7720, 7820 and 7920 Tractors
Copyright 2005 (c) Deere & Company. THIS DATA IS THE PROPERTY OF DEERE & COMPANY. ALL USE AND/OR REPRODUCTION NOT SPECIFICALLY AUTHORIZED BY DEERE & COMPANY IS PROHIBITED.
All information, illustrations and specifications in this manual are based on the latest information available at the time of publication. The right is reserved to make changes at any time without notice.
Foreword
Look For Supplemental Information
Quick Reference Specifications
Section : 05 - Safety
Recognize Safety Information
Understand Signal Words
Follow Safety Instructions
Prevent Machine Runaway
Use Seat Belt Properly
Operating the Tractor Safely
Stopping and Parking Tractor
Keep Riders Off Machine
Avoid Eye Contact With Radar
Handle Fuel Safely-Avoid Fires
Prepare for Emergencies
Handle Starting Fluid Safely
Wear Protective Clothing
Protect Against Noise
Avoid Contact with Pesticides
Stay Clear of Rotating Drivelines
Use Safety Lights and Devices
Use a Safety Chain
Transport Towed Equipment at Safe Speeds
Use Caution on Hillsides
Freeing a Mired Machine
Transport Tractor Safely
Service Cooling System Safely
Practice Safe Maintenance
Support Machine Properly
Service Front-Wheel Drive Tractor Safely
Remove Paint Before Welding or Heating
Avoid Heating Near Pressurized Fluid Lines
Avoid High-Pressure Fluids
Do Not Open High-Pressure Fuel System
Service Accumulator Systems Safely
Handling Batteries Safely
Store Attachments Safely
Dispose of Waste Properly
Section : 10 - Safety Signs
Replace Damaged or Missing Safety Signs
Safety Signs-Cab
Safety Signs-External (Front)
Safety Signs-External (Sides)
Safety Signs-External (Rear)
Section : 15 - Controls and Instruments
Front Console
Ignition Switch
Corner Post Display
STOP, Service Alert and Information Indicators
Digital Indicators-Tachometer, Ground Speed and Transmission
Gauges-Fuel Level, Engine Oil Pressure and Coolant Temperature
Side Console
Switch Identifications
Right-Hand Control Console-PowrQuad-Plus™ (PQ+) or AutoQuad-Plus™ (AQ+) Transmission
CommandArm™ Controls-AutoPowr Transmission
Electrohydraulic Multi-Function Control (If Equipped)
Foot Operated Throttle Control
Secondary Hand Brake Lever
PTO Mode/Shift Lever (If Equipped)
Pick-Up Hitch Lock Pin Lever (If Equipped)
Rear Hitch Raise/Lower Switches-External
Front Hitch Raise/Lower Switch-External (If Equipped)
Rear PTO Switch-External
Section : 16 - CommandCenter™
CommandCenter™ Panel
CommandCenter Split-Screen-Constant Top-Half Display
CommandCenter Split Screen-Selectable Bottom-Half Display
CommandCenter-Settings
Setting Day Backlight, Night Backlight and Screen Contrast
Setting PTO Engagement Acceleration (Rear PTO - Standard, Front PTO - If Equipped)
Setting Implement Selection
Selecting Units and Language
Using Diagnostics, Stored Codes and CAN Statistics
Setting Clock and Service Alarm Interval
Vehicle Speed Calibration (Single Beam Radar Sensor)
Vehicle Speed Calibration (Dual Beam Radar Sensor)
Section : 20 - Lights
Headlight/Floodlight Identification and CommandCenter Indicators
Programming Headlights and Floodlights
Operating Lights
Front Hitch or Loader Lights and CommandCenter Indicator (If Equipped)
Operating Turn Signals and High/Low Beam
Using Delayed Egress Lighting (If Equipped)
Operating Hazard Light
Operating Rotary Beacon Light (If Equipped)
