Productivity rises with width and with speed. But a tractor has a fixed amount of power, so a wider implement often has to be pulled more slowly. The best setup balances the two.
Width versus speed
Consider a tractor that can pull either:
- a 12 ft tool at 6 mph: 12 × 6 × 0.8 ÷ 8.25 = 6.98 ac/hr
- a 15 ft tool at 4.5 mph: 15 × 4.5 × 0.8 ÷ 8.25 = 6.55 ac/hr
The narrower tool finishes sooner because the tractor can keep it at a good working speed.
Signs of a poor match
- Underpowered: the engine lugs, wheels slip excessively and you cannot reach the implement’s recommended working speed.
- Overpowered: the tractor works easily at full speed but the implement is too narrow, so you spend more hours and fuel than necessary.
- Too heavy: lift capacity or stability limits, especially with large 3-point implements.
How to choose
- Check the implement manufacturer’s horsepower requirement per foot or per shank, and its recommended speed range.
- Compare with your tractor’s power at the drawbar or PTO, not just engine horsepower.
- Calculate acres per hour for each realistic width and speed combination.
- Consider your fields: very wide tools lose efficiency on small or irregular ground.
Don’t forget the rest of the system
A matched tractor and implement can still be held back by slow refills, long road trips or a single grain cart. Look at the whole operation when deciding where to invest.
Compare setups side by side in the Acres Per Hour Calculator or the tilling calculator.