Target Audience:
Farmers, agricultural contractors, and machinery enthusiasts seeking a reliable 2-plow tractor for medium-duty farming.
Market Context:
Introduced as a larger alternative to the Model 720, aimed at large farms requiring increased power and productivity.
Advanced Engineering:
High-compression, diesel or LP-gas engine options, live PTO, and power steering available.
Durability:
Heavy-duty construction with proven reliability, suitable for prolonged use.
Coverage Areas:
Complete tear-down, inspection, overhaul, and assembly procedures for the entire tractor.
Page Count:
Approximately 1300 pages (factory manual).
Manual Type:
Factory Service Technical Manual
Format:
PDF digital download
Engine:
Detailed repair procedures for all engine components including cylinder head, valves, pistons, and crankshaft.
Cooling System:
Inspection, testing, and replacement of radiator, water pump, thermostat, and hoses.
Electrical System:
Wiring diagrams, starter, generator, charging circuit, and lighting systems.
Fuel System:
Fuel tank, lines, filters, pump, and carburetor (gas) or injection pump (diesel) adjustments.
Power Train:
Clutch, transmission, differential, final drives, and PTO.
Hydraulic System:
Hydraulic pump, control valve, cylinders, and lines for three-point hitch and auxiliary hydraulics.
Steering and Brakes:
Mechanical and power steering units, brake adjustment and relining.
Wheels and Tires:
Wheel removal, tire inflation, and front axle alignment.
Service Specifications:
Torque values, clearances, capacities, and adjustment data.
Diagnostic Procedures:
Systematic troubleshooting for major systems.
Disassembly and Assembly:
Step-by-step instructions for component removal and installation.
Special Tools:
List of required service tools and their usage.
Target Audience:
Written for professional mechanics and knowledgeable DIYers with a foundation in tractor mechanics.
Diagrams:
Includes high-quality illustrations and exploded views for clear part identification.
Part Numbers:
Genuine John Deere part numbers referenced throughout.
Interchangeability:
Cross-reference for models 720 and 820 where applicable.
File Format:
PDF (portable document format)
Compatibility:
Compatible with all devices supporting PDF, including Windows, Mac, iOS, and Android.
Requirements:
Adobe Reader or any PDF viewer.
Searchability:
Bookmarked and text-searchable for quick navigation.
Resolution:
High-resolution scanning ensures clear text and diagrams.
Printable:
Manual is printable; recommended for workshop use.
Binding Type:
Digital (unbound)
Paper Type:
N/A - digital download only
Diesel Engine:
John Deere 4.5L, 4-cylinder, 70 hp (gross) at 2,000 rpm.
LP-Gas Engine:
Similar displacement, operating on liquefied petroleum gas, with slightly different power ratings.
Gross Power:
Approximately 70 hp for diesel version.
PTO Power:
Approximately 60 hp.
Fuel Type:
Diesel or LP-gas.
Fuel Tank Capacity:
Approximately 40 gallons (diesel) or 70 gallons (LP-gas).
Type:
Constant-mesh, selective sliding gear.
Speeds:
8 forward speeds (with optional range) and 2 reverse.
Optional:
Roll-O-Matic front axle for better ride; not a transmission change.
Live PTO:
Standard independent PTO that can be engaged/disengaged while moving.
Hydraulic Control:
Power Shift? Not available; standard manual shift only.
Wheelbase:
Approximately 87 inches (221 cm).
Length:
Approximately 146 inches (371 cm).
Width:
Adjustable, typically 64-80 inches (163-203 cm).
Height:
Approximately 64 inches (163 cm) to top of exhaust.
Curb Weight:
Approximately 8,200 lbs (3,719 kg), varying with equipment.
N/A:
Not applicable for tractors.
Brakes:
Hand and foot brakes for secure parking and stopping.
Steering:
Mechanical standard; optional power steering reduces operator effort.
Rollover Protection:
Original tractors were not equipped with ROPS; aftermarket kits are available.
Shielding:
Engine and PTO shields provided for basic protection.
Engine Oil:
Change every 100 hours or annually.
Oil Filter:
Replace with engine oil change.
Air Filter:
Clean and oil (if oil-bath) or replace every 100 hours or when dirty.
Hydraulic Oil:
Check level daily; change every 500 hours or as needed.
Transmission Oil:
Check level; change every 500 hours.
Engine Oil:
API service classification CC/SD; SAE 30 for general use, or 20W-40 if operating below -10°C.
Hydraulic Oil:
Use John Deere Type 303 or equivalent hydraulic/transmission oil.
Coolant:
50/50 water and ethylene glycol-based antifreeze.
Known Issues and Common Wear Items
Electrical Wiring:
Old wiring may deteriorate and require replacement due to age.
Injectors:
Diesel injectors may need periodic cleaning and calibration.
Seals:
Hydraulic cylinder seals wear over time and may leak.
Brakes:
Brake linings wear and may need adjustment.
Manufacturer:
John Deere (Deere & Company), an American manufacturer known for agricultural machinery since 1837.
Predecessor:
John Deere 720 (1952-1956).
Successor:
John Deere 830 and later 3010/3020 series.
Evolution:
The 820 was a larger, more powerful version of the 720, with improved hydraulic and PTO features.
Assembled In:
Waterloo, Iowa, USA.
Historical Significance:
The 820 series is regarded as a classic among collectors and is known for its robustness and reliability.
Collector Interest:
Highly sought after in classic tractor circles.
Industry Reputation:
John Deere's 'Two-Cylinder' era tractors, including the 820, are widely acclaimed for their engineering.
