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A hydraulic system for a marine vessel incorporates a single hydraulic pump that can be driven by either first or second motive devices, such as an internal combustion engine or an electric motor. Depending on the circumstances, the pressure required by the hydraulic system is provided by the pump

A hydraulic system for a marine vessel incorporates a single hydraulic pump that can be driven by either first or second motive devices, such as an internal combustion engine or an electric motor. Depending on the circumstances, the pressure required by the hydraulic system is provided by the pump when it is driven by either the first or second motive devices. As a result, only two motive devices can provide the necessary driving capacity for the hydraulic pump under all operating circumstances, including those when the engine is not running.

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I claim: 1. A hydraulic system of a marine vessel, comprising: a fluid conduit; a hydraulic pump, said hydraulic pump being connected to said fluid conduit; a first motive device which is selectably connectable in force transmitting relation with said hydraulic pump, said first motive device being

I claim: 1. A hydraulic system of a marine vessel, comprising: a fluid conduit; a hydraulic pump, said hydraulic pump being connected to said fluid conduit; a first motive device which is selectably connectable in force transmitting relation with said hydraulic pump, said first motive device being an internal combustion engine and comprising a belt and pulley arrangement connecting said hydraulic pump in torque transmitting relation with said internal combustion engine, said engine having an aft-extending crankshaft extending in a first direction through an opening in a transom of said marine vessel, said engine having a forward-extending crankshaft extending in a second direction opposite to said first direction, said belt and pulley arrangement being connected to said forward-extending crankshaft; and a second motive device which is selectably connectable in force transmitting relation with said hydraulic pump. 2. The hydraulic system of claim 1, further comprising: a first clutch connected between said hydraulic pump and said first motive device to alternatively connect said first motive device to said hydraulic pump and disconnect said first motive device from said hydraulic pump. 3. The hydraulic system of claim 1, further comprising: a second clutch connected between said hydraulic pump and said second motive device to alternatively connect said second motive device to said hydraulic pump and disconnect said second motive device from said hydraulic pump. 4. The hydraulic system of claim 1, wherein: said hydraulic pump is configured to maintain a preselected pressure within said fluid conduit. 5. The hydraulic system of claim 1, wherein: said hydraulic pump is a pressure compensated pump. 6. The hydraulic system of claim 1, wherein: said second motive device comprises an electric motor which is connected in torque transmitting relation with said hydraulic pump. 7. The hydraulic system of claim 1, further comprising: a battery, said battery being connectable to said second motive device to provide electrical power to said second motive device when said second motive device is connected in force transmitting relation with said hydraulic pump. 8. The hydraulic system of claim 1, further comprising: a hydraulically driven device connected in fluid communication with said fluid conduit. 9. The hydraulic system of claim 8, wherein: said hydraulically driven device is selected from the group consisting of a power steering system, a trim tab, a power trim system, and a hydraulic transmission clutch. 10. The hydraulic system of claim 1, wherein: said fluid conduit comprises a first conduit for conducting a pressurized liquid from said hydraulic pump and a second conduit for conducting said pressurized liquid to a liquid reservoir. 11. A hydraulic system of a marine vessel, comprising: a fluid conduit; a hydraulic pump, said hydraulic pump being connected to said fluid conduit; a first motive device which is selectably connectable in force transmitting relation with said hydraulic pump; a second motive device which is selectably connectable in force transmitting relation with said hydraulic pump; a plurality of hydraulically driven devices connected in parallel to said fluid conduit; and a plurality of orifices each dedicated for individual flow control of a respective hydraulically driven device, said hydraulically driven devices having different pressure and flow requirements, said hydraulically driven devices are selected from the group consisting of a power steering system, a trim tab, a power trim system, and a hydraulic transmission clutch. 12. The hydraulic system of claim 11, wherein said fluid conduit comprises a first fluid conduit comprising a supply conduit supplying pressurized hydraulic fluid to said hydraulically driven devices, and comprising a second fluid conduit comprising a common return conduit returning hydraulic fluid to a single common reservoir. 13. The hydraulic system of claim 12, wherein said single common reservoir is at said hydraulic pump.