490B-41100 Cooling Fan Blade for Xinchai 490BPG Forklift Engine

The 490B-41100 cooling fan blade is an OEM-spec engine cooling fan for Xinchai 490BPG 4-cylinder diesel engines used in HELI CPCD25-CPCD35 and Hangcha 2.5T-3.5T diesel counterbalance forklifts. The fan blade is the primary air-movement device in the engine cooling system — it pulls ambient air through the radiator core at a flow rate governed by engine RPM, creating the pressure differential that forces heat rejection from the radiator fins to the atmosphere. Unlike an automotive engine where the vehicle forward speed provides significant ram-air cooling through the grille at travel speeds, a forklift operates at 10-20 km/h maximum and spends 60-80% of its duty cycle stationary or near-stationary during lifting, stacking, and loading operations. During stationary operation at rated load with the engine at 2,200-2,400 RPM, the fan blade is the sole source of cooling airflow — the radiator receives zero ram-air contribution — and the fan must move approximately 1.5-2.5 cubic meters of air per second through the radiator core to maintain coolant temperature within the 82-95°C operating range. When a fan blade fails — typically from a blade root fatigue crack that propagates across the blade and causes a blade fragment to separate at engine speed — the resulting imbalance can tear the entire fan assembly from the water pump shaft, destroying the radiator core, the fan shroud, the radiator hoses, and the water pump bearing in a single catastrophic event that disables the forklift and requires replacement of the entire front-end cooling package.

The 490B-41100 fan blade is manufactured from injection-molded glass-reinforced polypropylene (PP-GF) — selected for its combination of high tensile strength at the blade root where centrifugal stress is concentrated, fatigue resistance to the cyclic bending loads experienced 50-100 million times over the fan service life, and low density that minimizes the rotational inertia and reduces the load on the water pump bearing compared to the steel fan blades used on earlier-generation 490 engines. The blade profile features a swept airfoil cross-section with a variable pitch angle optimized for maximum airflow at the engine governed speed of 2,400 RPM — the pitch angle is steeper at the blade hub where linear velocity is lower and shallower at the blade tip where velocity is highest, producing a uniform airflow velocity profile across the radiator core face. The six-blade configuration balances the airflow requirement against the noise output — additional blades increase airflow but also increase the fan noise level, and the six-blade design represents the noise-airflow compromise for forklift applications where operator hearing protection is a consideration. The central hub incorporates a precision-bored pilot hole and four bolt holes on a standard PCD (pitch circle diameter) that matches the Xinchai 490BPG water pump flange bolt pattern.

Direct bolt-on replacement for Xinchai 490BPG, 490BPG-1, 490BPG-2, and related 490-series diesel engines. Compatible with HELI CPCD25, CPCD30, CPCD35, and Hangcha CPCD25-CPCD35 diesel forklifts using the 490BPG engine. For the complete engine cooling system including water pumps, fan clutches, radiators, and fan shrouds, browse our forklift fan blade category.

Technical Specifications

• OEM / Part Number: 490B-41100 (Xinchai)
• Type: 6-blade engine cooling fan, injection-molded
• Material: Glass-reinforced polypropylene (PP-GF)
• Blade Profile: Swept airfoil, variable-pitch from hub to tip
• Airflow: 1.5-2.5 m³/s at 2,400 RPM governed speed
• Hub Mounting: 4-bolt pattern, precision pilot bore
• Engine Application: Xinchai 490BPG, 490BPG-1, 490BPG-2 4-cylinder diesel
• Rotational Direction: Clockwise (as viewed from front of engine)
• Fitment: HELI CPCD25-CPCD35, Hangcha CPCD25-CPCD35
• Quality: OEM-spec replacement

Compatible Forklift Models (490BPG Engine)

Each fan blade ships with the mounting bolt holes protected by plastic caps. Before installation, inspect all six blades for impact damage, surface cracks, or white stress-whitening marks at the blade roots — stress-whitening in polypropylene indicates the material has been plastically deformed and the blade has lost a significant percentage of its fatigue life. Align the hub pilot bore with the water pump flange pilot before installing the four mounting bolts — forcing the fan onto the pilot by tightening the bolts with the fan misaligned will crack the polypropylene hub at the bolt holes. Torque the four mounting bolts to 10-12 Nm in a criss-cross pattern — the polypropylene hub has lower compressive strength than the steel water pump flange, and overtightening will crack the hub at the bolt bosses. After installation, rotate the engine by hand (wrench on the crankshaft pulley bolt) through two complete revolutions to verify the fan blades clear the radiator shroud by a minimum of 10mm at all points — the polypropylene blades flex forward under aerodynamic load at high RPM, and insufficient static clearance will cause the blade tips to contact the shroud, generating a distinctive “ticking” noise that escalates to blade tip erosion and eventual blade failure. During each 250-hour service, inspect the fan blade leading edges for pitting or erosion from airborne debris — eroded leading edges create turbulence that reduces airflow by 5-10% and concentrates bending stress at the erosion pits. Never attempt to repair a cracked or damaged fan blade — the rotational energy of a fan blade at 2,400 RPM is sufficient to propel a detached blade fragment through the steel radiator shroud, the radiator core, and the forklift grille with lethal force. For engine cooling system inspection procedures, consult Baldwin Filters. Kingstream stocks 490B-41100 cooling fan blades for same-day dispatch — worldwide shipping with online tracking.