Hydraulic Pump 708-3S-00313 Fan Motor Komatsu

Product Overview

708-3S-00313 hydraulic fan motor is OEM validated heavy-duty cooling replacement part exclusively engineered for Komatsu PC40MR-1 and PC45MR-1 compact mini excavators.

As the core power component of radiator cooling circuits for these two widely used compact excavator models, this electro-proportional hydraulic fan motor dynamically adjusts fan rotational speed in response to real-time shifts of engine coolant and internal hydraulic oil temperatures. It delivers steady heat dissipation for diverse small construction assignments, including municipal narrow trench excavation, residential landscape upgrades, light foundation digging, confined indoor renovation and scattered rural farmland earthworks. Adaptive speed regulation prevents engine thermal overload amid frequent start-stop operation cycles, meanwhile cutting unnecessary fuel consumption by lowering fan rotation during short idle intervals that commonly appear on small construction sites.

Product Highlights

✅ Dual-Model Optimized Proportional Speed Control

Compact built-in DC12V proportional solenoid delivers smooth stepless speed tuning matching the operational features of PC40MR-1 and PC45MR-1. Fan speed automatically rises during continuous digging for sufficient cooling output, and drops throughout frequent work pauses to reduce idle power loss and regular fuel expenditure.

✅ Space-Saving OEM Mount Layout for Narrow Engine Bays

Downsized reinforced mounting flanges, finely threaded hydraulic ports and precision splined shafts perfectly adapt to the constrained installation space of the two excavator variants. No on-site frame cutting or pipeline remodeling is required during replacement, greatly shortening downtime in dense urban and residential construction zones.

✅ Compact Shockproof Cast Iron Shell

Thickened mini cast iron casing absorbs subtle recurring vibration caused by light digging impacts and bumpy narrow-path travels, avoiding casing cracks and loosening of delicate internal hydraulic components during intensive daily operation cycles.

✅ Multi-Environment Dust and Mud Resistant Seal Design

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

✅ Multi-Step Factory Quality Control Procedure

All finished products pass a 22MPa 30-minute pressure retention leak test, accurate linear speed calibration and 2.5 hours of continuous full-load aging screening. Hidden manufacturing defects get eliminated before delivery to minimize repeated on-site maintenance work.

✅ Dual Procurement Selections for Different Budget Demands

Factory-new units satisfy official maintenance standards of authorized Komatsu service centers; remanufactured versions fully swap out worn internal hydraulic core components, bringing prominent cost advantages for wholesalers stocking bulk compact excavator spare inventory.

✅ Simplify Warehouse Stock Planning

One spare item fits two mainstream mini excavator models of Komatsu, cutting down required SKU quantities, simplifying stock classification and reducing capital locked into scattered small spare inventories.

✅ Precision Dynamic Rotor Balancing

Mini internal rotating assemblies receive professional dynamic balancing treatment to mitigate vibration and operational noise, protecting 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.

✅ Excellent Cross-Border Shipping Adaptability

Compact overall dimensions decrease international freight costs, shock-absorbing industrial packaging performs reliably in sea, air and parcel express transportation. Tiered bulk purchase discounts are available, backed by standard 6-month worldwide warranty excluding man-made damage and faulty installation.

Condition: Brand new

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