Daewoo Doosan Solar 280LC-III Excavator Shop Manual 2023-7101E-1 – PDF DOWNLOAD
DESCRIPTION:
Daewoo Doosan Solar 280LC-III Excavator Shop Manual 2023-7101E-1 – PDF DOWNLOAD
2023-7101 E-1
Accessory Applications:
- The excavator has been primarily designed for moving earth with a bucket
- For use as a grapple or for other object handling, contact Daewoo. Liftingwork applications (unless restricted or prohibited by local regulations) are permitted in approved lift configuration, to rated capacity only, with no sideloading.
- DO NOT use the machine for activities for which it was not intended.
- DO NOT use the bucket for lifting work, unless lift slings are used in the approved configuration.
- Use of an accessory hydraulic hammer (breaker), work in rough terrain, demolition applications or other hazardous operation may require installation of additional protective structures to safeguard the operator.
- Refer to Page 3-3 for additional information on Falling Object Protective Structures (F.O.P.S.) and other reinforcement systems.
Lifting Capacity Rating Configuration:
- Lifting capacity ratings that are printed at the end of this safety section are based on the machine being level, on a firm supporting surface, with hooks and slings attached in approved configuration.
- Loads must be balanced and supported evenly.
- Use taglines to keep the load steady if wind conditions and large surface area are a problem.
- Work crew hand signals, individual tasks and safe procedures should all be universally understood before the lift is made.
NOTE:
- Before using the excavator to make lifts check municipal and regional regulations or statutes that could apply.
- Governing ordinances may require that all heavy lifting be done with single purpose equipment specifically designed for making lifts, or other local restrictions may apply.
- Making heavy lifts with a general purpose excavator that can be used for digging, loading, grading or other work may be expressly forbidden by a regional injunction or other legal prohibition.
- Always follow all of the other instructions, guidelines and restrictions for Safe Lifting in the Operation and Shop Manuals.
Locations of Safety Labels:
- Always keep these labels clean.
- If they loosen up or become unreadable reattach them securely or replace them with a new label.
- It is the responsibility of the equipment owner and crew to provide essential safety information in the immediate vicinity of hazards.
- Safety labels may be available in languages other than English, or labels providing a warning for other hazards than those that follow may be available.
- Contact your Daewoo distributor to find out what labels are available.
TABLE OF CONTENTS:
Daewoo Doosan Solar 280LC-III Excavator Shop Manual 2023-7101E-1 – PDF DOWNLOAD
SAFETY
To the Operator of a Daewoo Excavator ………………………………………… 1-1
General Safety Essentials …………………………………………………. 1-1
Locations of Safety Labels …………………………………………………. 1-2
Summary of Safety Precautions for Lifting in “Leveling Mode I” ………………………… 1-5
Operation ……………………………………………………………. 1-7
Equipment …………………………………………………………… 1-10
Maintenance …………………………………………………………. 1-11
Shipping and Transportation ………………………………………………. 1-12
Excavator Rated Lift Capacity Tables …………………………………………. 1-13
SPECIFICATIONS
Excavator Machinery Plan …………………………………………………. 2-1
Excavator Engine Specifications …………………………………………….. 2-2
Engine Performance Curves ……………………………………………….. 2-3
Hydraulic System Component Specifications …………………………………….. 2-4
Hydraulic Pump Performance Characteristics …………………………………….. 2-5
General Dimensions …………………………………………………….. 2-6
General Specifications ……………………………………………………. 2-7
Dimensions and Working Range …………………………………………….. 2-8
Load Weight, Bucket Size and Approved Arm Length Table …………………………… 2-9
Approximate Weight of Workload Materials …………………………………….. 2-1 O
Excavator Rated Lift Capacity Tables …………………………………………. 2-12
Summary of Safety Precautions for Lifting in “Leveling Mode I” ……………………….. 2-23
Performance Tests ……………………………………………………… 2-24
Excavator Performance Standards …………………………………………… 2-25
UPPER STRUCTURE
Operator’s Cab Removal Procedure …………………………………………… 3-1
Falling Object Protective Structures (F.O.P.S.) ……………………………………. 3-3
Front Attachment Pin Specifications …………………………………………… 3-4
Bucket Tooth Inspection and Replacement ………………………………………. 3-5
Shimming Bucket Linkage …………………………………………………. 3-6
