Chomwe chimasiyanitsa mkono wa miyala wa Kaiyuan womwe unayikidwa pa XCMG 490 excavator ndi mpikisano wake ndi kapangidwe kake kapamwamba komanso uinjiniya.
Kaiyuan Rock Arm, monga mkono wosinthidwa wa ntchito zambiri, ndi yoyenera kukumba popanda kuphulika, monga migodi ya malasha yotseguka, migodi ya aluminiyamu, migodi ya phosphate, migodi ya golide yamchenga, migodi ya quartz, ndi zina zotero. Ndi yoyeneranso kukumba miyala yomwe imapezeka pomanga misewu ndi pansi pa nthaka, monga dongo lolimba, miyala yosweka, shale, miyala, miyala yamchere yofewa, miyala yamchenga, ndi zina zotero. Ili ndi zotsatira zabwino, mphamvu zambiri za zida, kulephera kochepa, kugwiritsa ntchito mphamvu zambiri poyerekeza ndi nyundo zosweka, komanso phokoso lochepa. Rock Arm ndiye chisankho choyamba cha zida zopanda kuphulika.

