Part of the Doosan Repair Manuals.
This is the factory shop manual for the Doosan DX420LC-5 crawler excavator, publication 950106-01020E, 1st Edition April 2014. It covers the whole machine: the Scania-built Doosan DC 13 engine rated 257 kW (345 HP) at 1,800 rpm with its Tier 4 Final aftertreatment, the main pump, main control valve, swing device and travel motors with disassembly, parts lists and section views, plus cabin, ROPS, swing bearing, boom and arm removal, and full electrical coverage. Machine specs like the 3,760 mm (12' 4") tail swing radius and 5,200 mm (17' 1") track length are on page 86. The final chapter carries the oversize hydraulic and electrical schematic foldouts, pages 1573 and 1574.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 7-74 | Track Excavator Maintenance Safety, Safety Messages, Safe Operation Is Operator's Responsibility, Know Your Machine, Proper Work Tools and Attachments, Pressurized Fluids |
| Specifications and General Maintenance | 75-144 | Specifications, General Description, Component Locations, General Dimensions, Working Range, General Specifications |
| Engine - Inspection to Tightening Torques | 145-200 | Engine, Overview, Inspection, Cleaning the Engine, Special Tools, Mounting the Engine in a Universal Stand |
| Engine - Cylinder | 201-255 | Cylinder, Cylinder Head, Valve Mechanism, Cylinder Block, Cylinder Liner, Flywheel Housing |
| Engine - Actuating System and Lubrication System | 256-325 | Actuating System, Camshaft, Connecting Rod, Crankshaft, Flywheel, Piston |
| Engine - Exhaust System | 326-414 | Exhaust System, General Information, T113, Exhaust Temperature Sensor Before Catalytic Converter, T115, NOx Sensor, T131 NOx Sensor, T116, Reductant Pick-Up Unit |
| Engine - Cooling System and Fuel System | 415-479 | Cooling System, Internal Cleaning of Cooling System, Charge Air Cooler, Charge Air Temperature Sensor, Charge Air Pressure Sensor, Coupling Coil for AC Compressor |
| Engine - Electrical System to Engine Coolant Heater (Option) | 480-564 | Electrical System, E44, Control Unit EMS, Control Unit EEC, Engine Speed Sensor, T110 Oil Level Sensor, T111, Fuel Pressure Sensor |
| Upper Structure - Cabin to Fuel Tank | 565-632 | Cabin, Cabin Identification, Roll-Over Protective Structure (ROPS), Removal, Installation, Dimensions of Cabin Glass |
| Upper Structure - Main Pump | 633-718 | Main Pump, Specifications, Overview, Hydraulic Circuit, Parts List, Theory of Operation |
| Upper Structure - Drive Coupling (Main Pump) | 719-730 | Drive Coupling (Main Pump), Specification, Parts List, Section View, Tools, Disassembly |
| Upper Structure - Main Control Valve | 731-818 | Main Control Valve, Specification, Overview, Hydraulic Circuit, Parts List, Theory of Operation |
| Upper Structure - Swing Device | 819-876 | Swing Device, Specification, Overview, Hydraulics Circuit, Parts List, Theory of Operation |
| Upper Structure - Fan Pump for Oil Cooler | 877-914 | Fan Pump for Oil Cooler, Specification, Overview, Parts List, Theory of Operation, Maintenance Guidelines |
| Upper Structure - Fan Motor for Oil Cooler to Joystick Valve (Work Lever) | 915-972 | Fan Motor for Oil Cooler, Specification, Overview, Parts List and Section View, Precaution, Tools |
| Upper Structure - Travel Control Valve (with Damper) to Accumulator | 973-1028 | Travel Control Valve (with Damper), Specification, Overview, Parts List, Theory of Operation, Tools and Torques |
| Lower Structure and Chassis | 1029-1162 | Swing Bearing, General Description, Parts List, Maintenance Guidelines, Disassembly, Reassembly |
| Front | 1163-1222 | Boom and Arm, Specifications, Removal, Arm Removal, Boom Removal, Installation |
| Hydraulic System | 1223-1312 | General Description, Hydraulic Schematic, Hydraulic Component and Oil Flow, Hydraulic Component, Main Oil Line |
| Electrical System | 1313-1484 | Electrical Supply System, Engine Starting Circuit, Start Operation, After Start, Engine Stop |
| Options | 1485-1568 | One Way, General Description, Theory of Operation, Hydraulic Circuit, Caution for Installation, Installation Procedure |
| Schematic | 1569-1574 | Hydraulic Schematic / Electrical Schematic |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Engine model | Doosan DC 13 (built by Scania), US EPA Tier 4 Final (EU Stage IV) | p. 167 |
| Rated net power | 257 kW (345 HP) @ 1,800 rpm (SAE J1995) | p. 167 |
| Tail swing radius | 3,760 mm (12' 4") | p. 86 |
| Counterweight clearance | 1,265 mm (4' 2") | p. 86 |
| Track length | 5,200 mm (17' 1") | p. 86 |
| Undercarriage width, standard | 3,350 mm (11' 0") | p. 86 |
| Undercarriage width, narrow | 3,000 mm (9' 10") | p. 86 |
| Shoe width | 600 mm (2' 0") | p. 86 |
| Height over cab | 3,154 mm (10' 4") | p. 86 |
| Travel motor displacement and relief | 160 cc/rev, 343 bar (350 kg/cm²) at 25 L/min | p. 1065 |
| Swing motor test pressure | 196 bar (200 kg/cm²) at 8 rpm for the volumetric efficiency check | p. 1126 |
