| Production | |
| Manufacturer | International Harvester |
| Utility tractor | |
| Built in Doncaster, England | |
| Original price was $21,100 in 1984 | |
| International Harvester 684 Engine | |
| International Harvester 3.9L 4-cyl diesel | |
| International Harvester 684 Transmissions | |
| 8-speed syncromesh | |
| 16-speed two-speed power shift | |
| International Harvester 684 Power | |
| Engine | 69 hp 51.5 kW |
| Drawbar (claimed) | 55.9 hp 41.7 kW |
| PTO (claimed) | 62.5 hp 46.6 kW |
| Plows | 4 |
| Drawbar (tested) | 54.56 hp 40.7 kW |
| PTO (tested) | 62.52 hp 46.6 kW |
| Mechanical | |
| Two- or four-wheel drive | |
| Power steering | |
| Independent hydraulic wet disc brakes | |
| ROPS canopy or cab optional |
| Capacity | |
| Fuel | 20 gal 75.7 L |
| Hydraulic system | 9 gal 34.1 L |
| Hydraulics | |
| Type | open center |
| Capacity | 9 gal 34.1 L |
| Valves | 1 or 2 |
| Pump flow | 13 gpm 49.2 lpm |
|   | 15.4 gpm (optional) 58.3 lpm |
| Tractor hitch | |
| Rear Type | II |
| Control | position and draft control |
| Rear lift | 3600 lbs 1632 kg |
| Power Take-off (PTO) | |
| Rear PTO | independent |
| Clutch | hydraulic wet disc |
| Rear PTO Type | 540 |
| Dimensions & Tires | |
| Utility Wheelbase | 88 inches 223 cm |
| Row-crop Wheelbase | 84.5 inches 214 cm |
| 4WD Wheelbase | 85.2 inches 216 cm |
| Low-profile Wheelbase | 83.75 inches 212 cm |
| Weight | 5620 to 6765 pounds |
| Front tire | 7.50-16 |
| Rear tire | 16.9-30 |
| 684 Serial Number Location | |
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| Serial number plate on the the front axle support on right side of tractor. |
| 684 Serial Numbers | |
| 1978 | 501 |
| 1979 | 1687 |
| 1980 | 3533 |
| 1981 | 6037 |
| 1982 | 8001 |
| 1983 | 8512 |
| 1984 | 9352 |
FAQ: How to read a serial number table. | |
| Electrical | |
| Ground | negative |
| Charging amps | 45 |
| Battery volts | 12 |
| References | |
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| 1985 Farm Equipment Buyer's Guide published by CaseIH | |
| 1979 Buyer's Guide published by International Harvester | |
| Buyer's Guide 1981 published by International Harvester | |
| Buyer's Guide 1982 published by International Harvester | |
| 84 Series Hi-Performers published in 1978, by International Harvester | |
| International Series 84 Utility/Row-Crop Tractors published in 1978, by International Harvester | |
| International Series 84 tractors published in 1982, by International Harvester | |
| International Series 84 Tractors published in 1983, by International Harvester | |
| Agricultural Equipment Reference Catalog published in 1980, by International Harvester |
| Page information | |
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| TractorData is a family-owned small business located in Minnesota that has been providing reference information on tractors since 1999. | |
| Peter Easterlund - owner/author | |
| Email: Peter@TractorData.com | |
| Updated on February 9, 2023 |