A mining or construction vehicle comprising a boom extending in a first direction, which boom, via a first and a second rotation device, is connected to a hydraulic device arranged on a mounting device arranged at a free end of said boom, the first rotation device being arranged to provide a rotation around a first axis that is substantially parallel to the first direction, and a second rotation device being arranged to provide a rotation around a second axis that is arranged at an angle with respect to the first axis. Hydraulic conduits for supply of hydraulic fluid to said hydraulic device on said mounting device are arranged through at least one of the first and second rotation devices.

A control arrangement for an arrangement of hydraulically couplable machines has an interface for hydraulic coupling of the machines, and a hydraulic machine for supplying pressure medium to at least one hydraulic consumer of the machines in accordance with requirements. An electronic control device is configured, in accordance with a load of the consumer, to generate an electronic control signal, which can be converted by a transducer of the control arrangement into a hydraulic control signal, in accordance with which the hydraulic machine can be operated.

Disclosed is a mechanical impulse motor for producing kinetic rotational energy by driving one or more pulleys using compressed air comprising: an air compressor powered by an electric battery; two pneumatic pistons configured to receive compressed air from the air compressor; two lever arms each of which driven by one of the pneumatic pistons; two ratchets each of which driven by one of the level arms; a shaft securely connected to the two ratchets, the shaft being driven by the lever arms to rotate in a direction constrained by the two ratchets; and a pulley securely connected to the shaft.

Disclosed is a mechanical impulse motor for producing kinetic rotational energy by driving one or more pulleys using compressed air comprising: an air compressor powered by an electric battery; two pneumatic pistons configured to receive compressed air from the air compressor; two lever arms each of which driven by one of the pneumatic pistons; two ratchets each of which driven by one of the level arms; a shaft securely connected to the two ratchets, the shaft being driven by the lever arms to rotate in a direction constrained by the two ratchets; and a pulley securely connected to the shaft.

A work vehicle includes computing system is configured to receive a first and seconds inputs associated with controlling an operation of first and second hydraulic loads. Furthermore, the computing system is configured to control the operation of the first or second flow control valve corresponding to the one of the first or second hydraulic loads associated with the greater hydraulic fluid pressure based on the corresponding received first or second input. Additionally, the computing system is configured to determine the first or second pressure of the hydraulic fluid being supplied to another of the first or second hydraulic loads. Moreover, the computing system is configured to control the first or second flow control valve corresponding to the other of the first or second hydraulic loads based on the corresponding received first or second input and the determined first or second pressure.

Disclosed is a mechanical impulse motor for producing kinetic rotational energy by driving one or more pulleys using compressed air comprising: an air compressor powered by an electric battery; two pneumatic pistons configured to receive compressed air from the air compressor; two lever arms each of which driven by one of the pneumatic pistons; two ratchets each of which driven by one of the level arms; a shaft securely connected to the two ratchets, the shaft being driven by the lever arms to rotate in a direction constrained by the two ratchets; and a pulley securely connected to the shaft.

Disclosed is a mechanical impulse motor for producing kinetic rotational energy by driving one or more pulleys using compressed air comprising: an air compressor powered by an electric battery; two pneumatic pistons configured to receive compressed air from the air compressor; two lever arms each of which driven by one of the pneumatic pistons; two ratchets each of which driven by one of the level arms; a shaft securely connected to the two ratchets, the shaft being driven by the lever arms to rotate in a direction constrained by the two ratchets; and a pulley securely connected to the shaft.

The invention discloses systems for improving performance and operational efficiency of wireline tractors. A cooling system improves power capabilities of electrical motors mounted in wheels, which are mounted on a linkage pivotably connected to an arm extended from a tractor tool body, in an in-line arm configuration. The linkage and arm mechanism significantly improve the tractor's ability to traverse wellbore obstructions. The hydraulic system of the tractor ensures adequate wellbore centralization.

The invention discloses systems for improving performance and operational efficiency of wireline tractors. A cooling system improves power capabilities of electrical motors mounted in wheels, which are mounted on a linkage pivotably connected to an arm extended from a tractor tool body, in an in-line arm configuration. The linkage and arm mechanism significantly improve the tractor's ability to traverse wellbore obstructions. The hydraulic system of the tractor ensures adequate wellbore centralization.

A hydraulic system for a working machine includes hydraulic actuators actuated with hydraulic fluid delivered from a hydraulic pump, and control valves each of which is shiftable among shift positions to control a flowrate of hydraulic fluid flowing to the corresponding hydraulic actuator. Each control valve includes an input port, an output port, and a flowrate reduction section. When the control valve is shifted to a reduction position, the flowrate reduction section reduces a flowrate of the hydraulic fluid entering the input port and outputs the flowrate-reduced hydraulic fluid to the output port. At least one of the control valves includes a flowrate increase section. When the control valve is shifted to an increase position, the flowrate increase section outputs the hydraulic fluid having entered the input port to the output port at a flowrate larger than that of hydraulic fluid output by the flowrate reduction section.