Doosan DX345LC-9C

The Doosan DX345LC-9C has an operating weight of approximately 34,800–35,500 kg (76,700–78,200 lbs), depending on attachments and undercarriage configuration. It is powered by a Doosan DL08K diesel engine delivering 212 kW (284 hp) at 1,900 rpm. The engine meets Tier 4 Interim emissions standards using cooled exhaust gas recirculation (EGR) and a diesel particulate filter (DPF) – no SCR (AdBlue) required, which reduces operating complexity for used buyers.

In standard earthmoving conditions, the DX345LC-9C consumes 18–22 L/hour (4.8–5.8 gal/hour) under moderate load, and 24–28 L/hour (6.3–7.4 gal/hour) during heavy digging or rock work. Compared to its predecessor (DX340LC-7), the -9C model delivers up to 12% better fuel efficiency due to advanced hydraulic management and the Smart Power Control system, which automatically matches engine rpm to hydraulic demand.

The DX345LC-9C features a variable displacement axial piston pump with a maximum flow of 2 × 235 L/min (62 gal/min total) at 1,900 rpm. Relief pressure is set at 350 bar (5,076 psi). Bucket digging force (ISO) reaches 23,500 kgf (51,800 lbf), and arm digging force (ISO) is 18,800 kgf (41,400 lbf). These figures make it highly capable for tough materials like clay and compacted gravel, even as a used unit – provided main pump pressures are checked during inspection.

Under normal working conditions (mixed dirt/rock), OEM track chains and pads last 4,500–6,000 hours before requiring replacement. The LC (long carriage) undercarriage has track shoe widths of 600 mm or 700 mm (optional 800 mm for soft ground). Used units with 3,000–5,000 hours typically show 40–60% wear on bushings and sprockets. Critical inspection points: check track adjuster cylinder leaks, lower roller side wear (acceptable limit ≤3 mm radial play), and idler flange thickness. Re-bushing or pin-turn can extend life by 1,500–2,000 hours.

High-hour used units (over 8,000 hours) may show:

• Swing bearing wear – check vertical play (acceptable <3 mm) and grease purge from seals.

• Main control valve sticking – due to degraded pilot oil; repair costs approx. $2,500–$4,000.

• DPF regeneration frequency – excessive regeneration (every 15–20 hours vs normal 40–50 hours) indicates injector or EGR issues.

• Boom/frame cracks – inspect near boom foot and turntable mounting bolts.
  Pro data tip: Engine oil analysis should show iron <100 ppm and silicon <15 ppm for normal wear. Average used price range (2025–2026): $65,000–$95,000 USD depending on hours, condition, and location.