The second-hand Hitachi 270-3 boom pin shaft makes strange noises. Is it still careless to butter it?
Speaking of the abnormal noise of the excavator, I believe many aircraft owners are full of bitterness! Because in the construction life, the abnormal noise is almost accompanied by everyone, especially when the machine is older, the large pump makes abnormal noise, the engine makes abnormal noise, and sometimes the hidden abnormal noise is mixed with the construction roar of the machine, which is really difficult to recognize.
Today, we will talk about the boom abnormal noise, which is very common in construction life. Of course, this fault has puzzled many old drivers. Let's take a look at the fault analysis and solution process.
Fault phenomenon:
It is reported that this Hitachi 270-3 excavator is a second mobile phone purchased. The owner of the excavator has not invested much in maintenance. It was only recently that the boom pin shaft made abnormal noise during construction.
Although the construction state of the machine was not greatly affected, the owner of the machine was slightly disturbed by the strange noise, so he contacted the maintenance master for maintenance.
Fault analysis:
In view of the fact that this Hitachi 270-3 excavator is a second mobile phone purchased by the company and has a long year, and the owner himself said that he has not invested a lot of energy and financial resources in maintenance, the analysis is as follows:
1. No pure butter is used, or the butter used has no quality assurance at all, and most of them are relatively cheap "three noes" 名媛直播 on the market.
2. The failure to butter on time is a key reason. It is estimated that the owner did not pay attention to the fact that the basic condition of the machine can only be guaranteed if the butter is buttered on time and in place.
3. Is the grease fitting blocked? If there are sundries and impurities blocking the grease fitting, and the butter is not properly applied at ordinary times, the fault point can not be ignored.
4. Wear of shaft sleeve and seal ring is also common, so it cannot be ignored during maintenance.
Maintenance process:
1. Check whether the grease fitting of boom pin shaft is in good condition. If the grease on the pin shaft is dry, it means that the grease lubrication is not in place. Retract the bucket cylinder and stick cylinder, and lay the bucket on the ground.
2. Lift the boom gently with a crane, remove the pipelines and lines connected with the boom platform, remove the pin shaft connected between the boom cylinder and the boom, and use a pin puller to pull out the pin shaft of the boom.
3. Lift the boom and replace the shaft sleeve, seal ring and pin shaft damaged due to dry grinding.
4. Assemble the boom, oil pipe, line and boom cylinder, and handle the fault.
Fault cause:
In fact, the cause of this fault is basically the same as our analysis. Because the grease lubrication and maintenance are not in place, the boom pin shaft can not be lubricated and the pin shaft is dry ground. Only then can we hear bursts of abnormal noise!
summary
In fact, this situation is not an example in real life. On the one hand, many owners have limited energy to maintain the machine. In addition, the machine is slightly older, or the second mobile phone they bought is far less attentive to maintenance than the new one they just bought.
Carelessness in maintenance is equivalent to an opportunity for faults to sneak in. I also hope this article can remind all aircraft friends that butter lubrication seems to be unimportant, but it is actually a cheap and economic method, which must not be ignored!
