RPM Rules
| Tractor | PTO RPM | Engine RPM |
|---|---|---|
| Allis Chalmer | Std. Plus 20% | Std. Plus 20% |
| B & C & C.A. & R.C. | 0 | 2220 |
| W.C. & W.F. | 775 | 1890 |
| W.D. | 806 | 2064 |
| W.D. 45 | 798 | 2039 |
| Case | PTO Plus 20% | Engine Plus 20% |
| D & D.C. | 746 | 1668 |
| L & L.A. | 720 | 1440 |
| S.C. | 737 | 2112 |
| V.A.C. | 718 | 1920 |
| Ford | PTO Plus 20% | Engine Plus 20% |
| 8N | 1016 | 2796 |
| 9N | 959 | 2640 |
| I.H./Farmall | PTO Plus 20% | Engine Plus 20% |
| W-30 | 676 | 1560 |
| F-12 | 646 | 1860 |
| F-20 | 606 | 1548 |
| F-30 | 641 | 1518 |
| A | 0 | 1848 |
| B | 0 | 1848 |
| B.N. | 0 | 1848 |
| C | 0 | 2250 |
| Super C | 0 | 2250 |
| H | 738 | 2178 |
| Super H | 732 | 2237 |
| M | 727 | 1914 |
| Super M | 708 | 1920 |
| W-6 | 708 | 1914 |
| W-9 | 708 | 1980 |
| 200 | 712 | 2178 |
| 300 | 714 | 2310 |
| 400 | 707 | 1920 |
| John Deere | PTO Plus 20% | Engine Plus 20% |
| M | 660 | 1980 |
| M.T. | 660 | 1980 |
| A | 725 | 1296 |
| B | 710 | 1644 |
| D | 685 | 1176 |
| G | 726 | 1338 |
| 40 | 737 | 2430 |
| 50 | 713 | 1650 |
| 60 | 748 | 1338 |
| 70 | 748 | 1338 |
| Massey Harris | PTO Plus 20% | Engine Plus 20% |
| 33 | 734 | 2040 |
| 44 | 720 | 1800 |
| 44-6 | 0 | 2400 |
| 44-SP | 720 | 1800 |
| 333 | 728 | 2040 |
| 444 | 728 | 2040 |
| 101 SR | 0 | 2376 |
| 101 JR | 0 | 2460 |
| Minneapolis Moline | PTO Plus 20% | Engine Plus 20% |
| G | 782 | 1716 |
| U | 757 | 1680 |
| UB | 782 | 1716 |
| Z | 812 | 1980 |
| R | 792 | 1980 |
| Oliver | PTO Plus 20% | Engine Plus 20% |
| 70 | 694 | 1932 |
| 66 | 698 | 2100 |
| Super 66 | 878 | 2400 |
| 77 | 698 | 2100 |
| Super 77 | 700 | 2100 |
| 88 | 698 | 2100 |
| Super 88 | 700 | 2100 |
| Cockshutt | PTO Plus 20% | Engine Plus 20% |
| 30 | 718 | 2172 |
| 40 | 713 | 2220 |
| 50 | 713 | 2220 |