When the excavator is working, there are tens of positions on the big and small arms and the bucket that will move relative to each other. The pin shaft and the shaft sleeve of these positions have friction all the time when they are working, and because of the large working load of the excavator, the forces on these parts are also very large.
Four pin shafts on excavator bucket need lubrication
This can be real steel and solid iron. If it is allowed to "dry grind" under such a large working intensity, the shaft pin and shaft sleeve will be severely worn. In a few days, the clearance will be very large, affecting the work of the excavator and the maintenance and replacement cost is high. In order to reduce this part of friction, the excavator has designed lubricant injection and retention channels in these moving parts, so that every two moving parts can form an oil film in the middle of work, reducing wear. And this lubricant is butter, a scientific name for grease.
How often do I need to beat butter?
In order to make the excavator work better, the operation manual of each excavator has marked the maintenance time of each part, and the butter is generally filled every 5-8 hours during the working time, that is to say, the butter needs to be filled at least once every day.
Centralized lubrication point on Liugong 936E excavator
When the excavator is equipped with an apprentice, the work is usually done by the apprentice. There are dozens of lubrication points on the large and small arms of the excavator and the bucket. Each lubrication point needs to be "pressed" by the grease gun eight or nine times during lubrication. It's really an individual activity to play so many positions once a day.
Can gear oil or oil be used instead?
One might ask, why not use gear oil? It's better to pour it directly. It's not as tired as butter.
Grease fitting from the pin shaft of the excavator stick cylinder
In fact, this is due to the characteristics of the excavator when it works. These working parts of the excavator are all "low speed and heavy load", and the sealing is not good. If liquid lubricating oil is used, it is easy to leak out and can not form a good oil film. Therefore, the front end working device of the excavator needs to be filled with lubricating grease, which has a long retention time and can form an oil film on each lubricating part to maintain good lubrication.
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