Good to know. Thank you!The 2501 has the same hydrostat unit as the 3301/3901 and the same 28:27 input ratio. The 2501 relief pressure is only 100 psi less than the 3301/3901, but yours may be at the lower end of the spec.
I wonder what the HP/torque curves look like.
I'm hoping that I'll be able to see the HP/TQ curves when the tractor is placed on the PTO dyno.