Description

Doosan DX255LC-5 2014 Workshop Manual – 1316 Pages of Factory Specs

If you’ve ever had a track come off because the tension was off by a quarter inch, or pulled a head bolt and wondered if the spec in some aftermarket PDF was a typo, you know why this matters. I’ve been wrenching for 28 years, and I’ve seen too many jobs go sideways because the manual on the bench was wrong. The Doosan DX255LC-5 2014 Workshop Manual fixes that. 1316 pages of factory-authorized data, not a third-party rewrite. This is the same document the dealer techs use—straight from Doosan’s 2014 original press.

Page 1 gives you the serial number range (1001 and up) and the copyright date. That’s not fluff; that tells you exactly which machine this applies to. The manual is divided into five major sections: Safety, Specifications, General Maintenance, Engine, Upper Structure, and Lower Structure and Chassis. Each section opens with safety instructions that are specific to the task. No generic warnings about wearing safety glasses—these cover pressurized fluids, electrical shock from the swing circuit, and track tension hazards.

Track Excavator Maintenance Safety – What the Manual Covers

Before you drop the undercarriage, you need to read the Safety section. It’s not a skip section. It covers proper blocking, high-pressure line handling, battery boost procedures, and what to do when the accumulator is charged. The manual gives you a clear sequence: Warning Tag installation, cleaning, proper tools and clothing, then disassembling precautions. Page 5 lists the Table of Contents so you can jump to any subsection. I’ve seen guys take shortcuts with track tension adjustments and end up with a broken grease gun hose. This manual spells out the correct procedure under “Track Tension Adjustments” inside the Maintenance subsection. Follow it, period.

Specifications: Overall Dimensions and Working Range Data

The Specifications section is where you find the actual numbers for your Doosan DX255LC-5. It includes overall dimensions for one-piece and two-piece boom configurations, working range charts, and approximate weight of workload materials. There’s a subsection on Performance Tests with operational performance standards. If you’re rebuilding a swing motor or replacing a travel device, you need the cycle time data and swing speed specs. This manual gives you the test procedures and the acceptable tolerance for each function. No guesswork—you get the factory numbers for track revolution speed, travel speed, and mistrack check.

Standard Torques – Factory Values for Metric and U.S. Fasteners

This is where aftermarket manuals fall flat. The General Maintenance section includes a dedicated subsection on Standard Torques with torque values for standard metric fasteners, standard U.S. fasteners, Type 8 phosphate coated hardware, and hose clamps. It also covers ORFS swivel nut torque values. If you’ve ever stripped an M12 cap screw because you used the generic chart from a hardware store, you understand why having the OEM spec matters. The manual lists the torque in ft-lbs and N·m. Use the right torque wrench—beam type, not a clicker that hasn’t been calibrated since 2009.

Lower Structure and Chassis: Track Assembly and Travel Device

The Lower Structure and Chassis section covers the swing bearing, center joint, travel device, and track assembly. These are the components that take the most abuse on a track excavator. If you’re replacing a track chain or adjusting tension, the manual includes the step-by-step procedure for the track assembly—including the proper sequence for track release and tensioning. It also covers the travel device removal and installation, which is a job you don’t want to screw up. The center joint seal replacement procedure is in here too. Use the OEM data, not a YouTube video from a guy in a gravel lot.

1316 Pages – How the Manual Is Organized for Your Workbench

1316 pages sounds like a lot, but it’s broken into digestible chunks. The Engine section covers the engine itself and the coolant heater option. Upper Structure goes through the cabin, counterweight, hydraulic oil tank, fuel tank, main pump, drive coupling, main control valve, swing device, gear pump, joystick valves, travel control valve, solenoid valve, EPPR valve, and accumulator. Each component has its own subsection with disassembly, inspection, and assembly procedures. You don’t need to read the whole thing to fix a leaky main control valve—you flip to that subsection. The PDF is searchable, so you can find “accumulator” or “swing brake” in seconds.

Why OEM Documentation Matters for This Doosan Machine

Third-party manuals take the OEM data, copy it, and often delete sections to save space. I’ve seen aftermarket copies that omit the safety warnings because “nobody reads them.” That’s how technicians get hurt. This manual is the original Doosan print—copyright 2014, part number 950106-01505E. The torque specs are verified through Doosan engineering. The wiring diagrams? Not included here (this is a workshop manual, not an electrical manual), but the hydraulic schematics and component locations are from the factory. If you need the electrical side, look for the separate Doosan electrical schematic manual for the DX255LC-5.

Related manuals you might need:
DOOSAN DX255LC-5 2014 Workshop Manual
Doosan Solar 340LC-V 2002 Workshop Manual – 656 Pages OEM
Doosan DX140W, DX160W 2006 Workshop Manual – 1180 Pages

For reference on general principles, consult external resources like the Manual Transmission page for understanding mechanical power flow, or the Manual Transmission article for gear ratio basics—though for excavator-specific data, stick with the OEM manual.

Does this manual include torque values for the travel device bolts?

Yes. The Standard Torques subsection lists values for both metric and U.S. fasteners. You’ll find the correct torque for the travel device mounting bolts in the upper-structure section specifications. Use the torque values from the fastener type table—don’t guess.

What page shows the track tension procedure?

Page 5 points to the Maintenance Safety subsection. Track tension adjustments are covered there.

Access the Factory Manual. It’s the same 1316-page document that Doosan put on the dealer network in 2014. You get the full PDF—searchable, printable, and complete. No missing pages, no reprints from a photocopier. Get the Doosan DX255LC-5 2014 Workshop Manual on your workbench today.