High temperatures, shock, friction, age and vibration contribute to the depreciation and breakdown of components in heavy machines. Belts and gears may be misaligned which may lead to vibration and wear. Shock, sudden loads, friction, extended use, worn parts and poor lubrication are a few reasons which can give rise to high temperatures. A lot of important components are affected by age. over time, seals will dry and crack, belts will warp and bolts will stretch out of shape and loosen.