ＹＫ—４系列高速涡轮牙钻机是荣获国家质量银奖的紧俏商品。该系列分Ａ、Ｂ两种型号，其车头冷却水雾的供给原理相同，故当车头无冷却水雾（或不足）时它们的故障原因和检修方法也相同。车头无冷却水雾（或不足）是该系列机器最常见的故障，本文仅介绍笔者的检修体会。一、使 The YK-4 series of high-speed turbo dental drills are short products that have won the National Quality Silver Award. This series is divided into A, B two models, its front cooling water mist supply principle is the same, so when the front no cooling water mist (or lack of) when their failure causes and repair methods are the same. The lack of cooling water mist (or lack thereof) is the most common fault of this series of machines. This article only introduces the author’s experience of maintenance. First, make