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A slipping pump belt can severely limit pressure, and you'll never know it. On civilian 406 mogs it's common to find an SAE belt on the hydraulic pump, non-metric, and its a non-fit. A visual check: If the belt is buried in the v-pulley, it is either worn out or the wrong size. The correct...

A flow control valve is not like an orifice that works both ways. It acts as a check valve, with free flow in one direction but restricted flow in the reverse direction. Some are fixed flow, others are adjustable, and this looks like a fixed type. What rpm are you running when the hydro...

Could it be a check or restrictor valve in a return line? Purpose could be to stop bucket from falling immediately in float? Keeps bucket under control?