M-R-S A-80
The M-R-S A-80 is a tractor produced by M R S. It is equipped with a 283.7 ci 4.6 L engine. The listed engine power is Diesel (listed): 134 hp / 99.9 kW. Transmission: 10 forward and 2 reverse. Drive type: 4x4 4WD. Operating weight: 15800 lbs 7166 kg.
Engine Power
Diesel (listed): 134 hp / 99.9 kW
Drive & Traction
4x4 4WD
Fuel & Capacities
Diesel
Transmission
10 forward and 2 reverse
Operating Weight
15800 lbs
7166 kg
Overview
 | 1964 - 1967
Four-wheel Drive (4WD) tractor |
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Production | |
|---|---|
Manufacturer | M-R-S |
Four-wheel Drive (4WD) tractor | |
Built in Flora, Mississippi, USA | |
M-R-S A-80 Engine | |
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Detroit Diesel 4.6L 4-cyl diesel | |
Engine details ...  |
M-R-S A-80 Transmission | |
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10-speed | |
Transmission details ...  |
M-R-S A-80 Power | |
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Engine | 134 hp
99.9 kW |
Drawbar (claimed) | 115 hp
85.8 kW |
Mechanical | |
|---|---|
Drive | 4x4 4WD |
Power four-wheel steering | |
Open operator station. | |
Dimensions & Tires | |
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Wheelbase | 100 inches
254 cm |
Weight | 15800 lbs
7166 kg |
Front tire | 16.9x30 |
Rear tire | 16.9x30 |
Full dimensions and tires ...  | |
Engine
Engine Detail — 283.7 ci / 4.6 L Diesel
Manufacturer | Detroit Diesel 4-71 |
Fuel Type | Diesel |
Configuration | 4-cylinder, liquid-cooled |
Displacement | 283.7 ci
4.6 L |
Bore/Stroke | 4.25x5.00 inches
108 x 127 mm |
Power | 134 hp
99.9 kW |
Rated RPM | 2000 |
Starter type | electric |
Transmission
Transmission — 10 forward and 2 reverse
Gears | 10 forward and 2 reverse |
Dimensions
M-R-S A-80 Tires | |
|---|---|
Ag front | 16.9x30 |
Ag rear | 16.9x30 |
Dimensions | |
|---|---|
Wheelbase | 100 inches
254 cm |
Length | 195 inches
495 cm |
Width | 111 inches
281 cm |
Height (cab) | 132 inches
335 cm |
Weight | 15800 lbs
7166 kg |
Ground clearance | 14 inches
35 cm |
Front tread | 80 inches
203 cm |
Rear tread | 80 inches
203 cm |
Photos
M-R-S A-80
Recommended Implements & Sizing Guide
Engineering recommendations for M R S M-R-S A-80 based on its 134 HP power envelope and ASAE agricultural standards.
| Implement & Operation | Recommended Size | Workload Rating | Engineering Notes |
|---|---|---|---|
Moldboard PlowPrimary Tillage | 4 to 5 Bottom (16-18")4 - 5 铧 (40-45 cm) | Heavy Duty | Heavy primary tillage; semi-mounted hitch recommended. |
Rotary Cutter / MowerMowing & Clearing | 10 to 12 ft Flex-Wing3.0 - 3.6 m 折叠双翼 | Heavy Duty | Wide swath pasture and crop residue shredding. |
Rotary TillerSeedbed Prep | 90 to 120 in Heavy Duty230 - 300 cm 重型旋耕机 | Commercial / Field Scale | Deep intensive seedbed preparation for commercial row crops. |
Disc HarrowSecondary Tillage | 15 to 22 ft Folding Disc4.5 - 6.7 m 折叠式圆盘耙 | Commercial / Field Scale | Wide commercial field leveling; requires hydraulic remotes. |
Hay BalerHay & Forage | 5x6 Round Baler or 3x3 Mid Square1.5x1.8 m 大圆捆或中型方捆机 | Heavy Duty | High density baling; requires minimum 85 PTO HP. |
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 M R S M-R-S A-80.
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
M R S M-R-S A-80 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for M R S M-R-S A-80.
Converted Equivalents:
Horsepower (HP)134 hp
Kilowatts (kW)99.9 kW
Metric Horsepower (PS / CV)135.9 PS
Direct Competitor Comparison
Compare M-R-S A-80 against same-era industry alternatives in the same horsepower class.
Current Model
M R S
M-R-S A-80
Engine Power:Diesel (listed): 134 hp / 99.9 kW
★ Baseline Reference
International HarvesterMarket Competitor
International Harvester 886B
Engine Power:121
Production Years:1981 - 1982
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