international harvester 3688

International Harvester 3688 tractor photo
1981 - 1985 30 SeriesRow-Crop tractor
1981 - 1985
30 Series
Row-Crop tractor
1981 - 1985
30 Series
Row-Crop tractor
1981 - 1985
30 Series
Row-Crop tractor
Transmission
Type
partial power shift
Gears
16 forward and 8 reverse
Clutch
355.6mm cerametallic disc
Oil capacity
90 qts 85.2 L
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.
Speeds
With 18.4-34R1 rear tires.
3688  partial power shift speeds
Shift Pattern
International Harvester 3688 transmission controls

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