Hefty F
The Hefty F is a tractor produced by Hefty. It is equipped with a 51.6 ci 0.8 L engine. The listed engine power is Gasoline (listed): 27 hp / 20.1 kW. Transmission: 6 forward and 1 reverse. Operating weight: 2200 lbs 997 kg.
Engine Power
Gasoline (listed): 27 hp / 20.1 kW
Fuel & Capacities
5 gal
18.9 L
Transmission
6 forward and 1 reverse
Operating Weight
2200 lbs
997 kg
Overview
 | 1974 - 1978
Utility tractor |
|---|
Production | |
|---|---|
Manufacturer | Hefty |
Utility tractor | |
Built in Juneau, Wisconsin, USA | |
Hefty F Engine | |
|---|---|
Continental 0.8L 4-cyl gasoline | |
Fuel tank | 5 gal
18.9 L |
Engine details ...  | |
Hefty F Transmission | |
|---|---|
6-speed gear | |
Transmission details ...  |
Hefty F Power | |
|---|---|
Engine | 27 hp
20.1 kW |
PTO (claimed) | 24 hp
17.9 kW |
Mechanical | |
|---|---|
Two-wheel drive | |
Final drives | spur gear |
Manual steering | |
Mechanical disc brakes | |
Open operator station. | |
Hydraulics | |
|---|---|
Type | open center |
Pressure | 2000 psi
137.9 bar |
Pump flow | 3.2 gpm
12.1 lpm |
Tractor hitch | |
|---|---|
Rear Type | I |
Control | position control |
Rear lift (at ends) | 1570 lbs
712 kg |
Rear lift (at 24"/610mm) | 1210 lbs
548 kg |
Power Take-off (PTO) | |
|---|---|
Rear PTO | independent |
Rear PTO Type | 540 (1.375) |
Dimensions & Tires | |
|---|---|
Wheelbase | 72 inches
182 cm |
Weight | 2200 lbs
997 kg |
Front tire | 5.00-15 |
Rear tire | 11.2-24 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Ground | negative |
Battery volts | 12 |
References | |
|---|---|
 | |
F - Implements published by Hefty | |
FN published by Hefty |
Engine
Engine Detail — 51.6 ci / 0.8 L Gasoline
Manufacturer | Continental R800-46 |
Fuel Type | Gasoline |
Configuration | 4-cylinder, liquid-cooled inline |
The Continental R800 engine was built by Renault. | |
Displacement | 51.6 ci
0.8 L |
Bore/Stroke | 2.28x3.14 inches
58 x 80 mm |
Power | 27 hp
20.1 kW |
Compression | 8:1 |
Rated RPM | 3300 |
Firing order | 1-3-4-2 |
Starter | electric |
Starter volts | 12 |
Coolant capacity | 5 qts
4.7 L |
Transmission
Transmission — 6 forward and 1 reverse gear
Type | gear |
Gears | 6 forward and 1 reverse |
Clutch | mechanical dry disc |
Two speeds, plus reverse, in three ranges. | |
 | |
Dimensions
Hefty F Tires | |
|---|---|
Ag front | 5.00-15 |
Ag rear | 11.2-24 |
Ag front | 6.00-12 |
Dimensions | |
|---|---|
Wheelbase | 72 inches
182 cm |
Height | 64 inches
162 cm |
Shipping weight | 2200 lbs
997 kg |
Front tread | 40 to 60 inches
101 to 152 cm |
Rear tread | 36 to 62 inches
91 to 157 cm |
Photos
Hefty F tractor photo
Recommended Implements & Sizing Guide
Engineering recommendations for Hefty F based on its 27 HP power envelope and ASAE agricultural standards.
| Implement & Operation | Recommended Size | Workload Rating | Engineering Notes |
|---|---|---|---|
Moldboard PlowPrimary Tillage | 1 to 2 Bottom (12")1 - 2 铧 (30 cm) | Light Duty | Ideal for garden plots and light sandy soil. |
Rotary Cutter / MowerMowing & Clearing | 5 ft (60 in)1.5 m | Medium Duty | Pasture maintenance and weeds up to 1.5" diameter. |
Rotary TillerSeedbed Prep | 54 to 60 in135 - 150 cm | Medium Duty | Thorough seedbed preparation in orchards and vegetable plots. |
Disc HarrowSecondary Tillage | 5 to 6 ft (16-18" discs)1.5 - 1.8 m (40-45 cm 耙片) | Light Duty | Small acreage soil break-up and secondary aeration. |
Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.
Fluids, Capacities & Working Autonomy
Standard fluid requirements, service intervals, and continuous runtime estimates for Hefty F.
Estimated Continuous Field Runtime: 3.6 hrs
Approximately 3.6 hours of continuous field operation at ~75% rated power on a full tank (5 gal / 18.9 L).
Estimated 75% Load Fuel Burn~1.4 gal/hr (5.3 L/hr)
Engine Crankcase Oil
SAE 15W-40 (Heavy Duty Diesel)
Standard Spec: API CK-4 / CJ-4 Heavy Duty
Service Interval: 150 – 250 Hours
Transmission & Hydraulic System
UTTO (Universal Tractor Transmission Oil)
Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)
Service Interval: 600 – 1000 Hours
Engine Cooling System
50/50 Ethylene Glycol Pre-mix
Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze
Service Interval: 2 Years / 1500 Hours
Hefty F Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Hefty F.
Converted Equivalents:
Horsepower (HP)27 hp
Kilowatts (kW)20.1 kW
Metric Horsepower (PS / CV)27.4 PS
Direct Competitor Comparison
Compare Hefty F against same-era industry alternatives in the same horsepower class.
Current Model
Hefty
Hefty F
Engine Power:Gasoline (listed): 27 hp / 20.1 kW
★ Baseline Reference
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