The International Harvester 3688 is a 2WD/4WD row-crop tractor from the 30 series. This tractor was manufactured by International Harvester in Rock Island, Illinois, USA from 1981 to 1985. The International Harvester 3688 is equipped with a 7.1 L (436.0 cu·in) six-cylinder diesel engine and a partial power shift transmission with 16 forward and 8 reverse gears.
The IH 3688 row-crop tractor used the International Harvester D436 engine. It is a 7.1 L, 7,145 cm2, (436.0 cu·in) six-cylinder natural aspirated diesel engine with 109.0 mm (4.29 in) of the cylinder bore and 127.0 mm (5 in) of the piston stroke. The compression ratio rating is 16.0:1. This engine produced 114.6 PS (84.3 kW; 113.0 HP) at 2,400 rpm of PTO output power.
The International Harvester 3688 is equipped with power steering, hydraulic wet disc brakes, cab (standard) with heat and A/C and 189.3 liters (50 US gal.; 41.6 Imp. gal) fuel tank.
International Harvester 3688 Specifications
| General Specifications | |
| Model | International Harvester 3688 |
| Length | 4,670 mm (183.9 in) |
| Width | 2,590 mm (102 in) |
| Height (cab) | 2,840 mm (111.8 in) |
| Wheel base | 2,660 mm (104.7 in) |
| Ground clearance | 330 mm (13 in) |
| Weight (operating) | 5,990 kg (13,206 lbs) |
| Fuel tank capacity | 189.3 liters (50 US gal.; 41.6 Imp. gal) |
| Battery | 12V |
| Cabin type | Cab (standard) with heat and A/C |
| Engine | |
| Engine model | International Harvester D436 |
| Engine type | Four-stroke, liquid-cooled, inline |
| Cylinders | 6 |
| Fuel type | Diesel |
| Displacement | 7.1 L, 7,145 cm2, (436.0 cu·in) |
| Bore and stroke | 109.0 mm X 127.0 mm (4.29 in X 5 in) |
| Compression ratio | 16.0:1 |
| Horsepower | 114.6 PS (84.3 kW; 113.0 HP) at 2,400 rpm |
| Starter | Electric |
| Oil capacity: | 13.2 L (13.9 US. qt, 11.6 Imp. qt.) |
| Coolant capacity: | 24.6 L (26 US. qt, 21.6 Imp. qt.) |
| Transmission and chassis | |
| Chassis | 4×2 2WD or 4×4 MFWD 4WD |
| Steering type | Power |
| Brakes | Hydraulic wet disc |
| Transmission model | – |
| Transmission type | Partial power shift with cerametallic disc clutch |
| Gears | 16 forward and 8 reverse |
| Speed | Forward: 30.7 kmh (19.1 mph) Reverse: 15.1 kmh (9.4 mph) |
| Transmission oil capacity | 85.2 L (22.5 US. gal, 18.7 Imp. gal.) |
| Tires | |
| Front tires | Ag: 11L-15 |
| Rear tires | Ag: 18.4-34 |
| Three-Point Hitch | |
| Category | II |
| Control type | Draft sensing |
| Lift capacity (at ends) | – |
| PTO (Power take-off shaft) | |
| Rear PTO type | Independent |
| Rear PTO speed | 540/1000 rpm |
| Hydraulic system | |
| Hydraulic type | Open center |
| Hydraulic capacity | 85.2 L (22.5 US. gal, 18.7 Imp. gal.) |
| Valves | 2 to 4 |
| Pump flow | 18.0 gpm (68.1 lpm) |
| Steering flow | 12.0 gpm (45.4 lpm) |
| Total flow | 27.0 gpm (102.2 lpm) |
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