Technical Manual Hitachi ZX300LC-7, ZX300LCN-7 Hydraulic Excavator | TODD650-EN-00

Technical Manual Hitachi ZX300LC-7, ZX300LCN-7 Hydraulic Excavator TODD650-EN-00 (Preview)

TODD650-EN-00
INTRODUCTION
To The Reader
Additional References
Manual Composition
Page Number
Trademark
Safety Alert Symbol and Headline Notations
Units Used
SYMBOL AND ABBREVIATION
Symbol and Abbreviation
CONTRASTING LIST OF PART NAME
Contrasting List of Part Name between Technical Manual and Parts Catalog
SECTION AND GROUP CONTENTS
CONTENTS
GENERAL
Specifications
Specifications of ZX300LC-7, 300LCN-7
Specifications of ZX300LC-7, 300LCN-7 (2-Piece Boom)
Working Ranges of ZX300LC-7, 300LCN-7
Working Ranges of ZX300LC-7, 300LCN-7 (2-Piece Boom)
Component Layout
Main Component (Upperstructure)
Main Component (Undercarriage)
Main Component (Front Attachment)
Electrical System (Overview)
Electrical System (Rear Tray)
Electrical System (Switches)
Electrical System (Utility Space)
Electrical System (Relays)
Engine Oil Monitoring Sensor
Hydraulic Oil Monitoring Sensor
Engine
Aftertreatment Device
Pump Device
Around Pump Device
Control Valve
Signal Control Valve
Swing Device
Travel Device
5-Spool Solenoid Valve Unit
3-Spool Solenoid Valve Unit
2-Spool Solenoid Valve Unit (For Aftertreatment Device Regeneration Control)
DEF Tank
DEF Supply Module
Layout of Attachment Spec. Parts
Around Control Valve
Control Valve Lower Side
Utility Space
Component Specifications
Specifications of Engine
Specifications of Engine Accessories
Specifications of Hydraulic Component
Specifications of Electrical Component
SYSTEM
Controller
Outline of Controller
CAN Circuit
Control System
Outline of Control System
Engine Control
Engine Control System Layout
Engine Protection Control
Engine Control Dial Control
ECO Control
Power Mode (ECO/PWR Mode) Switch Control
ECO Mode Control
Travel HP Mode Control
Auto-Idle Control
Hydraulic Oil Temperature Auto Warming-Up Control
Radiator Coolant Temperature Auto Warming-Up Control
Idle Speed-Up Control
Idle Speed-Up Control (Pilot Shut-Off Lever)
Engine Speed Slow Down Control
Heater Control
One-Touch Idle Control
Attachment Operation Speed Increase Control (Option)
Attachment Operation Speed Limit Control (Option)
Pump Control
Pump Control System Layout
Speed Sensing Control
Swing Relief Cut Control
Pump Torque Decrease Control (Radiator Coolant Temperature)
Pump Torque Decrease Control (Hydraulic Oil Temperature)
Travel Torque-Up Control
Pump Torque Restriction Control (During Engine Output Restriction)
Pump 1 Flow Rate Control
Pump 2 Flow Rate Control
Pump 3 Flow Rate Control
Pump 1 Flow Rate Limit Control (Option)
Pump 2 Flow Rate Limit Control (Option)
Pump 3 Flow Rate Limit Control (Option)
Valve Control (Standard)
Valve Control (Standard) System Layout
Power Digging Control
Auto-Power Lift Control
Travel Motor Displacement Angle Control
Arm Regenerative Cut Control
Digging Regenerative Control
Arm 1 Flow Rate Control
Arm 2 Roll-In Pilot Cut Control
Aftertreatment Device Manual Regeneration Control
Aftertreatment Device Auto Regeneration Control
Pump 3 Center Bypass Shut-Out Control
Arm Roll-In Meter-Out Open Control
Valve Control (Option)
Valve Control (Option) System Layout
Attachment Flow Rate Control
Auxiliary Flow Combiner Control
Breaker 1 (HSB Breaker) Control
Auxiliary Overload Relief Valve Pressure Control
Pump/Valve Coordination Control
Pump/Valve Coordination Control System Layout
Pump 3 Minimum Displacement Angle Hold Control during Digging Operation
Other Control
Work Mode Control
Auto Shut-Down Control
Automatic Engine Stop Control at Low Temperature
Hydraulic Oil Overheat Alarm Control
Breaker Alarm Control (Option)
Travel Alarm Control (Option)
Swing Alarm Control (Option)
Overload Alarm Control (Option)
Engine System
Outline of ECM System
Fuel Injection Control
Fuel Injection Amount Control
Fuel Injection Timing Control
Fuel Injection Rate Control
Fuel Injection Pressure Control
Fuel Injection Amount Correction Control
EGR Control
Preheating Control
Variable Turbocharger Control
Alarm Control
Urea SCR System
DEF Injection Control
Start-Up Control
DEF Defrosting Control(DEF Tank)
DEF Defrosting Control(DEF Piping)
DEF Thermal Control(DEF Tank)
DEF Thermal Control(DEF Piping)
After-Run Control
Engine Output Restriction Control (INDUCEMENT)
Insufficient DEF Level
Malfunction of Urea SCR System/Malfunction of EGR System
Outline of Aftertreatment Device
Operation of Aftertreatment Device
Aftertreatment Device Regeneration Control
Hydraulic System
Outline of Hydraulic System
Pilot Circuit of Hydraulic System
Operation Control Circuit
Pump Control Circuit (Refer to COMPONENT OPERATION/Pump Device.)
