The Kubota STW40 tractor engine horsepower found is 38.5 hp. PTO horsepower found is 27.4 hp.
Engine HP38.5 hp
PTO HP27.4 hp
Power / weight14 hp per 1,000 lb
Kubota STW40 Horsepower Specs
Engine horsepower
38.5 hp
PTO horsepower
27.4 hp
Rated engine RPM
2,700 rpm
Engine torque
89.9 lb-ft (122 Nm)
Engine displacement
109.8 cu in (1.8 L)
Engine cylinders
3 cylinders
Engine
Kubota 1.8L
Operating weight
2,756 lb (1,250 kg)
PTO-to-engine ratio
71.2% of engine horsepower
Power-to-weight
14 hp per 1,000 lb
Horsepower class
mid-size compact tractor horsepower
Horsepower Benchmarks
Engine horsepower benchmark
This model
38.5 hp
Average
32 hp
Low
16 hp
High
60 hp
PTO horsepower benchmark
This model
27.4 hp
Average
25 hp
Low
12 hp
High
50 hp
Operating weight benchmark
This model
2,756 lb
Average
2,500 lb
Low
1,300 lb
High
4,500 lb
Power-to-weight benchmark
This model
14 hp/1k lb
Average
14 hp/1k lb
Low
8 hp/1k lb
High
25 hp/1k lb
Benchmarks are general reference ranges for compact tractors.
Kubota STW40 Horsepower FAQ
Engine horsepower
The Kubota STW40 tractor engine horsepower found is 38.5 hp. Use engine horsepower for comparing engine output, not necessarily implement power at the PTO.
PTO horsepower
The PTO horsepower found for the Kubota STW40 is 27.4 hp. PTO horsepower is the more useful figure when sizing PTO-driven implements.
Horsepower class
The Kubota STW40 is listed as mid-size compact tractor horsepower based on the engine horsepower found.
Rated engine RPM
The rated engine speed found for the Kubota STW40 is 2,700 rpm. This is the engine speed used for the listed power rating.
Engine torque
The engine torque found for the Kubota STW40 is 89.9 lb-ft (122 Nm). Torque helps describe low-speed pulling feel, while horsepower describes power output over engine speed.
Engine specs found
Engine specs found for the Kubota STW40 include Kubota 1.8L, 109.8 cu in (1.8 L) displacement, and 3 cylinders.
Operating weight
The operating weight found for the Kubota STW40 is 2,756 lb (1,250 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 STW40 is 71.2% of engine horsepower based on the figures found.
Power-to-weight
The calculated power-to-weight figure for the Kubota STW40 is 14 hp per 1,000 lb based on the engine horsepower and operating weight found.
Horsepower planning note
The practical split on the Kubota STW40 is engine power at 38.5 hp and PTO power at 27.4 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.
