Abstract: A support structure for supporting vehicles one above the other during transport or storage, the structure comprising a base frame having four corner posts extending generally vertically when in use to support a separate upper frame on which an upper vehicle can be supported in an elevated transport position, and one or more separate lower frames arranged to be positioned within the base frame when in use on which a lower vehicle can be supported. The upper frame is guided up the corner posts when the upper vehicle is raised to the elevated transport position. The base frame, upper and lower frames are transportable in a collapsed state when not in use by folding the corner posts down and collapsing the base frame, upper frame and lower frame so that they occupy less space with the upper, and lower and base frames in a nested configuration.

Abstract: A support structure for supporting vehicles one above the other during transport or storage, the structure comprising a base frame having four corner posts extending generally vertically when in use to support a separate upper frame on which an upper vehicle can be supported in an elevated transport position, and one or more separate lower frames arranged to be positioned within the base frame when in use on which a lower vehicle can be supported. The upper frame is guided up the corner posts when the upper vehicle is raised to its upper transport position and support means associated with the corner posts fasten the upper frame in its transport position relative to the corner posts. The base frame, upper and lower frames are transportable in a collapsed state when not in use by folding the corner posts down and collapsing the base frame, upper frame and lower frame so that they occupy less space with the upper, and lower and base frames in a nested configuration.

Abstract: A fluid system and method of operation provides flow force compensation and load sense functions. Each work circuit includes an actuator, a control valve, and a first valve. A valve element of a control valve includes main metering orifices sized and shaped to provide flow force compensation. A load sense check valve associated with a load pressure signal conduit is downstream of the load check valve. The load pressure signal conduit of each work circuit is in fluid communication with one another, and a greater of the load signal pressure of the work circuits is communicated to the load sense check valve of the other work circuit. The control valve associated the lesser load can permit flow forces to reduce the effective area of the orifice, which increases the pressure difference across the valve to maintain approximately constant flow to the actuator.

Abstract: A hydraulic valve stack for a work machine is disclosed. The hydraulic valve stack has a base with a first mounting surface and a second mounting surface. The base is connectable to the work machine and has at least one fluid passageway extending through the base from the first mounting surface to the second mounting surface. The hydraulic valve stack also has a permanent valve assembly configured to control a permanent function of the work machine and an optional valve assembly configured to control an optional function of the work machine. The permanent valve assembly is connectable to the first mounting surface of the base, while the optional valve assembly is connectable to the second mounting surface of the base. Each of the permanent and the optional valve assemblies have at least one fluid passageway in communication with the at least one fluid passageway of the base.