Aftertreatment Device Regeneration Control Circuit (Refer to SYSTEM/Control System.)
Valve Control Circuit (Refer to COMPONENT OPERATION/Control Valve, Travel Device.)
Travel Motor Displacement Angle Control Circuit (Refer to COMPONENT OPERATION/Travel Device.)
Swing Parking Brake Release Circuit (Refer to COMPONENT OPERATION/Swing Device.)
Main Circuit of Hydraulic System
Neutral Circuit
Flow Combiner Circuit (Front Attachment)
Relief Circuit
Combined Operation Circuit
Flow Combiner Circuit
Digging Regenerative Circuit
Arm Regenerative Cut Circuit
Arm 1 Flow Rate Control Circuit
Arm 2 Roll-In Pilot Cut Control Circuit
Pump 3 Center Bypass Shut-Out Control Circuit
Arm Roll-In Meter-Out Open Control Circuit
Bucket Regenerative Cut Circuit
Boom Lower Meter-In Cut Control
Boom Cylinder Bottom Pressure: High (With the Front Attachment above the Ground)
Boom Cylinder Bottom Pressure: Low (With the Track Raised off the Ground)
Pump 3 Minimum Displacement Angle Hold Control during Digging Operation Circuit
Breaker/Pulverizer/Crusher Circuit of Hydraulic System (Option)
Auxiliary Flow Combiner Circuit
When Performing Single Operation of Auxiliary Flow Combiner Circuit
When Performing Combined Operation of Auxiliary Flow Combiner Circuit
Breaker 1 (HSB Breaker) Circuit
Breaker 2 (NPK Breaker) Circuit
Electrical System
Outline of Electrical System
Main Circuit of Electrical System
Electric Power Circuit (Key Switch: OFF)
CAN Circuit
Accessory Circuit (Key Switch: ACC)
Starting Circuit (Key Switch: START)
Charging Circuit (Key Switch: ON)
Alternator Operation
Regulator Operation
Surge Voltage Prevention Circuit
Pilot Shut-Off Circuit (Key Switch: ON)
Auto Shut-Down Circuit/Automatic Engine Stop Circuit at Low Temperature
Engine Stop Circuit
Emergency Stop Circuit
Monitor Circuit of Electrical System
Security Circuit
Aerial Angle Circuit
Control Lever Automatic Pilot Shut-Off Circuit
Seat Belt Reminder Circuit
Radio Circuit
Air Conditioner Circuit
Accessory Circuit
Work Light Circuit (Work Light: ON)
Work Light Circuit (Work Light and Boom Light: ON)
Wiper Circuit
Washer Circuit
Cab Light Circuit (Cab Light Switch: Door Interlocking Position (Key Switch: ON))
Cab Light Circuit (Cab Light Switch: ON Position)
COMPONENT OPERATION
Pump Device
Outline of Pump Device
Outline of Main Pump
Operational Principle of Main Pump
Increasing and Decreasing of Main Pump Delivery Flow Rate
Outline of Regulator
Regulator Control Function
Control by Pump Control Pressure
Control by Own and Partner Pump Delivery Pressure (Regulators for Pump 1 and Pump 2)
Control by Own Pump Delivery Pressure (Pump 3 Regulator)
Control by Pilot Pressure from Torque Control Solenoid Valves
Control by Pilot Pressure from Maximum Pump Flow Rate Limit Control Solenoid Valves (Pump Flow Rate Limit Control)
Control by Pilot Pressure from Maximum Pump Flow Rate Limit Control Solenoid Valves (Pump Flow Rate Control)
Flow Rate Increase Control by Pump Control Pressure
Flow Rate Decrease Control by Pump Control Pressure
Flow Rate Decrease Control by Own and Partner Pump Delivery Pressure (Regulators for Pump 1 and Pump 2)
Flow Rate Increase Control by Own and Partner Pump Delivery Pressure (Regulators for Pump 1 and Pump 2)
Flow Rate Decrease Control by Own Pump Delivery Pressure (Pump 3 Regulator)
Flow Rate Increase Control by Own Pump Delivery Pressure (Pump 3 Regulator)
Flow Rate Decrease Control by Pilot Pressure from Torque Control Solenoid Valve
