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The excavator's work site was not far from the town, and the two of them hurried to the construction site within a few minutes.

Two middle-aged men were watching the engine of an excavator covered in sludge, discussing something in a low voice, their faces visibly full of melancholy.

"Dad, uncle, I invited my classmates." Chai Xiande walked over and said loudly to the two anxious men.

Peng Huading shouted to one of them, Uncle Chai, and then asked in a low voice, "Uncle Chai, do you know the reason for the failure?" ”

Chai Xiande's father rubbed his oily hands and said, "I don't know." ......, anyway, the grab can't dig in when digging the dirt, and if it's a little full, the grab can't be lifted. ”

Before Peng Huading saw the excavator, his heart was indeed a little empty, but after seeing the excavator, he was relieved a lot. With high mechanical and electrical knowledge, he can see at a glance that the principle of the excavator is not complicated, simply put, the motor drives the hydraulic pump to output high-pressure oil, and the high-pressure oil drives the cylinder to drive the grab to work.

He looked around the excavator and said to Chai Xiande's father: "Uncle Chai, please turn on the motive, try to dig a few times, and let me see the situation." ”

Father Chai was about to climb into the cab when he saw a man in a suit with a beer belly striding over with a flashlight. Before the person arrived, he shouted with a big grin: "Old chai, has the excavator been repaired?" I can tell you, if it can't be repaired today, I'll let other excavators enter the site tomorrow, and we can't wait for you. ”

Chai Xiande's father didn't care about the test plane, so he hurriedly greeted him, and said cautiously while handing over the cigarette: "Manager Wang, it's fast, it's repaired!" ......, actually, we're just moving a little slower......"

The manager of the beer belly king pushed away Chai's father's cigarette and said, "Bullshit! What's about to be fixed? It's been two days since I told me, why hasn't it been repaired yet. Are you just moving a little slower? When people install three cars, you only load one car. I'm not an excavator mechanic, but I know there's something wrong with your excavator and you have to overhaul it right away. If you delay it again and again, not only will we not want you to do it, but your own excavator will also be damaged, and it will only cost more than 10,000 yuan to repair, maybe it may take tens of thousands of yuan to repair, and the gains outweigh the losses, Lao Chai. ”

Chai Xiande's father obviously knew this reason, but he was really unwilling to ask him to give up this hard-won project immediately, and he hesitated and didn't know how to say it.

After all, the other party is also reasonable, people also have to rush the construction period, and those drivers who drive loading trucks are not willing to wait for the excavator with insufficient power, the time to wait here is three times that of other excavators, and it consumes fuel and delays making money, who will do it?

Seeing that Chai Xiande's father was weak and didn't speak, the manager of the beer belly king stretched out his palm and shook it, and said: "Lao Chai, for the sake of the fellow countrymen, I will give you another day, if it is not repaired before tomorrow afternoon, and the action of digging the soil is still so slow, don't blame my surname Wang for being unreasonable." You'll have to get out of the way and get someone else's excavator to come over, I'm not going to wait for you anymore. I have a time limit for contracting this foundation, and if the construction period is delayed, you can't afford to pay for it, and I can't afford to pay for it. ”

Watching the other party walk away, Chai Xiande's father squatted on the ground in annoyance.

Chai Xiande pursed his lips and said to Peng Huading: "Peng Huading, you help us take a look at the machine." ......, you have also seen that the situation is already like this, don't worry about not repairing it, we listen to you. ”

Chai Xiande's uncle whispered to Peng Huading next to him: "Xiao Peng, have you studied excavators in college?" ”

Peng Huading wanted to shake his head, but when he saw Chai Xiande squeezing his eyebrows, he said: "I have learned a little, although I can't guarantee that I can fix it now, but I can find out the problem." When the problem is clear, we will find a solution together, and there is always hope for a solution. ”

If the parts in the excavator are broken, he doesn't dare to guarantee that it will be repaired even if he is a god, so he can only find another way.

Chai Xiande's uncle said worriedly: "We have asked the maintenance master in the town to see it, and they said that they must be sent to the designated maintenance point in the city for maintenance, and it needs to be overhauled." If you're not sure, forget it. Anyway, the loss of money this time has already been lost, and it will be even more troublesome if you can't even move the car by then. It's hard to get on a truck and transport it away......"

Peng Huading knew that it was not that he looked down on him, but that he did not give him enough confidence, and the technician in the town had already asserted, so he was worried that Peng Huading would repair the excavator instead.

However, Chai Xiande's father was different, and when he heard that Peng Huading could find out the cause of the problem, his confidence couldn't help but increase, and he hurriedly climbed into the cab and quickly activated his motivation.

The sound of the motive is normal, and the grab seems to be powerful when it is unloaded, and the rotation is also flexible.

But when the teeth of the grab drill into the soil, the excavator shows a weak original shape, the grab can not dig in, and finally dig half the distance of the grab, but the grab is unable to pull out the soil in the bucket......

Chai Xiande's father straightened the grab a little to let the grab exit without load, and then turned off the engine after the grab was suspended in mid-air, and jumped out of the cab. With a helpless face, he said, "That's it." In the past, when it was good, you could grab a full bucket of soil, but now you can grab half a bucket at most. ......, what do you see the reason? ”

Peng Huading basically had a spectrum in his heart, and said: "There are two possibilities for this situation. The first possibility is that the main pressure oil pump does not output the rated strength of hydraulic oil to the drive mechanism. Another possibility is that the main cylinder that drives the bucket does not have enough power to drive the bucket to excavate, retract and lift the bucket with a large load. ”

Seeing what Peng Huading said, the three people next to him were a lot happier, and asked in unison, "What kind of situation is that?" ”

Peng Huading said: "Now the grab can be lifted high, and there is no falling, indicating that the main cylinder is good, at least in the circuit from the self-locking hydraulic valve to the main cylinder, there is no major leakage, and there is no major leakage inside the main cylinder." In this case, let's first look at the system overflow pressure of the main pressure oil pump, if the relief valve that adjusts the oil pressure is not set accurately, we only need to adjust the constant pressure bolt of the relief valve. If the relief valve is set correctly, we need to check the main pressure oil pump for internal leakage. This repair was very difficult, and the entire hydraulic system had to be overhauled. ”

Listening to Peng Huading's words, Chai Xiande's father and uncle's faces decreased a trace of worry.

Chai Xiande hurriedly said: "Old classmate, help us take a look." You say you want to do it, and we will do it. ”

The excavator is not a complicated thing at all in Peng Huading's heart, he didn't pay attention to it before, so he didn't know it, but now after observing it for so long, he quickly figured out how it works and knows the function of most of the parts.

He flipped through the excavator's workbook a little, and began to confidently command the three of them to disassemble the casing, removing one component after another.

Seeing Peng Huading's command and orderly, the three people who were sweating were very surprised, and they wondered how Peng Huading was so familiar with the excavator. They have heard that to disassemble the excavator, even the maintenance master will take two days, and only with the help of special tools.

But now Peng Huading with a few commonly used tools, quickly dismantled the complex parts inside, each nut, bolt loosening is just right, where you need to completely unscrew out the nut or bolt to take away, where the bolt is only unscrewed a little bit, where the oil valve must first release the oil, first take which tube of oil pipe is not in the way,......, these seem to have a set of strict procedures in his heart, there is nothing wrong at all.

"Even the familiar mechanic doesn't know as much as he does, right? He really didn't learn to build excavators? Several people were surprised and admired, and they were full of confidence that Peng Huading could repair the excavator.

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