Muir-Hill 121
The Muir-Hill 121 is a tractor produced by Muir Hill. It is equipped with a 380 ci 6.2 L engine. The listed engine power is Diesel (listed): 120 hp / 89.5 kW. Transmission: 8 forward and 2 reverse. Drive type: 4x4 4WD. Operating weight: 10700 lbs 4853 kg.
Engine Power
Diesel (listed): 120 hp / 89.5 kW
Drive & Traction
4x4 4WD
Fuel & Capacities
48 gal
181.7 L
Transmission
8 forward and 2 reverse
Operating Weight
10700 lbs
4853 kg
Overview
 | 1972 - 1983
Four-wheel Drive (4WD) tractor |
|---|
Production | |
|---|---|
Manufacturer | Muir-Hill |
Four-wheel Drive (4WD) tractor | |
Built in Manchester, England | |
Muir-Hill 121 Engine | |
|---|---|
Ford 6.2L 6-cyl diesel | |
Fuel tank | 48 gal
181.7 L |
Engine details ...  | |
Muir-Hill 121 Transmission | |
|---|---|
8-speed gear | |
Transmission details ...  |
Muir-Hill 121 Power | |
|---|---|
Engine | 120 hp
89.5 kW |
PTO (claimed) | 70 hp
52.2 kW |
Mechanical | |
|---|---|
Drive | 4x4 4WD |
Final drives | planetary |
Steering | power |
Hydraulic wet disc brakes | |
Cab standard. | |
Hydraulics | |
|---|---|
Type | open center |
Pressure | 2600 psi
179.3 bar |
Pump flow | 11 gpm
41.6 lpm |
Tractor hitch | |
|---|---|
Rear Type | II |
Control | position and draft control |
Power Take-off (PTO) | |
|---|---|
Rear PTO | independent |
Clutch | hydraulic wet disc |
Rear PTO Type | 540 (1.375) |
1000 (1.375) | |
Engine RPM | 540@1750 |
Dimensions & Tires | |
|---|---|
Wheelbase | 75 inches
190 cm |
Weight | 10700 lbs
4853 kg |
Front tire | 13.6/12x38 |
Rear tire | 13.6/12x38 |
Full dimensions and tires ...  | |
Electrical | |
|---|---|
Charging system | alternator |
Battery volts | 12 |
Battery AH | 128 |
References | |
|---|---|
 | |
121 published in 1973, by Muir-Hill | |
121 published in 1980, by Muir-Hill |
Engine
Engine Detail — 380 ci / 6.2 L Diesel
Manufacturer | Ford 2715E |
Fuel Type | Diesel |
Configuration | 6-cylinder, liquid-cooled |
Displacement | 380 ci
6.2 L |
Bore/Stroke | 4.22x4.524 inches
107 x 115 mm |
Power | 120 hp
89.5 kW |
Fuel system | direct injection |
Compression | 16:1 |
Rated RPM | 2500 |
Torque | 280 lb-ft
379.7 Nm |
Torque RPM | 1600 |
Starter | electric |
Starter volts | 12 |
Transmission
Transmission — 8 forward and 2 reverse gear
Type | gear |
Gears | 8 forward and 2 reverse |
Clutch | 355.6mm dry disc |
 | |
Dimensions
Muir-Hill 121 Tires | |
|---|---|
Ag front | 13.6/12x38 |
Ag rear | 13.6/12x38 |
Dimensions | |
|---|---|
Wheelbase | 75 inches
190 cm |
Length | 156 inches
396 cm |
Width | 82 inches
208 cm |
Weight | 10700 lbs
4853 kg |
Front tread | 64 to 80 inches
162 to 203 cm |
Rear tread | 64 to 80 inches
162 to 203 cm |
Photos
Muir-Hill 121
Recommended Implements & Sizing Guide
Engineering recommendations for Muir Hill Muir-Hill 121 based on its 120 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 Muir Hill Muir-Hill 121.
Estimated Continuous Field Runtime: 7.7 hrs
Approximately 7.7 hours of continuous field operation at ~75% rated power on a full tank (48 gal / 181.7 L).
Estimated 75% Load Fuel Burn~6.2 gal/hr (23.6 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
Muir Hill Muir-Hill 121 Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Muir Hill Muir-Hill 121.
Converted Equivalents:
Horsepower (HP)120 hp
Kilowatts (kW)89.5 kW
Metric Horsepower (PS / CV)121.7 PS
Direct Competitor Comparison
Compare Muir-Hill 121 against same-era industry alternatives in the same horsepower class.
Current Model
Muir Hill
Muir-Hill 121
Engine Power:Diesel (listed): 120 hp / 89.5 kW
★ Baseline Reference
International HarvesterMarket Competitor
International Harvester 1046
Engine Power:108.5
Production Years:1971 - 1978
Related models
Muir-Hill 111
- Power:
- 110
- Production years:
- 1972 - 1983
Muir-Hill 101
- Power:
- 120
- Production years:
- 1968 - 1972
Muir-Hill 141
- Power:
- 145
- Production years:
- 1978 - 1983
Muir-Hill 171
- Power:
- 177
- Production years:
- 1975 - 1984
Muir-Hill 110
- Power:
- 84
- Production years:
- 1969 - 1972