a reducing agent supply pipe for guiding the reducing agent to the reducing agent injection device is disposed in the exhaust duct in a position above the reducing agent injection device.

Provided is a hydraulic excavator that enables arrangement of a camera at an appropriate position on a lateral edge of a revolving unit. The camera is installed on the lateral edge of the upper surface of the revolving unit. A handrail is attached to the upper surface of the revolving unit. The handrail includes a first handrail member extending in the front-rear direction of the revolving unit, and a first support member supporting the first handrail member on the revolving unit. The camera and the first support member are adjacent to each other in the right-left direction of the revolving unit, and the first support member is arranged inward relative to the camera.

A normal suction pipeline (27) through which urea water that is sucked from a urea water tank (22) toward a urea water pump (25) flows and a heater-equipped return pipeline (29) through which the urea water that is returned from the urea water pump (25) toward the urea water tank (22) flows are connected between the urea water tank (22) and the urea water pump (25). A supply pipeline (28) through which the urea water that is supplied toward a urea water injection valve (14) by the urea water pump (25) flows is connected between the urea water pump (25) and the urea water injection valve (14). The heater-equipped return pipeline (29) is equipped with a heating wire (29B) adapted to heat the urea water therein. The normal suction pipeline (27) is formed as a pipeline that is not equipped with the heater. The heater-equipped return pipeline (29) and the normal suction pipeline (27) are disposed in a state of contact with each other.

An upper revolving structure (4) includes a revolving frame (6), an engine (7), a fuel tank (11), an operator's seat platform (16) provided by covering an upper side of the fuel tank (11), an operator's seat (18) mounted on the operator's seat platform (16), and a cab (22) covering a periphery of the operator's seat (18). The fuel tank (11) is disposed between the revolving frame (6) and the operator's seat platform (16), brought closer to a left surface part (25) side of the cab (22). A level gauge (29) is provided on an outer surface of the fuel tank (11). A fuel filling opening (27) surrounding a fuel filling port (11J) of the fuel tank (11) and a level gauge opening (28) are provided on the left surface part (25) of the cab (22).

A cylinder has a piston part, a cylinder part, and a pipe section connected to the piston or cylinder parts. A portion of the pipe section encloses a pressure compartment which receives a fluid to apply a pressure on a pressure surface so the piston part is displaced in a first stroke direction. A first return pressure compartment receives a fluid to apply a pressure on a first return pressure surface so that the piston part is displaced in a second return stroke direction. The first return pressure compartment is positioned on the outside of the pipe section, and the area of the first return pressure surface is substantially equal to the area of the return pressure surface so that a volume-neutral operation of the cylinder is provided. Also described is a hydraulic system, an excavator comprising the cylinder and a procedure for operation of the cylinder.

A mounting system for a machine includes a tank support structure adapted to mount tanks proximate to an operator cabin of the machine, a first mounting bracket fixedly coupled to the tank support structure, and a second mounting bracket adapted to be removably coupled to the first mounting bracket. The tank support structure defines a hollow space. The tanks are received within the hollow space. The tank support structure includes a first surface and a second surface spaced apart from the first surface. The hollow space is defined between the first surface and the second surface. The first surface is configured to be coupled to a portion of the machine for mounting the tank support structure on the machine. The first mounting bracket and the second mounting bracket are adapted to receive a section of the tanks for retaining the tanks within the tank support structure.