International Harvester 3788

The International Harvester 3788 is a tractor produced by International Harvester. It is equipped with a 466 ci 7.6 L engine. The listed engine power is 170.57 hp 127.2 kW. Transmission: Torque Amplifier. Operating weight: 16520 to 18620 pounds.

Engine Power

170.57 hp 127.2 kW

Fuel & Capacities

90 gal 340.7 L

Transmission

Torque Amplifier

Operating Weight

16520 to 18620 pounds

Overview

	1980 - 1981 30 2+2 SeriesFour-wheel Drive (4WD) tractor 30 2+2 Series Four-wheel Drive (4WD) tractor

Production
Manufacturer	International Harvester
Four-wheel Drive (4WD) tractor
Total built	2,496
Original price was $57,000 in 1981

International Harvester 3788 Engine
International Harvester 7.6L 6-cyl diesel
Fuel tank	90 gal 340.7 L
Engine details ...

International Harvester 3788 Transmission
12-speed two-range power shift
Transmission details ...

International Harvester 3788 Power
Drawbar (claimed)	146 hp 108.9 kW
PTO (claimed)	170.57 hp 127.2 kW
Drawbar (tested)	142.05 hp 105.9 kW
PTO (tested)	170.57 hp 127.2 kW
Performance test details ...

Mechanical
Four-wheel drive
Steering	hydrostatic power
Hydraulic wet disc brakes
Cab standard

Hydraulics
Type	closed center
Valves	2
Pump flow	12 gpm 45.4 lpm

Tractor hitch
Rear Type	III

Power Take-off (PTO)
Rear PTO	independent
Rear PTO Type	1000
Engine RPM	1000@2100

Dimensions & Tires
Wheelbase	110 inches 279 cm
Weight	16520 to 18620 pounds
Front tire	18.4-38
Rear tire	18.4-38
Full dimensions and tires ...

Electrical
Ground	negative
Charging system	alternator
Charging amps	72
	100 OptOptional
Batteries	2
Battery volts	12

References

Field Force published in 1981, by International Harvester
Buyer's Guide 1981 published by International Harvester
Operator's Manual 3388, 3588 and 3788 Tractors (1096188R3) published in 1979

Engine

Engine Detail — 466 ci / 7.6 L Diesel

Manufacturer	International Harvester DT-466B
Configuration	turbocharged diesel, 6-cylinder, liquid-cooled
Displacement	466 ci 7.6 L
Bore/Stroke	4.30x5.35 inches 109 x 136 mm
Rated RPM	2500
Idle RPM	780-2750
Starter volts	12
Oil capacity	20 qts 18.9 L
Coolant capacity	34 qts 32.2 L

Transmission

Transmission — Torque Amplifier

Transmission	Torque Amplifier
Type	two-range power shift
Gears	12 forward and 6 reverse
Clutch	356mm hydraulic dry disc
With 18.4-38 rear tires.

Dimensions

International Harvester 3788 Tires
Ag front	18.4-38
Ag rear	18.4-38

Dimensions
Wheelbase	110 inches 279 cm
Length	228 inches 579 cm
Width	101.6 inches 258 cm
Height (cab)	115.8 inches 294 cm
Clearance (front axle)	23.2 inches 58 cm
Clearance (rear axle)	26.7 inches 67 cm

International Harvester 3788 Weight
Shipping	16520 lbs 7493 kg
Operating	18620 lbs 8446 kg
Max capacity	23500 lbs 10659 kg

Tests

Nebraska Tractor Test 1377
Diesel 12-speed 4WD November 5 - 17, 1980 Link: Nebraska Tractor Test 1377 file
PTO performance
Power at rated engine speed	170.57 hp 127.2 kW
Fuel use	10.9 gal/hour 41.3 l/hour
Power at rated PTO speed	166.39 hp 124.1 kW
Fuel use	9.7 gal/hour 36.7 l/hour
Drawbar performance
Max power	142.05 hp 105.9 kW
Fuel use	10.7 gal/hour 40.5 l/hour
Gear 3-Low-Direct used for power test.
Max pull	19069 lbs 8649 kg
Gear 1-Low-Direct used for pull test.

Photos

International Harvester 3788

Recommended Implements & Sizing Guide

Engineering recommendations for International Harvester 3788 based on its 170.57 HP power envelope and ASAE agricultural standards.

Implement & Operation	Recommended Size	Workload Rating	Engineering Notes
Moldboard PlowPrimary Tillage	5 to 7 Bottom (18")5 - 7 铧 (45 cm)	Commercial / Field Scale	Large acreage tillage; requires front ballast weights.
Rotary Cutter / MowerMowing & Clearing	15 to 20 ft Batwing4.6 - 6.1 m 宽幅折叠翼	Commercial / Field Scale	Large commercial field and roadside mowing operations.
Rotary TillerSeedbed Prep	90 to 120 in Heavy Duty230 - 300 cm 重型旋耕机	Commercial / Field Scale	Deep intensive seedbed preparation for commercial row crops.
Disc HarrowSecondary Tillage	15 to 22 ft Folding Disc4.5 - 6.7 m 折叠式圆盘耙	Commercial / Field Scale	Wide commercial field leveling; requires hydraulic remotes.
Hay BalerHay & Forage	Large Square Baler (3x4 or 4x4)大方捆商用打捆机 (1.2x1.2 m)	Commercial / Field Scale	High-capacity commercial forage harvesting (1000 RPM PTO).

Sizing & Soil Condition NoteActual implement sizing varies depending on local soil conditions (heavy clay vs sandy loam), field slope, and operating speed. Heavy tillage implements may require front ballast weights and wheel weights.

Fluids, Capacities & Working Autonomy

Standard fluid requirements, service intervals, and continuous runtime estimates for International Harvester 3788.

Estimated Continuous Field Runtime: 10.1 hrs

Approximately 10.1 hours of continuous field operation at ~75% rated power on a full tank (90 gal / 340.7 L).

Estimated 75% Load Fuel Burn~8.9 gal/hr (33.6 L/hr)

Engine Crankcase Oil

SAE 15W-40 (Heavy Duty Diesel)

Standard Spec: API CK-4 / CJ-4 Heavy Duty

Service Interval: 150 – 250 Hours

Transmission & Hydraulic System

UTTO (Universal Tractor Transmission Oil)

Standard Spec: ISO VG 46 / 68 (Wet Brake & Trans Compatible)

Service Interval: 600 – 1000 Hours

Engine Cooling System

50/50 Ethylene Glycol Pre-mix

Standard Spec: ASTM D6210 / Heavy-Duty OAT Antifreeze

Service Interval: 2 Years / 1500 Hours