Abstract: An vent mechanism comprising an upper housing, a lower housing, a diaphragm comprising a diaphram contact contained between the housings, an upper contact, an insulator insulating the upper contact from the upper housing, and an internal ground wire between the diaphram contact and the lower housing. When used as part of a electrical circuit with an indicator, the diaphram senses oil vapor pressure build up. When a given level of pressure is obtained, the diaphram contact moves against the upper contact and the vent mechanism is grounded, completing the electrical circuit, enabling the indicator to function as intended.

Abstract: A rotary flow combiner allows flow from multiple pressure compensated hydraulic pumps; with or without load sensing to be combined into a single outlet. The flows are combined in such a way that each input to the rotary flow combiner has equal flow. The flow from each pump is optimized in such a way that the output from the rotary flow combiner can achieve the maximum range of flow and pressure and so that all the pumps in the multiple pump system are supplying fluid flow at all times. A check valve can allow the rotary flow combiner to pull hydraulic fluid direct from a reservoir in parallel to a lower flow pump such that the volume of flow from the lower pump combined with the fluid drawn directly from the reservoir will match the flow from the higher flow pump.

Abstract: The present invention comprises at least one cylinder, such as a hydraulic cylinder connected between a vehicle or machine upper structure frame and a dual track undercarriage which is used to shift the weight of a tracked vehicle so that the vehicle or machine turns easier, suffers less componentry wear, and inflicts less damage on a surface under the tracked vhiicle or machine. A simple electronic control can be used to permit an operator to indicate the desired direction of turn, which then actuates a sensor which signals an electric solonoid operated hydraulic valve which then directs hydraulic fluid to the cylinder which shifts the weight as required for the direction of turn.