International Harvester 3688 row-crop tractor: review and specs

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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