4443782 Excavator tank Cover for Hitachi ZX160

Part number 4443782 is an original integrated oil tank breathing valve cover specially designed by Hitachi for the ZX160 series medium-sized hydraulic excavator. Its universal models mainly cover platform models such as ZX160-5A and ZX170-5A, and are also applicable to models such as ZX160-3 and ZX180 with similar tonnage and fuel tank design. This component is not an ordinary sealing cover, but a key functional part that integrates a pressure/vacuum breathing valve to balance the air pressure inside and outside the fuel tank. As an original component, its installation thread specifications, breathing valve pressure setting value, and fuel tank port are perfectly matched

This product is a metal fuel tank cap with an integrated breathing valve. The main body is precision stamped silver gray cold-rolled steel, with a raised structure with reinforcing ribs in the center. The interior is integrated with precision springs and valve plates, forming a two-way pressure regulating valve. Multiple mounting holes are evenly distributed on the edge of the wide flange around the periphery, which are used to fasten the oil tank port with bolts to achieve reliable sealing. The tubular interface on one side of the central protrusion is a key feature used to connect fuel vapor vent hoses and direct overpressure fuel vapor or air into specific pipelines. Its core function is to automatically maintain a safe micro pressure environment on a sealed fuel tank: exhaust when the internal pressure is too high, and supplement air when a vacuum is formed inside, ensuring smooth fuel supply and meeting environmental requirements.

Installation specifications: 1 Cleaning inspection: Before installation, it is necessary to clean the threads and sealing surfaces of the fuel tank port, and check whether the breathing valve interface and sealing gasket of the new fuel tank cap (4443782) are intact. 2. Connecting the pipeline: First, firmly connect the ventilation hose to the central interface. 3. Alignment tightening: Align the fuel tank cap with the fuel tank opening, pre tighten by hand, and then use a torque wrench to evenly tighten the surrounding mounting bolts in diagonal order to the specified torque (usually 10-15 N · m), ensuring that the gasket is evenly compressed to prevent leakage.