Search
International Harvester 3788 vs International Harvester 6788
Verdict: International Harvester 3788 vs International Harvester 6788
The International Harvester 3788 and the International Harvester 6788 are both tractors — here is how they stack up on the figures that matter. Both are rated at the same 171 hp. International Harvester 6788 is the lighter machine (7,674 kg vs 16,520 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. International Harvester 6788 is the newer design (1981 vs 1980). Use the full side-by-side spec tables below to weigh the details against your own operation, and confirm with a dealer demo.
Tune the fit score
Tell us about your operation
Fit & specs
International Harvester
85
Fit score
Best match
Clear
International Harvester
85
Fit score
Best match
Clear
Rated power
171 hp
171 hp
Confidence
40%
40%
Guide price
—
—
Overview
Manufacturer
International HarvesterReference
International HarvesterReference
With 18.4-38 rear tires.Reference
With 18.4-38 tires.Reference
Total built
2,496Reference
347Reference
Steering
hydrostatic powerReference
—
Engine
Fuel tank
340.7 LReference
—
Drawbar (claimed)
108.9 kWReference
105.9 kWReference
Drawbar (tested)
105.9 kWReference
105.9 kWReference
Displacement
7.6 LReference
7.6 LReference
Bore/Stroke
109 x 136 mmReference
109 x 136 mmReference
Rated RPM
2500Reference
2500Reference
Idle RPM
780-2750Reference
—
Starter volts
12Reference
—
Oil capacity
18.9 LReference
89.4 LReference
Coolant capacity
32.2 LReference
32.2 LReference
Power at rated engine speed
127.2 kWReference
127.2 kWReference
Max power
105.9 kWReference
105.9 kWReference
Engine
—
149.1 kWReference
Power
—
149.1 kWReference
Transmission
Transmission
Torque AmplifierReference
—
Gears
12 forward and 6 reverseReference
12 forward and 6 reverseReference
Clutch
356mm hydraulic dry discReference
—
PTO & Hydraulics
PTO (claimed)
127.2 kWReference
126.8 kWReference
PTO (tested)
127.2 kWReference
127.2 kWReference
Type
two-range power shiftReference
two-range power shiftReference
Valves
2Reference
2 to 4Reference
Pump flow
45.4 lpmReference
68.1 lpmReference
Rear Type
IIIReference
III/IIReference
Rear PTO
independentReference
independentReference
Rear PTO Type
1000Reference
1000Reference
Engine RPM
1000@2100Reference
—
Power at rated PTO speed
124.1 kWReference
124.1 kWReference
Hydraulic system
—
89.3 LReference
Capacity
—
89.3 LReference
Steering flow
—
45.4 lpmReference
Dimensions
Wheelbase
279 cmReference
279 cmReference
Weight
16520 to 18620 poundsReference
7674 kgReference
Front tire
18.4-38Reference
18.4-38Reference
Rear tire
18.4-38Reference
18.4-38Reference
Ag front
18.4-38Reference
18.4-38Reference
Ag rear
18.4-38Reference
18.4-38Reference
Length
579 cmReference
579 cmReference
Width
258 cmReference
284 cmReference
Height (cab)
294 cmReference
—
Clearance (front axle)
58 cmReference
—
Clearance (rear axle)
67 cmReference
—
Front axle
82 mmReference
—
Bar rear axle
82 mmReference
82 mmReference
Shipping
7493 kgReference
—
Operating
8446 kgReference
—
Shipping weight
—
7674 kgReference
Ground clearance
—
72 cmReference
3788 Serial Numbers
1980
8801Reference
—
1981
10866Reference
8801Reference
Location:
Right side of tractor frame, by rear axle.Reference
transmission housing, right sideReference
Electrical
Ground
negativeReference
—
Charging system
alternatorReference
—
Charging amps
100Reference
—
Batteries
2Reference
—
Battery volts
12Reference
—
Capacities
Max capacity
10659 kgReference
—
Fuel
—
526.1 LReference
Test results
Fuel use
40.5 l/hourReference
40.5 l/hourReference
Max pull
8649 kgReference
8649 kgReference
Speeds
6788 Serial Numbers
1982
—
8810Reference
1983
—
8840Reference
1984
—
8871Reference
1985
—
8946Reference
International Harvester 6788 Height
Hood
—
202 cmReference
Cab
—
289 cmReference
Exhaust
—
318 cmReference
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.