708-1T-00551, 708-1T-04150, 708-1T-00552 Komatsu D39-22 Bulldozer Fan Pump Auxiliary Pump Key Features Precision-machined gears for high volumetric efficiency and stable output Durable, wear-resistant housing for long service life under heavy load Direct OEM-fit mounting; bolt-on replacement, no modification required Rigorously tested against OEM specifications for pressure and flow performance Common Faults & Diagnosis Low cooling performance / abnormal fan speed: pump wear