Abstract: A lockup system for a vehicle suspension mechanism includes a frame, an axle assembly having a ground engaging wheel thereon, a radius arm pivotally connected to the frame and supporting the axle assembly and wheel, a resilient suspension device connected to the frame and one of the arm and axle assembly for cushioning oscillatory movement of the arm as the wheel traverses irregular terrain, and a lockup apparatus connected to the frame and to one of the arm and axle assembly independently of the resilient suspension device and being of a construction sufficient for maintaining a preselected length holding the arm substantially rigid or maintaining a freely telescoping length floating the arm and permitting full action of the resilient suspension device.

Abstract: A combined fluid motor and pumping apparatus including a unitary multi-land piston device having a motor piston end slidably mounted in a motor portion of an elongated tubular housing and an opposite pump piston end slidably mounted in an opposite pumping portion of the housing wherein the working area of the motor piston end is provided with a greater effective working area than the pump piston end so that upon directing a source of fluid at a predetermined pressure against the motor piston end of the piston device the pumping portion is effective to pressurize a work system to a higher pressure than the pressure at the source of fluid with the housing incorporating a fluid reservoir in the motor portion for making up fluid losses in the pumping portion.

Abstract: A fluid pressure operated actuator has a cylinder with a removable end cap and a piston rod extending axially through the end cap for transmitting piston movement to an external load and also has an internal compressed spring biasing the piston rod towards a predetermined position. To prevent violent expulsion of elements by the compressed spring upon removal of the end cap, stop means are provided on the piston rod to limit relaxation of the spring prior to the time that the end cap is fully removed from the cylinder.