Engine assy 404D-22 used for Perkins engine spare parts

Engine Assy 404D-22 Perkins for Mini Excavator - High-Reliability Complete Diesel Engine Assembly

High-Quality Engine Assy 404D-22 is a complete, OEM-compatible diesel engine assembly, specifically designed and calibrated for Perkins 404D-22 series. It is widely applied to mini excavators, serving as one of the most critical power core components for small-scale construction machinery.

As a 4-cylinder inline diesel engine assembly, it integrates all core components (cylinder block, cylinder head, crankshaft, fuel system, cooling system, lubrication system, and electrical system) into one complete unit. This design ensures direct replacement and immediate operation, saving time and labor for maintenance.

Tailored to the working characteristics of mini excavators, this engine assembly delivers stable power, excellent fuel efficiency, and strong adaptability to harsh construction environments. It is an ideal replacement part for mini excavator maintenance, repair, and equipment upgrading.

It is part of Perkins’ 400 series, which is renowned for its compact design, optimized performance, and proven reliability in off-highway applications. This makes it perfectly suited for the demanding work of mini excavators in urban, rural, and industrial construction sites.

Product Overview & Compatibility

Engine Assy 404D-22 is a complete Perkins diesel engine assembly, engineered to match the exact specifications of Perkins 404D-22 series. Its primary application is for 1-6 ton class mini excavators—the most common size for small-scale digging, landscaping, and light construction tasks.

It is a direct OEM replacement assembly, compatible with various mini excavator brands that adopt Perkins 404D-22 engines. These include but are not limited to Caterpillar, JCB, Bobcat, Doosan DX75, and domestic mini excavator models such as BHL 50Z, 51R, 55Z.

This complete engine assembly eliminates the need for separate component assembly, ensuring perfect matching of all internal parts. It solves common issues such as difficult starting, insufficient power, excessive fuel consumption, and abnormal noise caused by worn or damaged engine components.

Designed with a compact structure, it perfectly fits the limited installation space of mini excavators while maintaining the original engine’s performance parameters and installation dimensions. The 404D-22 engine assembly is available in both naturally aspirated (NA) and turbocharged (T) versions, catering to different power demands of mini excavators in various working scenarios.

Core Features & Technical Advantages

• Optimized Power Output for Mini Excavators: This 4-cylinder inline diesel engine assembly features a displacement of 2.216L (bore 84mm × stroke 100mm), with flexible power output to match mini excavator needs.

• Naturally aspirated models deliver up to 35.7kW (48hp) at 2600rpm, while turbocharged versions can reach 66hp at 2800rpm with a torque of 208Nm at 1800rpm.

• The 4-stroke cycle design ensures strong low-speed torque, enabling the mini excavator to work stably even under heavy load conditions (such as digging hard soil or lifting heavy materials). This improves work efficiency and reduces operational fatigue.

• Its maximum operating speed is 3000rpm, perfectly aligned with the working speed requirements of mini excavator hydraulic systems.

• High Fuel Efficiency & Low Emissions: Equipped with a mechanically controlled built-in fuel injection pump and indirect injection system, it achieves precise fuel delivery.

• The fuel consumption is 237-240g/kw·h at 75% of prime power, effectively reducing fuel costs for long-term operation.

• The engine complies with EU Stage IIIA / U.S. EPA Tier 4 Interim emission standards and can use biodiesel with a concentration of up to 20%.

• It reduces harmful emissions (NOx, particulate matter), meeting environmental protection requirements for construction sites. Even in noise-sensitive urban areas, it performs well thanks to its low noise design (with optional low-noise fan to reduce noise by an additional 2 dBA).

• Durable & Rugged Construction: The engine block is made of high-strength cast iron, with a forged steel crankshaft and replaceable wet cylinder liner, enhancing wear resistance and shock resistance.

• The cylinder head adopts a reasonable structure with 2 valves per cylinder (inlet and exhaust), with a valve lash setting of 0.20mm for both inlet and exhaust. This improves ventilation efficiency and heat dissipation performance.

• All internal components (connecting rods, pistons, piston rings) are made of high-quality materials and undergo strict heat treatment, ensuring a service life of over 10,000 operating hours.

• A standard 500-hour service interval further reduces overall ownership costs, making it adaptable to the dusty, vibrating working environment of mini excavators.

• Complete Assembly & Easy Installation: As a full engine assembly, it integrates all necessary components (cylinder block, cylinder head, crankshaft, fuel system, cooling system, lubrication system, and electrical system) into one complete unit, requiring no additional component assembly or adjustment. It matches the original installation dimensions and interface standards of mini excavators, allowing direct hoisting and installation, greatly shortening maintenance time and reducing labor costs. Even for on-site maintenance personnel, the installation process is simple and efficient, ensuring the mini excavator can quickly resume work. The assembly also includes all essential accessories (such as water pump, oil pump, alternator, and starter), eliminating the need for separate purchases and ensuring perfect compatibility between components.

• Compact Design & Strong Adaptability: Tailored for mini excavators with limited installation space, the 404D-22 engine assembly features a compact, lightweight design (net weight of approximately 240kg) without sacrificing performance. It adopts a closed-loop cooling system and a high-efficiency air filter, effectively resisting dust, moisture, and extreme temperatures—adapting to various harsh working environments such as construction sites, farmland, mountainous areas, and urban road maintenance. The engine’s vibration damping design reduces the impact of vibration on the mini excavator’s body, extending the service life of both the engine and the excavator itself.

Technical Specifications