The SEM 660D is a 6-ton class heavy-duty wheel loader manufactured by SEM (Shandong Engineering Machinery), a Caterpillar-owned brand based in China. This model features a standard bucket capacity of 3.3-5.5 cubic meters with a rated payload of 6,000 kg and operating weight of 20,000 kg. Powered by a Weichai WD10G220E21 or WD10G240 engine delivering 178 kW at 2,000 rpm with National III emission compliance, it is designed for demanding mining and heavy construction applications with dimensions of 8,414×3,370×3,458 mm .
1.Powerful and Efficient PerformanceThe Weichai WD10G220E21 engine generates 178 kW with low-speed characteristics for better fuel consumption and lower noise. Its large displacement delivers high torque reserve and strong power for heavy loading operations. The National III emission compliant engine with electromagnetic fan ensures efficient cooling and reduced fuel consumption .
2.Durable Heavy-Duty StructureReinforced chassis and heavy-duty axles provide exceptional durability in rigorous mining environments. Large wheelbase and track width ensure stability when handling 6-ton loads at full height. High-strength materials and robust construction extend service life under continuous heavy loads .
3.Comfortable and Productive OperationThe spacious ROPS-certified cab features ergonomic controls and suspension seating for operator comfort during long shifts. Fast hydraulic cycle time and excellent modulation performance raise productivity in repetitive loading cycles. Convenient maintenance access with three-stage fuel filtration extends service intervals and reduces downtime .
This loader excels in large-scale mining operations including coal, iron ore, and aggregate loading where 6-ton capacity and high durability are essential. It serves reliably in quarry production, port cargo handling, and major earthmoving projects requiring continuous heavy lifting. The SEM 660D is equally capable in municipal waste management, road construction, and material stockpiling operations with various quick-change attachments available, making it a cost-effective solution for mining contractors, quarry operators, and heavy construction fleets worldwide .
