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International Harvester 3688

International Harvester 3688 tractor
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The International Harvester 3688 is a row-crop tractor produced from 1981 to 1985 as part of the 30 Series. Built in Rock Island, Illinois, USA, it features a 7.1L 6-cylinder diesel engine delivering approximately 124-126 hp estimated engine power. It offers a 16-speed partial power shift transmission, two- or four-wheel drive options, and a standard cab with heat and air-conditioning. The tractor has a fuel capacity of 50 gallons and a hydraulic system capacity of 22.5 gallons. Dimensions include a 105-inch wheelbase, 184-inch length, and operating weight up to 13,200 lbs. It is equipped with rear PTO independent at 540/1000 RPM and a draft sensing rear hitch. The 3688 was built in a total of 2,572 units and had an original price of $45,000 in 1981.
International Harvester 3688IH 3688tractor specsfarm tractor30 Seriesdiesel tractorrow-crop tractor
Power125 hp[P]
Founded1981 - 1985
Model3688

Technical Specifications

Detailed specifications and technical data for International Harvester 3688

Power

PTO (tested):113.72 hp (84.8 kW)
PTO (claimed):113 hp (84.3 kW)
Drawbar (tested):99.21 hp (74.0 kW)
Drawbar (claimed):100.2 hp (74.7 kW)

Engine

Type:diesel
Model:International Harvester D436
Cooling:liquid-cooled
Idle RPM:900-2400
Cylinders:6-cylinder
Rated RPM:2400
Air cleaner:dual dry elmement
Bore/Stroke:4.30x5.00 inches (109 x 127 mm)
Compression:16:1
Displacement:436 ci (7.1 L)
Oil capacity:14 qts (13.2 L)
Starter volts:12
Coolant capacity:26 qts (24.6 L)

Capacity

Fuel:50 gal (189.2 L)
Hydraulic system:22.5 gal (85.2 L)

Variants

3688 Hi-Clear:high-clearance model

Electrical

Ground:negative
Battery volts:12

Hydraulics

Type:closed center
Valves:2 to 4
Capacity:22.5 gal (85.2 L)
Pump flow:18 gpm (68.1 lpm)
Total flow:27 gpm (102.2 lpm)
Steering flow:12 gpm (45.4 lpm)

Mechanical

Cab:standard with heat and air-conditioning. Optional burgundy or western finish interiors.
Drive:Two- or four-wheel drive
Brakes:Hydraulic wet disc brakes
Final drives:bull gear
Power steering:yes
Differential lock:rear

Production

Type:Row-Crop tractor
Series:30 Series
Built in:Rock Island, Illinois, USA
Total built:2,572
Original price:$45,000 in 1981
Years produced:1981 - 1985

Transmission

Type:partial power shift
Gears:16 forward and 8 reverse
Clutch:355.6mm cerametallic disc
Description:Left lever selects gear, right lever selects high, low, or reverse range. Tractor may be shifted on the move without the clutch between gear pairs (1-2, 3-4, etc). Synchronized shifting, using the clutch, between gear pairs (2 to 3, 4 to 5, etc). The transmission is four-gear with the powershift provided by an electric solenoid actuated Torque Amplifier.
Oil capacity:90 qts (85.2 L)

Tractor hitch

Control:draft sensing
Rear Type:II

Serial Numbers

1981:501
1982:1743
1983:2482
1984:2695
1985:3068
Location:Serial number plate on the right side of the tractor frame, ahead of the rear axle.

Dimensions & Tires

Width:102 inches (259 cm) (Width at minimum tread.)
Length:184 inches (467 cm)
Rear axle:3.25 by 104 inches (82 by 2641 mm), 3.25 by 118 inches (82 by 2997 mm)
Rear tire:18.4-34
Wheelbase:105 inches (266 cm)
Front tire:11L-15
Rear tread:66 to 128.5 inches (167 to 326 cm)
Front tread:60 to 84 inches (152 to 213 cm)
Height (cab):112 inches (284 cm)
Shipping weight:11300 lbs (5125 kg)
Ground clearance:13 inches (33 cm)
Operating weight:13200 lbs (5987 kg)

Power Take-off (PTO)

Rear PTO:independent
Engine RPM:540@2100, 1000@2100
Rear PTO Type:540/1000 (1.375)

Related Models

International Harvester 3488

Model:3488