The Case IH 685 tractor engine horsepower is 68.1 hp | 50.8 kW, PTO horsepower is 63.3 hp (max) 47.2 kW, and the drawbar horsepower is 52.90 hp | 39.4 kW.
Case IH 685 Horsepower Specs
| Engine horsepower | 68.1 hp | 50.8 kW |
|---|---|
| PTO horsepower claimed | 63.3 hp (max) 47.2 kW |
| PTO horsepower tested | 61.02 hp | 45.5 kW |
| Drawbar horsepower tested | 52.90 hp | 39.4 kW |
Case IH 685 Useful Horsepower Calculations
| PTO-to-engine power transfer | 93% of engine hp reaches the PTO |
|---|---|
| Drawbar-to-engine power transfer | 77.7% of engine hp reaches the drawbar |
| Drawbar-to-PTO power ratio | 83.6% drawbar hp vs PTO hp |
| Engine size per PTO horsepower | 3.8 ci per PTO hp |
| PTO horsepower per liter | 16.2 PTO hp per L |
| Engine size per engine horsepower | 3.5 ci per engine hp |
| Engine horsepower per liter | 17.5 engine hp per L |
| Fuel tank per PTO horsepower | 0.3 gal per PTO hp |
| Rated speed per PTO horsepower | 37.9 rpm per PTO hp |
Case IH 685 Engine Specs
| Displacement | 238.8 ci | 3.9 L |
|---|---|
| Bore and stroke | 3.875×5.06 inches | 98 x 129 mm |
| Compression | 16:1 |
| Rated RPM | 2400 |
Case IH 685 Fuel, Cooling, Starting & Service Specs
| Fuel capacity | 20 gal | 75.7 L |
|---|---|
| Starter volts | 12 |
Case IH 685 Horsepower Comparison Charts
Engine horsepower comparison
PTO horsepower comparison
Drawbar horsepower comparison
Displacement comparison
Rated RPM comparison
Engine size per PTO HP
Benchmarks use practical low, average and high ranges for the utility tractor category. Use the operator manual and actual engine/tractor configuration before sizing implements or judging working power.
Case IH 685 Horsepower FAQ
How much horsepower does the Case IH 685 have?
The listed engine output is 68.1 hp, below the 80 hp benchmark average. That is a lower-power result, so the smarter match is lighter implements and jobs that do not demand more than about 68.1 hp.
How much PTO horsepower does the Case IH 685 have?
The listed PTO output is 63.3 hp, close to the 65 hp benchmark average. Use 63.3 PTO hp as the practical implement-sizing number.
How much drawbar horsepower does the Case IH 685 have?
The listed drawbar output is 52.9 hp, close to the 55 hp benchmark average. It gives a realistic pulling-power figure of about 52.9 hp.
How much engine power reaches the PTO on the Case IH 685?
The PTO-to-engine transfer works out to 93%, from 68.1 engine hp to 63.3 PTO hp. That is a strong transfer figure when the two specs are from the same configuration.
How efficient is the Case IH 685 for pulling work?
The drawbar-to-engine transfer is about 77.7%, from 68.1 engine hp to 52.9 drawbar hp. That gives a more grounded pulling estimate than engine horsepower alone.
Is the Case IH 685 better judged by PTO hp or drawbar hp?
The drawbar output is about 83.6% of PTO output, comparing 52.9 drawbar hp with 63.3 PTO hp. That helps separate pulling ability from PTO implement ability.
How big is the Case IH 685 engine?
The engine displacement is 238.8 ci, close to the 260 ci benchmark average. It is close to the normal engine-size range for this horsepower class.
Is the Case IH 685 engine stressed for its PTO horsepower?
The engine has about 3.8 cubic inches per PTO hp, using 238.8 ci and 63.3 PTO hp. That is close to the normal benchmark for this category.
How much PTO horsepower per liter does the Case IH 685 make?
The output density is about 16.2 PTO hp per liter, using 63.3 PTO hp and 3.9 L of displacement. Higher hp/L means more output squeezed from each liter; lower hp/L usually means a more relaxed engine tune.
Horsepower and engine specs can vary by year, market, engine option, fuel system, test standard and tractor configuration. Check the operator manual, spec plate, parts book and official caseih.com website before buying parts, sizing implements or making repair decisions.
