The loader will not even come close to fitting without major modification. The 145 loader was made for the Mannheim designed utility tractors. The JD 5420 is a Augusta designed and built tractor. Completely different types of mounting.
 

To add to what the other poster stated if the 145 loader had an ind hyd valve it's a good possibility that the valve would be closed-center and the 5420 requires an open-center valve
 

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