increasing the reverse speed of my HST mahindra

[82cj]

i own a 2009 Mahindra 2815 HST. i am looking to increase the reverse speed as the middle gear provides the necessary torque to climb hils while snowblowing but not enough speed. forward speed in the middle gear is adequate. using the high range gear does not provide enough power to climb the hills. So the real question is, is there an orifice that limits the oil flow to limit the reverse speed, or is the speed limited by the travel of the pedal in the reverse direction. has anyone else ever modified the drive system to increase the reverse speed?

 

[OldGinTractors]

The 2815 has a stop screw under the floorboard that can be adjusted to give the petal more travel.