Cost-Saving Power: Equipped with Cummins engine, delivering strong power with superior fuel efficiency and low emissions, significantly reducing your daily operating costs.
Responsive Hydraulics: Features a world-class main pump (Negative Flow Control) that adjusts instantly to your workload, ensuring fast, smooth, and energy-saving operations.
Precision & Reliability: The main valve and axial piston motors provide precise control and accurate positioning, perfect for fine grading and heavy lifting without hesitation.
Built to Last: The reinforced structure uses high-strength steel plates, offering exceptional durability and resistance to deformation, even in harsh mining environments.
Note: Specifications and designs are subject to change without notice.
| NK622 21.3 Ton Medium Hydraulic Excavator | ||
| Category | Item | |
| Engine | Brand & Model | Cummins 6BTAA5.9 |
| Rated Power | 133 kW | |
| Rated Speed | 2200 rpm | |
| Performance | Undercarriage Type | Crawler |
| Operating Weight | 21.3 Ton | |
| Bucket Capacity | 0.9-1.2 m³ | |
| Travel Speed (High / Low) | 5.8 / 3.2 km/h | |
| Swing Speed | 10.7 rpm | |
| Gradeability | 35° | |
| Working Range | Max. Digging Depth | 6525 mm |
| Max. Digging Reach | 9820 mm | |
| Max. Dumping Height | 6600 mm | |
| Working Condition Adaptation | Balanced performance, suitable for general working conditions such as earthmoving, municipal engineering, and residential construction. | |
Features:
NK622 is a 22-ton excavator engineered for heavy-duty applications. Powered by a 133 kW high-output Cummins engine and fitted with a large 1.2 m³ bucket, it delivers mining-grade digging force, higher loading efficiency and lower fuel consumption than peer models in the same class.
1. Powerful Digging Performance for Mining & Heavy-Duty Work
(Ideal for mine crushing, rock excavation and hard soil stripping)
Core Advantages:
Cummins 6BTAA5.9 Engine (133 kW): The ample power reserve prevents engine stalling during hammer operation or hard rock digging, with fast power response.
Reinforced Structure: This 22-ton machine comes with reinforced boom and arm. Paired with the 1.2 m³ large-capacity bucket, it achieves larger single digging volume and works reliably under heavy loads.
35° Gradeability: Excellent climbing performance enables easy relocation and operation in complex terrains such as mines and mountainous areas.
2. High Efficiency for Earthmoving & Cycle Operations
(Ideal for large-scale earthworks, highway construction and material loading)
Core Advantages:
1.2 m³ Bucket Capacity: Compared with the standard 1.0 m³ bucket on conventional 20–21 ton excavators, its bucket volume is increased by around 20%. It effectively cuts truck waiting time and boosts overall loading efficiency.
Negative Flow Control Hydraulic System: It precisely regulates oil flow according to joystick movement, ensuring smooth combined actions like travelling and boom lifting, and shortening work cycle time.
Travel Speed up to 5.8 km/h: Fast travelling speed allows quick on-site relocation and reduces non-working downtime.
3. Low Operating Cost & Excellent Fuel Economy
(Perfect for rental companies, cost-sensitive private operators and long-hour continuous operation)
Core Advantages:
Fuel-efficient Cummins Engine: Cummins engines are globally recognized for outstanding durability and low fuel consumption. For excavators running 8 to 10 hours daily, a fuel saving of 1–2 liters per hour translates into substantial annual profits.
Optimized Hydraulic Matching: The main pump from a world-renowned brand is perfectly matched with the engine power, eliminating unnecessary fuel waste and further cutting the operational cost per cubic meter of excavation.
4. Superior Durability & Low Failure Rate
(Suitable for construction in remote areas, sites with limited maintenance conditions and high-intensity shift work)
Core Advantages:
World-class Hydraulic Components (Main Pump & Main Control Valve): Premium hydraulic parts feature superior sealing and wear resistance, effectively avoiding common faults such as oil leakage and slow movement under high temperatures.
Swing Priority & Regeneration Circuit: These hydraulic designs deliver smoother operation and reduce hydraulic impact, extending the service life of cylinders and pipelines.
Easy Maintenance: Cummins engine spare parts are widely available worldwide for simple repair and routine maintenance, minimizing downtime risks.
