Gibson I: all source data
All 51 values recorded for this model, as the source lists them and in its units. The spec sheet shows the same data checked, typed and converted.
Overview
Production| Manufacturer | Gibson |
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| (no label) | Row-Crop tractor |
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| (no label) | Built in Longmont, Colorado, USA |
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Engine| (no label) | Hercules 3.9L 6-cyl gasoline |
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| Fuel tank | 20 gal | 75.7 L |
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Transmission| (no label) | 4-speed gear |
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Power| Plows | 2-3 |
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| Drawbar (tested) | 29.1 hp | 21.7 kW |
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| PTO (tested) | 36.82 hp | 27.5 kW |
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| Belt (tested) | 41.03 hp | 30.6 kW |
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Mechanical| (no label) | Two-wheel drive |
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| Final drives | bull gear |
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| (no label) | Manual steering |
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| (no label) | Mechanical band brakes |
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| (no label) | Open operator station. |
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Pto| Rear PTO | live |
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| Rear PTO Type | 540 (1.375) |
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Dimensions| Wheelbase | 94 inches | 238 cm |
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| Weight | 4000 to 4512 pounds |
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| Front tire | 5.50-16 |
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| Rear tire | 10-38 |
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Belt pulley| Diameter | 9.2 inches | 23 cm |
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| Width | 7.5 inches | 19 cm |
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| RPM | 1487 |
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| Speed | 3539 ft/min | 1078.69 meters/min |
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Engine
Engine detail| (no label) | Hercules ZXD |
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| (no label) | gasoline |
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| (no label) | 6-cylinder |
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| (no label) | liquid-cooled |
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| Displacement | 236.7 ci | 3.9 L |
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| Bore/Stroke | 3.4375x4.125 inches | 87 x 105 mm |
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| Air cleaner | oil bath |
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| Compression | 6.71:1 |
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| Rated RPM | 1800 |
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| Starter volts | 6 |
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| Coolant capacity (Coolant) | 17 qts | 16.1 L |
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Transmission
Transmission| Type | gear |
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| Gears | 4 forward and 1 reverse |
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| Clutch | 254mm dry disc |
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Dimensions
Tires| Ag front | 5.50-16 |
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| Ag rear | 10-38 |
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| Ag rear | 11-38 |
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| Ag rear | 12-38 |
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Dimensions| Wheelbase | 94 inches | 238 cm |
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| Length | 127.25 inches | 323 cm |
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| Height | 67 inches | 170 cm |
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| Ground clearance | 25 inches | 63 cm |
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| Rear tread | 49 to 90 inches | 124 to 228 cm |
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Weight| Shipping | 4000 lbs | 1814 kg |
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| Operating | 4512 lbs | 2046 kg |
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| Ballasted | 7495 lbs | 3399 kg |
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