After confirming that the oil circuit is unblocked and there is no air in the diesel engine supply system, the cover plate of the oil pump can be removed, the operating handle can be moved, and the pull rod of the oil pump can be pulled to see whether the pull rod is flexible and whether the plunger spring is broken. Under the condition that the pull rod of the automatic feeding concrete mixer is flexible and the plunger spring is not broken, the diesel engine can be started to run at a moderate speed for 10 minutes. If the fire is still broken, a copper hammer can be used to gently tap the large nut of the fuel transfer pump, while listening to the sound of the diesel engine. If the sound is abnormal, it means that the piston and push rod of the fuel transfer pump are jammed for repair or replacement.
Remove the fuel injector assembly, rotate the crankshaft for several cycles, and water sprays out, indicating that the cylinder head and cylinder block have cracks or sand holes. In this case, you can explain to the user or report to the automatic feeding mixer company. After the low pressure oil flow is unblocked, the air in the oil circuit can be removed by the hand pump, and the air release screw of the pump head can be opened until there is no bubble, then the air release screw can be tightened.
The nozzle does not atomize, the plunger spring and spring seat of the oil pump are broken, stuck and do not work, or there is water in the diesel. Remove the nozzle assembly to check the opening pressure and atomization. If the nozzle assembly is normal, the user can use clean diesel oil to load it into a pot and use the oil circuit side connection method to test. Turn on the oil tank switch of the automatic feeding mixer truck, remove the oil inlet pipe of the oil transfer pump, and check the oil flow. If the oil flow is fast, it indicates that it is normal. If the oil flow is intermittent, check the oil circuit.
Correct operation steps of automatic feeding mixer
The correct flexible operation methods of the automatic feeding mixer can be summarized as follows: one light, two stable, three separated, four diligent, five coordinated and six forbidden.
One light: during the operation of the automatic feeding mixer, the heel is firmly against the cab floor, the foot plate is parallel to the accelerator pedal, and gently press the fuel pedal.
Second stability: During the operation of the automatic feeding mixer, the accelerator should always be stable. In general operation state, the throttle opening should be about 70%.
Three separations: During the operation of the automatic feeding mixer, the foot plate shall be separated from the brake pedal, and placed flat on the cab floor. Never step on the brake pedal. The automatic feeding mixer often works on uneven construction sites. If the foot always steps on the brake pedal, the body will move up and down, causing the driver to step on the brake pedal carelessly. In general, the engine condition and gear shifting shall be controlled by controlling the throttle deceleration. This not only avoids overheating of the braking system caused by frequent braking, but also brings convenience for fast speed increase of the automatic feeding mixer.
Fourth, during the operation of the automatic feeding mixer, especially during the shoveling operation, the bucket shall be filled with materials by cyclically pulling the lifting and bucket turning control levers under the condition that the accelerator is stable. The cyclic pulling of the lifting and bucket turning control levers is called "diligence". This process is very important and has a great impact on fuel consumption.
Five coordination: coordination refers to the coordination of lifting and bucket control lever. The general shovel digging process of the automatic loading mixer is to place the bucket flat on the ground and drive steadily to the material pile. When the bucket is parallel to the material pile and encounters resistance, the principle of lifting the boom first and then retracting the bucket shall be followed. In this way, the bucket bottom can be better protected from resistance, so as to give full play to the large digging force.
VI. Prohibitions: First of all, tire skidding is strictly prohibited. During the operation of the automatic feeding mixer, when encountering resistance, the fuel valve will often slip. This phenomenon is usually caused by the driver's improper operation, which increases fuel consumption and damages the tire. Secondly, it is forbidden to tilt the rear wheel. Due to the large digging force of the automatic feeding mixer, the driver is usually prone to the phenomenon of two rear wheels tilting off the ground if he/she does not operate properly in the process of digging solid original soil and stone hill. The landing inertia of the lifting action will cause the blade of the bucket to break and the bucket to deform; When the rear wheel is cocked up very high, it is also easy to cause cracks at the welding points of the front and rear frames and other structures, or even plate fractures. Third, it is strictly prohibited to impact the material pile. For shoveling and digging ordinary materials, the automatic feeding mixer can operate with gear II. Inertial impact to the material pile with gear above gear II is strictly prohibited. The correct method should be to change the gear to gear I timely when the bucket is approaching the pile to complete a shoveling process.