Abstract: A horizontally adjustable seat support may be rotated 180.degree. to lock in either a forward facing position or a rearward facing position. A latching mechanism restricts frame movement from horizontal or pivotable movement but may be partially displaced for free horizontal adjustment without releasing the pivotable lock.Horizontal seat tracks may engage the lower or alternatively the upper portions of rollers carried between the seat tracks, depending on the lateral position of the seat frame.

Abstract: A transmission disconnect control capable of placing a transmission in a neutral condition in response to application either of a pressure-applied service brake system or of a spring-apply parking brake system including a pilot operated disconnect valve which receives a pilot signal from either a parking brake signal valve or from the service brake valve, with a shuttle valve movable to select a signal from either the service brake valve or the parking brake signal valve.

Abstract: An elastomeric bushing encircles a piston of a mechanically operated disc brake system forming a seal between the piston and its host cylindrical bore. The elastomeric bushing provides for a small amount of lateral piston travel and will provide a retraction means to return the brake piston to a position of repose.

Abstract: An upper link storage device having a post secured to the cross bar of an inverted U-shaped bracket. A sleeve slidably retained on the upper link engages the post to positively arrest the upper link.

Abstract: A system is provided for monitoring and controlling the level of a working element of an agricultural implement including a digital comparator which compares stored digital signals with digital signals corresponding to the actual position of the working element. A secondary valve is controllable from the digital comparator to limit lowering movement. The actual position digital signals are developed by counters which count clock pulses during a pulse developed by a transducer circuit and having a duration corresponding to the vertical position of the working element. Such actual position digital signals are applied to latching circuits from which a signal may be applied upon operation of a memory reset button to memory latch circuits operative to provide the stored signals and such signals may also be applied to display latching circuits.

Abstract: A primary face type seal is maintained in face to face engagement by secondary elastomer seals. A multi-part retainer encircles the primary and secondary seals to provide a unitizing housing for permanently locating the enclosed seals in appropriate alignment.

Abstract: A multi-functioning hydraulic transmission control circuit including interacting valve mechanism parts which, in response to a shift being called for in a clutch-cylinder-controlled multi-speed transmission, inaugurate a fill pressure flow to the clutch cylinders concerned, prior to the subsequent fluid pressure rise effected therein; thereafter, upon completion of the fill, the parts modulate pressure rise of the hydraulic clutch fluid from and at approximately actual clutch fill pressure up to, and remaining at, the final pressure of engagement.

Abstract: Priority valve system with pressure-flow compensation and signal control having first, a restricted orifice which can be satisfied when flow requirements therethrough are sufficiently large in combination with, second, a closed center primary control valve equipped with an hydraulic detent unlatch mechanism and hydraulically disposed downstream of the orifice to receive the flow directed thereto by the orifice, all to provide appropriate signals controlling the priority valve.Through this intervening, novel two component control combination, the priority valve is controlled to supply flow to a priority load and, in addition, has an auxiliary outlet chamber connected to an auxiliary motor with the purpose to cut off the auxiliary chamber flow whenever the priority flow is sufficient to satisfy only the restricted orifice.

Abstract: A variable displacement pump is compensated to provide a relatively constant predetermined flow of hydraulic fluid under pressure to an open-center hydrostatic steering system, as the speed of the engine driving the pump varies, and a relief valve by-passes the steering system whenever the steering system would normally reduce the flow to hydraulic apparatus connected in series with and downstream of the steering system.

Abstract: An agricultural tractor is provided with a hitch and draft control system hydraulically related to a plurality of other hydraulic functions. The hydraulic fluid distribution is preferenced by a priority valve including a variable orifice in series with the hitch and draft control system. The variable orifice acts as a raise rate control device and also as a controlling member for a load sensing variable displacement pump.

Abstract: A backhoe frame is attached to the main frame of a host tractor vehicle at four points. A pair of upper mounting pins each pass consecutively through an outboard restraining plate in the vehicle main frame, a backhoe mounting collar integral with the backhoe frame and an inboard restraining plate. The mounting pin is a tight fit in the restraining plates and a loose fit in the backhoe mounting collar.

Abstract: This improvement of a vehicle cab temperature control system for a cab having an operator enclosure with a roof and an outwardly exposed air filter attached to the roof includes a blower and a temperature control unit mounted within a duct which is secured to both the roof and to the air filter. The duct is spaced apart from the roof, thereby forming a chamber which receives controlled air from the temperature control unit. The flow of controlled air is produced by the blower as it moves the air through the air filter into the duct through its inlet aperture and then through the temperature control unit within the duct. The controlled air then exits the duct through either the duct's bleed aperture into the chamber or through the duct's outlet aperture into the operator enclosure.

Abstract: A boom prop for supporting in an elevated position a pair of boom arms interconnected by a cross tube, including a link pivotally mounted on a vehicle with a saddle member secured to its free end capable of engaging and supporting the cross tube. An adjustable stop means positions the saddle member in the path of the cross tube so that the link and saddle are cammed out of the path of the cross tube as the boom arms are raised and gravity returns the saddle to the position determined by the stop means when the boom arms are subsequently lowered.

Abstract: A primary face type seal is maintained in face to face engagement by secondary elastomer seals. A multi-part retainer encircles the primary and secondary seals to provide a unitizing housing for permanently locating the enclosed seals in appropriate alignment.

Abstract: A variable displacement pump supplies fluid to the single acting draft control cylinder of an agricultural tractor through a valve for controlling flow to and from the draft control cylinder. The valve houses a control rod activated valve spool that when displaced allows fluid to unseat a check valve between the spool valve and the draft control cylinder.Fluid is exhausted from the draft control cylinder when the control rod causes unseating of a main poppet by unseating a pilot valve in the main poppet. Fluid being exhausted from the draft control cylinder then passes through the valve to tank.

Abstract: A filter thermal bypass valve has an opening defining a seat, a thermal actuator including a plunger capable of being forced toward the seat in response to increases in temperature, a spring retainer capable of movement toward and away from the seat, a rod member affixed to the spring retainer and having an enlarged head portion with a valve plate slidable thereon, a first compression spring forces the retainer in contact with the plunger and a second compression spring urges the valve plate against the seat.

Abstract: A vehicle frame having longitudinally spaced apart parallel tapered channel frame members extending forwardly from a unitized backhoe mounting rear frame section to a front yoke. The tapered channel frame members are narrow at the front yoke and become wider toward the midsection of the frame. These frame members are at their widest just forward of a rear axle location on the frame.A unitized backhoe mounting rear frame section and a loader tower locate the tapered channels relative to the longitudinal center line of the frame.

Abstract: An improved master cylinder in which a pair of orifices extend through the cylinder wall and means is provided on the exterior of the cylinder to permit fluid communication therebetween. The orifices are located near the end of the cylinder to permit restricted flow around the piston in the master cylinder when it is near or at the end of its stroke to cause both the master and slave piston to complete their strokes and at substantially the same time. A similar pair of orifices and an exterior communication means at the other end of the cylinder provides for re-phasing during piston movement in the opposite direction.