Figure 1 shows the connection structure of the main cylinder block and end cover of the B690 hydraulic drive bullhead planer. The extension screw 3 is a non-standard part, which is not only expensive to manufacture but also troublesome to maintain. To this end, we have improved the structure of the end cap 4 by changing the shallow counterbore on the original end cap to a deep counterbore (Fig. 2) so that the extension screw is changed to a standard screw. It can be seen from Fig. 1 that the cylinder block 1 and the end cap 4 are connected by two symmetrical semicircular snap rings 6 and flanges 2. Semicircular snap ring width and
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