M-R-S A-85
The M-R-S A-85 is a tractor produced by M R S. It is equipped with a 318.4 ci 5.2 L engine. The listed engine power is Diesel (listed): 202 hp / 150.6 kW. Transmission: 20 forward and 4 reverse. Drive type: 4x4 4WD. Operating weight: 17300 lbs 7847 kg.
Engine Power
Diesel (listed): 202 hp / 150.6 kW
Drive & Traction
4x4 4WD
Fuel & Capacities
Diesel
Transmission
20 forward and 4 reverse
Operating Weight
17300 lbs
7847 kg
Overview
 | 1977 - 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-85 Engine | |
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Detroit Diesel 5.2L 6-cyl diesel | |
Engine details ...  |
M-R-S A-85 Transmission | |
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20-speed | |
Transmission details ...  |
M-R-S A-85 Power | |
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Engine | 202 hp
150.6 kW |
Drawbar (claimed) | 164 hp
122.3 kW |
Mechanical | |
|---|---|
Drive | 4x4 4WD |
Power four-wheel steering | |
Hydraulics | |
|---|---|
Pump flow | 20 gpm
75.7 lpm |
Dimensions & Tires | |
|---|---|
Wheelbase | 118 inches
299 cm |
Weight | 17300 lbs
7847 kg |
Front tire | 23.1x26 |
Rear tire | 23.1x26 |
Full dimensions and tires ...  | |
Engine
Engine Detail — 318.4 ci / 5.2 L Diesel
Manufacturer | Detroit Diesel 6V-53N |
Fuel Type | Diesel |
Configuration | 6-cylinder, liquid-cooled |
Displacement | 318.4 ci
5.2 L |
Bore/Stroke | 3.875x4.50 inches
98 x 114 mm |
Power | 202 hp
150.6 kW |
Rated RPM | 2500 |
Starter type | electric |
Transmission
Transmission — 20 forward and 4 reverse
Gears | 20 forward and 4 reverse |
Dimensions
M-R-S A-85 Tires | |
|---|---|
Ag front | 23.1x26 |
Ag rear | 23.1x26 |
Dimensions | |
|---|---|
Wheelbase | 118 inches
299 cm |
Length | 195 inches
495 cm |
Width | 111 inches
281 cm |
Height (cab) | 132 inches
335 cm |
Weight | 17300 lbs
7847 kg |
Ground clearance | 14 inches
35 cm |
Front tread | 80 inches
203 cm |
Rear tread | 80 inches
203 cm |
Photos
M-R-S A-85 tractor photo
Recommended Implements & Sizing Guide
Engineering recommendations for M R S M-R-S A-85 based on its 202 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 | 15 to 20 ft Batwing4.6 - 6.1 m 宽幅折叠翼 | Commercial / Field Scale | Large commercial field and roadside mowing operations. |
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 | Large Square Baler (3x4 or 4x4)大方捆商用打捆机 (1.2x1.2 m) | Commercial / Field Scale | High-capacity commercial forage harvesting (1000 RPM PTO). |
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-85.
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-85 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for M R S M-R-S A-85.
Converted Equivalents:
Horsepower (HP)202 hp
Kilowatts (kW)150.6 kW
Metric Horsepower (PS / CV)204.8 PS
Direct Competitor Comparison
Compare M-R-S A-85 against same-era industry alternatives in the same horsepower class.
Current Model
M R S
M-R-S A-85
Engine Power:Diesel (listed): 202 hp / 150.6 kW
★ Baseline Reference
International HarvesterMarket Competitor
International Harvester 1566
Engine Power:183
Production Years:1974 - 1976
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