Using Seven-Terminal Outlet
Section : 25 - Operator Station
Adjusting ComfortCommand Seat (If Equipped)
Adjusting Active Seat (If Equipped)
Operator Presence Sensor
Adjusting CommandArm™ Position
Operating Cab Heat, Defrost and Air Conditioning (Standard Equipment)
Using ClimaTrak™ (ATC) (If Equipped)
Operating Windshield Wiper and Washer
Operating Rear Window Wiper and Washer (If Equipped)
Adjusting Steering Wheel and Column
Operating Horn
Installing Mobile Radio and Antenna (If Mobile Radio Ready)
Using Field Office (If Equipped)
Using Instructional Seat (If Equipped)
Using Electrical Outlets
Using Auxiliary Power Strip
GREENSTAR™ System Connections (Early Version)
GREENSTAR™ System Connections (Late Version)
Using Monitor Mounts
Using Electric Rear View Mirrors (If Equipped)
Positioning Steps and Handrails
Using Secondary Hand Brake
Section : 30 - Break-In Period
Break-In Checks
Section : 35 - Operating Engine
Engine Fuel System and Power Rating
Starting the Engine
Cold Weather Starting-6.8 L Engine
Cold Weather Starting-8.1 L Engine (Without Starting Aid)
Cold Weather Starting-8.1L Engine (With Starting Aid)
Changing Starting Fluid Can (If Equipped-8.1 L Engine)
Operating the Engine
Stopping the Engine
Restarting Engine That Has Run Out Of Fuel
Using Auxiliary Heaters
Using a Booster Battery or Charger
Section : 40 - Operating Tractor
Avoid Contact with Pesticides
Cleaning Tractor of Hazardous Pesticides
Using Emergency Exit
Using Seat Belts
Transmission-Hydraulic System Warm-Up-Lever Operated SCV
Transmission-Hydraulic System Warm-Up-TOUCHSET™ Controls
Using Field Cruise Control
AutoTrac Assisted Steering System (If Equipped)
Using Mechanical Front-Wheel Drive (MFWD) (If Equipped)
Using Differential Lock
Using The Brakes
Triple Link Suspension (TLS II) (If Equipped)
Using Hydraulic Trailer Brakes (If Equipped)
Using Single or Dual Line Trailer Air Brakes (If Equipped)
Operating Electrohydraulic Multi-Function Control Lever (If Equipped)
Section : 41 - Operating PQ+ or AQ+ Transmission
Transmission Controls
Operating the Transmission
Transmission Description and Operations
Using Left-Hand Reverser
Using Enabling Mode (Come Home)
Section : 42 - Operating AutoPowr Transmission
Controls Identification
Transmission Description
Lever Positions-Left-Hand Reverser
Operating the Transmission
Adjusting Set Speeds (Tractor Stationary)
Adjusting Set Speeds to Match Varying Load Conditions
Set Speeds-Guidelines and Examples
Adjusting Reverse-Forward Set Speed Ratio
Putting Tractor in Motion
Corner Post and CommandCenter Displays
Using Creeper Mode
Using Individual Brake Pedals
Stopping and Parking the Tractor
AutoPowr Selector Guidelines
AutoPowr Selector Examples
Setting AutoPowr Options
Downhill Operation in Slippery Conditions
Using Enabling Mode (Come Home)
Section : 45 - Implement Management System (IMS)
Implement Management System (IMS)-Description and Display
Implement Management System (IMS)-Learned Functions
IMS Functions-Hitch
IMS Functions-AutoPowr Transmission
IMS Functions-Shifting PowrQuad-Plus (PQ+) and AutoQuad-Plus (AQ+) Transmissions
IMS Functions-Auto Shift and Economy Mode (AutoQuad-Plus [AQ+] Only)
IMS Functions-Auto Shift Resume (AutoQuad (AQ+) Only)
IMS Functions-Selective Control Valves (SCV with CommandArm/TouchSet Controls Only)
