Bob_Skurka
Super Member
- Joined
- Jul 1, 2003
- Messages
- 7,615
I've always heard that 3-to-5 hp per 12" of mower deck was sort of an unofficial standard.
If that is so, then a 54" rotary cutter would be the absolute maximum upper limit and leave no room for heavy growth, wet stuff, etc. A 48" might be better suited to 13 pto/hp.
I have a 60" on a 19 pto/hp (NH TC24D) and find I can bog that down badly if I hit something, but it sails through grass pretty well. This only 6" more inches in cutting width than the 54" deck but with 6 extra HP available to the PTO.
I used a 60" on an Oliver and when I hit heavy grass the diesel engine died, but the blades were pretty dull at the time. I think there is about 22 pto/hp on that tractor with lots of torque.
If that is so, then a 54" rotary cutter would be the absolute maximum upper limit and leave no room for heavy growth, wet stuff, etc. A 48" might be better suited to 13 pto/hp.
I have a 60" on a 19 pto/hp (NH TC24D) and find I can bog that down badly if I hit something, but it sails through grass pretty well. This only 6" more inches in cutting width than the 54" deck but with 6 extra HP available to the PTO.
I used a 60" on an Oliver and when I hit heavy grass the diesel engine died, but the blades were pretty dull at the time. I think there is about 22 pto/hp on that tractor with lots of torque.