<p>(1) engine power reduction:Plateau cold region, high altitude, low pressure. The boiling point of the cooling water decreases to about 90 ℃ at the elevation of 2000 m, and the boiling point of the cooling water drops faster when the altitude exceeds 4000m. Often cause the engine "boil", fuel pipeline "air resistance", resulting in inadequate engine oil supply, power down.
The oxygen content of the air is about 90% in the plain area, and the oxygen content is decreased by 10% for every 1000 m above the sea level. The oxygen content is reduced, which leads to the mixture of Gas is too thick, the combustion is not sufficient, the engine black smoke, power decline.</p>
<p>(2) Clutch slipping:In the cold area of ​​the plateau, the road is steep and steep. The construction machinery must change the driving force and traveling speed through frequent shifting to meet the requirements of various complicated road conditions. This will inevitably lead to the separation of the clutch, the increase of the joint frequency and the increase of the wear.
Due to the special geographical environment of the plateau cold region, slope and more steep and long, resulting in engineering machinery traction resistance increases, increasing the clutch work load, and even cause damage to the clutch overload. Plateau cold areas of the driver's skill requirements, some drivers on the plateau cold areas shift, clutch and other operational skills to master poor, making human failure increased.</p>
<p>(3) reduce the braking efficiency:Plateau cold area bend more steep slope, which makes the use of frequent braking devices, brake strength increases, brake shoes wear increased. Especially under the long slope, if the speed is too fast or the distance is too small, the number of frequent braking after the car will increase.</p>

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