International Harvester 3688 Specs ( 1981-1985 )
Production
| Description | Row-Crop tractor / Built in Rock Island, Illinois, USA / Original price was $45,000 in 1981 |
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| Manufacturer | International Harvester |
| Total built | 2,572 |
Engine
| Engine type | International Harvester 7.1L 6-cyl diesel |
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| Air cleaner | dual dry elmement |
| Bore/Stroke | 4.30x5.00 inches (109 x 127 mm) |
| Compression | 16:1 |
| Coolant capacity | 26 qts (24.6 L) |
| Description | International Harvester D436 / diesel / 6-cylinder / liquid-cooled |
| Displacement | 436 ci (7.1 L) |
| Idle RPM | 900-2400 |
| Rated RPM | 2400 |
| Starter volts | 12 |
| Oil capacity | 14 qts (13.2 L) |
| Drawbar (claimed) | 100.2 hp (74.7 kW) |
| Drawbar (tested) | 99.21 hp (74.0 kW) |
| PTO (claimed) | 113 hp (84.3 kW) |
| PTO (tested) | 113.72 hp (84.8 kW) |
Transmission
| Clutch | 355.6mm cerametallic disc |
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| Gears | 16 forward and 8 reverse |
| Oil capacity | 90 qts (85.2 L) |
| Transmission type | 16-speed partial power shift |
| Type | partial power shift |
Mechanical
| Cab | Cab standard with heat and air-conditioning. Optional burgundy or western finish interiors. |
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| Description | Power steering / Hydraulic wet disc brakes |
| Differential lock | rear |
| Drive type | Two- or four-wheel drive |
| Final drives | bull gear |
Capacity
| Fuel | 50 gal (189.2 L) |
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| Hydraulic system | 22.5 gal (85.2 L) |
Hydraulics
| Capacity | 22.5 gal (85.2 L) |
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| Pump flow | 18 gpm (68.1 lpm) |
| Steering flow | 12 gpm (45.4 lpm) |
| Total flow | 27 gpm (102.2 lpm) |
| Type | closed center |
| Valves | 2 to 4 |
Hitch
| Control | draft sensing |
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| Rear Type | II |
PTO
| Engine RPM | 540@2100 |
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| Rear PTO | independent |
| Rear PTO Type | 540/1000 (1.375) |
Electrical
| Battery volts | 12 |
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| Ground | negative |
Dimensions & Tires
| Front tread | 60 to 84 inches (152 to 213 cm) |
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| Ground clearance | 13 inches (33 cm) |
| Height (cab) | 112 inches (284 cm) |
| Length | 184 inches (467 cm) |
| Operating weight | 13200 lbs (5987 kg) |
| Rear axle | 3.25 by 104 inches (82 by 2641 mm) / 3.25 by 118 inches (82 by 2997 mm) |
| Rear tread | 66 to 128.5 inches (167 to 326 cm) |
| Shipping weight | 11300 lbs (5125 kg) |
| Wheelbase | 105 inches (266 cm) |
| Width | 102 inches*Width at minimum tread. (259 cm) |
| Front tire | 11L-15 |
| Rear tire | 18.4-34 |
| Weight | 11300 to 13200 pounds |
| Wheelbase | 105 inches (266 cm) |
| Ag front | 11L-15 |
| Ag rear | 18.4-34 |
3688 Serial Numbers
| 1981 | 501 |
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| 1982 | 1743 |
| 1983 | 2482 |
| 1984 | 2695 |
| 1985 | 3068 |
| Description | FAQ: How to read a serial number table. |
| Location: | Serial number plate on the right side of the tractor frame, ahead of the rear axle. |
Nebraska Tractor Test 1440
| Description | Diesel 16-speed 2WDMay 26, 1982 - June 7, 1962Link: Nebraska Tractor Test 1440 file / PTO performance / Drawbar performance |
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| Fuel use | 7.5 gal/hour (28.4 l/hour) / 7.1 gal/hour (26.9 l/hour) / 7.5 gal/hour (28.4 l/hour) |
| Max power | 99.21 hp (74.0 kW) |
| Max pull | 12250 lbs (5556 kg) |
| Power at rated engine speed | 113.72 hp (84.8 kW) |
| Power at rated PTO speed | 112.48 hp (83.9 kW) |
References
| Description | Buyer's Guide 1982 published by International Harvester / International 30 Series Tractors published by International Harvester / Operator's Manual 3088, 3288, 3488-Hydro and 3688 Tractors (1258513C1) published in 1981 / Tractors 90 & 110 HP published in 1981, by International Harvester / 3288 and 3688 Product Guide published in 1981, by International Harvester |
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Speeds
| Description | With 18.4-34R1 rear tires. |
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Variants
| 3688 Hi-Clear | high-clearance model |
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