The Case IH STX500QT Quadtrac tractor engine horsepower is 500 hp | 372.9 kW, and PTO horsepower is 440 hp | 328.1 kW.
Engine HP500 hp | 372.9 kW
PTO HP440 hp | 328.1 kW
PTO Transfer88%
Displacement915 ci | 15.0 L
Case IH STX500QT Quadtrac Horsepower Specs
Engine horsepower
500 hp | 372.9 kW
PTO horsepower claimed
440 hp | 328.1 kW
Case IH STX500QT Quadtrac Useful Horsepower Calculations
PTO-to-engine power transfer
88% of engine hp reaches the PTO
Engine size per PTO horsepower
2.1 ci per PTO hp
PTO horsepower per liter
29.3 PTO hp per L
Engine size per engine horsepower
1.8 ci per engine hp
Engine horsepower per liter
33.3 engine hp per L
Case IH STX500QT Quadtrac Engine Specs
Engine type
turbocharged diesel
Displacement
915 ci | 15.0 L
Bore and stroke
5.40×6.70 inches | 137 x 170 mm
Case IH STX500QT Quadtrac Fuel, Cooling, Starting & Service Specs
Starter volts
12
Battery volts
12
Case IH STX500QT Quadtrac Horsepower Comparison Charts
Engine horsepower comparison
This model
500 hp
Average
210 hp
Low
120 hp
High
380 hp
PTO horsepower comparison
This model
440 hp
Average
175 hp
Low
100 hp
High
320 hp
Displacement comparison
This model
915 ci
Average
520 ci
Low
360 ci
High
750 ci
Engine size per PTO HP
This model
2.1 ci/hp
Average
3.3 ci/hp
Low
2 ci/hp
High
5.2 ci/hp
Benchmarks use practical low, average and high ranges for the large ag tractor category. Use the operator manual and actual engine/tractor configuration before sizing implements or judging working power.
Case IH STX500QT Quadtrac Horsepower FAQ
How much horsepower does the Case IH STX500QT Quadtrac have?
The listed engine output is 500 hp, above the 210 hp benchmark average. That is a higher-power result, so ballast, tire setup and implement width matter if you want to use the full 500 hp.
How much PTO horsepower does the Case IH STX500QT Quadtrac have?
The listed PTO output is 440 hp, above the 175 hp benchmark average. That is the number to use for mowers, balers, augers, pumps and other PTO tools that need up to about 440 hp.
How much engine power reaches the PTO on the Case IH STX500QT Quadtrac?
The PTO-to-engine transfer works out to 88%, from 500 engine hp to 440 PTO hp. That is a normal usable range for judging PTO implement fit.
How big is the Case IH STX500QT Quadtrac engine?
The engine displacement is 915 ci, above the 520 ci benchmark average. Bigger displacement can help low-rpm pull and load-holding feel.
Is the Case IH STX500QT Quadtrac engine stressed for its PTO horsepower?
The engine has about 2.1 cubic inches per PTO hp, using 915 ci and 440 PTO hp. That is a smaller-displacement, higher-output style result.
How much PTO horsepower per liter does the Case IH STX500QT Quadtrac make?
The output density is about 29.3 PTO hp per liter, using 440 PTO hp and 15 L of displacement. Higher hp/L means more output squeezed from each liter; lower hp/L usually means a more relaxed engine tune.
Official information note
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.