Bucket Attachment, Removal and Reversal ……………………………………… 3-7
Removal and Installation of the Front Attachment …………………………………. 3-8
Attachment Cylinders, Disassembly and Reassembly ………………………………. 3-11
Cylinder Disassembly Special Tools ………………………………………….. 3-12
Operation of Hydraulic Cylinders ……………………………………………. 3-16
Cylinder Assembly and Disassembly …………………………………………. 3-17
Cylinder Reassembly ……………………………………………………. 3-21
Welding Precautions and Guidelines …………………………………………. 3-23
Accumulator …………………………………………………………. 3-24
Engine Components and Accessories ………………………………………… 3-26
Counterweight Removal and Installation ………………………………………. 3-27
Fuel Tank Removal and Installation ………………………………………….. 3-28
Engine Cooling System: Radiator/Oil Cooler ……………………………………. 3-29
280LC-III Shop Manual – Revision 1
Swing Bearing Maintenance ………………………………………………. 3-32
Center Joint (Swivel) Overhaul/Repair ………………………………………… 3-33
Hydraulic System General Notes ……………………………………………. 3-37
Operation of Working Components ………………………………………….. 3-39
Main Pump Assembly Description …………………………………………… 3-43
Pump Regulator Description ………………………………………………. 3-46
Hydraulic System General Precautions ……………………………………….. 3-51
Maintenance Service and Repair Procedure ……………………………………. 3-52
Troubleshooting – Main Pump ……………………………………………… 3-52
Main Pump Parts List …………………………………………………… 3-53
Main Pump Disassembly and Reassembly ……………………………………… 3-54
Reassembly of Main Pumps and Valve Block ……………………………………. 3-57
Pump Regulator Parts List ………………………………………………… 3-60
Pump Regulator Disassembly and Reassembly ………………………………….. 3-62
Swing Motor Basic Operation ……………………………………………… 3-66
Swing Motor Parts List …………………………………………………… 3-69
Rebuilding the Swing Motor – Disassembly …………………………………….. 3-70
Swing Motor Reassembly ………………………………………………… 3-75
Swing Motor Gearbox Parts List ……………………………………………. 3-81
Swing Motor Gearbox Disassembly ………………………………………….. 3-82
Swing Motor Gearbox Reassembly ………………………………………….. 3-83
Troubleshooting – Swing Gearbox …………………………………………… 3-85
Control Valve Configuration, Sectional Views and Parts List ………………………….. 3-86
Main Relief Valve ………………………………………………………. 3-90
Port Relief Valve ………………………………………………………. 3-91
Forward Travel Valve Block ……………………………………………….. 3-92
Sequence Valve ……………………………………………………….. 3-93
Boom Priority Block …………………………………………………….. 3-94
Arm Spool …………………………………………………………… 3-95
Boom Spool …………………………………………………………. 3-96
Lock Valve Assembly ……………………………………………………. 3-97
Check Valve Assembly ………………………………………………….. 3-98
Negacon Relief Valve …………………………………………………… 3-99
Forward Travel Spool …………………………………………………… 3-100
Control Valve Schematic Diagram and Port Identification Table ……………………….. 3-101
Control Valve Operation …………………………………………………. 3-104
Control Valve Disassembly ……………………………………………….. 3-114
Pump Flow Control Regulator …………………………………………….. 3-119
Electronic Proportional Control Valve ………………………………………… 3-120
Negacon Modulation Priority ……………………………………………… 3-121
LOWER STRUCTURE
General Description ……………………………………………………… 4-1
Travel Motor and Reduction Gearbox …………………………………………. .4-2
Travel Motor Assembly Parts List ……………………………………………. .4-3
Travel Motor Operation ………………………………………………….. .4-4
Travel Brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . …………………………… 4-5
Travel Motor (Hi/Lo) Tilting Valve ……………………………………………. .4-7
Travel Motor Gearbox ……………………………………………………. 4-9
Travel Motor Gearbox Parts List ……………………………………………. .4-1 0
Travel Motor and Gearbox Disassembly and Reassembly …………………………… .4-11
Travel Motor and Gearbox Disassembly ………………………………………. .4-15
Travel Motor and Gearbox Reassembly ………………………………………. .4-18
Service Standards for Replacing Worn Parts …………………………………… .4-19
Gearbox ……………………………………………………………. 4-20
Reassembling the Gearbox ………………………………………………. .4-25
ii 280LC-III Shop Manual – Revision 1
Travel Motor and Gearbox Troubleshooting ……………………………………. .4-30
Front Idler Roller ………………………………………………………. 4-31
Lower Roller …………………………………………………………. 4-34
Upper Roller …………………………………………………………. 4-36
Track Spring and Track Adjusting Cylinder …………………………………….. .4-39
Service Standards for Lower Travel Frame Components ……………………………. .4-40
Track Tensioning ………………………………………………………. 4-42
ELECTRICAL SYSTEM
General Description ……………………………………………………… 5-1
24 Volt Operation ……………………………………………………….. 5-2
Engine Start-up and Shutdown ……………………………………………… 5-3
Cylinder Preheat – Intake Air Electrical Heater ……………………………………. 5-4
