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What is the reason and solution of mini trench excavator's forearm jam

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  • Time of issue:2021-07-12 17:07
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(Summary description)What is the reason for the stuttering of the forearm of the mini trench excavator? How to solve? The mini trench excavator manufacturer will take you to understand how to solve the forearm jam of the mini trench excavator.

What is the reason and solution of mini trench excavator's forearm jam

(Summary description)What is the reason for the stuttering of the forearm of the mini trench excavator? How to solve? The mini trench excavator manufacturer will take you to understand how to solve the forearm jam of the mini trench excavator.

  • Categories:NEWS
  • Author:
  • Origin:
  • Time of issue:2021-07-12 17:07
  • Views:
Information

What is the reason for the stuttering of the forearm of the mini trench excavator? How to solve? The mini trench excavator manufacturer will take you to understand how to solve the forearm jam of the mini trench excavator.

good price and quality mini trench excavator
The mini trench excavator appeared during the recent construction process. When the forearm of the machine was recovered to such an angle perpendicular to the ground, there was an obvious pause. This abnormal phenomenon caused the owner to pay great attention.
The failure points and the analysis reasons are as follows:
1. The mini trench excavator is designed in the forearm recovery oil circuit and added a regeneration function. A brief introduction to the benefits of the regeneration function is to prevent the forearm cylinder from extending too fast under the action of the forearm's own weight during the forearm recovery. As a result, cavities are generated in the cylinder, which will cause adverse effects. On the other hand, it is necessary to prevent the forearm from stalling and increase the recovery speed of the forearm.
 2. The key point is that this function is realized by the one-way valve in the spool and the arm regeneration valve. With this, we should focus on these two parts.
3. Back to the working principle of the mini trench excavator, when the owner selects the excavation construction mode, the regeneration valve spool is in the throttle position to limit the oil return of the rod cavity of the cylinder. When the oil pressure of the rod cavity is higher than the oil pressure of the rodless cavity, the one-way valve in the valve core opens, so that the oil return from the rod cavity is returned to the rodless cavity to realize the regeneration function.
4. Therefore, through the above introduction, everyone will easily understand that if the regeneration valve spool cannot be in the throttle position or the one-way valve in the spool cannot be opened smoothly, the regeneration function in the forearm circuit cannot be realized, thus Causes a pause when the forearm is in a vertical position.
Maintenance process of mini trench excavator:
    Based on the analysis of the above working principle, the engineer checked the spool of the regeneration valve and the pilot oil circuit step by step. No abnormal fault was found. The cause can be eliminated immediately. When the maintenance master inspected the check valve in the spool, he found that the orifice at the front end of the check valve could not be opened due to foreign matter blocking the check valve, which eventually caused this failure.
Mini trench excavator processing method:
Because the orifice was blocked due to foreign matter, the failure occurred, and there was no other abnormal wear, so you only need to thoroughly clean the orifice and then re-test the vehicle. It is found that the recovery arm pause phenomenon does not reappear, indicating that the failure has been resolved.
Mini trench excavator summarizes: The machine will not lie and will not tease the owners. Once you find any abnormal faults in your love machine, don’t take a fluke. Take advantage of minor faults and repair them immediately, regardless of whether it is maintenance costs or time-consuming. Will reduce a lot!

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