As long as the machines and friends of the excavator circle all know, in the circle, whether the repair bag must use the original factory or not, it can be said that it is inflexible. In particular, in the face of the "temptation" on the price of the original subsidiary factory, many people have stood on the side of the auxiliary factory.
So can the repair bag really be used without the original parts? Here's a real fault for using the non original parts.
Failure phenomenon
Master Wang in Wenchuan, Sichuan, used the Komatsu 300-7 excavator, and occasionally found that the excavator had a powerless bucket movement during the work, but all the other working devices were normal, no weakness was found, the engine was normal, and the instrument did not show the alarm.
The inability to check the action of the bucket rod of the 300-7 excavator of the KOMATSU
In view of the above phenomenon, many people may be confused in the moment, and how to solve this problem in the end? Because other working devices have no abnormality, where is the fault point? Do not worry, the brick family will help you to analyze it.
First, the pressure of the action spillage of the bucket rod is 5MPA, the leading pressure is low in the main oil pressure of the 3.2MPA. bucket, the normal PC300-7 overflow pressure is 37.3MPA, the pilot pressure is normal, and the pressure of the other working equipment is normal.
After checking the safety oil suction valve of the bucket, the abnormal phenomenon is not found, and the abnormal phenomenon of wear is not found. When the main stem of the bucket rod is dismantled, the main stem is found to have a leak phenomenon, but the fault still exists after the treatment.
Finally, in the communication with the friends of the machine, it was found that the bucket rod oil cylinder repair bag was used as a non original piece. At this time, after the disassembly of the small arm cylinder, it was found that the piston of the cylinder had scratches, and found a lot of iron chips, and the support ring of the piston rod had been completely damaged, and the cylinder cylinder was badly damaged.
Processing results
Because the cylinder piston seal of the bucket rod is invalid, the cylinder has the rod cavity connecting with the rod free chamber, which leads to the inability of the bucket rod oil cylinder. At this time, the hydraulic system must be cleaned and the cylinder assembly of the bucket rod is replaced.
Summary of brick home
In fact, this is a very typical failure, the customer because of the replacement of non original oil cylinder sealing components, not only caused the material loss, but also caused time loss.
In the final analysis, the price of a original factory's repair bag is about hundreds of yuan, the auxiliary factory repair bag has some advantages relative to the price, but once a problem needs to be replaced, a few thousand and more tens of thousands of dollars have been drifted in vain. So the old driver suggested that everyone should use the original factory or other parts, and we must use the original factory. Piece! Don't be too big!
