Illustrated Factory Diagnosis and Tests Service Manual for John Deere Self-Propelled Hay and Forage Windrowers Models 4990 This manual contains high quality images, circuit diagrams, diagnostic procedures to help you to diagnostic, troubleshoot and repair your truck. This document is printable, without restrictions, contains searchable text, bookmarks, crosslinks for easy navigation. This is Diagnostic manual, including electrical and hydraulic wiring diagrams, Repair manual are sold separate. Language: English Format: PDF, 1306 pages Covered models:   4990 Contents:    Engine    Fuel/Air Systems    Electrical System Diagnosis and Test (Serial No. -163100)       Electrical Diagrams       Diagnosing Electrical System Malfunctions       Power Supply Circuits Tests       Starting System Tests       Charging System Tests (120 Amp)       Ground Speed Control System Diagnostics       Lighting System Tests       Platform Control Systems Tests       Machine Monitor System Tests       Fuel Control Tests       Heating and Air Conditioning Tests       Cab Accessories Circuits Tests       Air Seat Systems Tests       Miscellaneous Tests    Electrical System Diagnosis and Test (Serial Number 163101 - )       How To Use This Diagnostic Information       Test And Adjustments       Air Condition and Heat Diagnostics       Armrest - Float Pressure Diagnostics       Armrest - Field/Road Shift (Running Lights) Diagnostics       Armrest - Platform Engage Diagnostics       Armrest - Throttle Control Diagnostics       Auxiliary Power Diagnostics       Charging Diagnostics       COMFORT COMMAND Seat Diagnostics       Gauges - Engine Temperature and Fuel Level Diagnostics       Horn Diagnostics       Hydro Handle Diagnostics       Lighting System Diagnostics       Park Brake Diagnostics       Power Distribution Diagnostics       Radio Diagnostics       Rotating Wand Diagnostics       Starting System Diagnostics       Tachometer - Engine Speed and Hourmeter Diagnostics       Tachometer - Float Pressure Diagnostics       Tachometer - Ground Speed/Park Brake Diagnostics       Tachometer - Overall Diagnostics       Tachometer - Platform Speed and Hourmeter Diagnostics       Warning Display Panel       - Alternator Diagnostics        - Engine Air Filter Diagnostics        - Engine Oil Pressure Diagnostics        - Engine Temperature Diagnostics        - Float Pressure Warning Diagnostics        - Hydraulic Oil Filter Diagnostics        - Hydrostatic Charge Pressure Low Diagnostics        - Hydrostatic Oil Temperature Diagnostics        - Low Fuel Diagnostics        - Operator Presence        - Overall Diagnostics        - Park Brake Diagnostics        - Road Shift Engage Light Diagnostics       Wiper Diagnostics       Connector Information (end views, numbers, location photos)    Power Train Diagnosis and Test    Steering and Brakes Diagnosis and Test    Hydraulic System Diagnosis and Test       General Information       Tests and Adjustments       General Hydraulic System Diagnostics       Priority Valve Diagnostics       Open Center Circuit Diagnostics       Platform Raise/Lower Diagnostics       Platform Tilt Diagnostics       Platform Float System Diagnostics       Platform Drive Diagnostics       Auxiliary-Charge Pump Diagnostics       Component Location    Operator Station