Hesston 70-66
The Hesston 70-66 is a tractor produced by Hesston. It is equipped with a 220.5 ci 3.6 L engine. The listed engine power is Diesel (listed): 70 hp / 52.2 kW. Transmission: 20 forward and 8 reverse. Operating weight: 5689 to 6510 pounds.
Engine Power
Diesel (listed): 70 hp / 52.2 kW
Fuel & Capacities
19.2 gal
72.7 L
Transmission
20 forward and 8 reverse
Operating Weight
5689 to 6510 pounds
Overview
 | 1985 - 1991
66 SeriesUtility tractorFiat built
66 Series
Utility tractor
Fiat built |
|---|
Production | |
|---|---|
Distributor | Hesston |
Manufacturer | Fiat |
Utility tractor | |
Original price was $23,400 in 1990 | |
Variants | |
|---|---|
70-66 | utility 2WD[6073] |
70-66DT | utility 4WD[6073] |
70-66ORDT | orchard 4WD |
70-66HC | high-crop |
70-66HCDT | high-crop 4WD |
Hesston 70-66 Engine | |
|---|---|
Fiat 3.6L 4-cyl diesel | |
Fuel tank | 19.2 gal
72.7 L |
Engine details ...  | |
Hesston 70-66 Power | |
|---|---|
Engine | 70 hp
52.2 kW |
Drawbar (claimed) | 54 hp
40.3 kW |
PTO (claimed) | 62.7 hp
46.8 kW |
Drawbar (tested) | 54.22 hp
40.4 kW |
PTO (tested) | 62.72 hp
46.8 kW |
Performance test details ...  | |
Mechanical | |
|---|---|
Two- or four-wheel drive | |
Power steering | |
Mechanical wet disc brakes | |
Four-post ROPS. Canopy optional. |
Hydraulics | |
|---|---|
Type | open center |
Valves | 1 to 3 |
Total flow | 11 gpm
41.6 lpm |
Tractor hitch | |
|---|---|
Rear Type | I/II |
Control | position and lower-link draft control |
Rear lift | 5194 lbs
2355 kg |
Power Take-off (PTO) | |
|---|---|
Rear PTO | independent |
Rear PTO Type | 540/ground |
Dimensions & Tires | |
|---|---|
2WD Wheelbase | 90.7 inches
230 cm |
4WD Wheelbase | 88.5 inches
224 cm |
Weight | 5689 to 6510 pounds |
Front tire | 7.50-16 |
2WD Rear tire | 14.9-30 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Charging system | alternator |
Charging amps | 33 |
Battery volts | 12 |
References | |
|---|---|
 | |
66 Series Tractors 45 to 70 PTO HP published in 1985, by Hesston | |
66 Series Tractors Models 55-66, 60-66, 70-66, 80-66 - 45 to 70 PTO HP published in 1985, by Hesston |
Engine
Engine Detail — 220.5 ci / 3.6 L Diesel
Manufacturer | Fiat 8045.06 |
Fuel Type | Diesel |
Configuration | 4-cylinder, liquid-cooled |
Displacement | 220.5 ci
3.6 L |
Bore/Stroke | 3.937x4.527 inches
100 x 115 mm |
Power | 70 hp
52.2 kW |
Compression | 17:1 |
Rated RPM | 2500 |
Starter | electric |
Starter volts | 12 |
Hesston 70-66 Engine | |
|---|---|
 |
Transmission
Transmission options | |
|---|---|
12-speed partially synchronized | |
12-speed mechanical shuttle | |
20-speed creeper |
Transmission — 12 forward and 4 reverse partially synchronized
Type | partially synchronized |
Gears | 12 forward and 4 reverse |
Four gears (1-4) in three ranges (I-III). Shifts between gears are synchronized. | |
With 16.9-30 rear tires. | |
 | |
Transmission — 12 forward and reverse mechanical shuttle
Type | mechanical shuttle |
Gears | 12 forward and reverse |
Four gears (1-4) in three ranges (I-III) with shuttle. | |
With 16.9-30 rear tires. | |
 | |
Transmission — 20 forward and 8 reverse creeper
