International Harvester 806 Overview
The International Harvester 806 is a larger 1960s row-crop and field tractor built from 1963 through 1967. Engine choices include 361 cubic inch and 301 cubic inch six-cylinder entries, and transmission data includes both 8 forward / 4 reverse and 16 forward / 8 reverse setups.
The main working specs are an independent 1000-rpm rear PTO, hitch data listing Category II rear type and IH Fast Hitch, open-center hydraulics with 12 gpm pump flow, and a listed weight range of 8,460 to 9,220 pounds. Nebraska Test 857 lists 94.93 PTO horsepower and 84.77 drawbar horsepower for a Farmall 806 diesel Torque Amplifier 2WD configuration.
The 806 needs to be read by configuration. Farmall and International variants, engine/fuel version, Torque Amplifier equipment, hitch type, PTO equipment, and serial year can all affect which specs and parts apply.
International Harvester 806 Quick Answers
- Production yearsThe International Harvester 806 was produced from 1963 through 1967.
- PowerNebraska Test 857 lists 94.93 PTO horsepower and 84.77 drawbar horsepower for a Farmall 806 diesel Torque Amplifier 2WD configuration.
- EngineThe International Harvester 806 engine choices include 361 cubic inch / 5.9 L and 301 cubic inch / 4.9 L entries.
- PTO and hitchThe 806 is listed with an independent 1000-rpm rear PTO. Hitch data lists Category II rear type and IH Fast Hitch, so match the tractor's actual hitch equipment.
- Service capacityPublished capacities include 17 gallons for the hydraulic system, 42 gallons of fuel, and 24 quarts of coolant.
Engine and Power
The International Harvester 806 engine choices include both 361 cubic inch and 301 cubic inch entries. Keep displacement, fuel-version, and power claims separate unless the source identifies the exact engine and tractor variant.
Diesel engine
International Harvester D-361 / diesel / 6-cylinder / liquid-cooled
| Displacement | 361 ci 5.9 L |
|---|---|
| Bore Stroke | 4.125x4.50 inches 105 x 114 mm |
| Air Cleaner | dual dry |
| Rated Rpm | 2400 |
| Idle Rpm | 900-2400 |
| Starter Volts | 12 |
| Coolant Capacity | 24 qts 22.7 L |
Gasoline engine
Interntional Harvester C301 / gasoline / 6-cylinder / liquid-cooled
| Displacement | 301 ci 4.9 L |
|---|---|
| Bore Stroke | 3.8125x4.39 inches 97 x 112 mm |
| Compression | 7.7:1 |
| Rated Rpm | 2400 |
| Starter Volts | 12 |
LP-gas engine
International Harvester / LP gas / 6-cylinder / liquid-cooled
| Displacement | 301 ci 4.9 L |
|---|---|
| Bore Stroke | 3.8125x4.39 inches 97 x 112 mm |
| Compression | 8.71:1 |
| Rated Rpm | 2400 |
| Starter Volts | 12 |
Manufacturer
Manufacture years
Transmission
The transmission data is important because the 806 can be listed with an 8 forward / 4 reverse setup or a 16 forward / 8 reverse Torque Amplifier partial power shift setup. Transmission equipment affects clutch work, PTO behavior, and parts matching.
8-speed unsynchronized
| Type | unsynchronized |
|---|---|
| Gears | 8 forward and 4 reverse |
Torque Amplifier
| Name | Torque Amplifier |
|---|---|
| Type | partial power shift |
| Gears | 16 forward and 8 reverse |
PTO and Hitch
The 806's independent 1000-rpm rear PTO is a major implement-matching detail. Hitch data lists Category II rear type and IH Fast Hitch, so match implement requirements against the tractor's actual hitch and PTO equipment.
Rear PTO
Rear PTO type
Rear hitch
Hydraulics
Hydraulic specs for the International Harvester 806 list an open-center system with 12 gpm pump flow, 24 gpm total flow, 9 gpm steering flow, and 17 gallons of hydraulic capacity. Pump condition, remote valves, hitch equipment, and implement setup still affect how those numbers behave in use.
Type
Capacity
Pump flow
Total flow
Fluids, Battery, and Service Facts
The strongest maintenance data for the 806 is capacity-based: 17 gallons for the hydraulic system, 42 gallons of fuel, 24 quarts of coolant, and diesel electrical listings for two 6-volt batteries. Fluid types, filter numbers, belts, and battery-group recommendations need matching parts or manual evidence before they should be treated as final.
Fuel tank
Hydraulic system
Battery volts
Battery Ah
Tires and Dimensions
Tire and dimension values can vary by wheel, axle, and configuration.
Configuration-specific values are split out where the same model has documented differences by engine, transmission, or equipment.
Wheelbase
Weight
Length
Width
Front tire
Rear tire
Ag front
Ag rear
- 18.4-34
- 23.1-34
Electrical
Electrical rows are included when documented.
Ground
Charging system
Charging amps
Battery volts
Serial Number Lookup
The serial table gives starting serials by model year for 1963 through 1967. Use it as a year-narrowing aid, then keep Farmall or International variant, engine version, transmission setup, and hitch equipment tied to the actual tractor.
1963
1964
1965
1966
1967
Manuals and Documents
The documents below add manual, parts, and test context for the International Harvester 806. They are useful for controls, Torque Amplifier operation, lubrication, service categories, parts matching, and tested-performance details that do not fit into short spec rows.
Match coverage carefully before relying on a document for service decisions, especially when a source spans Farmall/International variants, fuel types, transmissions, or engine-serial ranges.
- Farmall 806 operator manual previewReproduction preview source for Farmall 806 operator manual coverage; verify variant fit before relying on it for service.Open preview PDF
- Farmall 806 service manual reprintService manual reprint source for Farmall 806 gas and diesel tractors; match coverage against the tractor's actual variant before using it for service.View service manual
- Farmall 806 parts diagramsOEM-derived Case IH parts diagram source for Farmall 806 assemblies and parts matching.View parts diagrams
- International 806 D-361 diesel parts diagram exampleOEM-derived Case IH parts diagram example with D-361 diesel engine-serial applicability; use it as an applicability cue, not a complete all-variants parts catalog.View parts diagrams
- Nebraska Test 857: Farmall 806 dieselOfficial Nebraska test report for a Farmall 806 diesel Torque Amplifier test configuration.Open test report
Parts Checks Before Ordering
Do not order International Harvester 806 parts from the model name alone. Match the part to the tractor's serial year, engine version, Torque Amplifier/transmission setup, PTO equipment, hitch type, and hydraulic equipment before choosing service parts.
Filters, fluids, belts, electrical parts, clutch and PTO parts, and hydraulic parts can vary by setup. Exact part numbers need a parts catalog, manual, or trusted supplier source before they become recommendations.
Accuracy Note
Tractor specifications can vary by year, region, factory configuration, installed equipment, and later repairs. Match serial range, engine, transmission, PTO setup, and model code before ordering parts or doing service work.