dstig1
Super Member
- Joined
- Apr 7, 2010
- Messages
- 5,018
- Location
- W Wisc
- Tractor
- Kubota L5240 HSTC, JD X738 Mower, (Kubota L3130 HST - sold)
rbargeron - I'm using it on an L3130, my friend used it on a 9N 30 yrs ago.
I hadn't bothered to count the teeth previously, as it really isn't changeable, but just for giggles... I can't accurately count the sprocket teeth as I would have to totally disassemble the thing again to get to see it, and it is offsite now. What I can see from pics I took is that the small sprocket has 16 teeth and the big one looks like about 72 (I can see most of it in a picture and counting half of it I get about 36). So maybe only 4.5:1 - less than I thought. The book says 3130HST has 24 hp at the PTO, but doesn't list a torque for the PTO, only for the engine (75.9 ft-lbs). But even that is lower than what you are showing for the old 9N, so the 3130 must have only ~60% of the PTO torque of the 9N, at best. That explains a lot...
If I back it out: 24 hp = (torque x 2700 rpm)/5252, I get 47 ft lbs. [If I use the pto rpm (540) I get 233 ft lbs, so that can't be right.] 47 makes sense. 47/84 = 56% of the 9Ns rating. Again this makes sense as he said he would have easily been able to pull that oak with the old 9N (from memory).
Throttle was way up - about 2700 rpm or thereabouts. I mostly put it at full throttle, whatever the exact rpms are, I didn't check, but it was in that zone. I didn't really try lower throttle as that didn't seem logical to try, but I could try it.
The engine stayed running but the PTO shaft stopped moving, along with the winch drum and cable, naturally. ***Note it is a Hydro tranny on this tractor.
-Dave
I hadn't bothered to count the teeth previously, as it really isn't changeable, but just for giggles... I can't accurately count the sprocket teeth as I would have to totally disassemble the thing again to get to see it, and it is offsite now. What I can see from pics I took is that the small sprocket has 16 teeth and the big one looks like about 72 (I can see most of it in a picture and counting half of it I get about 36). So maybe only 4.5:1 - less than I thought. The book says 3130HST has 24 hp at the PTO, but doesn't list a torque for the PTO, only for the engine (75.9 ft-lbs). But even that is lower than what you are showing for the old 9N, so the 3130 must have only ~60% of the PTO torque of the 9N, at best. That explains a lot...
If I back it out: 24 hp = (torque x 2700 rpm)/5252, I get 47 ft lbs. [If I use the pto rpm (540) I get 233 ft lbs, so that can't be right.] 47 makes sense. 47/84 = 56% of the 9Ns rating. Again this makes sense as he said he would have easily been able to pull that oak with the old 9N (from memory).
Throttle was way up - about 2700 rpm or thereabouts. I mostly put it at full throttle, whatever the exact rpms are, I didn't check, but it was in that zone. I didn't really try lower throttle as that didn't seem logical to try, but I could try it.
The engine stayed running but the PTO shaft stopped moving, along with the winch drum and cable, naturally. ***Note it is a Hydro tranny on this tractor.
-Dave