Yanmar Tiller - RSA 1205 - Greenhorn needs an education.

[YanmarFever]

^^^^
Correctomundo , Yanmar tillers are for multi speed usage. 540 - 1000 rpm
Before doing 1000 rpm, make sure the ground is already tilled real good.

 

[bmaverick]

Running a 540 tiller at 1k rpms is not something I would do for any reason I can think of. 1k rpm units have different gear reduction ratios to adjust for the increased horsepower that usually is put to them. The 1k rpm units turn the tines with much greater force rather than for any increase in operational speed. When you get up in size of tillers running more and longer digging tines more power is required to turn it. It then hits those big rocks and giant roots MUCH harder, which develops too much back force for the 6 spline to take and they will frequently suffer catastrophic failures. The only difference between 540 and 1k rpm connections is 21 splines to take the abuse. Both use the same 1 3/8" shaft diameter.

With 16 splines and yet a 1 1/8" shaft I'm not 100% sure which is the correct speed this unit is designed for and I would really like to be.

Running a Yanmar tractor and a Yanmar tiller gets you the best benefits of running at any of the matched speeds.

My YM2610 has 4-PTO speeds. 540-685-1000-1270

Like YanmarFever said, 1000 will be a finish run. My machine's 685 may be a nice blend of both.