Ten taboos in construction machinery maintenance–6

In today’s second article, we will continue to look at the sixth of the ten taboos in construction machinery maintenance.

Polish the bearing bush with emery cloth

For some inexperienced repairmen, scraping is a difficult job. Since the scraping technique is difficult to master, it is difficult for the bearings to meet the technical requirements. For this reason, when some people replace the bearing bush, in order to increase the contact area between the bearing bush and the crankshaft, they use emery cloth to polish it instead of scraping the bush. This method is extremely undesirable in actual maintenance, because the abrasive grains on the emery cloth are relatively hard, while the bearing alloy is soft. In this way, the sand grains are easily embedded in the alloy during grinding, and the wear of the journal will be accelerated when the diesel engine is working. Shorten the service life of the crankshaft.

PC220-8 Komatsu excavator main bearing set 6754-22-8100

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