John Deere 450J, 550J, 650J Crawler Dozer Operation and Test Technical Manual (S.N. 159987— )

TABLE OF CONTENTS

Contents
General Information
Safety Information
General Specifications
Torque Values
Fuels And Lubricants
Operational Checkout Procedure
Engine
Electrical System
System Information
I Electrical System
Visual Inspection
Electrical Circuit
a Malfunctions
Circuit Malfunction
High Resistance
Open Circuit
Grounded Circuit
Circuit Shorted
Sensor Circuit Shorted to Power
Sensor Circuit Shorted to Itself

Using Test Equipment
Multimeter
Seven Step Electrical Test Procedure
Schematic, Wiring Diagram, and Component Location Information
Reading a System Functional Schematic
Reading a Wiring Diagram
Reading a Component Location Diagram
Reading a Connector End View Diagram
Electrical Schematic Symbols
System Diagrams
Fuse Block
Color Codes
Fuse Specifications
Component Identification Table
Functional Schematic and Component Location
Legend
System Functional Schematic
Legend
System Functional Schematic
Loader Frame Harness (Without Tool Carrier) (W2)

Hydraulic System
Theory of Operation
Loader Hydraulic System
Hydraulic Pump
Hydraulic Pump Control
Hydraulic Pump Control—Neutral
Hydraulic Pump Control—Function Metering
Hydraulic Pump Control Full Flow
Hydraulic Pump Control—Function Bottomed
Steering System Components
Steering Valve Operation
Secondary Steering System Operation
Secondary Steering Inlet Manifold Operation
Pressure Reducing Valve
Boom Raise Operation
Boom Down—Engine Running Operation
Boom Down—Engine Off Operation
Boom Raise Operation
Boom Down—Engine Running Operation
Boom Down—Enaine Off Ooeration