fan blade JCM921

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The fan blades of excavator engines are key components of the cooling system for heavy equipment, and their function and maintenance directly affect the stability and lifespan of the equipment.
1、 Core functions
High intensity heat dissipation
To cope with the continuous high load operation of excavators, strong airflow is generated through larger diameter blades (usually 60-80cm), and the heat dissipation efficiency is more than 30% higher than that of ordinary vehicles.
Collaborate with hydraulic oil coolers, intercoolers, and other components to achieve multi system coordinated heat dissipation.
Anti pollution design
The fan blades for construction machinery are made of reinforced nylon composite materials or aluminum alloys, which have anti rust and anti stone impact properties.
The blade angle is usually 25-35 °, optimizing airflow guidance in dusty environments.
2、 Professional maintenance methods
Daily inspection (before and after daily homework)
Shake test: Shake the fan by hand, and the radial clearance should be less than 2mm and the axial clearance should be less than 1mm.
Crack detection: Focus on inspecting the connection between the blade root and the hub, and use a strong flashlight to observe micro cracks.
Deep cleaning (every 250 working hours)
High pressure air gun dust removal: blow in reverse from the radiator, control the pressure at 3-5 Bar to avoid damaging the fins.
Oil pollution treatment: Soak stubborn oil sludge in diesel and clean it with a hard bristled brush (wire brush is prohibited).
Lubrication maintenance (every 500 hours)
Bearing lubrication: Use NLGI grade 2 lithium grease and add it through the oil nozzle until the old grease is completely drained.
Belt pulley maintenance: Check the tensioner offset (standard value 10-15mm), replace if it is excessively worn