Difficulty in starting the second-hand Caterpillar 320d
The case of August 8, 2020 tells you the troubleshooting process of a second-hand Caterpillar 320d excavator with difficult startup Generally, it is easier to start the excavator in summer, and there will be no trouble such as difficult to start in winter, so the machine owners will also save a lot of worry
Caterpillar 320d is difficult to start
However, there are exceptions to everything. Recently, a Caterpillar machine owner encountered a failure in starting the excavator, and the excavator must be started with the help of the machine starting fluid, which has a great impact on the construction efficiency. Let's take a look at how to solve the failure
Fault phenomenon:
The owner described that this Caterpillar 320d excavator is a second mobile phone bought by him. Usually, he and two other operators work in shifts. Recently, the construction period was delayed due to the heavy rain, so people stopped working and began to rush
At this juncture, it was difficult to start the machine. The owner could not find the fault point for a while, so he had to start the emergency measures first and hit the excavator with the starting fluid as an auxiliary
Fault analysis and Troubleshooting:
1. After the maintenance worker arrived at the site, he first used ET (Electronic Tester) to detect the common rail pressure of the engine. After accurate measurement, it was found that the pressure value was very small at the beginning of startup, and the value was about 1.6-1.8mpa
The maintenance master analyzed that there were two reasons for this situation: first, the high-pressure oil pump failed, which is also the common rail pump that we usually say. Second, the fuel injector itself failed
2. With the two fault causes analyzed, the maintenance worker immediately started the engine with the starting fluid and found that the common rail pressure value was normal, so the fault of the supply pump can be eliminated first
Caterpillar 320d is difficult to start
3. Next, the maintenance worker focused on the fuel injection nozzle. After the cylinder breaking test, it was found that the leakage of several fuel injection nozzles was too large. At this time, it can be determined that the fault phenomenon was caused by the problem of the fuel injection nozzle
Fault handling:
After replacing the faulty fuel injector and high-pressure oil pipe, the engine owner starts the excavator test again. At this time, the engine can be started smoothly! Caterpillar 320d is difficult to start and the fault is eliminated
Fault summary
Although the EFI machine has eliminated the hidden dangers of environmental protection for the owners, it is undeniable that the maintenance of the EFI machine not only requires a lot of energy, but also increases the cost!
In particular, the fuel injection nozzle of the EFI machine is the most expensive among the refined ones. The cost of changing it is not low. Therefore, we warmly remind all friends that they must not slacken their attention to the engine at ordinary times! If any abnormality is found, it must be dealt with at the first time, so as not to delay the fault and cause greater losses!
