The Kubota F3990 tractor engine horsepower found is 39 hp. PTO horsepower found is 36.9 hp.
Engine HP39 hp
PTO HP36.9 hp
Power / weight22.7 hp per 1,000 lb
Kubota F3990 Horsepower Specs
Engine horsepower
39 hp
PTO horsepower
36.9 hp
Rated engine RPM
2,500 rpm
Engine displacement
91.4 cu in (1.5 L)
Engine cylinders
4 cylinders
Engine model
Kubota V1505
Operating weight
1,716 lb (778 kg)
PTO-to-engine ratio
94.6% of engine horsepower
Power-to-weight
22.7 hp per 1,000 lb
Horsepower class
high-power mower / garden tractor
Horsepower Benchmarks
Engine horsepower benchmark
This model
39 hp
Average
23 hp
Low
12 hp
High
40 hp
PTO horsepower benchmark
This model
36.9 hp
Average
18 hp
Low
8 hp
High
35 hp
Operating weight benchmark
This model
1,716 lb
Average
1,200 lb
Low
500 lb
High
2,600 lb
Power-to-weight benchmark
This model
22.7 hp/1k lb
Average
20 hp/1k lb
Low
12 hp/1k lb
High
35 hp/1k lb
Benchmarks are general reference ranges for lawn and garden tractors and mowers.
Kubota F3990 Horsepower FAQ
Engine horsepower
The Kubota F3990 tractor engine horsepower found is 39 hp. Use engine horsepower for comparing engine output, not necessarily implement power at the PTO.
PTO horsepower
The PTO horsepower found for the Kubota F3990 is 36.9 hp. PTO horsepower is the more useful figure when sizing PTO-driven implements.
Horsepower class
The Kubota F3990 is listed as high-power mower / garden tractor based on the engine horsepower found.
Rated engine RPM
The rated engine speed found for the Kubota F3990 is 2,500 rpm. This is the engine speed used for the listed power rating.
Engine specs found
Engine specs found for the Kubota F3990 include Kubota V1505, 91.4 cu in (1.5 L) displacement, and 4 cylinders.
Operating weight
The operating weight found for the Kubota F3990 is 1,716 lb (778 kg). Weight matters because the same horsepower feels different in a light mower than in a heavy tractor.
PTO-to-engine horsepower ratio
The PTO-to-engine horsepower ratio for the Kubota F3990 is 94.6% of engine horsepower based on the figures found.
Power-to-weight
The calculated power-to-weight figure for the Kubota F3990 is 22.7 hp per 1,000 lb based on the engine horsepower and operating weight found.
Horsepower planning note
The practical split on the Kubota F3990 is engine power at 39 hp and PTO power at 36.9 hp.
Official information note
Mistakes do happen. Check the operator manual, service manual and official kubotausa.com website for official horsepower, PTO horsepower, engine RPM, torque and operating-weight specifications before buying implements or servicing the machine.
