259-0815 Hydraulic Fan Pump for Caterpillar 330D excavator

product parameters

Part No：259-0815
Applicable Machine：Caterpillar 330D,330DL,336D Excavator
Pump Structure：Variable displacement piston pump
Displacement：28 cc/rev
Main Material：High-strength cast iron pump housing, hardened piston & cylinder block assembly, copper alloy sliding bearing, fluororubber sealing components
Rated Working Pressure：240 bar
Max Instantaneous Peak Pressure：280 bar
Working Rotation Speed Range：600 ~ 3000 rpm
Recommended Operating Hydraulic Oil：AW32 / AW46 anti-wear hydraulic oil
Adaptable Temperature：-20℃ ~ +120℃
Allowable Oil Viscosity Range：10 ~ 500 mm²/s
Overall Dimension：230mm ×168mm ×152mm
Interface Specification：Standard hydraulic oil port, inlet port Φ25mm, outlet port Φ20mm
Testing Standard：100% full-load bench flow, pressure and internal leakage calibration test
Packaging：Independent anti-rust packaging + neutral export carton
Storage Requirements：Dry indoor storage environment, relative humidity ≤75%, avoid moisture, dust, corrosive gas and direct sunlight. Long-term storage needs periodic anti-rust inspection.

• **Stable hydraulic output, reliable temperature control for heavy-duty working conditions**
Consistent hydraulic flow is maintained under sudden load fluctuations. Even under long continuous heavy loads in dusty, high-temperature construction sites, the pump delivers steady power to the cooling fan, keeping engine temperature within the safe working window. It effectively eliminates the risk of engine overheating, cylinder scuffing and power derating caused by insufficient cooling during heavy-duty excavation, hauling and climbing operations.
• **Precise flow regulation, lower energy consumption**
Hydraulic flow matches cooling demand dynamically. When the engine is cold or operating under light load, the fan consumes less power, reducing parasitic power loss of the main hydraulic system. Less heat buildup inside the hydraulic circuit helps cut fuel consumption, reduce overall machine running costs and improve fuel economy for long-hour jobs.
• **Premium wear-resistant core components, strong anti-pollution capacity**
The piston, cylinder block and sliding bearings are made of high-alloy steel and copper alloy with ultra-precision grinding treatment. The surface hardness and wear resistance are greatly improved. It can tolerate fine solid particles mixed in hydraulic oil, slowing down abrasive wear of internal parts. This reduces the risk of premature pump failure caused by contaminated oil and greatly extends service life, minimizing unexpected downtime of excavators.
• **Direct replacement design, saving maintenance time**
Fully consistent with OEM mounting dimensions, flange position and oil port layout. Plug-and-play installation without cutting, welding or modifying hydraulic pipelines. It greatly shortens on-site overhaul time, cuts labor cost and reduces machine idle period. Convenient for field repair in remote construction sites.

FAQ 

Q1: What equipment is the 259-0815 fan pump suitable for?
A1: It fits Caterpillar 330D excavator cooling hydraulic system, also compatible with 330DL,336D. It is fully interchangeable with part number 2590815 and 295-9674. Please confirm machine model before installation to avoid mismatch, wrong model may lead to poor cooling performance.

Q2: What failures can this fan pump solve?
A2: It can effectively repair common cooling system faults: engine overheating, fan rotating slowly, fan no rotation, pump abnormal knocking noise, high hydraulic oil temperature. These symptoms are usually caused by aging, plunger wear or internal leakage of original fan pump.

Q3: Does it need adjustment after installation?
A3: After installation, bleed air from hydraulic circuit fully. Normally it can work directly. If temperature still abnormal after installation, inspect relief valve setting and radiator blockage to get better cooling effect.

Q4: What pre-installation preparations are required?
A4: Clean hydraulic pipeline and radiator thoroughly to remove sludge and impurities; replace brand-new hydraulic filter and sealing kit; check main hydraulic pump condition, to avoid secondary damage caused by pipeline contaminants. Clean hydraulic system is critical for fan pump service life.

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