179-9778 Hydraulic Fan Motor for Caterpillar 325C excavator

product parameters

Part No：179-9778
Applicable Machine：Caterpillar 325C, also fits CAT322C, M325C Excavator
Motor Structure：Fixed displacement vane motor
Displacement：16 cc/rev
Main Material：High-strength cast iron housing, alloy steel shaft, high precision vane assembly, fluororubber sealing components
Rated Working Pressure：200 bar
Max Instantaneous Peak Pressure：240 bar
Working Rotation Speed Range：0 ~ 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：200mm ×133mm ×102mm
Shaft Specification：Splined drive shaft
Interface Specification：Standard hydraulic oil port, inlet port Φ20mm, outlet port Φ16mm
Accessories：Comes with complete matching sealing kits (O-rings, backup rings)
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.

• **Sensitive speed response, matched cooling power**
Rotating speed responds quickly to hydraulic pressure variation. It automatically raises fan speed when engine heat load rises and slows down at low temperature. Reduces parasitic power loss of the 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 vanes, rotor and output shaft adopt alloy steel 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 motor 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 motor undergoes strict full-load bench testing of speed curve, pressure 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 motors.
• **High pressure impact resistance & low noise operation**
High-strength cast iron housing effectively absorbs vibration and resists pressure shock. Optimized vane structure reduces flow pulsation and running noise. It maintains quiet and stable operation even under frequent pressure spikes, avoiding harsh knocking noise transmitted into the cab.

FAQ 

Q1: What equipment is the 179-9778 fan motor suitable for?
A1: It fits Caterpillar 325C excavator cooling hydraulic system, also compatible with CAT322C, M325C. It is fully interchangeable with part number 1799778 and 191-5611. Please confirm machine model before installation to avoid mismatch, wrong model may lead to poor cooling performance.

Q2: What failures can this fan motor solve?
A2: It can effectively repair common cooling system faults: engine overheating, fan rotating slowly, fan not spinning, motor abnormal knocking noise, high hydraulic oil temperature. These symptoms are usually caused by aging, vane wear or internal leakage of original fan motor.

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, fan blade condition 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 matching fan pump condition, to avoid secondary damage caused by pipeline contaminants. Clean hydraulic system is critical for fan motor service life.

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