I have short frame 446 with a loader. You do not want to have a separate pump for the loader it will use to many Hp and take away from your engine Hp. If you install a travel control valve with the power beyond hook up it will be much better. there is a travel control valve the can be adapted, it will look and work just like a power beyond valve. I can do the conversion for you. With that valve you tractor will be more use full and there will not be so much power loss
What power loss? If the loader is not actually doing work, the pump is not using any significant horsepower. It may be spining at speed and moving fluid commensurate with that rpm, but there is no horsepower robbing pressure involved. If the tractor is doing loader work, the tractor can only use, maybe, up to 6-8 hp, and the pump a maximum of 6 hp for 5-6 seconds, if
the payload involved is close to a ton. For a more normal payload of 500 lb, the pump demand is less than 2 hp for the duration of the lift.
I have used the starter motor to turn the engine, hydro charge pump, hydro, and the auxiliary pump for the loader while lifting the front of the tractor off of the ground with the loader for service work when the engine wouldn't start. That's over 700 lb being lifted by the loader plus all the other work.
A starter motor drawing 150 amps makes about 2.5 hp.
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