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Suzhou Zhaoneng Precision Spring Hardware Co., Ltd.

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Spring maintenance and maintenance knowledge

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Spring maintenance and maintenance knowledge

Release date2014-08-07 Author Click

Valve spring

Valve spring by high temperature and cyclical high-frequency alternating force, the use of a period of time will produce wear and plastic deformation, so that elastic weakened, resulting in valve closed lax engine power down, exhaust black smoke, start difficulties malfunction. therefore. Check valve spring force periodically. Can be in the old spring and the new spring pad between a small piece of metal, clamped on the bench vise on the pressure comparison, to see the extent of its shortening. When the new spring compression to the original 2/3 length, if the old spring 2mm shorter than the new spring, it should be replaced. If no spare parts, in the old spring pads on the 2mm flat washers to compensate for its lack of elasticity. Under normal circumstances, the valve spring to use after 2500 ~ 3000h should be replaced.

2. Fuel pump plunger spring

Injection pump plunger spring will also be subject to periodic high-frequency alternating force of the role of wear and tear, deformation, so that the free length of shortening, elastic weakened. Elastic weakened, the plunger to slow down the return position. such. When the engine is running at high speed, the reciprocating motion of the plunger can not keep pace with the high speed rotary motion of the oil pump cam, so that the plunger lift is reduced. A corresponding reduction in fuel supply, resulting in engine power decline. Therefore, when the plunger spring 3600 ~ 4500h should be replaced after use.

3. Oil valve spring

After the spring out of the oil valve weakened. Will cause high-pressure oil leakage within the serious, high-pressure tubing to reduce the residual pressure, the oil valve seat is not rapid, resulting in reduced fuel supply and instability, the engine work and "car." In addition, the injector will start spraying weak, off the oil does not simply appear after the drop phenomenon. Resulting in deterioration of combustion, engine overheating, exhaust black smoke. Therefore, the valve spring is generally used in 3600-4500h should be replaced, if any bending deformation, should be replaced.

4. Speed control spring

Small diesel engine speed control spring should pay attention to the following points.

(1) stop after the diesel engine speed control handle should be placed in the stop position, so as to avoid the governor spring in a long-term tension state, resulting in weak elasticity.

(2) speed springs and other parts should always be cleaned to avoid dust, debris blocking, resulting in stuck, affecting the governor to work.

(3) are not allowed to use the speed control spring "tie dead" approach to improve engine speed, or it may cause serious consequences.

(4) because of the spring after the spring when the spring becomes smaller, the diesel engine will not reach the speed, then adjust the screw can be used to adjust. When adjusting the adjustment screw, the engine speed must be measured with the tachometer.

5. Clutch spring

Most of the time the clutch spring is subject to the role of static pressure, the use of time is too long, plastic deformation occurs, the free length of shortening, elastic weakened. The spring force of the clutch spring is weakened. The clutch can transmit torque will be reduced, the engine's power can not be fully play, resulting in locomotive work weak. When the spring force of the clutch spring is found to be weakened, it can be adjusted by adding the appropriate thickness of the gasket in the part pits in contact with the spring. When adding gasket should be noted that the same clutch assembly on the free length of the spring (including gasket thickness) should be consistent. If the spring after the spring can not restore the original elastic, should replace a new set of springs. Under normal circumstances, when the spring to use 2500 ~ 3000h, should be added 1 ~ 2mm thick gasket to adjust the pressure; use 5000h, all the springs should be replaced at the same time.

6. Walking tractor steering spring

When installing the steering spring, first identify the left-hand or right-hand spring. The left should be installed right-hand spring, the right should be installed left-hand spring. If the left and right spring installed wrong, the tractor steering, the steering spring will be subject to a reverse winding of the torque, so that the spring deformation, or even break the spring, or steering gear to scrape damage within the step. Once the spring is broken and the steering handle is relaxed, the steering gear loses its thrust. Jaws can not be back, it is likely to lead to serious accidents. Left and right spring identification methods: with his left hand holding the spring, the thumb up, and the remaining 4 refers to the direction just the same with the wire rotation for the left-hand spring: the contrary for the right-hand spring.

In addition, insufficient spring force in the steering spring may cause the tractor to lose its handling stability. The steering spring should therefore be checked regularly. Check and adjust the method and valve spring the same, but should be on both sides of the same thickness flat gasket. Generally about 4 years to adjust once.

7. Adjustable elastic spring

When the injector pressure spring elastic weakened. Fuel atomization bad, the deterioration of combustion, engine power down, fuel consumption increased; governor speed spring elasticity weakened, the engine speed reduced. The engine technology state of deterioration; shift fork positioning spring elasticity weakened, the transmission speed of the spring pressure of the hydraulic system is reduced, Box gear can not be reliably positioned, will automatically jump block and chaos phenomenon. Therefore, the adjustable spring should be promptly adjust its pressure.


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