Hydraulic Pump 708-1W-00620 Fan Motor Komatsu

Product Overview

708-1W-00620 hydraulic fan motor is OEM heavy-duty cooling replacement part custom-made for Komatsu motor graders including GD655-3C, GH320-3, GD555-3, GD675-3 and GD755-3.

Serving as the vital power unit of radiator cooling loops for these five grader variants, this electro-proportional hydraulic fan motor dynamically adjusts fan rotation speed following real-time shifts of engine coolant and hydraulic oil temperatures. It delivers steady and reliable heat dissipation during highway road grading, airport runway leveling, rural road maintenance, mine access road construction and large land grading projects. The adaptive speed mechanism effectively prevents engine thermal overload during all-day roadwork shifts and cuts unnecessary fuel consumption.

Product Highlights

✅ Proportional Speed Tuning Optimized for Motor Graders

Built-in heavy-duty DC12V proportional solenoid delivers seamless stepless speed adjustment. Fan output rises during heat-intensive scarification and long flat grading tasks, and lowers during transit/idle intervals, reducing wasted engine power and enhancing overall fuel economy for long road construction shifts.

✅ Perfect OEM Mount Dimensions for Five Grader Models

Strengthened mounting flanges, reinforced port threading and precision-machined shaft splines precisely fit the factory installation cavities of GD655-3C, GH320-3, GD555-3, GD675-3 and GD755-3. No on-site metal cutting or pipe remodeling is required, shortening downtime significantly on remote highway job sites.

✅ Anti-Vibration Reinforced Cast Iron Casing

Monolithic extra-thick alloy cast iron shell absorbs frequent jolts from rough unpaved construction roads and heavy grader blade operations. It avoids housing cracks and internal hydraulic part loosening even under bumpy, long-term road grading workloads.

✅ Multi-Purpose Sealing for Varied Road Conditions

Stacked fluorine rubber seals plus oversized outer dust gaskets hold back pavement dust, sharp gravel, muddy road sludge and winter deicing slush. Seal degradation slows down greatly in dry dusty highway zones, rainy muddy job sites and cold northern winter maintenance scenarios.

✅ Multi-Step Factory Quality Verification

Each finished unit undergoes 22MPa pressure holding leak inspection, fine speed calibration and extended full-load aging testing. Potential manufacturing defects get eliminated before delivery to lower recurring roadside repair costs.

✅ Dual Purchasing Options to Fit Budget Levels

Brand-new factory-spec motors meet stringent maintenance standards for state-level road construction teams; remanufactured versions fully replace all worn internal hydraulic components to deliver notable cost advantages for bulk warehouse stocking.

✅ Five-Model Cross Compatibility

Only one SKU covers five mainstream Komatsu grader models, which reduces inventory categories, simplifies warehouse sorting and cuts capital locked into spare part stock.

✅ Dynamically Balanced Rotor for Smoother Operation

Large internal rotating assemblies go through professional dynamic balancing processing to dampen vibration and running noise, protecting fragile radiator fins and surrounding hydraulic tubing during frequent grader movement over bumpy terrain.

✅ Prolong Service Life of Grader Hydraulic Systems

Consistent temperature control keeps engines and main hydraulic assemblies within optimal working temperature bands, slowing aging of internal pump structures, rubber hoses and peripheral seals under continuous road construction workloads.

✅ Adaptable International Shipping Solutions

Sturdy shock-absorbent industrial packaging suits sea shipment, air freight and cross-border express delivery. Tiered wholesale discounts apply for bulk orders, backed by standardized 6-month worldwide warranty terms.

Condition: Brand new

Other model specifications

Technical Specifications:

Specifications: