Between the hydraulic pump and motor there is a bell housing containing a three-piece coupling. Inspect the coupling to see if one of the flanges has loosened off and slid apart. If it is necessary to re-connect the coupling, use removable Loc-Tite on the set screws, or if the coupling is damaged, it will need to be replaced.
With new saw installations, if there is no pressure showing on the system pressure gauge, it is likely that the phase wiring is backwards. Reverse any two of the three phase wires supplying power to the saw.
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