448-9705 Fan Pump For CAT 374F excavator

448-9705 Fan Pump For CAT 374F excavator Featured Image
  • 448-9705 Fan Pump For CAT 374F excavator

Short Description:

204-2578 variable axial plunger pump is aftermarket replacement part for Caterpillar D8R and D8T large crawler bulldozer.

Product Detail

Product Tags

description

448-9705 fan pump serves as the core power component of independent cooling hydraulic circuit for CAT374F excavator, driven by engine power take-off. It converts mechanical power into adjustable pressurized hydraulic oil to drive fan motor. The built-in electronic proportional control valve dynamically changes pump displacement. During heavy digging under high ambient temperature, pump increases flow to raise fan speed and enhance heat dissipation; when temperature drops under light load, pump reduces displacement to cut power consumption and lower fuel burn. Internal components including plungers, cylinder block, valve plate and slippers are manufactured from high-strength alloy steel, processed with precision grinding and surface hardening treatment. Cast iron housing adopts stress relief annealing to eliminate casting residual stress, resisting strong vibration and particle contamination in open-pit mines.

product parameters

Part No：448-9705
Product Type：Variable Displacement Axial Piston Fan Pump
Applicable Equipment：CAT 374F Mining Excavator, C15 Engine
Control Mode：Electronic Proportional Temperature Control
Displacement：48 cc/rev
Nominal Working Pressure：27 MPa (270 bar)
Max Instantaneous Peak Pressure：32 MPa (320 bar)
Rated Rotation Speed：2200 rpm
Max Allowable Rotation Speed：2500 rpm
Working Medium：ISO VG46 Anti-wear Hydraulic Oil
Working Temperature Range：-22℃ ~ +118℃
Main Material：Cast iron housing, high-strength alloy steel internal parts, FKM fluorine rubber seal
Surface Treatment：Precision grinding, surface hardening, stress relief annealing, anti-rust coating
Shaft Specification：Original standard splined shaft
Interchangeability：1:1 OEM interchangeable, direct bolt-on installation
Product Condition：Brand new aftermarket part, 100% hydraulic bench tested
Packaging：Independent anti-rust packaging + export wooden case

advantage

- High-precision electronic proportional response for large excavator thermal management
Electronically controlled proportional valve delivers fast and linear flow adjustment following temperature signals. It precisely matches fan speed according to real-time heat load, avoiding frequent fan on/off hunting in fluctuating mine temperature.
- Wide high-temperature working margin for tropical open-pit mine
Extra thermal design margin reserved for high ambient temperature operation. It maintains stable cooling performance even under 50℃+ ambient temperature in tropical mines, preventing engine overheat during continuous heavy digging.
- Integrated solenoid valve structure, simplified piping layout
Solenoid valve integrated on pump body, reduces extra external pipe connections. It lowers the risk of joint leakage and simplifies installation and troubleshooting inside the compact engine compartment of CAT374F.
- Soft start flow control, reduces hydraulic shock to fan motor
Smooth ramp-up flow control when fan starts, eliminating sudden pressure spike and protecting fan motor bearings and seals from startup hydraulic impact.
- Full thermal cycle bench test under simulated tropical mine condition
Each pump passes continuous thermal cycle test simulating high-temperature open pit mine, verifying proportional control stability under long-hour heavy excavation heat load.

FAQ 

Q1: Which machine does 448-9705 fan pump fit?
A1: This hydraulic fan pump is designed for CAT374F mining excavator with C15 engine, dedicated for engine cooling hydraulic circuit. It can also fit CAT390F, please confirm machine serial number before purchase.

Q2: What is the main function of this fan pump?
A2: It provides variable hydraulic flow to drive cooling fan motor. Controlled by electronic proportional signal, it dynamically adjusts fan speed to stabilize engine coolant temperature and hydraulic oil temperature.

Q3: What symptoms indicate fan pump failure?
A3: Typical signs: engine overheating under heavy digging, fan fails to speed up at high temperature, fan speed unstable and fluctuating, proportional response delay, pump abnormal noise and shaft seal oil leakage.

Q4: What inspections should be done before installing new fan pump?
A4: Inspect fan motor, temperature sensors, proportional solenoid valve and filter elements. Fully flush cooling hydraulic tank and pipelines to remove metal debris. Replace deteriorated hydraulic oil before assembly.

Q5: Why excavator still overheats after fan pump replacement?
A5: The fault may not be caused by fan pump. Check temperature sensor damage, radiator clogging, fan motor stuck, blocked filter or trapped air inside cooling circuit. Air bleeding must be completed after installation.

warehouse

We have built four spare parts warehouses in Xuzhou, Jining, Kunshan and Changsha to provide customers from all over the world with a variety of high-quality spare parts. We can basically ship self-provided spare parts within three days after confirming the order. If the spare parts need to be adjusted or processed, they will be shipped within 7-30 days.

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our warehouse

Pack and ship

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