Type | creeper |
Gears | 20 forward and 8 reverse |
Four gears (1-4) in three ranges (I-III) with normal and creeper ranges. | |
With 16.9-30 rear tires. | |
 | |
Dimensions
Hesston 70-66 Tires | |
|---|---|
2WD Standard tires (ag) | Front: 7.50-16. Rear: 14.9-30 |
4WD Standard tires (ag) | Front: 9.5-24. Rear: 14.9-30 |
Dimensions | |
|---|---|
2WD Wheelbase | 90.7 inches
230 cm |
4WD Wheelbase | 88.5 inches
224 cm |
2WD Length | 139 inches
353 cm |
4WD Length | 143 inches
363 cm |
2WD Clearance (front axle) | 20.5 inches
52 cm |
4WD Clearance (front axle) | 16.5 inches
41 cm |
2WD Front tread | 55.1 to 74.75 inches
139 to 189 cm |
4WD Front tread | 60.25 to 77 inches
153 to 195 cm |
Rear tread | 55.1 to 78.75 inches
139 to 200 cm |
Hesston 70-66 Weight | |
|---|---|
2WD Shipping | 5689 lbs
2580 kg |
4WD Shipping | 6350 lbs
2880 kg |
4WD Operating | 6510 lbs
2952 kg |
Ballasted | 8705 lbs
3948 kg |
Hesston 70-66 Height | |
|---|---|
Steering wheel | 65 inches
165 cm |
Hood | 59 inches
149 cm |
ROPS | 97.5 inches
247 cm |
Tests
Nebraska Tractor Test 1561 | |
|---|---|
Diesel 12-speed 4WD
April 17 - May 1, 1985 | |
PTO performance | |
Power at rated engine speed | 62.72 hp
46.8 kW |
Fuel use | 3.7 gal/hour
14.0 l/hour |
Power at rated PTO speed | 62.71 hp
46.8 kW |
Fuel use | 3.6 gal/hour
13.6 l/hour |
Drawbar performance | |
Max power | 54.22 hp
40.4 kW |
Fuel use | 3.7 gal/hour
14.0 l/hour |
Recommended Implements & Sizing Guide
Engineering recommendations for Hesston 70-66 based on its 70 HP power envelope and ASAE agricultural standards.
| Implement & Operation | Recommended Size | Workload Rating | Engineering Notes |
|---|---|---|---|
Moldboard PlowPrimary Tillage | 3 to 4 Bottom (16")3 - 4 铧 (40 cm) | Heavy Duty | Suitable for medium loam and stubble turnover. |
Rotary Cutter / MowerMowing & Clearing | 7 to 8 ft (84-96 in)2.1 - 2.4 m | Heavy Duty | Heavy-duty twin spindle cutter for overgrown acreage. |
Rotary TillerSeedbed Prep | 78 to 84 in200 - 215 cm | Heavy Duty | Heavy commercial tiller with multi-speed gearbox. |
Disc HarrowSecondary Tillage | 7 to 8 ft Tandem Disc2.1 - 2.4 m 对开双排耙 | Medium Duty | Field leveling and clod breaking behind plows. |
Hay BalerHay & Forage | 4x4 to 4x5 Round Baler1.2x1.5 m 紧凑圆捆机 | Heavy Duty | Silage and dry hay; 540 RPM PTO with slip-clutch. |
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 Hesston 70-66.
Estimated Continuous Field Runtime: 5.3 hrs
Approximately 5.3 hours of continuous field operation at ~75% rated power on a full tank (19.2 gal / 72.7 L).
Estimated 75% Load Fuel Burn~3.6 gal/hr (13.8 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
Hesston 70-66 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Hesston 70-66.
Converted Equivalents:
Horsepower (HP)70 hp
Kilowatts (kW)52.2 kW
Metric Horsepower (PS / CV)71 PS
Direct Competitor Comparison
Compare Hesston 70-66 against same-era industry alternatives in the same horsepower class.
Current Model
Hesston
Hesston 70-66
Engine Power:Diesel (listed): 70 hp / 52.2 kW
★ Baseline Reference
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