3 Point Linkage Pin Sizes
Sometimes hobby farmers seem a little confused regarding the sizes of the three point linkage hitch pins and the related parts on their tractor such as the top link, lower lift arms, etc and the lower lift arm spacing. Shown here is a simple table to use as a guideline to determine what category pins you have on the rear of your tractor.
| Category | Tractor power | Top link pin diameter | Lift arm pin diameter | Lower hitch spacing |
|---|---|---|---|---|
| 0 | Up to 20 hp (15 kW) | 5⁄8 in (16 mm) | 5⁄8 in (16 mm) | 20 in (510 mm) |
| 1 | 20 to 45 hp (15 to 34 kW) | 3⁄4 in (19 mm) | 7⁄8 in (22 mm) | 28 in (710 mm) |
| 2 | 40 to 100 hp (30 to 75 kW) | 1 in (25 mm) | 1 1⁄8 in (29 mm) | 34 in (860 mm) |
| 3 | 80 to 225 hp (60 to 168 kW) | 1 1⁄4 in (32 mm) | 1 7⁄16 in (37 mm) | 40 in (1,000 mm) |
| 4 | Larger than 180 hp (130 kW) | 1 3⁄4 in (44 mm) | 2 in (51 mm) | 48 in (1,200 mm) |
