RK 55HC,ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC
I'm thinking the smae as DK.. since many tractors have other pto gear pseeds.. like 760, and 1000.. etc.. they are telling you hat is a 540 max rpm..
Still.. run it at that rpm.. and just reduce the ground speed. At the correct rpm, the tiller will be most efficient. Plus makes much better sound when it finds burried treasure!