M-R-S A-90
The M-R-S A-90 is a tractor produced by M R S. It is equipped with a 401 ci 6.6 L engine. The listed engine power is Diesel (listed): 123 hp / 91.7 kW. Transmission: 10 forward and 2 reverse. Drive type: 4x4 4WD. Operating weight: 24000 lbs 10886 kg.
Engine Power
Diesel (listed): 123 hp / 91.7 kW
Drive & Traction
4x4 4WD
Fuel & Capacities
Diesel
Transmission
10 forward and 2 reverse
Operating Weight
24000 lbs
10886 kg
Overview
 | 1962 - 1963
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-90 Engine | |
|---|---|
Cummins 6.6L 6-cyl diesel | |
Engine details ...  |
M-R-S A-90 Transmission | |
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10-speed | |
Transmission details ...  |
M-R-S A-90 Power | |
|---|---|
Engine | 123 hp
91.7 kW |
Drawbar (claimed) | 90 hp
67.1 kW |
Mechanical | |
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Drive | 4x4 4WD |
Power four-wheel steering | |
Open operator station. | |
Dimensions & Tires | |
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Wheelbase | 100 inches
254 cm |
Weight | 24000 lbs
10886 kg |
Front tire | 18.4x26 |
Rear tire | 18.4x26 |
Full dimensions and tires ...  | |
Engine
Engine Detail — 401 ci / 6.6 L Diesel
Manufacturer | Cummins JN-130-CI |
Fuel Type | Diesel |
Configuration | 6-cylinder, liquid-cooled |
Displacement | 401 ci
6.6 L |
Bore/Stroke | 4.125x5.00 inches
105 x 127 mm |
Power | 123 hp
91.7 kW |
Rated RPM | 2200 |
Starter type | electric |
Transmission
Transmission — 10 forward and 2 reverse
Gears | 10 forward and 2 reverse |
 | |
Dimensions
M-R-S A-90 Tires | |
|---|---|
Ag front | 18.4x26 |
Ag rear | 18.4x26 |
Dimensions | |
|---|---|
Wheelbase | 100 inches
254 cm |
Height | 114 inches
289 cm |
Weight | 24000 lbs
10886 kg |
Ground clearance | 16 inches
40 cm |
Front tread | 75 inches
190 cm |
Rear tread | 75 inches
190 cm |
Recommended Implements & Sizing Guide
Engineering recommendations for M R S M-R-S A-90 based on its 123 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-90.
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-90 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for M R S M-R-S A-90.
Converted Equivalents:
Horsepower (HP)123 hp
Kilowatts (kW)91.7 kW
Metric Horsepower (PS / CV)124.7 PS
Direct Competitor Comparison
Compare M-R-S A-90 against same-era industry alternatives in the same horsepower class.
Current Model
M R S
M-R-S A-90
Engine Power:Diesel (listed): 123 hp / 91.7 kW
★ Baseline Reference
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