200-3406 Hydraulic Fan Pump for Caterpillar 325C excavator

product parameters

Part No：200-3406
Applicable Machine：Caterpillar 325C Excavator
Pump Structure：External gear pump, fixed displacement
Displacement：28 cc/rev
Main Material：High-strength cast iron pump housing, alloy steel gear pair, copper alloy sliding bearing, fluororubber sealing components
Rated Working Pressure：210 bar
Max Instantaneous Peak Pressure：230 bar
Working Rotation Speed Range：500 ~ 2800 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：212mm ×156mm ×142mm
Net Weight：Approx.12.6kg
Interface Specification：Standard hydraulic oil port, inlet port Φ22mm, outlet port Φ16mm
Accessories：Comes with complete matching sealing kits (O-rings, backup rings)
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 gear pair 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.
• **Full bench testing for every unit, excellent performance consistency**
Each finished pump undergoes strict full-load bench testing of flow, pressure curve and internal leakage before shipment. Strict machining tolerance control ensures uniform performance across batches. Individual performance deviation is kept minimal. It is ideal for bulk maintenance and fleet overhaul, avoiding inconsistent cooling effect from different replacement pumps.

FAQ 

Q1: What equipment is the 200-3406 fan pump suitable for?
A1: It fits Caterpillar 325C excavator cooling hydraulic system. It is fully interchangeable with part number 2003406. 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, 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 is the product warranty and scope of exemption?
A4: 12-month professional warranty under standard installation and normal use. Damage caused by contaminated hydraulic oil, oil shortage, wrong installation torque, clogged filter, unauthorized disassembly & modification or mechanical failure is not covered by warranty. Warranty is only valid following proper operation.

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