7 . no parts and components or complete power unit warranty will be delivered if gear shaft seize , cylinder scraping or moving friction pad are seriously worn out , resulting in damaging relevant parts or complete power unit , due to lack of oil insufficient engine oil or failure of engine oil or improper use of engine oil following engine instruction 因缺油机油量不足机油失效或未按发动机使用说明书规定牌号使用机油，导致咬轴抱轴拉缸或各运动摩擦付严重磨损，而损坏相关零部件或导致整机毁坏的，相关零部件或整机不给予保修。
There will appear a very uneven flow field , and appear a very big velocity magnitude distribution and ash concentration distribution near back wall . thus , the velocity magnitude is far bigger than that of optimal design velocity magnitude , which will lead to serious wear and tear in metal face of heater . especially , because of curve structure in front of heat pipe air preheater , there is more serious wear and tear 由于靠近竖井后墙面的烟气流速很大，飞灰浓度也较大，断面速度分布的最大速度大于最佳设计速度的2 - 3倍，这样将造成受热面的严重磨损，特别是热管空气预热器前端烟道的几何结构有一定的转角，更增加了磨损的程度。