Flow Rate Control by Pilot Pressure from Maximum Pump Flow Rate Limit Control Solenoid Valves (Pumps 1, Pump 2, and Pump 3)
Outline of Maximum Flow Rate Limit Control Solenoid Valve and Torque Control Solenoid Valve
Operation of Maximum Flow Rate Limit Control Solenoid Valve and Torque Control Solenoid Valve
Outline of Pilot Pump
Outline of Pump Delivery Pressure Sensor
Outline of Pump Control Pressure Sensor
Swing Device
Outline of Swing Device
Outline of Swing Reduction Gear
Outline of Swing Motor
Outline of Swing Parking Brake
When Brake is Released of Swing Parking Brake
When Brake is Applied of Swing Parking Brake
Outline of Valve Unit
Operation of Make-Up Valve
Outline of Swing Relief Valve
Low-Pressure Relief Operation (Shockless Function) of Swing Relief Valve
High-Pressure Relief Operation (Overload Prevention) of Swing Relief Valve
Outline of Swing Dampener Valve
Operation of Swing Dampener Valve
Output Curve of Swing Dampener Valve: Between A and B (When Relieving)
Output Curve of Swing Dampener Valve: Operation of Combination Valve A between A and B (During Relief)
Output Curve of Swing Dampener Valve: Operation of Combination Valve B between A and B (During Relief)
Output Curve of Swing Dampener Valve: Between B and C (Pressure Begins to Decrease)
Output Curve of Swing Dampener Valve: Operation of Combination Valve A between B and C (Pressure Begins to Decrease)
Output Curve of Swing Dampener Valve: Between C and D (Port BM Pressure Decreases)
Output Curve of Swing Dampener Valve: Operation of Combination Valve B between C and D (Port BM Pressure Decreases)
Output Curve of Swing Dampener Valve: Between D and E (During Aftershock)
Output Curve of Swing Dampener Valve: Operation of Combination Valve A between D and E (During Aftershock)
Output Curve of Swing Dampener Valve: Operation of Combination Valve B between D and E (During Aftershock)
Control Valve
Outline of Control Valve
Components in Control Valve
Main Circuit of Control Valve
Pilot Operation Control Circuit of Control Valve
External Pilot Pressure Circuit of Control Valve
Operation of Flow Combiner Valve
Outline of Main Relief Valve
Relief Operation of Main Relief Valve
Pressure Increasing Operation of Main Relief Valve
Outline of Overload Relief Valve (With Make-Up Function)
Relief Operation of Overload Relief Valve
Make-Up Operation of Overload Relief Valve
Outline of Regenerative Valve
Operation of Boom Regenerative Valve
Outline of Bucket Regenerative Valve
Operation When Performing Bucket Regenerative Operation
Operation When Performing Bucket Regenerative Cut Operation
Operation When Performing Arm Regenerative Operation
Operation When Releasing Arm Regenerative Operation
Outline of Anti-Drift Valve
Holding Operation of Anti-Drift Valve
Releasing Operation of Anti-Drift Valve
Outline of Flow Rate Control Valve
Normal Operation of Flow Rate Control Valve
Flow Rate Control Operation of Flow Rate Control Valve
Outline of Arm Roll-In Meter-Out Open Control Spool
Operation of Arm Roll-In Meter-Out Open Control Spool
Outline of Digging Regenerative Valve
Operation of Digging Regenerative Valve
Outline of Boom Lower Meter-In Cut Valve
Operation of Boom Lower Meter-In Cut Valve (With the Track off the Ground)
Operation of Boom Lower Meter-In Cut Valve (With the Front Attachment above the Ground)
Outline of Auxiliary Flow Combiner Valve and Pump 1 Bypass Shut-Out Valve
Operation of Auxiliary Flow Combiner Valve and Pump 1 Bypass Shut-Out Valve (During Single Operation)
