Technical Manual Hitachi ZX27U-3, ZX27U-3F, ZX30U-3, ZX30U-3F, ZX35U-3, ZX35U-3F Excavator | T1ND-E-00

Technical Manual Hitachi ZX27U-3, ZX27U-3F, ZX30U-3, ZX30U-3F, ZX35U-3, ZX35U-3F Excavator T1ND-E-00 (Preview)

COVER
INTRODUCTION
SAFETY
SECTION AND GROUP CONTENTS
SECTION 1 GENERAL
Group 1 Specifications
Specifications
Working Ranges
Group 2 Component Layout
Main Component Layout
Electrical Component Layout (Overview)
Electrical System (Controllers and Relays)
Electrical System (Monitor and Switches)
Engine
Swing Device
Control Valve
Travel Device
2-Spool Solenoid Valve
Torque Control Solenoid Valve (Only Cab Spec. Machine), Flow Rate Selector Solenoid Valve (Optional)
Group 3 Component Specifications
Engine
Engine Accessories
Hydraulic Component
Filter
Electrical Component
Air Conditioner (Only Cab Specification)
SECTION 2 SYSTEM
Group 1 Control System
Outline
Engine Control (Only ZX30U-3 Class / 35U-3 Class)
Pump Control
Front Attachment Control (Only ZX30U-3 Class / 35U-3 Class)
Other Control
Group 2 Hydraulic System
Outline
Pilot Circuit
Main Circuit
Group 3 Electrical System
Outline
Electric Power Circuit (Key Switch : OFF)
Electric Power Circuit (Key Switch : ON)
Preheating Circuit (Key Switch : HEAT)
Starting Circuit (Key Switch : START)
Charging Circuit (Key Switch : ON)
Engine Stop Circuit (Key Switch : OFF)
SECTION 3 COMPONENT OPERATION
Group 1 Pump Device
Outline
Main Pump (P1, P2)
Main Pump (P3), Pilot Pump (P4)
Horse Power Control Operation
Group 2 Swing Device
Outline
Swing Motor
Parking Brake
Valve Unit
Swing Reduction Gear
Group 3 Control Valve
Outline
Hydraulic Circuit
Arm Regenerative Valve
Boom Anti-Drift Valve (Only ZX30U-3 Class / 35U-3 Class)
Flow Combiner Valve
Flow Rate Combining Selector Valve (Only ZX30U-3 Class / 35U-3 Class)
Main Relief Valve
Overload Relief Valve
Make-Up Valve
Group 4 Pilot Valve
Outline
Operation
Shockless Function (Only for Travel Pilot Valve)
Shuttle Valve (Optional)
Group 5 Travel Device
Outline
Travel Motor
Parking Brake
Travel Brake Valve
Travel Reduction Gear
Group 6 Others (Upperstructure)
2-Spool Solenoid Valve
Pilot Relief Valve
Torque Control Solenoid Valve (Only Cab Spec. Machine),Flow Rate Selector Solenoid Valve (Optional)
Multifunction Solenoid Valve (Optional)
Group 7 Others (Undercarriage)
Swing Bearing
Center Joint
Track Adjuster
SECTION 4 OPERATIONAL PERFORMANCE TEST
Group 1 Introduction
Operational Performance Test
Preparation for Performance Tests
Group 2 Standard
Operational Performance Standard
Main Pump P-Q Diagram (ZX27U-3 Class)
Main Pump P-Q Diagram (ZX30U-3 Class / 35U-3 Class)
Group 3 Engine Test
Engine Speed
Engine Compression Pressure
Valve Clearance
Nozzle Check
Group 4 Excavator Test
Travel Speed
Track Revolution Speed
Mistrack Check
Travel Motor Leakage
Swing Speed
Swing Function Drift Check
Swing Motor Leakage
Maximum Swingable Slant Angle
Swing Bearing Play
Hydraulic Cylinder Cycle Time
Dig Function Drift
Control Lever Operating Force
Control Lever Stroke
Combined Boom Raise/Swing Function Check
Group 5 Component Test
Primary Pilot Pressure
Secondary Pilot Pressure
Main Relief Valve Set Pressure
Overload Relief Valve Set Pressure
Pump Driving Torque
Swing Motor Drainage
Travel Motor Drainage
Group 6 Adjustment
Fuel Lever Adjustment (Only ZX27U-3 Class)
Governor Adjustment (Only ZX30U-3 Class / 35U-3 Class)
SECTION 5 TROUBLESHOOTING
Group 1 Diagnosing Procedure
Introduction
Diagnosing Procedure
Group 2 Troubleshooting A
Troubleshooting A Procedure (Only ZX30U-3 Class / 35U-3 Class)
Error Indication List
Wire Breakage and Short Circuit of Engine Control Dial (System FailureIndicator: Flickering Every 1 Sec.)
Motor Sensor Breakage and Short Circuit(System Failure Indicator: FlickeringEvery 0.5 Sec.)
Abnormal Motor (System Failure Indicator: Lit)
Group 3 Troubleshooting B
Troubleshooting B Procedure (Diagnosis of Machine by Symptom
Engine System Troubleshooting
Actuator Operating System Troubleshooting
Front Attachment System Troubleshooting
Swing System Troubleshooting
Travel System Troubleshooting
Blade System Troubleshooting
Boom Swing System Troubleshooting
Air Conditioner System Troubleshooting (Only Cab Spec.)
Work After Replacing Components
Charge Air Conditioner with Refrigerant
Purging Procedure
Warm-Up Operation
Inspection
How to Lower Boom when Engine Stops
Group 4 Troubleshooting C
Troubleshooting C Procedure (Diagnosis of Monitor)
Malfunction of Coolant Temperature Gauge
Malfunction of Fuel Gauge
Malfunction of Preheat Indicator
Malfunction of Alternator Indicator
Malfunction of Engine Oil Pressure Indicator
Malfunction of Overheat Indicator
Malfunction of Fuel Level Indicator
Malfunction of Monitor Buzzer
Malfunction of Liquid Crystal Display (LCD) (Only ZX30U-3 Class / 35U-3 Class)
Malfunction of Hour Meter
Malfunction of Auto-Idle Indicator (Only ZX30U-3 Class / 35U-3 Class)
Group 5 Electrical System Inspection
Precautions for Inspection and Maintenance
Fuse Continuity Test
Battery Voltage Check
Voltage Check
Continuity Check
SERVICE MANUAL REVISION REQUEST FORM
THE ATTACHED DIAGRAM LIST