Abstract: Modulated hydraulic clutch pack engagement is provided in a single valve body which includes a drive direction selector spool, a dump valve, a pressure modulating spool, a downstream system pressure regulator and a provision for continuous flow to a downstream torque converter. The modulator spool interrupts communication between a first and second chamber. Fluid pressure develops in the first chamber in response to selector spool initiation of clutch pack fill line pressure. A pressure differential is generated between the first and second chambers resulting in modulator spool displacement allowing equalization of chamber pressures. Metered flow to the back side of the modulator spool generates pressure that reseats the spool with the aid of spring pressure. Pressure then builds in the first chamber. The modulation is repeated rapidly resulting in the clutch pack being fully pressurized, however, the modulator will continue to regulate fluid to be supplied to the torque converter.

Abstract: A chain tension maintenance device for use with the bowl loading elevator of the excavating scraper variety which is adjustable to vary the slack in the chain and paddle structure. At least one idler arm having bell crank geometry is pivotally mounted to the elevator frame through a first pivot point. An idler wheel axially mounted at a second pivot point of the idler arm, is urged into tension maintaining contact with the elevator chains by force exerted through the third pivot point of the idler arm by an adjustable turnbuckle grounded to the elevator frame.

Abstract: This multi-purpose grab bucket of the type comprising a pair of hydraulically actuated symmetrical pivoting shells or scoops has a main central vertical hydraulic cylinder and piston actuator and lateral oblique hydraulic cylinder and piston actuators, and valves for selectively supplying hydraulic fluid under pressure to the central actuator or the lateral actuators for operating the assembly as a "digging" bucket or as a "rehandling" bucket, or in a third mode intermediate the "digging" and "rehandling" modes.

Abstract: Disc brake sliding caliper retention is provided by a pair of torque bars fixedly mounted to a non-rotating member adjacent a rotating disc member. The torque bar pair constrains at least one sliding caliper from rotation with the disc when the caliper clamps down on the disc but allows axially movement relative to the rotational axis of the disc. The torque bars are mounted to the non-rotating member such that caliper forces resulting from engagement with the disc are perpendicular to the torque bars thus eliminating turning or shifting of the torque bars.

Abstract: A simple load sensitive hydraulic system having a variable displacement pump, a priority dependent work circuit, at least one secondary work circuit, priority means preferencing fluid flow to the priority dependent work circuit over the secondary work circuit, flow and pressure compensating means responsive to requirements of either work circuit for controlling displacement of the variable displacement pump and a relief valve which when overridden allows fluid flow to the secondary work circuit.

Abstract: For inclusion as spacer between first and second axially spaced apart members mounted for limited angulation about a common axis, the first member having a seal recess formed in one face, the second member having an end face opposite the seal recess, the improvement of: a laminated torsielastic bushing arranged in one piece, and in the recess.

Abstract: Fluid passages machined in the annular brake piston and in the outboard brake ring of a wet disc brake system allows the circulation of cooling and lubricating fluid. An annular disc brake will deliver cooling fluid to the circumferential periphery of the brake disc operating cavity where the fluid relief passages machined in the annular brake piston and in the outboard brake ring will allow the passage of this fluid out of the brake disc operation cavity thus preventing the stagnation of cooling fluid in the brake disc operating cavity.

Abstract: Shroud, associated with a type of automotive fan and a vehicle radiator core, supports in a position between the fan and core an interposed debris screen which is slidable in guides in the shroud so as to be readily removable transversely out of the hood of an automotive vehicle for cleaning of the screen. Air enters the fan shroud under pressure by being blown in through fan opening means defined by the shroud at one end, and leaves under pressure in a path through radiator attachment means carried by the shroud at the other, or discharge, end. Intermediate the ends of the shroud, the debris screen is interposed with its plane between the respective planes of the opening means and attachment means, so as to screen all air being forced under pressure in the path therethrough.

Abstract: A plant digging and cleaning machine having a superstructure carried by ground laying tracks on either side thereof, an engine and two hydrostatic transmissions provided for each ground laying track carried above such tracks and permitting a space therebetween for the passage of plants and cleaning apparatus within said space, and an operator's platform above said space on said frame having hand and foot operated controls for controlling the speed and direction of the vehicle as well as controlling the digging and cleaning apparatus.

Abstract: A system for disconnecting or neutralizing a transmission including a normally open switch, which is closed upon depression of the secondary brake pedal, wired in series with a brake light switch and the coil of a solenoid operated valve. When the coil is energized the valve is shifted to cause the transmission to be neutralized.

Abstract: Multi-sectional resilient retainer pin for excavating tooth, whereof the multiple sections define a ring effective for 360.degree. lateral stability of the pin and solid self-centering and self-retention.

Abstract: A tractor vehicle having an engine in a heat and sound controlling enclosure. A plurality of access apertures are provided therein including a pair or evacuation apertures for allowing the passage of heated air out from the enclosure. A second enclosure through which a flow of ambient air is drawn has an air intake and filter and a plurality of heat exchanging units housed therein. A flow inducing fan draws air through the chamber and the heat exchangers and directs it directly out the front grille of the vehicle.

Abstract: A dump truck having a canopy on the dump body which extends over an operator's cab is provided with a latch means for holding the dump body in its lowered transport position and is released only in response to initiating the intentional pivoting of the dump body to its raised position.

Abstract: This grab bucket comprises a pair of shells or scoops pivoted to the lower portion of a frame structure and operatively connected to a vertical hydraulic cylinder and piston actuator of which the piston rod is held against translation in relation to said frame structure, the upper end of the cylinder of said actuator carrying the pivot pins of links connected to said pair of shells or scoops. The frame structure comprises on the one hand an upper rocker rigid with the piston rod of said hydraulic actuator and on the other hand a frame structure body detachable from said rocker. The shells themselves are detachable from the base of the hydraulic cylinder to permit the operation of the grab bucket not only as a digging bucket but also as a rehandling bucket after disassembling the frame structure body and connecting the links to the rocker.

Abstract: This grab bucket comprises a pair of shells or scoops pivoted to the lower portion of a frame structure and operatively connected to a vertical hydraulic cylinder and piston actuator of which the piston rod is held against translation in relation to the frame structure, the upper end of the cylinder of said actuator carrying the pivot pins of links connected to the pair of shells or scoops. The frame structure comprises on the one hand an upper member rigid with the piston rod of said hydraulic actuator and on the other hand a frame structure body detachable from the upper member. The shells themselves are detachable from the base of the hydraulic cylinder to permit the operation of the grab bucket not only as a digging bucket but also as a rehandling bucket after disassembling the frame structure body and connecting the links to the upper member.

Abstract: A linkage for supporting the hoses extending between a fixed portion of a machine and a shiftable carriage mounted on the fixed portion. A pair of links are pivotally interconnected with one of the links pivotally connected to the carriage and the other pivotally connected to the fixed portion. A clamp means is carried by the pivotal interconnection of the links and secures the hoses to the linkage to control the flexure thereof as the carriage is shifted.

Abstract: An air circulation control unit, that can be secured over the grill frame of a vehicle, has an upper portion defining a vertical passage and a protruding lower portion. Exhaust outlets are provided at a plurality of different levels and baffles are positioned with said unit to separate the cooling air flow into a plurality of air streams for exit through the outlets.