Renault 781S
The Renault 781S is a tractor produced by Renault. It is equipped with a 253.5 ci 4.2 L engine. The listed engine power is Diesel (listed): 78 hp / 58.2 kW. Transmission: 12 forward and reverse. Drive type: 4x2 2WD. Operating weight: 7,056 lbs (2WD) 3200 kg.
Engine Power
Diesel (listed): 78 hp / 58.2 kW
Drive & Traction
4x2 2WD
Fuel & Capacities
20.3 gal
76.8 L
Transmission
12 forward and reverse
Operating Weight
7,056 lbs (2WD)
3200 kg
Overview
 | 1980 - 1985 |
|---|
Production | |
|---|---|
Manufacturer | Renault |
Renault 781S Engine | |
|---|---|
MWM 4.2L 4-cyl diesel | |
Fuel tank | 20.3 gal
76.8 L |
Engine details ...  | |
Renault 781S Transmission | |
|---|---|
12-speed | |
Transmission details ...  |
Renault 781S Power | |
|---|---|
Engine | 78 hp
58.2 kW |
Mechanical | |
|---|---|
Drive | 4x2 2WD |
4x4 MFWD 4WD optional | |
Steering | hydrostatic power |
Dry disc brakes | |
standard | |
Hydraulics | |
|---|---|
Total flow | 8.7 gpm
32.9 lpm |
Tractor hitch | |
|---|---|
Rear lift | 9,923 lbs
4501 kg |
Power Take-off (PTO) | |
|---|---|
Rear PTO Type | 540/1000 |
Dimensions & Tires | |
|---|---|
Wheelbase | 95.3 inches
242 cm |
Weight | 7056 to 8743 pounds |
Front tire | 7.50-18 |
Rear tire | 16.9-34 |
Full dimensions and tires ...  | |
Engine
Engine Detail — 253.5 ci / 4.2 L Diesel
Manufacturer | MWM D226-4 |
Fuel Type | Diesel |
Configuration | 4-cylinder |
Displacement | 253.5 ci
4.2 L |
Bore/Stroke | 4.134x4.724 inches
105 x 120 mm |
Power | 78 hp
58.2 kW |
Rated RPM | 2350 |
Torque | 199.2 lb-ft
270.1 Nm |
Torque RPM | 1500 |
Transmission
Transmission — 12 forward and reverse
Gears | 12 forward and reverse |
Dimensions
Renault 781S Tires | |
|---|---|
Ag front | 7.50-18 |
Ag rear | 16.9-34 |
Ag front | 13.6-24 |
Ag rear | 16.9-34 |
Dimensions | |
|---|---|
Wheelbase | 95.3 inches
242 cm |
Length | 162.2 inches
411 cm |
Height | 103.9 inches
263 cm |
Weight | 7,056 lbs (2WD)
3200 kg |
8,743 lbs (4WD)
3965 kg | |
Photos
Renault 781S tractor photo
Recommended Implements & Sizing Guide
Engineering recommendations for Renault 781S based on its 78 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 | 10 to 14 ft Tandem / Offset3.0 - 4.2 m 重型交错耙 | Heavy Duty | Aggressive residue cutting in corn/cotton stubble. |
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 Renault 781S.
Estimated Continuous Field Runtime: 5 hrs
Approximately 5 hours of continuous field operation at ~75% rated power on a full tank (20.3 gal / 76.8 L).
Estimated 75% Load Fuel Burn~4.1 gal/hr (15.4 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
Renault 781S Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Renault 781S.
Converted Equivalents:
Horsepower (HP)78 hp
Kilowatts (kW)58.2 kW
Metric Horsepower (PS / CV)79.1 PS
Direct Competitor Comparison
Compare Renault 781S against same-era industry alternatives in the same horsepower class.
Current Model
Renault
Renault 781S
Engine Power:Diesel (listed): 78 hp / 58.2 kW
★ Baseline Reference
International HarvesterMarket Competitor
International Harvester 656
Engine Power:70.9
Production Years:1965 - 1973
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