Hydraulic Pump 708-3S-00850 Fan Motor Komatsu

Product Overview

708-3S-00850 hydraulic fan motor is OEM-grade heavy-duty cooling replacement part precisely engineered for Komatsu PC56-7 and PC55MR-2 compact mini excavators.

Acting as the indispensable core power unit of radiator cooling loops for these two widely favored compact excavator models, this electro-proportional hydraulic fan motor intelligently adjusts fan rotational speed in response to real-time shifts of engine coolant temperature and internal hydraulic oil temperature. It delivers stable and reliable heat dissipation across diversified construction scenarios, including municipal narrow trench digging, residential landscape upgrading, light foundation excavation, confined indoor refurbishment and dispersed farmland earthworks. Adaptive speed regulation effectively prevents engine thermal overload during frequent cyclic start-stop operations that are typical of compact construction machinery, and optimizes fuel economy by cutting unnecessary fan rotation during intermittent idle periods on small construction job sites.

Product Highlights

✅ Dual-Model Calibrated Proportional Speed Control

Dedicated compact DC12V proportional solenoid achieves smooth stepless speed adjustment tailored to the operational characteristics of PC56-7 and PC55MR-2. Fan speed automatically rises throughout sustained digging assignments to deliver adequate cooling capacity, and lowers during frequent work pauses to reduce idle power wastage and long-run fuel costs.

✅ Precision OEM Mounting Structure for Narrow Engine Compartments

Downsized reinforced mounting flanges, finely machined hydraulic port threads and matched shaft splines perfectly fit the tight installation space of the two excavator variants. No on-site metal cutting or hydraulic pipeline rework is required during replacement work, significantly cutting down equipment downtime in dense urban streets and residential construction plots.

✅ Anti-Vibration Reinforced Cast Iron Shell

Thickened compact cast iron casing effectively dampens continuous micro-shocks produced by frequent short-stroke digging movements, preventing shell deformation and loosening of delicate internal hydraulic components throughout intensive daily operation cycles.

✅ Multi-Scenario Dustproof and Mudproof Sealing Performance

Layered premium fluorine rubber sealing rings paired with mini outer dust gaskets isolate concrete powder, horticultural soil and damp trench sludge from internal mechanical structures, slowing seal abrasion in landscaping projects, municipal trench assignments and muddy suburban construction locations.

✅ Multi-Stage Pre-Shipping Quality Screening Procedure

All finished units pass a 30-minute 22MPa pressure retention leak inspection, precision linear speed calibration and 2.5-hour continuous full-load aging test. Hidden manufacturing flaws get eliminated in advance to decrease recurring follow-up maintenance tasks at construction sites.

✅ Two Practical Budget-Friendly Procurement Options

Factory-standard brand-new products meet strict maintenance requirements from official Komatsu dealerships; remanufactured units fully refresh worn internal hydraulic core components, bringing prominent cost advantages for wholesalers maintaining bulk mini excavator spare inventories.

✅ Improved Stock Management Efficiency

One spare part is compatible with two mainstream compact Komatsu excavator models, lowering required SKU quantities, simplifying warehouse sorting workflows and releasing capital locked inside scattered spare stock.

✅ Dynamically Balanced Mini Internal Rotor Assembly

Scaled-down rotating internal components go through professional dynamic balancing treatment to suppress vibration and operational noise, providing reliable protection for fragile compact radiator fins within cramped engine bays.

✅ Extended Service Life of Whole Compact Hydraulic Circuits

Stable thermal regulation keeps small-displacement engines and supporting hydraulic fittings within optimal working temperature bands, slowing ageing of tiny pump internals, slim rubber hoses and peripheral seals under frequent startup-shutdown cycles.

✅ Reliable Global Logistics Adaptability

Compact overall dimensions cut international shipping expenses, shock-resistant industrial packaging maintains stable performance during sea freight, air transportation and ordinary parcel delivery. Tiered bulk purchase discounts are available, backed by unified 6-month global warranty excluding human-caused damage and incorrect mounting.

Condition: Brand new

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