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International Harvester 1256 vs International Harvester 3688
Verdict: International Harvester 1256 vs International Harvester 3688
The International Harvester 1256 and the International Harvester 3688 are both tractors — here is how they stack up on the figures that matter. International Harvester 1256 leads on rated power with 116 hp against 114 hp. International Harvester 1256 is the lighter machine (9,940 kg vs 11,300 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. International Harvester 3688 is the newer design (1981 vs 1967). In short: choose the International Harvester 1256 for outright pulling power, or the International Harvester 3688 if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.
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Fit & specs
International Harvester
85
Fit score
Best match
Clear
International Harvester
85
Fit score
Best match
Clear
Rated power
116 hp
114 hp
Confidence
40%
40%
Guide price
—
—
Overview
Manufacturer
International HarvesterReference
International HarvesterReference
Four gears (1-4) in two ranges (low/high) plus reverse range. The Torque Amplifier (TA) allows a clutchless shift from direct drive (DD) to the lower TA speed in all gears and ranges.Reference
With 18.4-34R1 rear tires.Reference
Total built
—
2,572Reference
Final drives
—
bull gearReference
Differential lock
—
rearReference
Variants
Farmall 1256
row-cropReference
—
IH 1256
standardReference
—
3688 Hi-Clear
—
high-clearance modelReference
Engine
Fuel tank
159.0 LReference
—
Drawbar (tested)
76.1 kWReference
74.0 kWReference
Displacement
6.7 LReference
7.1 LReference
Bore/Stroke
110 x 117 mmReference
109 x 127 mmReference
Air cleaner
dual dry elementsReference
dual dry elmementReference
Compression
17:1Reference
16:1Reference
Rated RPM
2400Reference
2400Reference
Starter volts
12Reference
12Reference
Oil capacity
64.4 LReference
85.2 LReference
Coolant capacity
22.7 LReference
24.6 LReference
Power at rated engine speed
86.6 kWReference
84.8 kWReference
Max power
76.1 kWReference
74.0 kWReference
Drawbar (claimed)
—
74.7 kWReference
Idle RPM
—
900-2400Reference
Transmission
Gears
16 forward and 8 reverseReference
16 forward and 8 reverseReference
Transmission
Torque AmplifierReference
—
Clutch
—
355.6mm cerametallic discReference
PTO & Hydraulics
PTO (claimed)
84.3 kWReference
84.3 kWReference
PTO (tested)
86.6 kWReference
84.8 kWReference
Type
partial power shiftReference
partial power shiftReference
Valves
1Reference
2 to 4Reference
Pump flow
30.3 lpmReference
68.1 lpmReference
Rear Type
III/IIReference
IIReference
Rear PTO
independentReference
independentReference
Rear PTO Type
1000Reference
540/1000 (1.375)Reference
Engine RPM
1000@2100Reference
1000@2100Reference
Power at rated PTO speed
84.5 kWReference
83.9 kWReference
Hydraulic system
—
85.2 LReference
Capacity
—
85.2 LReference
Total flow
—
102.2 lpmReference
Steering flow
—
45.4 lpmReference
Control
—
draft sensingReference
Dimensions
Wheelbase
233 cmReference
266 cmReference
Weight
9940 to 11030 poundsReference
11300 to 13200 poundsReference
Front tire
10.00-16Reference
11L-15Reference
Rear tire
18.4-38 (Farmall)Reference
18.4-34Reference
Standard tires (ag)
Front: 11.00-16. Rear: 24.5-32 (International)Reference
—
Length
416 cmReference
467 cmReference
Width
233 cmReference
259 cmReference
Height (steering wheel)
218 cmReference
—
Bar rear axle
82 mmReference
—
Shipping
5003 kgReference
—
Operating
4719 kgReference
—
Ballasted
6264 kgReference
—
Ag front
—
11L-15Reference
Ag rear
—
18.4-34Reference
Height (cab)
—
284 cmReference
Shipping weight
—
5125 kgReference
Operating weight
—
5987 kgReference
Ground clearance
—
33 cmReference
Rear axle
—
82 by 2997 mmReference
Front tread
—
152 to 213 cmReference
Rear tread
—
167 to 326 cmReference
1256 Serial Numbers
1967
7501 (IH)Reference
—
1968
7703 (IH)Reference
—
1969
8444 (IH)Reference
—
Location:
Serial number place on the left side of the 1256, on the clutch housing.Reference
Serial number plate on the right side of the tractor frame, ahead of the rear axle.Reference
Electrical
Charging system
alternatorReference
—
Charging amps
55Reference
—
Batteries
2Reference
—
Battery volts
6Reference
12Reference
Battery AH
204Reference
—
Ground
—
negativeReference
Test results
Fuel use
28.8 l/hourReference
26.9 l/hourReference
Max pull
5036 kgReference
5556 kgReference
Speeds
Capacities
Fuel
—
189.2 LReference
3688 Serial Numbers
1981
—
501Reference
1982
—
1743Reference
1983
—
2482Reference
1984
—
2695Reference
1985
—
3068Reference
Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.