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Years in Production / 1981–1985
International Harvester
3688
Explore the specifications, hardware, and original references for the International Harvester 3688.
125hp
Engine estimate · from PTO
MFWD Optional
Drive
1981–1985
Production years
International Harvester
Manufacturer
3688 / 01
At a glance
Overview
1981 - 1985
30 Series
Row-Crop tractor
Production
Row-Crop tractor
Built in Rock Island, Illinois, USA
Original price was $45,000 in 1981
- Manufacturer
- International Harvester
- Total Built
- 2,572
Mechanical
Two- or four-wheel drive
Power steering
Hydraulic wet disc brakes
Cab standard with heat and air-conditioning. Optional burgundy or western finish interiors.
- Final Drives
- bull gear
- Differential Lock
- rear
Capacity
- Fuel
- 50 gal189.2 L
- Hydraulic System
- 22.5 gal85.2 L
Hydraulics
- Type
- closed center
- Capacity
- 22.5 gal85.2 L
- Valves
- 2 to 4
- Pump Flow
- 18 gpm68.1 lpm
- Total Flow
- 27 gpm102.2 lpm
- Steering Flow
- 12 gpm45.4 lpm
Hitch
- Rear Type
- II
- Control
- draft sensing
Pto
- Rear Pto
- independent
- Rear Type
- 540/1000 (1.375)
- Engine Rpm
- 540@2100
- Engine Rpm
- 1000@2100
Electrical
- Ground
- negative
- Battery Volts
- 12
3688 / 02
Under the hood
Engine Detail
International Harvester D436
diesel
6-cylinder
liquid-cooled
- Displacement
- 436 ci7.1 L
- Bore Stroke
- 4.30x5.00 inches109 x 127 mm
- Air Cleaner
- dual dry elmement
- Compression Ratio
- 16:1
- Rated Rpm
- 2400
- Idle Rpm
- 900-2400
- Starter Volts
- 12
- Coolant Capacity
- 26 qts24.6 L
- Fuel Type
- diesel
- Cylinders
- 6
- Cooling
- liquid-cooled
- Oil Capacity
- 14 qts13.2 L
Engine Options
International Harvester 7.1L 6-cyl diesel
3688 / 03
Gears & controls
Transmission
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.
- Transmission Type
- partial power shift
- Gears
- 16 forward and 8 reverse
- Clutch
- 355.6mm cerametallic disc
- Oil Capacity
- 90 qts85.2 L
- Speeds Description
- With 18.4-34R1 rear tires.
International Harvester3688 Transmission
16-speed partial power shift
3688 / 04
Size. Stance. Footprint.
Dimensions
- Length
- 184 in467 cm
- Width
- 102 in259 cm
- Height (cab)
- 112 in284 cm
- Wheelbase
- 105 in266 cm
- Ground clearance
- 13 in33 cm
- Front tread
- 60 in152 cm
- Rear tread
- 66 in167 cm
Dimensions And Tires
- Wheelbase
- 105 inches266 cm
- Weight
- 11300 to 13200 pounds
- Front Tire
- 11L-15
- Rear Tire
- 18.4-34
Tires And Tracks
- Front Ag
- 11L-15
- Rear Ag
- 18.4-34
See it in action
Videos
Watch International Harvester 3688 videos from their original YouTube creators.
3688 / 06
Tests (NTTL)
Nebraska Tractor Test 1440
Diesel 16-speed 2WDMay 26, 1982 - June 7, 1962
PTO performance
Drawbar performance
- Id
- 1440
- Power At Rated Engine Speed
- 113.72 hp84.8 kW
- Fuel Use
- 7.5 gal/hour28.4 l/hour
- Fuel Use
- 7.1 gal/hour26.9 l/hour
- Power At Rated Pto Speed
- 112.48 hp83.9 kW
- Max Power
- 99.21 hp74.0 kW
- Max Pull
- 12250 lbs5556 kg