Reasons for damage of bulldozer accessory idler, Kazakhstan bulldozer roller

Reasons for damage of bulldozer accessory idler, Kazakhstan bulldozer roller

Bulldozer excavates soil, coal, sand, pre loosened soil, rock and other materials through bucket, and then loads the materials into transport vehicles or discharges them to the stockyard. Nowadays, bulldozer is one of the main construction machinery in engineering construction. The bulldozer idler is installed on the track to guide the track to rotate correctly. The bulldozer idler assembly can prevent it from deviating and derailing. Improper use will also cause damage to the idler. Brother Digg asks you how many reasons cause damage to the idler? Let’s discuss it with Brother Dig.Kazakhstan bulldozer roller

Working principle of bulldozer guide wheel:
Use a grease gun to inject butter into the grease cylinder through the grease nozzle, so that the piston extends out to push the tensioning spring, and the guide wheel moves to the left to tighten the track. The tensioning spring has a proper stroke, and when the tensioning force is too large, the spring is compressed to play a buffering role; After the excessive tightening force disappears, the compressed spring pushes the guide wheel to the original position, so that it can slide along the crawler frame to change the track pitch, ensure the disassembly and assembly of the crawler, reduce the impact in the walking process, and avoid the derailment of the rail chain.Kazakhstan bulldozer roller

Causes of damage to bulldozer idler:
1. The bimetallic sleeve sliding bearing of the idler is out of tolerance in different shaft degrees, which will cause vibration and impact when the crawler travels. Once the geometric dimensions are out of tolerance, the clearance between the idler shaft and the shaft sleeve will be too small or no clearance, and the thickness of the lubricating oil film will be insufficient or even no lubricating oil film.
2. The surface roughness of idler shaft is out of tolerance. There are many metal peaks on the shaft surface, which destroys the integrity and continuity of the lubricating oil film between the shaft and the sliding 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 bearing, worsen the lubrication state, and cause serious wear of the idler shaft and sliding bearing.Kazakhstan bulldozer roller
3. The original structure has defects. The lubricating oil is injected from the screw plug hole at the shaft end of the idler, 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 idler only under its own gravity, and the gas in the cavity is not discharged smoothly, so it is difficult to fill the lubricating oil. The oil filling space of the original chamber is too small, resulting in a serious shortage of lubricating oil.

4. The lubricating oil in the clearance between the idler shaft and the shaft sleeve cannot take away the heat generated by the bearing operation because there is no oil passage, which causes the working temperature of the bearing to increase, the viscosity of the lubricating oil to decrease, and the thickness of the lubricating oil film to decrease.