A plug assembly configured for installation in a hammer assembly, the plug assembly comprising a cylindrical plug and an anti-rotation component. The cylindrical plug may include a plug head and a plug body. The cylindrical plug may include a receiving feature located in the plug head. The anti-rotation component may include a first locking feature and a second locking feature. The first locking feature may be configured to fixably engage with the receiving feature. The second locking feature may be configured to engage with the hammer assembly.

A plug assembly configured for installation in a hammer assembly, the plug assembly comprising a cylindrical plug and an anti-rotation component. The cylindrical plug may include a plug head and a plug body. The cylindrical plug may include a receiving feature located in the plug head. The anti-rotation component may include a first locking feature and a second locking feature. The first locking feature may be configured to fixably engage with the receiving feature. The second locking feature may be configured to engage with the hammer assembly.

A greasing mechanism for a main electric motor of a vehicle includes a greasing tube that is filled with a semi-solid lubricant and has an indicator member within the greasing tube. The indicator member has a specific gravity that is smaller than that of the semi-solid lubricant and moves in a greasing direction from a first position due to pressure of the semi-solid lubricant during greasing. The greasing mechanism includes a retaining part that has a shape that stops at a second position the indicator member moving during greasing. An indicator window arranged in a portion of the greasing tube including the second position is formed from a component that is at least partially transparent to visible light.

Grease distribution systems for lubricating a plurality of fracking valves on a wellhead may include a distribution manifold configured for mounting on or adjacent to the wellhead. The grease distribution manifold may include a plurality of manifold valves. A grease pump may be disposed in fluid communication with the grease distribution manifold. A plurality of safety valves may be disposed in fluid communication with the respective manifold valves. Each of the safety valves is configured to be disposed in fluid communication with one of a plurality of fracking valves. The grease pump is configured to distribute grease through at least one of the manifold valves and its respective one of the safety valves, to the respective one of the fracking valves.

Grease distribution systems for lubricating a plurality of fracking valves on a wellhead may include a distribution manifold configured for mounting on or adjacent to the wellhead. The grease distribution manifold may include a plurality of manifold valves. A grease pump may be disposed in fluid communication with the grease distribution manifold. A plurality of safety valves may be disposed in fluid communication with the respective manifold valves. Each of the safety valves is configured to be disposed in fluid communication with one of a plurality of fracking valves. The grease pump is configured to distribute grease through at least one of the manifold valves and its respective one of the safety valves, to the respective one of the fracking valves.

A greasing system may be placed partially within the red zone and partially outside of the red zone. Grease and pneumatic power is supplied from outside of the red zone to a pod, inside of the red zone, having local storage, high-pressure pumping capacity, and a distribution mechanism. The grease is supplied from outside of the red zone to the pod at low-pressure through a hose having at least a 1 inch inside diameter and is usually at least 100 feet long. The pod pressurizes the grease to a high-pressure and distributes the grease via a distribution mechanism to a relatively short hose, generally less than 8 feet between the distribution mechanism and the greasing point on the wellhead, in order to minimize pressure losses.

Grease distribution systems for lubricating a plurality of fracking valves on a wellhead may include a distribution manifold configured for mounting on or adjacent to the wellhead. The grease distribution manifold may include a plurality of manifold valves. A grease pump may be disposed in fluid communication with the grease distribution manifold. A plurality of safety valves may be disposed in fluid communication with the respective manifold valves. Each of the safety valves is configured to be disposed in fluid communication with one of a plurality of fracking valves. The grease pump is configured to distribute grease through at least one of the manifold valves and its respective one of the safety valves, to the respective one of the fracking valves.

Grease distribution systems for lubricating a plurality of fracking valves on a wellhead may include a distribution manifold configured for mounting on or adjacent to the wellhead. The grease distribution manifold may include a plurality of manifold valves. A grease pump may be disposed in fluid communication with the grease distribution manifold. A plurality of safety valves may be disposed in fluid communication with the respective manifold valves. Each of the safety valves is configured to be disposed in fluid communication with one of a plurality of fracking valves. The grease pump is configured to distribute grease through at least one of the manifold valves and its respective one of the safety valves, to the respective one of the fracking valves.

In a construction machine where an arm, a working attachment, and a distal end portion of an extensible cylinder are coupled via a power link and an idler link, to achieve protection of a grease feeding piping when the grease feeding piping is arranged in the idler link, and to ensure that the structure of the idler link is not complicated. In an idler link, there is formed a protruding part which protrudes in a direction opposite to a bucket from a link body part of the idler link; there is provided a grease feeding piping arrangement space which extends in a link length direction, toward right and left inside of right and left outer side faces of the protruding part, with at least either one side of the side opposite to the bucket or right and left inward sides open; and a grease feeding piping is arranged in the grease feeding piping arrangement space, in a state of not protruding in a direction opposite to the bucket beyond a protruding distal end portion face of the protruding part and not protruding toward right and left inside beyond right and left inner side link faces of the link body part.

In a construction machine where an arm, a working attachment, and a distal end portion of an extensible cylinder are coupled via a power link and an idler link, to achieve protection of a grease feeding piping when the grease feeding piping is arranged in the idler link, and to ensure that the structure of the idler link is not complicated. In an idler link, there is formed a protruding part which protrudes in a direction opposite to a bucket from a link body part of the idler link; there is provided a grease feeding piping arrangement space which extends in a link length direction, toward right and left inside of right and left outer side faces of the protruding part, with at least either one side of the side opposite to the bucket or right and left inward sides open; and a grease feeding piping is arranged in the grease feeding piping arrangement space, in a state of not protruding in a direction opposite to the bucket beyond a protruding distal end portion face of the protruding part and not protruding toward right and left inside beyond right and left inner side link faces of the link body part.