John Deere 4990 Self-Propelled Windower Technical Manual TM1820 01FEB03

Table of contents
FOREWORD
SERVICE TECHNICIAN RESPONSE
Section 210 – SAFETY INFORMATION
Group 05 – Safety
Section 220 – ENGINE
Group 10 – Diagnostic Information
Section 230 – FUEL/AIR SYSTEMS
Group 10 – Diagnostic Information
Section 240 – ELECTRICAL SYSTEM DIAGNOSIS AND TEST (SERIAL NO. -163100)
Group 05 – Theory of Operation
Group 10 – System Information
Group 15 – Electrical Diagrams
Group 20 – Diagnosing Electrical System Malfunctions
Group 25 – Power Supply Circuits Tests
Group 30 – Starting System Tests
Group 35 – Charging System Tests (120 Amp)
Group 40 – Ground Speed Control System Diagnostics
Group 45 – Lighting System Tests
Group 50 – Platform Control Systems Tests
Group 55 – Machine Monitor System Tests
Group 60 – Fuel Control Tests
Group 65 – Heating and Air Conditioning Tests
Group 70 – Cab Accessories Circuits Tests
Group 75 – Air Seat Systems Tests
Group 80 – Miscellaneous Tests
Section 241 – ELECTRICAL SYSTEM DIAGNOSIS AND TEST (SERIAL NUMBER 163101 – )
Group 05 – How To Use This Diagnostic Information
Group 10 – Test And Adjustments
Group 15A – Air Condition and Heat Diagnostics
Group 15B – Armrest – Float Pressure Diagnostics
Group 15C – Armrest – Field/Road Shift (Running Lights) Diagnostics
Group 15D – Armrest – Platform Engage Diagnostics
Group 15E – Armrest – Throttle Control Diagnostics
Group 15F – Auxiliary Power Diagnostics
Group 15G – Charging Diagnostics
Group 15H – COMFORT COMMAND COMFORT COMMAND is a trademark of Deere & Company Seat
Diagnostics
Group 15I – Gauges – Engine Temperature and Fuel Level Diagnostics
Group 15J – Horn Diagnostics
Group 15K – Hydro Handle – Raise/Lower Diagnostics
Group 15L – Hydro Handle – Reel/Platform Speed Diagnostic
Group 15M – Hydro Handle – Platform Tilt Diagnostics
Group 15N – Lighting System – Dome and Console Light Diagnostics
Group 15O – Lighting System – Field Lights Diagnostics
Group 15P – Lighting System – Hazard Lights Diagnostics
Group 15Q – Lighting System – Overall Diagnostic
Group 15R – Lighting System – Road/Running Lights Diagnostics
Group 15S – Lighting System – Turn Signal Diagnostics
Group 15T – Lighting System – Work Lights Diagnostics
Group 15U – Park Brake Diagnostics
Group 15V – Power Distribution Diagnostics
Group 15W – Radio Diagnostics
Group 15X – Rotating Wand Diagnostics
Group 15Y – Starting System Diagnostics
Group 15Z – Tachometer – Engine Speed and Hourmeter Diagnostics
Group 15AA – Tachometer – Float Pressure Diagnostics
Group 15AB – Tachometer – Ground Speed/Park Brake Diagnostics
Group 15AC – Tachometer – Overall Diagnostics
Group 15AD – Tachometer – Platform Speed and Hourmeter Diagnostics
Group 15AE – Warning Display Panel – Alternator Diagnostics
Group 15AF – Warning Display Panel – Engine Air Filter Diagnostics
Group 15AG – Warning Display Panel – Engine Oil Pressure Diagnostics
Group 15AH – Warning Display Panel – Engine Temperature Diagnostics
Group 15AI – Warning Display Panel – Float Pressure Warning Diagnostics
Group 15AJ – Warning Display Panel – Hydraulic Oil Filter Diagnostics
Group 15AK – Warning Display Panel – Hydrostatic Charge Pressure Low Diagnostics
Group 15AL – Warning Display Panel – Hydrostatic Oil Temperature Diagnostics
Group 15AM – Warning Display Panel – Low Fuel Diagnostics
Group 15AN – Warning Display Panel – Operator Presence
Group 15AO – Warning Display Panel – Overall Diagnostics
Group 15AP – Warning Display Panel – Park Brake Diagnostics
Group 15AQ – Warning Display Panel – Road Shift Engage Light Diagnostics
Group 15AR – Wiper Diagnostics
Group 20 – Connector Information (end views, numbers, location photos)
Section 250 – POWER TRAIN DIAGNOSIS AND TEST
Group 05 – General Information
Group 10 – Tests and Adjustments
Group 15A – Power Train Diagnostics
Group 15B – Range Shift Diagnostics
Group 15C – Steering and Brake Release Diagnostics
Group 15D – Final Drive Diagnostics
Group 20 – Component Location
Section 260 – STEERING AND BRAKES DIAGNOSIS AND TEST
Group 05 – General
Group 10 – Tests and Adjustments
Group 15A – Steering System/Ground Speed Diagnostics
Group 15B – Park Brake Diagnostics
Section 270 – HYDRAULIC SYSTEM DIAGNOSIS AND TEST
Group 05 – General Information
Group 10 – Tests and Adjustments
Group 15A – General Hydraulic System Diagnostics
Group 15B – Priority Valve Diagnostics
Group 15C – Open Center Circuit Diagnostics
Group 15D – Platform Raise/Lower Diagnostics
Group 15E – Platform Tilt Diagnostics
Group 15F – Platform Float System Diagnostics
Group 15G – Platform Drive Diagnostics
Group 15H – Auxiliary-Charge Pump Diagnostics
Group 20 – Component Location
Section 290 – OPERATOR STATION (SERIAL NO. -163100)
Group 00 – General Information
Group 05 – System Operational Checks
Group 10 – Tests and Adjustments
Group 15 – Diagnostics
Group 20 – Adjustments
Group 25 – Theory of Operation
Section 291 – OPERATOR STATION DIAGNOSIS AND TEST (SERIAL NO. 163101-)
Group 05 – Air Conditioning General Information
Group 10 – Tests and Adjustments
Group 15 – Air Conditioning and Heater Diagnostics
Group 20 – Component Location