Direct Fit 11 Blade Cooling Fan OE Z530-38-65-8T11 8 Holes for 4D31 Diesel Kato HD450-7 Excavator OEM Bolt-On Replacement Describe: This direct-fit 11-blade engine cooling fan (OE Z530-38-65-8T11) is a precision OEM replacement for Kato HD450-7 excavators with the Mitsubishi 4D31 diesel engine. Designed for straightforward bolt-on installation without any modification, drilling, or adapters, it mounts directly to the factory water pump pulley using the 8-hole mounting pattern