Construction Machinery

The Komatsu PC300 is a 30-ton class hydraulic excavator. Depending on the specific series (-3, -5, -6, -8, or -8M0/-8M2), specifications vary slightly. For the modern PC300-8M2 model, the operating weight ranges from approximately 34,600 kg to 34,520 kg . The machine is powered by the Komatsu SAA6D114E-3 engine (Tier 3 equivalent), delivering 194 kW (260 HP) at 1,950 rpm .

Key dimensional data for shipping/logistics planning:

• Overall length (transport): Approx. 11,400 mm

• Overall width: Approx. 3,190 mm

• Tail swing radius: 3,550 mm

The standard bucket capacity ranges from 1.6 m³ to 2.2 m³ (heaped), depending on configuration and attachment .

Based on operational data from multiple sources, the Komatsu PC300 consumes approximately 10 to 15 liters per hour (2.6 to 4.0 gallons/hr) under standard digging conditions . However, the machine features a large 605-liter (160-gallon) fuel tank, allowing for approximately 40-60 hours of continuous operation on a single fill .

Efficiency Tip: Newer series models (PC300-8M0/8M2) are equipped with Komatsu’s E-mode (Economy mode) and Eco-gauge energy-saving features. These systems, combined with the CLSS (Closed Center Load Sensing System) hydraulic technology, can reduce fuel consumption by 10-15% compared to previous generation models . The hydraulic system pumps oil only when required, eliminating wasteful flow.

When inspecting a used Komatsu PC300, buyers should focus on three specific areas based on field repair data and service manuals:

1. Swing System (回转系统): A frequently reported issue on PC300LC-2 and similar models is the swing function suddenly stopping while other functions work normally. Common causes include:

   • Swing lock solenoid/valve stuck closed – check for 12V signal at the solenoid

   • Swing-specific pilot spool contamination – individual spools can get stuck mechanically

   • Swing motor brake not releasing

2. Hydraulic Pump (主泵): The PC300 series uses a dual-variable displacement piston pump. Watch for:

   • LS (Load Sensing) pressure misalignment causing reduced digging force

   • Pump PC control circuit pressure abnormalities (can be diagnosed via monitoring system)

3. Engine Speed Sensor (转速传感器): A common cause of “slow action” or “no power” (derating) is a faulty Ne (engine speed) sensor or Bkup sensor, causing the computer to misread RPMs. Fault codes CA115 (Ne and Bkup sensor) or CA689 (Ne sensor) indicate this issue .

4. Undercarriage: Standard track shoe width is 600 mm. Check track chain tension and bushing wear .

For the Komatsu PC300 series, the average service life ranges from 10,000 to 15,000 hours before requiring a major overhaul (engine rebuild or hydraulic pump replacement), provided the machine has been maintained according to Komatsu standards.

Pro Tip: When equipped with a hydraulic breaker, maintenance intervals must be shortened significantly. The hydraulic oil deteriorates faster than for normal bucket digging. Komatsu recommends replacing hydraulic elements after the first 100-150 hours on new machines, then at accelerated intervals for breaker use (every 250 hours of breaker operation at 50% duty cycle) .

While newer models like the PC300-8M2 or PC350LC-8M2 offer Tier 4 Final emissions technology, the Used Komatsu PC300 (particularly -6, -8, or -8M0 series) remains a global favorite for aftermarket sales and export due to four key factors:

1. Emissions Simplicity: The PC300 with SAA6D114E-3 engine (Tier 3 / Stage IIIA equivalent) does NOT require DPF (Diesel Particulate Filter) or DEF (AdBlue/Diesel Exhaust Fluid). This makes it significantly cheaper to run and maintain in developing countries where low-sulfur fuel quality and DEF availability are inconsistent .

2. No Regional Software Locks: Many -8 series and earlier units do not have the Komtrax regional locking features found on newer models, making them easier to export and operate globally without expensive dealer unlocking fees .

3. Parts Availability & Cost: Parts for the PC300 series are widely available through aftermarket channels. Repair costs are approximately 20-30% cheaper than current generation models. The comprehensive service manuals (covering PC300-3, -5, -6, -8) provide detailed troubleshooting, testing, and adjustment procedures for DIY repairs .

4. Proven Reliability: The PC300 platform has been in production for over 20 years across multiple dash versions (-3 through -8M2). This maturity means most design flaws have been identified and resolved, and the machine’s performance characteristics are well-documented and predictable .