A puller for pulling an element, such as a pulley or seal, from an assembly to which it is fitted. The puller generally includes a central body having a longitudinal axis, an adjustment ring threaded on the body for moving longitudinally with rotation, slide followers coupled to the ring and moving longitudinally with ring rotation, a plurality of leg assemblies, each including a foot and two legs pivotly attaching the foot to the body so as to form a parallelogram, and a arm pivotly connecting each slide follower to a leg assembly for expanding or contracting the leg assembly. Each foot has one or more foot flanges, each with an engagement surface for engaging with the element to be pulled; the orientation of the engagement surfaces being predetermined so as to not disengage from the element and to provide uniform pull and minimum pressure.

A tool holder insertion device includes a frame extending from a proximal end to a distal end, the frame including first and second longitudinal arms extending between the distal end and the proximal end. The frame also includes a distal transverse arm connected to respective distal ends of the first and second longitudinal arms, a proximal transverse arm opposite the distal transverse arm, and an internal space extending from the distal transverse arm, the internal space forming an insertion opening. The tool holder insertion device also includes a drive assembly fixed to the frame, the drive assembly including a pushing surface that is movable within the internal space toward the distal end of the frame.

A prior art powered wrist pin knocker is improved with a new plunger that prevents wobbling. The new plunger responds to a return vacuum pressure. The improved plunger is symmetrical along a longitudinal axis. New embodiments include a new side mount valve head to reduce length, a remote air controller and a variable length cylinder for the cannon. The new valve head is a simplified valve head assembly that adapts to an end of the cannon mount or a side mount or a remote mount. Another embodiment provides a stand for a surface mount application. This embodiment can have an extended piston for loosening tail bearings down a long channel. A manual return embodiment can use a rod to manually return the plunger to the proximal end for another firing cycle.

A working head for a hydraulic power tool including a head frame and a first moveable die head configured to move along the working head frame. The first moveable die head configured to receive a first moveable die comprising a first body length. A second die head is adapted to receive a second die comprising a second body length. The first body length of the moveable die is different from the second body length of the stationary die.

A bit removal device may include a support, an extractor coupled to the support, and an actuator. The support is configured to engage a bit holder from a front side of the bit holder. The extractor is configured to engage a bit from the front side of the bit holder. The actuator is configured to move the extractor relative to the support to extract the bit from the bit holder.

A method for operating a hydraulically actuated work tool having a work jaw is provided. Once an increase in force applied as a result of a hydraulic pressure has been reached, the work process does not require any further force or a maximum permissible hydraulic pressure has been reached. The hydraulic pressure is applied by a pump piston that travels through a pump path and a return path in each pump cycle. The hydraulic pressure is recorded over a time for a change from a pressure increase range to a pressure-maintaining range corresponding substantially to a specific pressure value from the pump path into the return path. At the end of a pump cycle, if the reached pressure-maintaining range exceeds a predefined pressure-maintaining range, an indication is concluded that the tool needs to be checked for a break in the work jaw.

A method of removing cutting bits from a milling work machine includes engaging a cutting bit connected to a rotary drum of the machine with a bit removal tool, actuating the bit removal tool to disconnect the bit from the machine, sensing a plurality of characteristics of removing the bit from the machine, and determining that the bit has been disconnected from the machine based on the sensed characteristics.

A method for operating a hydraulically actuated work tool having a work jaw is provided. Once an increase in force applied as a result of a hydraulic pressure has been reached, the work process does not require any further force or a maximum permissible hydraulic pressure has been reached. The hydraulic pressure is applied by a pump piston that travels through a pump path and a return path in each pump cycle. The hydraulic pressure is recorded over a time for a change from a pressure increase range to a pressure-maintaining range corresponding substantially to a specific pressure value from the pump path into the return path. At the end of a pump cycle, if the reached pressure-maintaining range exceeds a predefined pressure-maintaining range, an indication is concluded that the tool needs to be checked for a break in the work jaw.

The invention relates to a mobile, in particular portable, pin pulling device for pulling/inserting pins for connecting components of a construction machine, in particular of a crane, wherein the pin pulling device is designed in compact construction and has at least one electric drive having a rechargeable battery and a linear actuator drivable by the drive to move at least one pin.

Certain exemplary embodiments can provide a system comprising a frame, which can comprise a backbone, which defines a backbone longitudinal axis. The frame can further comprise a handle coupled to the backbone. The handle is positioned to allow a user to lift and position the frame. An actuator is coupled to the backbone. The actuator defines an actuator longitudinal axis.