M-R-S A-80B
The M-R-S A-80B 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): 141 hp / 105.1 kW. Transmission: 20 forward and 4 reverse. Drive type: 4x4 4WD. Operating weight: 17000 lbs 7711 kg.
Engine Power
Diesel (listed): 141 hp / 105.1 kW
Drive & Traction
4x4 4WD
Fuel & Capacities
Diesel
Transmission
20 forward and 4 reverse
Operating Weight
17000 lbs
7711 kg
Overview
 | 1967 - 1980
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-80B Engine | |
|---|---|
Detroit Diesel 4.6L 4-cyl diesel | |
Engine details ...  |
M-R-S A-80B Transmission | |
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20-speed | |
Transmission details ...  |
M-R-S A-80B Power | |
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Engine | 141 hp
105.1 kW |
Drawbar (claimed) | 123 hp
91.7 kW |
Mechanical | |
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Drive | 4x4 4WD |
Power four-wheel steering | |
Open operator station. Cab optional with available air-conditioning.. | |
Hydraulics | |
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Pump flow | 20 gpm
75.7 lpm |
Dimensions & Tires | |
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Wheelbase | 118 inches
299 cm |
Front tire | 18.4-26 |
Rear tire | 18.4-26 |
Full dimensions and tires ...  | |
References | |
|---|---|
 | |
Red Book 1969 published by Implement & Tractor |
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 | 141 hp
105.1 kW |
Rated RPM | 2100 |
Torque | 366 lb-ft
496.3 Nm |
Torque RPM | 1600 |
Starter type | electric |
Oil capacity | 15 qts
14.2 L |
Coolant capacity | 42 qts
39.7 L |
Transmission
Transmission — 20 forward and 4 reverse
Gears | 20 forward and 4 reverse |
Clutch | 381mm dry disc |
 | |
Dimensions
M-R-S A-80B Tires | |
|---|---|
Ag front | 18.4-26 |
Ag rear | 18.4-26 |
Ag front | 18.00-26 |
23.1-26 | |
Ag rear | 18.00-26 |
23.1-26 | |
Dimensions | |
|---|---|
Wheelbase | 118 inches
299 cm |
Length | 195 inches
495 cm |
Width | 111 inches
281 cm |
Height | 117 inches
297 cm |
Max weight | 17000 lbs
7711 kg |
Ground clearance | 14 inches
35 cm |
Front tread | 80 inches
203 cm |
Rear tread | 80 inches
203 cm |
Photos
M-R-S A-80B tractor photo
Recommended Implements & Sizing Guide
Engineering recommendations for M R S M-R-S A-80B based on its 141 HP power envelope and ASAE agricultural standards.
| Implement & Operation | Recommended Size | Workload Rating | Engineering Notes |
|---|---|---|---|
Moldboard PlowPrimary Tillage | 5 to 7 Bottom (18")5 - 7 铧 (45 cm) | Commercial / Field Scale | Large acreage tillage; requires front ballast weights. |
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-80B.
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-80B Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for M R S M-R-S A-80B.
Converted Equivalents:
Horsepower (HP)141 hp
Kilowatts (kW)105.1 kW
Metric Horsepower (PS / CV)143 PS
Direct Competitor Comparison
Compare M-R-S A-80B against same-era industry alternatives in the same horsepower class.
Current Model
M R S
M-R-S A-80B
Engine Power:Diesel (listed): 141 hp / 105.1 kW
★ Baseline Reference
International HarvesterMarket Competitor
International Harvester 1026
Engine Power:127
Production Years:1970 - 1971
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