Hitachi Sumitomo Crane SCX550 Idler

Original codes

4460258

Compatible with the following equipment:

CX650-2 MH5510B SCX500 SCX500-C SCX550 SCX550-C SCX700 SCX700-C3 SCX700HD

Crawler crane idler damage causes

1. It is because the bimetal sleeve sliding bearing of the guide wheel is out of tolerance, and the crawler walks produce vibration and impact. Once the geometric size is out of tolerance, the gap between the guide wheel shaft and the shaft sleeve is too small or no gap, and the thickness of the lubricating oil film is not enough or even No lubricating film.

2. The surface roughness of the guide wheel shaft is out of tolerance. There are many metal ridges on the shaft surface, which destroy the integrity and continuity of the lubricating oil film between the shaft and the plain bearing. During operation, a large amount of metal wear debris will be produced in the lubricating oil, which will increase the surface roughness of the shaft and the bearing, and worsen the lubrication state, resulting in serious wear of the guide wheel shaft and the sliding bearing.

3. The original structure is defective. The lubricating oil is injected from the plug hole at the shaft end of the guide wheel, and then gradually fills the entire cavity. In actual operation, if there is no special tool for oil injection, it is difficult for the lubricating oil to pass through the circuitous cavity in the guide wheel only under the action of its own gravity, and The gas in the cavity is not discharged smoothly, and it is difficult to fill the lubricating oil. The oil filling space of the original machine cavity is too small, resulting in a serious shortage of lubricating oil.

4. The lubricating oil in the gap between the guide wheel shaft and the shaft sleeve cannot take away the heat generated by the bearing operation because there is no oil passage, resulting in an increase in the working temperature of the bearing, a decrease in the viscosity of the lubricating oil, and a reduction in the thickness of the lubricating oil film.

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