Operation of Auxiliary Flow Combiner Valve and Pump 1 Bypass Shut-Out Valve (During Combined Operation)
Outline of Pump 3 Bypass Shut-Out Valve
Operation of Pump 3 Bypass Shut-Out Valve
Pilot Valve
Outline of Pilot Valve
Outline of Front Attachment/Swing Pilot Valve
Outline of Travel Pilot Valve
Outline of Auxiliary 1 and Positioning/Auxiliary 2 Pilot Valves
Operation of Front Attachment/Swing and Travel Pilot Valves
When Front Attachment/Swing and Travel Pilot Valves are in Neutral (Output Curve: A to B)
During Metering or Decompressing of Front Attachment/Swing and Travel Pilot Valves (Output Curve: C to D)
Full Stroke of Front Attachment/Swing and Travel Pilot Valves (Output Curve: E to F)
Operation of Auxiliary 1 and Positioning/Auxiliary 2 Pilot Valves
When Auxiliary 1 and Positioning/Auxiliary 2 Pilot Valves are in Neutral (Output Curve: A to B)
During Metering or Decompressing of Auxiliary 1 and Positioning/Auxiliary 2 Pilot Valves (Output Curve: C to D)
Outline of Shockless Function (Only Travel Pilot Valve)
Operation of Shockless Function
Travel Device
Outline of Travel Device
Outline of Travel Reduction Gear
Outline of Travel Motor
Operation of Travel Motor
Outline of Parking Brake
Operation of Parking Brake (When Parking Brake is Released)
Operation of Parking Brake (When Parking Brake is Applied)
Outline of Travel Brake Valve
Operation of Counterbalance Valve (During Travel)
Operation of Counterbalance Valve (When Descending a Slope)
Outline of Travel Relief Valve
Operation of Travel Relief Valve (During Relief)
Operation of Travel Relief Valve (During Make-Up)
Outline of Travel Mode Control
Operation of Selecting Travel Mode (Slow Speed)
Operation of Selecting Travel Mode (Fast Speed)
Signal Control Valve
Outline of Signal Control Valve
Pilot Valve Side of Pilot Port
Control Valve Side of Pilot Port
Outline of Shuttle Valve
Outline of Shockless Valve
Operation of Shockless Valve (During Boom Raise Operation)
Operation of Shockless Valve (During Boom Lower Operation or When Stopping Boom Raise Operation (Shock Reducing Operation))
Operation of Pump 1 Flow Rate Control Valve, Pump 2 Flow Rate Control Valve, and Pump 3 Flow Rate Control Valve
Operation of Flow Combiner Valve Control Spool
Operation of Swing Parking Brake Release Spool
Others (Upperstructure)
Outline of Pilot Shut-Off Solenoid Valve
Pilot Shut-Off Lever: LOCK Position
Pilot Shut-Off Lever: UNLOCK Position
Outline of Solenoid Valve
Outline of 5-Spool Solenoid Valve Unit
Outline of 3-Spool Solenoid Valve Unit
Outline of 2-Spool Solenoid Valve Unit (For Aftertreatment Device Manual Regeneration Control)
Outline of Auxiliary Control Solenoid Valve Unit (Option)
Outline of Proportional Solenoid Valve
Operation of Proportional Solenoid Valve (When in Neutral)
Operation of Proportional Solenoid Valve (When Excited)
Outline of ON/OFF Solenoid Valve
Operation of ON/OFF Solenoid Valve (when in Neutral)
Operation of ON/OFF Solenoid Valve (When in Operation)
Outline of Hose Rupture Valve
Operation of Hose Rupture Valve (When Control Lever is in Neutral)
Operation of Hose Rupture Valve (During Boom Lower Operation (Control Lever Stroke: Less than Half-Stroke))
Operation of Hose Rupture Valve (During Boom Lower Operation (Control Lever Stroke: More than Half-Stroke))
Outline of Pilot Relief Valve
Outline of Recirculation Valve
Others (Undercarriage)
Outline of Swing Bearing
Outline of Center Joint
Outline of Track Adjuster (Front Idler Integrated Type)
SERVICE MANUAL REVISION REQUEST FORM