If both pumps are turning at the same time, all you need to do is connect the outlets. If one pump can be stopped, a check valve at the outlets will be needed to prevent reverse flow.
Flow combiners can used to syncronize the return oil from two cylinders. ( and a flow splitter used to sync oil to cyliners). A flow combiner won't work with a positive displacement pump as you would be forcing a restriction on the higher volume pump.
As a side note. Two stage pumps ( like on a log splitter with rapid extension) couple the output of two pumps for rapid extension. As do some hydraulic punch presses. When high presure is needed, the output of one pump is bypassed to the tank.
Any specifics as to what pumps / systems you want to combine?
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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