Longgong 450 fan pump For LG450 excavator

product parameters

Part No：Longgong 450 Fan Pump
Type：Variable Displacement Hydraulic Fan Pump
Applicable Equipment：Longgong LG450 Excavator
Control Mode：Pressure proportional variable control
Material：High-strength cast iron housing, alloy steel friction pairs, copper alloy valve plate, FKM fluorine rubber sealing rings
Surface Treatment：Precision machining, surface hardening, anti-corrosion coating
Drive Method：Engine driven
Nominal Working Pressure：25 MPa
Feature：Replacement fan pump, stable variable flow, strong anti-pollution, low internal leakage, direct fit, matched with supporting fan motor
Working Temperature：-25℃ ~ +115℃
Rated Rotation Speed：2200 rpm, Max allowable speed:2800 rpm
Shaft specification：Splined shaft
Net Weight：18 kg
Condition：New replacement part, 100% hydraulic bench test, flow & pressure & leakage inspection, test report available on request

・Longgong 450 variable hydraulic fan pump, aftermarket replacement, perfectly matched with supporting fan motor for Longgong LG450 excavator cooling system
Longgong 450 fan pump is designed for LG450 excavator cooling circuit. It provides variable flow hydraulic oil to drive cooling fan motor. Flow automatically adjusts according to system temperature, saving fuel consumption while maintaining good heat dissipation.
・Precision strengthened internal friction pairs, stable variable flow output
Alloy steel friction pairs and valve plate adopt precision machining and hardening treatment. It keeps stable flow output under pressure fluctuation. High volumetric efficiency reduces power loss during continuous operation.
・Full hydraulic bench inspection before delivery, high interchangeability for direct plug-and-play replacement
Each fan pump passes flow, pressure and durability hydraulic bench test. All mounting dimensions, port layout and spline shaft match OEM specifications. Direct installation without modification, shorten machine downtime and cut maintenance cost.
・Temperature-sensitive variable design, energy-saving, protect radiator and engine assembly
This fan pump adopts temperature feedback variable structure. It reduces flow when temperature is low to save power, and increases flow under heavy load for enhanced heat dissipation. It keeps cooling system stable and prevents engine overheating, ideal replacement for overhaul and daily maintenance of Longgong LG450 excavator.

FAQ 

Q1: Which machine is Longgong 450 fan pump suitable for?
A1: It is specially designed for Longgong LG450 excavator. Verify shaft size, oil port and installation dimension before placing order.

Q2: What is the main advantage of variable fan pump compared with fixed displacement pump?
A2: The variable fan pump adjusts flow automatically based on temperature. It consumes less power and fuel than fixed pump during low-load operation.

Q3: What causes the fan not speeding up under heavy load?
A3: Check pump internal wear and pressure setting. Also check whether hydraulic oil is deteriorated or filter is blocked.

Q4: What should be done before installing Longgong 450 fan pump?
A4: Clean the whole cooling hydraulic circuit, replace hydraulic oil and filter. Check the condition of matched fan motor and pipelines.

Q5: How to extend service life of excavator variable fan pump?
A5: Control hydraulic oil cleanliness strictly. Avoid long-time overpressure operation. Regularly inspect seal condition and replace filter on schedule.

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