Gibson I
The Gibson I is a tractor produced by Gibson. It is equipped with a 236.7 ci 3.9 L engine. The listed engine power is 36.82 hp 27.5 kW. Transmission: 4 forward and 1 reverse. Operating weight: 4000 to 4512 pounds.
Engine Power
36.82 hp
27.5 kW
Fuel & Capacities
20 gal
75.7 L
Transmission
4 forward and 1 reverse
Operating Weight
4000 to 4512 pounds
Overview
 | 1948 - 1952
Row-Crop tractor |
|---|
Production | |
|---|---|
Manufacturer | Gibson |
Row-Crop tractor | |
Built in Longmont, Colorado, USA | |
Variants | |
|---|---|
I | tricycle-front |
IFA | adjustable wide-front |
IFS | standard front |
Gibson I Engine | |
|---|---|
Hercules 3.9L 6-cyl gasoline | |
Fuel tank | 20 gal
75.7 L |
Engine details ...  | |
Gibson I Transmission | |
|---|---|
4-speed gear | |
Transmission details ...  |
Gibson I Power | |
|---|---|
Plows | 2-3 |
Drawbar (tested) | 29.1 hp
21.7 kW |
PTO (tested) | 36.82 hp
27.5 kW |
Belt (tested) | 41.03 hp
30.6 kW |
Performance test details ...  | |
Mechanical | |
|---|---|
Two-wheel drive | |
Final drives | bull gear |
Manual steering | |
Mechanical band brakes | |
Open operator station. | |
Power Take-off (PTO) | |
|---|---|
Rear PTO | live |
Rear PTO Type | 540 (1.375) |
Dimensions & Tires | |
|---|---|
Wheelbase | 94 inches
238 cm |
Weight | 4000 to 4512 pounds |
Front tire | 5.50-16 |
Rear tire | 10-38 |
Full dimensions and tires ...  | |
Belt Pulley | |
|---|---|
Diameter | 9.2 inches
23 cm |
Width | 7.5 inches
19 cm |
RPM | 1487 |
Speed | 3539 ft/min
1078.69 meters/min |
References | |
|---|---|
 | |
Gibson Tractors - Durability, lower operating costs, plus extra power. published in 1948 |
Engine
Engine Detail — 236.7 ci / 3.9 L Gasoline
Manufacturer | Hercules ZXD |
Fuel Type | Gasoline |
Configuration | 6-cylinder, liquid-cooled |
Displacement | 236.7 ci
3.9 L |
Bore/Stroke | 3.4375x4.125 inches
87 x 105 mm |
Air cleaner | oil bath |
Compression | 6.71:1 |
Rated RPM | 1800 |
Starter volts | 6 |
Coolant capacity | 17 qts
16.1 L |
Transmission
Transmission — 4 forward and 1 reverse gear
Type | gear |
Gears | 4 forward and 1 reverse |
Clutch | 254mm dry disc |
 | |
Dimensions
Gibson I Tires | |
|---|---|
Ag front | 5.50-16 |
Ag rear | 10-38 |
Ag rear | 11-38 |
12-38 | |
Dimensions | |
|---|---|
Wheelbase | 94 inches
238 cm |
Length | 127.25 inches
323 cm |
Height | 67 inches
170 cm |
Ground clearance | 25 inches
63 cm |
Rear tread | 49 to 90 inches
124 to 228 cm |
Gibson I Weight | |
|---|---|
Shipping | 4000 lbs
1814 kg |
Operating | 4512 lbs
2046 kg |
Ballasted | 7495 lbs
3399 kg |
Tests
Nebraska Tractor Test 408 | |
|---|---|
Gasoline 4-speed 2WD
May 8 - 12, 1949
Link: Nebraska Tractor Test 408 file | |
Belt power (max) | 41.03 hp
30.6 kW |
Belt fuel use (max) | 4.2 gal/hour
15.9 l/hour |
PTO performance | |
Power at rated engine speed | 36.82 hp
27.5 kW |
Fuel use | 3.6 gal/hour
13.6 l/hour |
Drawbar performance | |
Max power | 29.1 hp
21.7 kW |
Fuel use | 3.2 gal/hour
12.1 l/hour |
Gear 3 used for power test. | |
Max pull | 4676 lbs
2121 kg |
Gear 2 used for pull test. | |
Photos
Gibson I tractor photo
Recommended Implements & Sizing Guide
Engineering recommendations for Gibson I based on its 36.82 HP power envelope and ASAE agricultural standards.
| Implement & Operation | Recommended Size | Workload Rating | Engineering Notes |
|---|---|---|---|
Moldboard PlowPrimary Tillage | 2 to 3 Bottom (14-16")2 - 3 铧 (35-40 cm) | Medium Duty | Standard utility farm tillage. |
Rotary Cutter / MowerMowing & Clearing | 5 ft (60 in)1.5 m | Medium Duty | Pasture maintenance and weeds up to 1.5" diameter. |
Rotary TillerSeedbed Prep | 54 to 60 in135 - 150 cm | Medium Duty | Thorough seedbed preparation in orchards and vegetable plots. |
Disc HarrowSecondary Tillage | 5 to 6 ft (16-18" discs)1.5 - 1.8 m (40-45 cm 耙片) | Light Duty | Small acreage soil break-up and secondary aeration. |
Hay BalerHay & Forage | Small Square Baler (14x18")小方捆打捆机 (36x46 cm) | Medium Duty | Classic 2-string baler for horse and small livestock hay. |
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 Gibson I.
Estimated Continuous Field Runtime: 10.4 hrs
Approximately 10.4 hours of continuous field operation at ~75% rated power on a full tank (20 gal / 75.7 L).
Estimated 75% Load Fuel Burn~1.9 gal/hr (7.2 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
Gibson I Specification Unit Converter
Convert power, fluid capacities, and operating weights between metric and imperial standards for Gibson I.
Converted Equivalents:
Horsepower (HP)36.8 hp
Kilowatts (kW)27.5 kW
Metric Horsepower (PS / CV)37.3 PS
Direct Competitor Comparison
Compare Gibson I against same-era industry alternatives in the same horsepower class.
Current Model
Gibson
Gibson I
Engine Power:36.82 hp
27.5 kW
★ Baseline Reference
International HarvesterMarket Competitor
International Harvester 15-30
Engine Power:33.3
Production Years:1917 - 1921
McCormick-DeeringMarket Competitor
McCormick-Deering 15-30
Engine Power:33.3
Production Years:1923 - 1929
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Gibson D
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Gibson A
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