Part of the Doosan Repair Manuals.
What's inside: the full Doosan factory repair manual for the DX140LCR-3, publication 950106-01021E, printed December 2012. The LCR is the short tail swing machine - the rear of the house turns inside 1,995 mm (6' 7"), which is why you bought it for wall lines and lane closures, and why generic 14-tonne excavator guides don't match it. This book does. You get teardown and rebuild procedures for the main pump, swing motor (SP002919), travel device (SP002920), cylinders and center joint, hydraulic testing and adjustment with the real relief settings (330/350 kg/cm2), track and undercarriage wear limits, Cummins QSB4.5 engine coverage, cabin/ROPS and counterweight removal, and boom and arm pin specs for both one-piece and two-piece booms.
What's Inside This Doosan DX140LCR-3 Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| Table of Contents | 1-4 | - |
| Safety | 5-74 | - |
| Specifications | 75-104 | Specifications for DX140LCR-3, General Description, Component Locations, General Dimensions, One - Piece Boom, Two - Piece Boom |
| General Maintenance | 105-142 | General Maintenance Instructions, Welding Precautions and Instructions, Hydraulic System - General Precautions, Maintenance Service and Repair Procedure, General Precautions, Hydraulic System Cleanliness and Oil Leaks |
| Upper Structure | 143-242 | Cabin, Cabin Identification, Rollover Protective Structure (ROPS), Removal, Installation, Counterweight |
| Lower Structure and Chassis | 243-274 | Track Assembly, General Description, Track Tension, Cleaning and Inspection (Wear Limits and Tolerances), Track Shoe, Lower Roller |
| Engine and Drivetrain | 275-582 | QSB4.5 Engine, General Information, About the Manual, How to Use the Manual, Symbols, Illustrations |
| Hydraulics, Hydraulic System Troubleshooting, Testing and Adjustment SP002916 | 583-618 | Hydraulics, Hydraulic System - General Notes, Hydraulic Schematic, General Notes, Operation of Working Components, Boom Operating Circuit |
| Hydraulics, Accumulator SP002455 | 619-626 | Accumulator, General Description, Specifications |
| Hydraulics, Center Joint (Swivel) SP002917 | 627-638 | Center Joint (Swivel), General Description, Troubleshooting, Testing and Adjustment, Inspection, Testing |
| Hydraulics, Cylinders SP002918 | 639-678 | Cylinders, General Description, Theory of Operation, Special Tools and Materials, Piston Nut |
| Hydraulics, Swing Motor SP002919 | 679-714 | Swing Motor, Instruction Manual, Indication of Type, Specifications, Construction and Principles of Working, Precaution in Use |
| Hydraulics, Travel Device SP002920 | 715-786 | Travel Device, Product Overview, General Specifications, External Dimensions, General Description, Operating Description |
| Hydraulics, Troubleshooting, Specifications & Disassembly | 787-954 | Main Pump, Disassembling and Reassembling Procedures, Tool, Disassembling Procedures, Reassembling Procedures, Pump Maintenance Criteria |
| Electrical System | 955-1084 | Electrical Supply System, Engine Starting Circuit, Start Operation, After Start, Engine Preheating System, Engine Stop |
| Attachments | 1085-1114 | Boom and Arm, Front Attachment Pin Specifications, DX140LCR-3, Front Attachment - Removal and Installation, Arm Removal Procedure, Boom Removal Procedure |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Minimum swing radius (rear) | 1,995 mm (6' 7") | p. 89 |
| Main relief pressure (normal / power up) | 330 kg/cm² (4,689 psi) / 350 kg/cm² (4,970 psi) | p. 98 |
| Shipping weight | 15.1 tons (33,289 lb) | p. 92 |
| Fuel tank capacity | 220 liters (58 U.S. gal) | p. 92 |
| Hydraulic reservoir capacity | 85 liters (22.4 U.S. gal) | p. 92 |
| Hydraulic system capacity (total) | 161 liters (42.5 U.S. gal) | p. 92 |
| Standard boom weight | 779 kg (1,717 lb) | p. 92 |
| Two-piece boom weight | 911 kg (2,154 lb) | p. 92 |
Doosan DX140LCR-3 Common Problems This Manual Covers
Machine feels down on power, digging force faded, everything moves but slowly
Do not swap the pump on a guess. The Hydraulic System Troubleshooting, Testing and Adjustment section (SP002916) shows where to tee in gauges and how to verify main relief at 330 kg/cm2 normal and 350 kg/cm2 in power up, then walks the circuit-by-circuit checks to isolate pump, relief or actuator.
Manual Section: Hydraulics - Hydraulic System Troubleshooting, Testing and Adjustment SP002916 p. 98Track thrown, tension wrong, or rollers and shoes wearing fast on one side
The Track Assembly section in Lower Structure and Chassis gives the correct tension procedure plus cleaning and inspection tables with wear limits and tolerances for shoes, links and lower rollers, so you measure and replace only what is actually out of spec instead of guessing at undercarriage life.
Manual Section: Lower Structure and Chassis - Track Assembly p. 243Boom or arm drifts down under load with the levers centered
Usually piston seals or a leaking holding path, not the pump. The Cylinders section (SP002918) covers theory of operation, parts breakdown, the special tools you need and the piston nut procedure, so you can reseal a drifting cylinder on the bench rather than sending it out.
Manual Section: Hydraulics - Cylinders SP002918 p. 643Weak or jerky travel on one side, or oil weeping from the swivel under the house
Two sections work together here: the Travel Device manual (SP002920) covers operation, specs and rebuild of the final drive and travel motor, while the Center Joint section (SP002917) gives the parts list, troubleshooting and seal inspection for the swivel that feeds oil to the undercarriage.
Manual Section: Hydraulics - Travel Device SP002920 / Center Joint SP002917 p. 243Frequently Asked Questions
How do I know this is the right manual for my machine and not a near-identical Doosan book?
Check the publication number. This is 950106-01021E, printed December 2012, and it is titled for the DX140LCR-3 specifically. Doosan reused layouts across models, so the pub number on the cover is the only reliable way to match manual to machine. If your data plate says DX140LCR-3, this is your book. p. 92
Can I test and reset the hydraulic relief pressures with this manual?
Yes. The Hydraulic System Troubleshooting, Testing and Adjustment section (SP002916) walks you through gauge hookup and adjustment, and the manual gives the factory numbers: 330 kg/cm2 (4,689 psi) main relief, 350 kg/cm2 (4,970 psi) in power up. If the machine feels weak under load, this is where you start before condemning the pump. p. 98
Does it include a hydraulic schematic for the LCR?
Yes, a full hydraulic schematic titled for the DX140LCR-3 (SP002924), plus circuit-by-circuit operating descriptions - boom, arm, swing, travel. That matters because the reduced tail swing machine is not identical to standard-radius layouts, and tracing a stuck function off the wrong schematic wastes days. p. 89
Are there electrical wiring diagrams in this manual?
Straight answer: no harness-level wiring diagrams. The Electrical System section covers the supply system, engine starting circuit, preheating and stop circuits with theory, instrument tables and control-system block diagrams. That is enough to diagnose start, charge and preheat problems, but if you need pin-by-pin harness tracing, this book alone won't do it. p. 275
Does it cover the Cummins QSB4.5 engine and both boom options?
Yes on both. The Engine and Drivetrain section is built around the QSB4.5. The Specifications section carries dimensions for the one-piece boom (779 kg / 1,717 lb) and the two-piece boom (911 kg / 2,154 lb), and the Attachments section gives pin specs and removal procedures for either setup. p. 275
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