Abstract: A cooling system for cooling the cutting edge of an impact type ripper tip includes a source of liquid coolant under pressure and conduit means for supplying the coolant to a spray head mounted below and behind the ripper tip in a position to distribute liquid coolant to the lower surface of the tip behind the cutting edge. The spray head is detachably mounted directly behind the ripper tip and projects downward beyond the lower surface of the tip.

Abstract: Apparatus is connected in the liquid system for separating gas from the liquid, for example. The gas laden oil is directed into a filter positioned within a housing. The filter is of a material sufficient for separating gas bubbles from the oil while passing the oil therethrough. The separated gas passes upwardly and through a gas outlet opening out the top portion of the housing. Degassed oil passes through the filter and from the housing at a location adjacent a bottom end of the housing.

Abstract: A lubricating and damping system for mechanisms which undergo large changes in orientation during operation is disclosed. The system includes a scavenge compartment built into the housing of the system and a plurality of scavenge pumps mounted within the housing having separate inlets so located that at least one of the inlets is submerged within the lubricating oil regardless of the orientation of the housing with the oil picked up by the scavenge pumps delivered through deaeration means and into a collection tank. A lubrication pump draws the oil from the collection tank and supplies it for lubrication of the mechanism and for the damping means of the system.

Abstract: A cart construction having improved structure for selectively retaining removable transport containers thereon including brake structure for selectively preventing movement of one or more roller elements supporting the transport container on the cart. The brake structure is biased to lock the rollers and an operator is provided for engagement by the user of the cart to effect release of the brake structure when desired to permit lateral movement of the transport container from the cart. A step structure is provided for permitting ascent by the cart user to facilitate reaching into the bottom of the transport container carried on the cart. A cart locking structure is associated with the step structure to lock the cart against movement while the user is so utilizing the step structure.

Abstract: Retaining means for releasably retaining an earthworking tool on a support member includes a socket and adjustably partially misaligned holes extending transverse of the socket and a radially resilient retaining pin extending through the holes.

Abstract: heavy duty crawler vehicles are supported and controlled by endless track chains located on opposite sides of the vehicle. Such chains consist of a plurality of track shoes attached to pairs of spaced coacting links that are interconnected by hinge pins and bushings. These pins and bushings pressed tightly into alternate but associated link ends require special tooling for initial assembly which tends to create additional problems with track disassembly and service. By using coacting track links with symmetrical inner and outer bosses at one end, sealed and lubricated laterally extending drive bushings and associated links with outwardly coupled bores are readily disassembled and serviced by detaching a central retaining member.