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This clip will take everyone to see how to analyze the problem of the Maktec MT871 rotary drill rarely drilling. The symptom is that when drilling into concrete, it sometimes hits and sometimes doesn't. The content will be an in-depth analysis. In mechanical systems and theoretical principles of equipment operation that commands the drilling aspect, which if you can understand It will solve problems that may occur again later. And it will extend the life of the tool longer as well. Channel link / jkmaintenance Related links • Disassembly and assembly of rotary drill ejector shaft ... Contact for online repair Id line, telephone.. 0960087017