IMS Functions-MFWD
IMS Functions- Rear or Front PTO
IMS Functions-Differential Lock
Operating Implement Management System (IMS)
Aborting IMS
Clearing IMS Sequence
Section : 50 - Hitch
Identifying Hitch Related Controls and Switches
Hitch Set-up and Use (Quick Reference)
Using Hitch Lever/Display-Setting Depth and Lock/Damping
Setting Hitch Height Limit
Adjusting Hitch Rate-of-Drop
Adjusting Load/Depth Control (Draft Response)
Setting Hitch Slip Response
Using Float Operation
Using External Raise and Lower Switches
Using Hitch Manual Lowering
Hitch Components
Using Sway Blocks (If Equipped)
Adjusting Stabilizer Bar (If Equipped)
Stabilizing System (If Equipped)
Adjusting Stabilizing Support (If Equipped)
Positioning Center Link
Adjusting Center Link
Positioning Lift Links
Adjusting Lift Links
Changing Lateral Float
Using Front Hitch (If Equipped)
Operating Wagon Hitch (If Equipped)
Operating Pick-Up Hitch (If Equipped)
Changing Pick-Up Hitch Hook (If Equipped)
Section : 55 - Hydraulic Connections
Connecting Hydraulic Hoses-Rear of Tractor
Disconnecting Hydraulic Hoses-Rear of Tractor
Connecting/Disconnecting Hydraulic Hoses-Mid-Mount Valve or Front of Tractor (If Equipped)
Hydraulic Motor Return and Case Drain Kits
Using Load-Sensing Hydraulic System (Power Beyond)
Examples Using Load-Sensing Hydraulic System (Power Beyond)
Using Implement Requiring Large Volumes of Oil
Section : 60 - Hydraulic System-Lever Operated SCVs
Hydraulic Valves
Adjusting Rate of Cylinder or Motor Operation
SCV Symbol Definitions
SCV Lever Detent Operation
Operating Loader Using SCV
Adjusting Detent Relief Setting
SCV Lever Lockout
SCV Lever-Neutral Position
SCV Lever-Extend Position
SCV Lever-Retract Position
SCV Lever-Float Position
Section : 61 - Hydraulic System-TouchSet™ Controls
Hydraulic Valves
TouchSet™ Controls and Displays
Attaching Implement and Control System
Detaching Implement
Determining Total Flow Demand
Adjusting SCV Flow Rate
Adjusting Timed Detent
Using SCV Control Levers
SCV Lever-Neutral Position
SCV Lever-Extend Position
SCV Lever-Extend Detent Position
SCV Lever-Retract Position
SCV Lever-Retract Detent Position
SCV Lever-Float Position
Using Electrohydraulic Implement Depth Control (EHDC) (If Equipped)
Checking Electrohydraulic Implement Depth Control (EHDC) (If Equipped)
Section : 65 - Drawbar and PTO
Drawbar Load Limits Based on Drawbar Position, Length and PTO Type
Adjusting Drawbar Length
Adjusting Drawbar Side-to-Side
Using Clevis Assembly Cat 2 Drawbar
Installing and Using Clevis Assembly Cat 3 Drawbar
Attaching PTO-Driven Implement
Using Rear PTO Shield-Type 1 and 2 PTO
Using Rear PTO Shield-Type 3 PTO
Operating Front or Rear PTO
Using External Rear PTO Switch (If Equipped)
Operating Shiftable 3-Speed Rear PTO (If Equipped-7720 and 7820)
Reversible Rear PTO Mode Lever Position (If Equipped)
Using Correct Engine Speed
Using Correct PTO Shaft (7920)
Changing Reversible PTO Stub Shaft-Standard
Changing Reversible PTO Stub Shaft-Type 3, 2-Speed (7920)
Section : 70 - Performance Ballasting
Ballasting Information and Guidelines for Tractors with Single Tires
General Guidelines for Tractor Weight Based on Engine Horsepower
General Weight Split Guidelines
Ballast Types
Ballasting Suggestions for Specific Types of Implements used with MFWD Tractors
