Hydraulic Pump 708-3S-00522 Fan Motor Komatsu

Product Overview

708-3S-00522 hydraulic fan motor is OEM-certified heavy-duty cooling replacement part custom-built for Komatsu PC40MR and PC50MR compact mini excavators.

As the indispensable power unit for the radiator cooling assembly of the two excavator models, this electro-proportional hydraulic fan motor dynamically modulates fan rotational speed in accordance with real-time fluctuations of engine coolant temperature and internal hydraulic oil temperature. It delivers stable heat dissipation for diverse light construction assignments, including narrow municipal trench excavation, residential landscape refurbishment, small-scale foundation digging, confined indoor renovation and scattered rural farmland earthmoving. Adaptive speed control effectively prevents engine thermal overload amid frequent start-stop operation cycles, and cuts superfluous fan rotation during short idle intervals to lower overall fuel consumption on compact job sites.

Product Highlights

✅ Dual-Model Adaptive Proportional Speed Regulation

Compact built-in DC12V proportional solenoid delivers smooth stepless speed tuning matching the operating habits of PC40MR and PC50MR. Fan speed automatically rises during continuous heavy digging to boost cooling efficiency, and drops during frequent work pauses to curb idle power waste and regular fuel costs.

✅ Space-Optimized OEM Mount Layout

Downsized reinforced mounting flanges, finely threaded hydraulic ports and precision splined shafts perfectly adapt to the narrow engine bay installation space of both excavator models. No on-site frame cutting or pipeline remodeling is required during replacement, drastically shortening downtime at dense urban and residential construction zones.

✅ Shock-Resistant Mini Cast Iron Casing

Thickened compact cast iron housing absorbs subtle recurring vibration generated by light digging motions and bumpy narrow-path travels, preventing casing cracks and loosening of delicate internal hydraulic components during intensive daily operation cycles.

✅ Multi-Site Dust, Soil and Mud Resistant Seal Structure

Stacked premium fluorine rubber oil seals paired with compact outer dust gaskets block concrete dust, loose gardening dirt and wet trench muck, slowing seal degradation in courtyard landscaping projects, narrow municipal trenches and damp rural construction plots.

✅ Multi-Step Factory Quality Assurance Workflow

All finished products undergo a 22MPa 30-minute pressure holding leak test, accurate linear speed calibration and 2.5 hours of continuous full-load aging screening. Potential manufacturing flaws get eliminated before shipment to reduce repeated field maintenance demands.

✅ Dual Procurement Solutions for Differing Budget Needs

Factory-new units meet strict official maintenance standards for authorized Komatsu service centers; remanufactured versions thoroughly replace all worn internal hydraulic core components, bringing prominent cost advantages for wholesalers stocking bulk compact excavator spare inventory.

✅ Simplify Warehouse SKU Planning

A single spare matches two mainstream Komatsu mini excavator models, simplifying stock categorization and decreasing capital locked into scattered small-sized spare inventories.

✅ Precision Dynamic Balancing for Internal Rotors

Mini rotating internal assemblies receive professional dynamic balancing treatment to mitigate vibration and operational noise, safeguarding fragile compact radiator fins inside cramped engine compartments.

✅ Prolong Service Life of Compact Hydraulic Loops

Stable thermal stabilization keeps small-displacement engines and matched hydraulic modules within optimal temperature bands, decelerating ageing of tiny pump internals, slim rubber hoses and peripheral seals under frequent start-stop working rhythms.

✅ Optimized Cross-Border Shipping Performance

Compact overall dimensions lower international freight expenditure, shock-absorbing industrial packaging remains stable throughout sea, air and parcel express transportation. Tiered bulk discounts are available, covered by standard 6-month worldwide warranty excluding man-made damage and faulty installation.

Condition: Brand new

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