Part of the Doosan Repair Manuals.
Looking for the Doosan DX27Z shop manual PDF? All 586 pages of this factory shop manual (OEM #K1028288E) cover the zero-tail-swing track excavator, from swing bearing to bucket pins. The hydraulics section alone walks you through the main pump, swing motor, travel motor, center joint, and main control valve, with teardown and rebuild steps for every cylinder on the machine. You also get full electrical schematics, hydraulic schematics, standard torque tables, and track assembly procedures for the undercarriage. Set worm-drive hose clamps under 44 mm to 20-30 in-lb, and know the hydraulic tank takes exactly 30 liters before you crack a fitting. Your excavator is down; forum threads won't lift it. This bookmarked PDF opens on any device, so search the spec, walk to the machine, and fix it.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Safety | 5-50 | Track Excavator Safety |
| Specifications | 51-76 | Specification for DX27Z |
| General Maintenance | 77-114 | General Maintenance Procedures, Standard Torques |
| Upper Structure | 115-132 | Cabin, Swing Bearing |
| Lower Structure and Chassis | 133-162 | Track Assembly |
| Engine and Drive Train | 163-172 | Drive Coupling (Main Pump) |
| Accumulator | 175-182 | General Description, Specifications, Precharge Pressure, Accumulator Charging with Nitrogen, Bleeding Residual Pilot Pressure |
| Center Joint (Swivel) | 183-194 | Center Joint Disassembly Diagram, Disassembly, Reassembly |
| Cylinders | 195-206 | Construction, Internal Construction, Disassembly Procedures, Internal Component Disassembly Procedure, Assembly, Assembly Procedure, Inspection, Cautions to Be Taken at Assembly |
| Swing Motor | 207-252 | Features, Specifications, Description of Functions and Operation, Swash Plate Motor, Parking Brake (for the Parking Brake Spec. Only), Principle of Operation of the Relief Valve, Make-Up Valve, Reduction Gear (Planetary Two-Stage), Precautions for Handling |
| Travel Motor | 253-316 | Structure of Traveling Motor, Features, Structure and Function, Axial Piston Motor, Working Principle of Counter Balance Valve, Mechanism, Working Principle of Anti Cavitation Valve, Working Principle of Parking Brake, Working Principle of Reduction Unit |
| Main Pump | 317-372 | Principal Components and Functions, Piston Pump, Valve Assembly and Relief Valve, Principle of Operation, Adjustment, Installation, Drive, Hydraulic Oil, Starting Procedure |
| Main Control Valve | 373-452 | Disassembly and Assembly of the Product, Warning Indication, Specifications, Usage Precautions, Installation, Configuration and Operation, Main Relief Valve (P1, P2), Main Relief Valve (P3), Overload Relief Valve, Relief Plug |
| Remote Control Valve (Work Lever / Joystick) | 453-470 | Theory of Operation, Parts List, Specifications, Tools and Materials, Disassembly |
| Travel Control Valve | 471-504 | Specifications, Operation, Reducing Valve Section, Operation Section Damping Mechanism, Maintenance, Special Jig for Disassembling/Reassembling, Disassembling Instructions, Assembling Instructions, Troubleshooting and Corrective Measures |
| Pedal Valve | 505-518 | Parts List, Specifications, Tools and Materials, Disassembly, Assembly |
| Hydraulic Schematic (DX27Z) | 519-525 | Full Hydraulic Circuit Diagram, Component Legend, Pump and Main Control Valve Routing, Circuit Coverage for DX27Z |
| Electrical System | 526-560 | Electrical Schematic (DX27Z) |
| Attachments | 561-586 | Working Attachments, Bucket |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic tank capacity | 30 liters | p. 66 |
| Fuel tank capacity | 30 liters | p. 66 |
| Torque for Worm Drive hose clamp (Under 44 mm / 1-3/4 in Open Diameter) | 20 - 30 in lb | p. 108 |
| Torque for Worm Drive hose clamp (Over 44 mm / 1-3/4 in Open Diameter) | 40 - 50 in lb | p. 108 |
| Cabin weight | 240 kg (529 lb) | p. 123 |
| Recommended viscosity range | 16 ~ 36 mm2/s | p. 329 |
| Engine Coolant Temperature Sensor Input Specification (50°C) | 350 Ω | p. 549 |
| Engine Coolant Temperature Sensor Input Specification (80°C) | 118 Ω | p. 549 |
| Operating Weight | 2.71 tons | p. 66 |
| Main Relief Set Pressure | 220 kg/cm2 | p. 66 |
| Fuel Tank Capacity | 30 liters | p. 66 |
| Hydraulic Tank Capacity | 30 liters | p. 66 |
