一农户新购置东方红—802链轨拖拉机,使用不到半年时间,发现起动机起动困难。检查各部只发现火花塞有些积炭,火花微弱。更换新火花故障未除,更换磁电机线圈也无效。后来换上新的磁电机才起动正常,但起动机工作状态不佳,功率不足。什么原因造成的呢?经过仔细观察,发现问题竟出现在小小的断电熄火按钮上。由 A new purchase of Dongfanghong -802 chain track tractor, the use of less than six months and found the starter difficult to start. Check the ministries found only some spark plug coke, sparks weak. Replace the new spark failure is not removed, replace the magneto coil is invalid. Later replaced by a new magneto before starting normal, but the starter work in poor condition, lack of power. What causes it? After careful observation, we found that the problem actually appeared in the small power off button. by