Taboo of engineering machinery maintenance — new cylinder liners and pistons are installed without selection

When replacing the cylinder liner and piston, some maintenance novices think that the new cylinder liner and piston are standard parts, which are interchangeable and can be used after installation. In fact, there is a certain tolerance range for the size of cylinder liner and piston.

If the cylinder sleeve with the largest size is matched with the piston with the smallest size, the fit clearance will be too large, resulting in weak compression and difficult starting. Therefore, it is necessary to check the size grouping code of the standard cylinder liner and the piston during replacement. The size grouping code of the standard piston must be the same as that of the standard cylinder liner for the cylinder liner and the piston used for replacement. Only in this way can the standard fit clearance be ensured between the two.

In addition, when the cylinder liner and piston with the same group code are installed in each cylinder, the clearance of the cylinder piston should be inspected before installation. In order to ensure the assembly standard, a test should be carried out before installation to prevent the installation of fake and inferior products.

There are many taboos in construction machinery maintenance. This is the third article in this series. We will continue to update it. If you are interested in it, you can pay attention to us. In addition, if you need to buy used excavators, used loaders, used graders and other used machinery or related accessories, you can contact us at any time.