NO WATER SINCE SPRING THAW ... garden/orchard/vineyard all DEAD dried up fire hazards now ...

Pump info:
Jensen Beam Balance Pump Unit - 10A32J24

Well info:
500' depth
405' to water
8" casing to 20'
5" casing to 460'
PVC casing
5+ GPM flow rate

Looking for the MOTOR specs that will drive this unit. The original was removed by previous owners and is missing. I've tried several different motors but they all have burnt up either within a minute or two, or after several hours of pumping. The well data does not have the equipment listed only the drill and casing data. So, I've been at a loss as to what size (hp) and rpm of the motor I should be looking at as a correct replacement. UGH