By my research, Pittman never made a "13000-series" motor. They did make a 14000-series motor (which is one size larger in diameter than the 9000-series widely used by Lionel and MTH from 1995-2010.)
There are variations of the 14000-series motor that have a stall current of 30 amps. As expected, variations with a higher-voltage winding have a lower peak current. It's hard to believe that a model train manufacturer would design and sell a loco that exceeds the capacity of most power packs in operation.
I guess what the original poster needs to do, is to see how much current his loco actually draws pulling a heavy load. It might turn out that it's necessary to install a smaller motor, or higher-voltage motor to bring this loco's current consumption below the threshold of modern DCC decoders.
