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Engine common faults

Experience summary of the reasons for diesel engine idling stall

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Experience summary of the reasons for diesel engine idling stall



Komatsu excavation machine maintenance sharing, experience summary of the reasons for diesel engine idling stall
1.Deep well pump plunger wear and tear (a basic type of component failure). The effective stroke of the plunger refers to the stroke from the time the plunger closes the fuel inlet to the end of the fuel supply. The existence of the spiral groove of the plunger, the effective stroke of the plunger is small at idle, so the fuel supply is small. The normal idle position (position) should be able to maintain the diesel engine running at the lowest rated speed without stopping. Vice wear, tightness will inevitably decrease (descend) .During the compression stroke, the diesel oil easily leaks down from the worn part. The diesel engine is turned off. Due to the leakage of diesel, the start of the fuel supply is delayed, the fuel supply end time is advanced, the fuel supply period is shortened significantly, the fuel supply of each cylinder is reduced, and the power of the diesel engine In addition, due to the different wear levels of the plunger pairs of each cylinder, and the diesel leakage is not balanced (Balance), it often makes the fuel supply of each cylinder of the diesel engine unequal, which makes it unstable and easy to operate. Cause idling stall. Excavator repairs are available all year round with various types of imported engineering machinery commonly used engine parts and hydraulic parts, as well as new and old assemblies such as hydraulic pumps, multi-way valves, hydraulic motors, engines, etc. at reasonable prices and authentic quality. Our company provides futures supply, convenient and fast, quality assurance, providing our customers with professional 24-hour warranty service, a phone call, one step in place, to provide you with fast and excellent service. The maintenance excavator company always insists on providing first-class service to users with first-class quality, first-class technology, and first-class reputation. It has focused on difficult excavator technology for many years in China, and has rich experience in excavator maintenance and sales. A series of high-precision excavator maintenance and testing equipment, such as a comprehensive test bench and computer board debugging bench, provide users with first-class services. We will provide the best quality service to new and old customers of imported construction machinery!
2. Unbalanced idle fuel volume adjustment (Balance). The diesel engine uses PE8P120 type deep well pump. The plunger structure is a lower spiral groove plunger, and the spiral groove is turned to the right. When adjusting the oil amount of the spiral groove plunger, the fuel supply amount of the plunger changes proportionally with the rotation angle of the plunger. Therefore, when the idle fuel supply lever changes, the probability of fuel injection amount change is also greater. For this reason, it is required that the idle fuel quantity adjustment must be accurate. If the fuel supply adjustment of each cylinder is not balanced and is not within the specified range, the idle speed of the diesel engine is also very easy to stall. The maintenance excavator has the strength to undertake "difficulty problems" that cannot be repaired elsewhere. It has the leading domestic excavator testing, debugging and maintenance equipment and can accurately detect the actual problems of your machine. Common failures of excavators such as excavator weakness, hoisting, slow movement, walking deviation, burning oil, etc. can be completed in a short time, saving maintenance waiting time for the owner.
3. Improper adjustment of the position of the spring (Spring). The diesel engine fuel pump (Deep well pump) governor is of RFD type, because the centrifugal force of the governor fly hammer is small during idling, so the governor The control force is also small. At this time, if the diesel engine decelerates rapidly, the fuel supply rack in the deep well pump may be pulled back beyond the idle position, so that the diesel engine stalls. In order to prevent this In this case, a speed-stabilizing spring is installed at the rear cover of the governor, which can quickly pull the fuel supply lever back to the idle position. The adjustment of the speed-stabilizing spring is performed after the idle speed is adjusted, that is, the speed-stabilizing spring is adjusted. The screw is screwed in 0.50mm to make the tail end of the rack contact the steady speed spring. Komatsu excavation machine maintenance When the diesel engine decelerates rapidly, the rack retracts and the tail compresses the steady speed spring, but the elasticity of the steady speed spring is very high Will soon push the gear rod in the direction of increasing fuel supply, so that the diesel engine is stable (explanation: stable and stable; there is no change) running in the idle position without stalling. Therefore, the steady speed spring must be adjusted to the correct position.
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