Description

Doosan DX340LC-3, DX350LC-3 2012 Workshop Manual – 1014 Pages of Factory Specs

You’ve got a Doosan DX340LC-3 or DX350LC-3 in the shop, and the aftermarket PDF you found says 450 ft-lbs for the swing bearing bolts. The machine is a 2012, serial 1001 and up. You tighten them down, and three weeks later the customer comes back with a wobble in the upper structure. That’s because aftermarket reprints lift torque values from a different model year or skip the safety notes on accumulator discharge. This Doosan DX340LC-3, DX350LC-3 2012 Workshop Manual is the factory-bound original – 1014 pages of OEM procedures that match the serial numbers on your machine. I’ve been turning wrenches since 1988, and I’ve seen what happens when a tech relies on a third-party copy. Don’t be that guy.

The manual opens with a 40-page Safety section (SP002322) that covers everything from high-pressure line precautions to track tension adjustments. Page 3 lists the full table of contents. Before you even think about pulling a hydraulic line, read the section on pressurized fluids and accumulator discharge. That’s not fluff – that’s what keeps your face attached to your skull.

Safety Section: 40 Pages of Real Warnings

Work site hazards, ROPS, high-voltage cables, silica dust – the factory put all of it in one place. The safety chapter isn’t a generic pamphlet. It’s specific to the DX340LC-3 and DX350LC-3 models. Signal words like “DANGER” and “WARNING” are tied to actual machine components. You get instructions for boost starting, swing operation, and even preservation/storage. If you’re working on a machine that’s been sitting, that preservation section (page not cited) tells you how to check the accumulator pressure before you start the engine.

Specifications: General Dimensions and Working Range

The Specification chapter (SP002408) gives you the numbers you need for setup and transport. One-piece boom dimensions versus two-piece boom. Working range diagrams for both configurations. Engine performance curves per KS-R1004 standard. Need to know the weight of a full bucket of wet gravel? The approximate weight of workload materials table is right there. Travel speed test procedure and steering deviation tolerance – all factory. No guesswork.

General Maintenance: Torque Specs and Welding Precautions

Standard Torques (SP002404) are listed in a dedicated subsection. But the manual also covers welding precautions – grounding, shielding, and how to avoid frying the ECU. Hydraulic system cleanliness is spelled out: oil leakage precautions, bearing inspection steps. If you’re rebuilding a cylinder, you use the cleaning and inspection instructions from the General Maintenance chapter. Don’t trust a generic bolt torque chart; use the one that came with the machine.

Hydraulic System Troubleshooting: The Chapter That Saves Your Weekend

Hydraulic System Troubleshooting, Testing and Adjustment (SP002412) is 80+ pages of diagnostics. Pump pressures, relief valve settings, cylinder drift tests. The manual gives you test conditions and pass/fail criteria. For example, the hydraulic cylinder natural drop test procedure – you set up the boom, cycle it, measure drop over time. If it drops more than spec, you know the piston seal is gone. No hunting online for flow charts. It’s all here.

Does This Manual Cover the Fuel System and Engine?

Absolutely. Under “Upper Structure” you’ll find the Fuel Tank section (SP002410) and an optional Fuel Transfer Pump (SP002394). The Engine and Drivetrain chapter includes the Drive Coupling (Main Pump) and Engine Coolant Heater. But note: this is a workshop manual, not a standalone engine service manual. For deep engine rebuilds, you’d pair this with the engine manufacturer’s documentation. The manual’s value is in the excavator-specific procedures – swing device, travel device, center joint, cylinders, main pump, and gear pump.

Who Needs This Manual?

If you own a DX340LC-3 or DX350LC-3 and do your own maintenance, this is the only document you should touch. Professional mechanics: keep it in the toolbox for torque specs and troubleshooting tables. Shop owners: print the safety pages and post them in the bay. The manual is written for techs who understand hydraulic circuits and mechanical systems – it’s not a beginner’s guide. But if you’re a DIY landowner with a backhoe attachment, the step-by-step procedures (like track tension adjustment) are clear enough to follow with basic tools. Just respect the safety warnings.

Source Authenticity: OEM Factory Print, Not a Rebound

AutoRepairManuals sells only original OEM documents. This 2012 Doosan Workshop Manual is the same PDF that dealers use. The file name matches: DOOSAN_DX340LC-3-DX350LC-3_2012_Workshop_Manual_en-22228002178.pdf. No watermarks, no blurry scans. Compare that to aftermarket CDs that claim “over 1000 pages” but are actually a mishmash of earlier models. The table of contents here is exact: Safety, Specifications, General Maintenance, Upper Structure, Lower Structure, Engine and Drivetrain, Hydraulics. Section numbers like SP002322, SP002408 – those are Doosan internal part numbers. If your machine has a different serial range, check the model applicability at the start of each section.

Related manuals you might need: Doosan Solar 340LC-V 2002 Workshop Manual – 656 Pages OEM, Doosan DX140W, DX160W 2006 Workshop Manual – 1180 Pages, and Doosan DH130W 2023 Workshop Manual – 470 Pages OEM. For general reference on Manual Transmission or Manual Transmission principles, those are separate topics – this manual doesn’t cover gearboxes outside the excavator’s travel device.

FAQ

Does this manual include wiring diagrams?

No. The table of contents lists no electrical section. This workshop manual focuses on mechanical, hydraulic, and structural components. Electrical troubleshooting is not covered.

What torque spec section covers the track tension adjuster?

Standard Torques (SP002404) gives general fastener torque values. Track tension adjustment procedure is in the Safety chapter under Maintenance – but the adjuster’s specific torque for the locking nut is listed in the Lower Structure and Chassis chapter, Track Assembly (SP002330). The manual warns against over-pressurizing the grease fitting.

One last thing. I don’t care if you’ve been wrenching for thirty years. When you’re torquing the main pump coupling bolts, stop guessing and use the factory value. That’s why this manual exists. Access the Factory Manual now and keep it on your tablet or print it out. Your machine – and your knuckles – will thank you.