179-9778 E325C Fan Pump & Fan Motor

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Product details

179-9778 E325C Fan Pump & Fan Motor

A structured breakdown coveringtechnical specifications, compatibility, procurement critical points, and troubleshootingfor operational excellence.

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I. Core Identification

【表格】

Parameter Details

Part Number 179-9778 (Caterpillar® OEM number or universal aftermarket reference)

Compatible Model Caterpillar E325C Hydraulic Excavator (Production years: 1998–2005; partial compatibility with derivatives)

Component Structure Hydraulic Fan Pump + Hydraulic Fan Motor (Integrated or modular design varies by model)

Functional Role Drives excavator cooling fan to maintain engine/hydraulic oil temperature within safe range (≤105°C)

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II. Technical Specifications

1. Fan Pump (Hydraulic Fan Pump)

• Type:Gear Pump(Variable displacement piston pumps in premium models)

• Displacement:12.5 cc/rev(±5% tolerance; refer to OEM manual for exact values)

• Operating Pressure:180–220 bar(Peak ≤250 bar to avoid seal failure)

• Speed Range:1,500–2,800 RPM(Linked to engine RPM)

• Port Specifications:

• Inlet: SAE 10 thread (G 3/4")

• Outlet: SAE 12 thread (G 1")

• Case Drain: SAE 6 thread (G 1/4")

2. Fan Motor (Hydraulic Fan Motor)

• Type:Orbital Motor(High-torque, low-speed) orGear Motor(Budget-friendly)

• Displacement:16 cc/rev(Matched with pump displacement for flow balance)

• Rated Torque:45–60 Nm(≥55 Nm required for fans ≥800mm diameter)

• Max Speed:3,200 RPM(Exceeding may cause fan imbalance)

• Seal Design:Lip seal + floating bearing(Temperature resistance up to 120°C)

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III. Compatibility Verification

1. Hardware Fitment

• Mounting Dimensions:

• Pump mounting hole spacing:135±0.2 mm(Diagonal)

• Motor flange size:Φ180 mm(4-hole, M10×1.5 threads)

• Hydraulic System:

• Must interface with E325C’sMain Control Valve(PN: 159-8745) cooling circuit pressure output

• Case drain backpressure ≤2.5 bar (Higher values risk pump cavitation)

2. Electrical Compatibility

• Sensor Interfaces:

• Temperature sensor (PT100): 3-wire, 100Ω@0°C

• Pressure switch (optional): 160 bar setpoint, 24V/5A contact rating

• Control Logic:

• Fan speed regulated by ECU based onengine coolant temp, hydraulic oil temp, A/C demand

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