Determining Ballasted Tractor Weight, Weight Split, Axle Loads and Required Tire Inflation Pressures
Controlling Power Hop (MFWD tractors without front suspension)
Unballasted Tractor Weight Charts
Maximum Load Per Wheel
Installing QUIK-TATCH Weights
Using Rear Wheel Weights
Using Implement Codes
Implement Codes
Adding Rear Ballast For Front Loader
Using Liquid Ballast
Liquid Ballast Charts
Measuring Wheel Slip (Manually)
Section : 75 - Wheels, Tires and Treads
Tire Combinations
Tire Inflation Pressure Guidelines
Recommended Pressures-Group 42
Recommended Pressures-Group 43
Recommended Pressures-Group 47
Recommended Pressures-Group 47 (Continued)
Recommended Pressures-Group 48
Tightening Front Wheel Bolts-MFWD
Checking Toe-In-MFWD And TLS Axle
Adjusting Toe-In-MFWD And TLS Axle
Setting Steering Stop Positions (MFWD And TLS)
Eight Position MFWD Wheel Settings
MFWD Fender Settings-Deluxe Pivoting Fenders (Early Version Bracket)
MFWD Fender Settings-Deluxe Pivoting Fenders (Late Version Bracket)
MFWD or TLS Fender and Steering Stop Settings
Installing Rear Drive Wheel To Cast Hub
Installing Rear Steel Wheel to Dual Hub
Adjusting and Tightening Rear Steel Wheels-Standard Cast Hubs
Adjusting and Tightening Rear Wheels-Heavy Duty Cast Hubs
Rear Wheel, Tire and Tread Guidelines
Rear Drive Wheel Tread Settings for Single Wheels
Clamp-on Dual Usage
Section : 80 - Transporting
Driving Tractor on Roads
Transporting with Ballast
Towing Loads
Using a Safety Chain
Towing Tractor
Releasing Park Brake (AutoPowr Transmission)
Freeing a Mired Machine
Transporting on Carrier
Section : 85 - Fuel, Lubricants and Coolant
Diesel Fuel
Handling and Storing Diesel Fuel
Filling Fuel Tank
Bio-Diesel Fuel
Diesel Engine Break-In Oil
Diesel Engine Oil
Extended Diesel Engine Oil Service Intervals
Oil Filters
Diesel Engine Coolant
Operating in Warm Temperature Climates
Additional Information About Diesel Engine Coolants and Supplemental Coolant Additives
Testing Diesel Engine Coolant
Transmission and Hydraulic Oil
Transmission Recalibration
MFWD Axle Housing and Wheel Hub Oil
Grease
Mixing of Lubricants
Alternative and Synthetic Lubricants
Lubricant Storage
Section : 90 - Maintenance and Service Intervals
Observe Service Intervals
Service Interval Chart-Daily or 10 Hours/250 Hours/750 Hours
Service Interval Chart-1500 Hours/2000 Hours/Annual/5000 Hours or Five Years
Raising Hood
Removing Engine Side Shield(s)
Accessing Batteries
Using High-Pressure Washers
Using Compressed Air
Section : 95 - General Maintenance and Inspection
Inspecting Tires
Checking Neutral Start System-PowrQuad-Plus and AutoQuad-Plus Transmission
Checking Neutral Start System-AutoPowr Transmission
Checking Transmission PARK Position
Checking Brakes
Checking Secondary Brake
Servicing Engine Air Intake and Pre-Cleaner
Replacing Primary and Secondary Engine Air Filters
Checking and Replacing Cab Air Filters
Cleaning Engine Compartment
Cleaning Radiator and Oil Cooler/Condenser
Inspecting Fan Belt Tensioner
Replacing Fan Belt
Inspecting Seat Belts
Replacing Engine Crankshaft Damper
Inspecting Tractor for Loose Bolts
Bleeding Trailer Hydraulic Brakes (If Equipped)
Draining Trailer Air Brake Air Tank (If Equipped)
Section : 100 - Lubrication
Checking Engine Oil Level-6.8 L Engine
Checking Engine Oil Level-8.1 L Engine
Changing Engine Oil and Filter-6.8 L Engine
