Thermal Balance Comparison and Selection Recommendations for Compact Excavators

I. International Brands (Benchmarks for Thermal Balance)

1. Komatsu

· Core strengths: Full-working-condition thermal balance + intelligent temperature control + high reliability

· Adopts the Modine EVantage liquid cooling system with multi-loop independent temperature control, enabling precise zoned heat dissipation for batteries, electric drives and hydraulic systems.

· The engine is deeply matched with the hydraulic system, with an oil temperature control accuracy of ±2℃, ensuring unattenuated continuous operation in high-temperature environments.

· Electronically controlled fan + intelligent thermal management algorithm enable stable operation in a wide temperature range of -10℃~45℃.

· Representative models: PC35MR-5, PC55MR-5 (benchmarks for thermal balance of mini excavators).

2. Liebherr

· Core strengths: Self-developed full-link thermal management + ultimate structural heat dissipation

· Self-developed engine, hydraulic and electronic control systems, optimized power cabin flow field, and 30% improvement in heat dissipation efficiency.

· Independent hydraulic oil cooling circuit + plate heat exchanger, maintaining oil temperature stably at 35–55℃.

· Verified thermal balance under three working conditions (plateau, high temperature, frigid zone), supporting 12 hours of full-load continuous operation without overheating.

· Representative models: R914 Compact, A 918 Compact (benchmarks for thermal balance of wheeled mini excavators).

3. Kubota

· Core strengths: Engine inherent thermal balance + compact and efficient heat dissipation

· Direct injection engine + ultra-low emission combustion technology, featuring low thermal load and reduced heat dissipation pressure.

· Integrated oil-water cooling + high-flow radiator, with a compact structure, fast heat dissipation and low failure rate.

· Intelligent idle speed + ECO mode reduce invalid heat generation and ensure strong stability in continuous operation.

· Representative models: KX057-4, U55-5 (renowned for excellent thermal balance among mini excavators).

II. Domestic Brands (First Tier of Thermal Balance)

1. Sunward Intelligent

· Core strengths: Precise temperature control + high-load continuous operation

· Fin-type radiator + variable oil cooling system, with an oil temperature control accuracy of ±3℃.

· In-depth matching and calibration of the engine-hydraulic-heat dissipation system, achieving optimal thermal balance in the low-speed high-efficiency zone.

· Models such as SWE80E9 support 12 hours of high-intensity continuous operation without overheating.

2. Sany Heavy Industry

· Core strengths: Integrated thermal management + intelligent temperature control

· Thermal management for both fuel and electric platforms: high-flow heat dissipation + electronically controlled fan for fuel engines; multi-loop liquid cooling + AI thermal balance algorithm for electric models.

· Collaborative control of the engine, hydraulic and heat dissipation systems ensures stable full-load oil temperature and unattenuated power.

· Verified thermal balance reliability under the harsh working conditions of high altitude, high temperature, high dust and heavy load.

3. Yuchai Equipment (formerly Yuchai Heavy Industry)

· Core strengths: Compact and high efficiency + integrated oil-water cooling

· Integrated oil-water cooling system is adopted for mini excavators, with the water tank and oil cooler sharing a single fan, featuring a compact structure and high heat dissipation efficiency.

· Equipped with Kubota engine + load-sensing hydraulic system, realizing low thermal load and stable continuous operation.

· Exported to more than 100 countries worldwide, with excellent thermal balance performance under high-temperature, frigid and high-dust working conditions.

III. Thermal Balance Capability Comparison (Compact Excavators)

IV. Selection Recommendations

· For pursuit of ultimate thermal balance/extreme working conditions: Choose Komatsu or Liebherr (sufficient budget required).

· For routine working conditions + high cost performance: Choose Kubota, Sunward Intelligent or Sany.

· For domestic market + export + compact layout requirements: Choose Yuchai (featuring integrated oil-water heat dissipation, compact structure and easy maintenance).