When the spring force of the spring for fuel injector cuts down, fuel atomization and combustion are bad, so that engine power drops and oil consumption increases. When the spring force of the governor spring cuts down, the engine reduces its speed and power, resulting in “traveling block”: when the spring forces of the pressure adjusting spring of the lubrication system and the safety valve spring of the hydraulic system cut down, the parts become accelerated wear and the technical state of the engine is bad; when the spring force of guide spring of gear shift fork cuts down, the gears of gear box can’t be positioned stably, resulting in automatic jump and disorder. So, you shall adjust the pressure of the above adjustable springs timely.