Technical Manual Hitachi ZW30, ZW40, ZW50 Wheel Loader | T4EK-E-01

Technical Manual Hitachi ZW30, ZW40, ZW50 Wheel Loader T4EK-E-01 (Preview)

T4EK-E-01
CONTENTS
INTRODUCTION
SAFETY
SECTION AND GROUPCONTENTS
SECTION 1 GENERAL
Group 1 Specification
SPECIFICATIONS
Group 2 Component Specification
ENGINE
HST PUMP
GEAR PUMP
ORBITROL
Group 3 Component Layout
MAIN COMPONENT (OVERVIEW)
MAIN COMPONENT (POWER LINE)
HYDRAULIC SYSTEM (OVERVIEW)
ELECTRICAL SYSTEM (OVERVIEW)
ELECTRICAL SYSTEM (METER PANEL)
ENGINE
HST PUMP
REDUCTION
CONTROL VALVE
SECTION 2 SYSTEM
Group 1 Fuel System
OUTLINE
Group 2 Hydraulic System
OUTLINE
HST CIRCUIT
HST OIL FILTER
BRAKE CIRCUIT
PARKING BRAKE CIRCUIT
STEERING CIRCUIT
MAIN HYDRAULIC CIRCUIT
Group 3 Electrical System
OUTLINE
ELECTRICAL CIRCUIT (FRONT SIDE)
ELECTRICAL CIRCUIT (REAR SIDE)
ELECTRICAL CIRCUIT (COUPLER POSITION)
FUSE VALUE AND CIRCUIT NAME
ELECTRICAL POWER CIRCUIT
PREHEAT CIRCUIT(KEY SWITCH: HEAT)
PREHEAT CIRCUIT(KEY SWITCH: START TO ON)
CHARGING CIRCUIT
STARTING CIRCUIT
ENGINE STOP CIRCUIT
MONITOR INDICATOR CIRCUIT
GAUGE CIRCUIT
TRAVEL CIRCUIT
TRAVEL CIRCUIT (FORWARD)
TRAVEL CIRCUIT (BACKWARD)
PARKING BRAKE CIRCUIT
LIGHT CIRCUIT
HORN CIRCUIT
AUTO LEVELER CIRCUIT
SECTION 3 COMPONENT OPERATION
Group 1 HST Pump
HST CIRCUIT
HST PUMP
HIGH-PRESSURE RELIEF VALVE
HST PUMP CHARACTERISTIC CURVE
DA CONTROL
DISPLACEMENT ANGLE RETURN FORCEAND ADVANCE
INCHING VALVE
AUTOMATIC TRANSMISSION FUNCTION
TORQUE CONTROL FUNCTION
Group 2 HST Motor
HST MOTOR
PILOT PRESSURE PROPORTIONALCONTROL (HD CONTROL)
CONSTANT PRESSURE CONTROL
HD CONTROL
Group 3 Axle
AXLE
DIFFERENTIAL ASSEMBLY
LIMITED SLIP DIFFERENTIAL (LSD)
FINAL DRIVE ASSEMBLY
Group 4 Brake
SERVICE BRAKE
PARKING BRAKE
TOWING MACHINE METHOD(IN EMERGENCY)
WET TYPE BRAKE ASSEMBLY INREDUCTION GEAR
MASTER CYLINDER
Group 5 Orbitrol
POWER STEERING (ORBITROL)
OPERATION IN NEUTRAL
RIGHT TURN OPERATION
RELIEF VALVE OPERATION
Group 6 Loading Control Valve
LOADING CONTROL VALVE
OPERATION
OPERATION OF TILT SPOOL
OPERATION OF LIFT SPOOL
DETENT OPERATION
RELIEF VALVE
ANTI-VOID VALVE
Group 7 Main Pump
MAIN PUMP
RETURN FILTER
SECTION 4 OPERATIONALPERFORMANCE TEST
Group 1 Introduction
OPERATIONAL PERFORMANCE TESTS
PREPARATION FOR PERFORMANCETESTS
Group 2 Standard
PERFORMANCE STANDARD
Group 3 Engine Test
ACT. ENG SPEED (Engine Speed)
ENGINE COMPRESSION PRESSURE
VALVE CLEARANCE
NOZZLE
Group 4 Wheel Loader Test
TRAVEL SPEED
SERVICE BRAKE CONTROL FUNCTION
PARKING BRAKE CONTROL FUNCTION
HYDRAULIC CYLINDER CYCLE TIME
HYDRAULIC CYLINDER NATURAL DRIFTCHECK
CONTROL LEVER OPERATING FORCE
CONTROL LEVER STROKE
MAIN RELIEF SET PRESSURE
STEERING RELIEF PRESSURE
DA CONTROL PRESSURE IN HST PUMP
LOW RELIEF PRESSURE IN HST PUMP
HIGH RELIEF PRESSURE IN HST PUMP
SECTION 5 TROUBLESHOOTING
Group 1 Diagnosing Procedure
INTRODUCTION
DIAGNOSING PROCEDURE
Group 2 Failure List
Trouble symptoms regarding the engine
Trouble symptoms regarding the vehicle performance
Group 3 Engine
Group 4 Vehicle Performance
Group 5 Air Conditioner
Air Conditioner
Tips for Optimal Air Conditioner Usage
Inspection and Maintenance Table
Inspection and Maintenance Procedures
Outline of Operation
Functional Description of Main Components
Troubleshooting
Disassembly/Assembly
SERVICE MANUAL REVISION REQUEST FORM
THE ATTACHED DIAGRAM LIST