Hydraulic Pump 708-1S-04280 Fan Motor Komatsu

Product Overview

708-1S-04280 hydraulic fan motor is OEM-standard cooling replacement part exclusively designed for Komatsu fifth-generation wheel loaders WA380-5, WA400-5, WA430-5, WA470-5 and WA480-5.

As the essential power component of radiator cooling loops for these loaders, this electro-proportional hydraulic fan motor adjusts fan rotation speed dynamically based on real-time engine coolant and hydraulic oil temperature. It delivers stable heat dissipation throughout repeated loading, hauling and dumping operations at quarries, mixing plants, ports and earthwork construction sites, effectively preventing engine overheating during long daily shifts and cutting unnecessary fuel consumption via intelligent adaptive speed control.

Product Highlights

✅ Adaptive Proportional Stepless Speed Control

Built-in DC12V proportional solenoid flexibly adjusts fan rotating speed. It raises speed under heavy hot loading conditions and reduces speed during light-duty periods, cutting parasitic power draw from the engine and optimizing fuel economy.

✅ Precise OEM Mounting Compatibility

Mounting flanges, threaded hydraulic ports and output splines fully match factory parameters. Field replacement can be carried out quickly without drilling, welding or pipe remodeling, shortening loader downtime on busy construction sites.

✅ Heavy-Duty Vibration-Resistant Shell

Monolithic thick cast iron casing absorbs continuous mechanical vibration generated by bucket lifting cycles and bumpy road travel, preventing shell cracks and displacement of delicate internal precision components.

✅ Multi-Layer Dustproof & Mudproof Seal Design

Tiered fluorine rubber oil seals paired with external dust gaskets adapt high-dust quarry yards, concrete batching stations and muddy construction zones, blocking abrasive grit to extend seal service life significantly.

✅ Multi-Stage Factory Quality Screening

All finished motors undergo pressure holding leak tests, speed accuracy calibration and extended full-load aging trials, filtering defective batches to reduce subsequent repair frequency and maintenance expenditure.

✅ Dual Procurement Choices

Brand-new full assemblies meet rigorous maintenance standards of large-scale loader fleets; premium remanufactured units renew all worn internal core structures to deliver obvious cost advantages for bulk wholesale orders.

✅ Broad Coverage Across Five Popular WA-5 Models

A single spare part is compatible with five mainstream fifth-generation WA wheel loader variants, streamlining spare part categorization and warehouse stocking work for distributors.

✅ Dynamically Balanced Rotation Performance

Precision-ground internal rotating parts receive dynamic balancing treatment, lowering operational vibration and noise while safeguarding fragile radiator fins and adjacent hydraulic piping.

✅ Extend Whole-Machine Service Life

Stable thermal regulation keeps engine and major hydraulic assemblies within optimal working temperature ranges, slowing aging of pump internals, rubber hoses and peripheral sealing pieces under cyclic heavy workloads.

✅ Complete Global Logistics & After-Sales Arrangement

Sea freight, air freight and international express delivery are all accessible worldwide; tiered wholesale discounts apply to bulk purchases with standardized six-month global warranty coverage.

Condition: Brand new

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