Hydraulic Pump 708-1W-21150 Fan Motor Komatsu

Product Overview

708-1W-21150 hydraulic fan motor is OEM-certified heavy-duty cooling replacement part tailor-made for Komatsu PC75UU-3 and PC78US-5 compact short-tail excavators.

Acting as the essential power component for radiator cooling assemblies of these two narrow-swing excavator models ideal for confined workspaces, this electro-proportional hydraulic fan motor dynamically adjusts fan rotational speed responding to real-time shifts of engine coolant and internal hydraulic oil temperatures. It delivers stable heat dissipation across diversified construction scenarios, including tight urban trench excavation, residential landscape refurbishment, compact foundation digging, indoor renovation projects and rural farmland earthmoving. Adaptive speed regulation effectively prevents engine thermal overload throughout frequent start-stop operation cycles, and reduces unnecessary fan rotation during idle intervals to cut overall fuel consumption on construction sites.

Product Highlights

✅ Dual Short-Tail Model Adaptive Proportional Speed Tuning

Compact built-in DC12V proportional solenoid delivers smooth stepless speed tuning matching the heat output characteristics of PC75UU-3 and PC78US-5 narrow-swing excavators. Fan speed automatically rises during sustained digging for adequate heat dissipation, and drops during frequent work pauses to minimize idle power waste and regular fuel expenses.

✅ Space-Saving OEM Mount Layout Designed for Cramped Engine Bays

Downsized reinforced mounting flanges, finely threaded hydraulic ports and precision splined shafts perfectly adapt to the narrow internal engine space of both short-tail excavator variants. No destructive frame cutting or pipeline remodeling is needed during replacement, greatly shortening downtime for downtown and narrow-site construction jobs.

✅ Shock-Resistant Mini Cast Iron Casing

Thickened compact cast iron housing absorbs repeated micro-vibration from digging strokes and bumpy transit on narrow job paths, preventing casing cracks and loosening of delicate internal hydraulic components during intensive daily operation cycles.

✅ High-Performance Sealing Fit for Urban and Rural Worksites

Stacked premium fluorine rubber oil seals alongside compact outer dust gaskets block concrete dust, landscaping soil particles and wet trench muck, slowing seal degradation for inner-city landscaping, narrow municipal trenches as well as muddy rural construction plots.

✅ Multi-Step Strict Factory Quality Control

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. Potential manufacturing flaws get eliminated pre-delivery to lower recurring on-site maintenance frequency.

✅ Dual Procurement Solutions for Varied Budget Plans

Factory-new units satisfy official maintenance standards of authorized Komatsu service centers; remanufactured versions thoroughly replace worn internal hydraulic core components, bringing prominent cost advantages for wholesalers stocking spare parts for short-tail excavator series.

✅ Simplify Warehouse SKU Planning

One spare can cover two sought-after narrow-swing excavator models, simplifying stock classification significantly and decreasing capital occupied by scattered small spare inventories.

✅ Precision Dynamic Balancing for Internal Rotors

Mini rotating inner assemblies receive professional dynamic balancing treatment to cut vibration and operating noise, reliably safeguarding fragile compact radiator fins housed in highly constrained engine compartments.

✅ Prolong Service Lifespan of Compact Hydraulic Loops

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

✅ Optimized Cross-Border Shipping Performance

Compact outer dimensions reduce international freight expenditure, shock-absorbing industrial packaging remains intact in sea, air and ordinary parcel delivery. Tiered bulk purchase discounts are available, backed by standard 6-month global warranty excluding man-made damage and faulty installation.

Condition: Brand new

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