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I installed factory front hydraulics on my 416, and had my local fitting hydraulic company check everything out. Those valves would not handle a much higher volume pump. There were some different pumps with varying ratings available for that valve body, but the lower pump is way too big. I'd get your local hydro shop to build a manifold for the lower pump, and use solenoid or cable operated valves from the cab. A related issue: can you drive the 406 and have the lower PTO pump engaged at the same time?