Changing Engine Oil and Filter-8.1 L Engine
Checking Transmission-Hydraulic Oil Level
Changing Transmission-Hydraulic Oil and Cleaning Suction Screen
Replacing Transmission Filter
Replacing Hydraulic Oil Filter
Checking MFWD Wheel Hub Oil Level
Changing MFWD Hub Oil
Checking MFWD Axle Housing Oil Level
Changing MFWD Axle Housing Oil
Lubricating MFWD Axle
Lubricating Triple Link Suspension (TLS II) (If Equipped)
Lubricating Rear Axle Bearings
Lubricating Hitch Components
Lubricating Wagon Hitch
Lubricating Draft Link Support Shaft Bushing
Checking Front PTO Housing Oil Level (If Equipped)
Changing Front PTO Housing Oil (If Equipped)
Lubricating Front PTO Shaft (If Equipped)
Lubricating Front Hitch (If Equipped)
Section : 105 - Maintenance-Cooling System
Checking Coolant Level (Coolant Recovery Tank)
Testing Coolant
Draining, Flushing and Refilling Cooling System
Section : 106 - Maintenance-Fuel System
Do Not Modify Fuel System
Do Not Open High-Pressure Fuel System
Draining Water Separator
Draining Water from Fuel Filter (6.8 L Engine)
Replacing Water Separator Filter (6.8 L Engine)
Replacing Fuel Filter-6.8 L Engine
Replacing Fuel Filter - 8.1 L Engine
Bleeding Fuel System-6.8 L Engine
Bleeding Fuel System-8.1 L Engine
Cleaning Fuel Tank Vent Filter
Draining Fuel Tank Sump
Section : 107 - Maintenance-Electrical System
Accessing Fuses and Relays
Load Center Fuses and Relays
Lights, Wipers and A/C Relay Panel
Handling Halogen Light Bulbs Safely
Replacing Front Grille Floodlight Element
High Intensity Discharge (HID) Lights-If Equipped
Replacing Headlight Element
Adjusting Headlights and Front Grille Work Lights
Replacing Front Belt-Line, Cab Roof (Rear and Side) or Rear Fender Floodlight Element
Replacing Front Hazard Light Bulbs
Replacing Tail Light Bulbs
Replacing License Lamp Bulb
Replacing Instrument and Display Illumination Light Bulb
Replacing Dome Light Bulb
Section : 110 - Troubleshooting
Engine Troubleshooting
Transmission Troubleshooting
Hydraulic System Troubleshooting
Brakes Troubleshooting
Hitch Troubleshooting
Selective Control Valve (SCV) Troubleshooting
TouchSet Depth Control Troubleshooting
Electrical System Troubleshooting
Operator Enclosure Troubleshooting
Tractor Operation Troubleshooting
Section : 112 - Service Codes
Service Codes
Section : 115 - Storage
Placing Tractor In Long-Term Storage
Removing Tractor From Storage
Paint Finish Care
Section : 120 - Specifications
Specifications
Overall Dimensions
Ground Speeds-40K (20-Speed) PowrQuad-Plus and AutoQuad-Plus
Ground Speeds-50K (20-Speed) AutoQuad-Plus
Ground Speeds-AutoPowr
Metric Bolt and Screw Torque Values
Unified Inch Bolt and Screw Torque Values
Declaration of Conformity
Section : 125 - Identification Numbers
Identification Numbers
Tractor Identification Number
Engine Serial Number
Cab Serial Number
Differential Case Serial Number
MFWD Axle Serial Number
Front Hitch Serial Number (If Equipped)
Keep Machines Secure
Keep Proof of Ownership
Section : 130 - Lubrication and Maintenance Records
250 Hour Service Record
500 Hour Service Record
750 Hour Service Record
1500 Hour Service Record
2000 Hour Service Record
Annual Service Record
5000 Hour or Five Year Service Record
Section : 135 - Glossary
Glossary of Terms
John Deere Parts
The Right Tools
Well-Trained Technicians
Prompt Service