Alternator Circuit ……………………………………………………….. 5-5
Low Current Electrical Circuits ………………………………………………. 5-7
Climate Control (Air Conditioning) Circuit ……………………………………….. 5-9
Power Mode System Operating Components ……………………………………. 5-11
Instrument Panel ………………………………………………………. 5-12
Instrument Panel LED Displays and Input Terminal Connections ………………………. 5-14
Instrument Panel Connector Arrangement ……………………………………… 5-14
Instrument Panel Selector Switches ………………………………………….. 5-15
Instrument Panel Coolant Overheating Circuit …………………………………… 5-15
Instrument Panel Indicator Lights ……………………………………………. 5-15
Instrument Panel Engine Oil Pressure Circuit ……………………………………. 5-16
Start-up Electrical Test Circuit ……………………………………………… 5-16
Interior Lighting ……………………………………………………….. 5-16
Hydraulic Pump Discharge Pressure Sensor ……………………………………. 5-16
Power Mode Circuit Instrument Panel Summary …………………………………. 5-18
Power Mode System Basic Operation ………………………………………… 5-19
Power Mode Ill ……………………………………………………….. 5-20
Power Mode II ………………………………………………………… 5-23
Power Mode I ………………………………………………………… 5-24
Swing Priority Circuit ……………………………………………………. 5-25
Swing and Arm Dump Combined Operation …………………………………….. 5-26
Swing Priority and Arm Crowd Recovery Function ………………………………… 5-27
Loading Work Mode ……………………………………………………. 5-28
Leveling Mode II ………………………………………………………. 5-29
Boom Up, Arm Crowd and Bucket Crowd Combined Operation ……………………….. 5-30
Leveling Mode I: Boom Up and Arm Crowd Combined Operation ………………………. 5-31
Forward Travel: Swing During Straight Travel ……………………………………. 5-32
Forward Travel: Arm Operation or Boom Operation While Traveling ……………………… 5-33
ENGINE
Engine Specifications ……………………………………………………. 6-1
Wear Limits of Major Engine Components ………………………………………. 6-1
Engine Oil Pump Overhaul and Rebuilding ……………………………………… 6-6
Fuel Injection Pump Installation, Alignment and Timing ……………………………… 6-8
Cylinder Headbolt Torque Requirements ………………………………………. 6-10
Engine Throttle Controller ………………………………………………… 6-11
Engine Speed Sensor …………………………………………………… 6-13
INSPECTION, MAINTENANCE AND ADJUSTMENT
Periodic Inspection and Maintenance ………………………………………….. 7-1
Maintenance Intervals ……………………………………………………. 7-2
2B0LC-III Shop Manual – Revision 1 iii
Table of Recommended Lubricants …………………………………………… 7-3
Inspection and Maintenance ……………………………………………….. 7-4
Daily or Every 10 Operating Hours …………………………………………. 7-4
Weekly or Every 50 Operating Hours ……………………………………….. 7-10
150 Operating Hours ………………………………………………….. 7-11
Monthly or Every 250 Operating Hours ……………………………………… 7-12
Three Months or Every 500 Operating Hours ………………………………….. 7-13
Six Months or Every 1,000 Operating Hours ………………………………….. 7-14
Annually or Every 2,000 Operating Hours ……………………………………. 7-15
General Maintenance Procedures …………………………………………… 7-17
Standard Torques ……………………………………………………… 7-18
Torque Wrench Extension Tools …………………………………………….. 7-19
Flange and Thread Sealant Assembly Compounds ……………………………….. 7-20
Welding Precautions and Guidelines …………………………………………. 7-22
Service Standards for Lower Travel Frame Components …………………………….. 7-23
Hydraulic System Cleanliness and Oil Leaks ……………………………………. 7-27
Reference Notes for Foldout Wiring Harness Illustrations ……………………………. 7-28
TESTING, TROUBLESHOOTING AND ADJUSTING
Procedural Troubleshooting Baseline Recommendations …………………………….. 8-1
Pilot Pressure …………………………………………………………. 8-2
Power Mode Valve ………………………………………………………. 8-3
Boom/Swing Priority …………………………………………………….. 8-4
Negacon, Negative Control ………………………………………………… 8-5
Pressure Up Valve ………………………………………………………. 8-6
Pump Input Power Control …………………………………………………. 8-7
Flow Meter and Flow Meter Kit Installation and Testing ……………………………… 8-9
Swing System Troubleshooting …………………………………………….. 8-10
Troubleshooting – Swing …………………………………………………. 8-12
Troubleshooting – Swing Gearbox …………………………………………… 8-13
Troubleshooting – Hydraulic Problems ………………………………………… 8-14
Troubleshooting – Control Valve …………………………………………….. 8-16
Troubleshooting – Travel Control Valve ………………………………………… 8-18
Troubleshooting – Joystick Control Valve ………………………………………. 8-19
Troubleshooting – Engine Problems ………………………………………….. 8-20
Troubleshooting – Electrical System ………………………………………….. 8-24
EPOS-111 Self-diagnostic Codes …………………………………………….. 8-25
Engine Throttle Controller ………………………………………………… 8-27
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