The cylinder seems to be a little pressure-dropping, but it does not leak oil. Is it internal leakage? How to judge and repair it? When the cylinder piston rod reaches out and moves back, it drops pressure. Only when the piston rod reaches the load, the pressure will rise. Can the system pressure rise when the cylinder is moving slowly and not moving? Can you be sure that the reversing valve does not leak? Is there a speed regulating valve? The expression of your question is not perfect either. You'd better go to the oil road map. There are many polyurethane seals on piston. Generally, two seals are needed for back-to-back installation, with a guide belt in the middle. If it's a Gray Ring Seal, install one in the middle of the piston, and the guide belt is on both sides of the piston.

Below is a brief introduction and knowledge sharing of our company on Paver accessories series.

1. Why do I have to buy the lifting cylinder of Trinity DTU90 paver right now? Why can't I put it off until later?

Answer: I believe you know more about paver than we do. Procrastination will only hurt the machine more, so the cost of maintenance will be higher. In addition, if the machine fails, it will affect the progress of the project if it is not repaired in time. If there are any major problems with the machine, you can also prepare the goods first, so as to avoid unexpected situations and affect the progress of the project, and our company has special activities during this period, why don't you buy the fragile parts first when the price is low, so as to reserve them for later use?

2. The reason of hydraulic cylinder ringing?

Answer: 1. Air intrusion into hydraulic system is the main cause of noise. 2. Relief valve is unstable. For example, due to improper matching between slide valve and valve hole, or the contact between cone valve and valve seat is blocked by dirt, the damper hole is blocked, the spring skews or fails to move in the valve hole, which causes pressure fluctuation and noise of the system. 3. Improper adjustment of the reversing valve causes the spool of the reversing valve to move too fast, resulting in reversing impact, resulting in noise and vibration. 4. Mechanical vibration, such as slender tubing, many elbows without reinforcement, can easily cause pipe jitter when oil flows through, especially when the flow rate is high; unbalance of rotating parts of motor and hydraulic pump, bad alignment in installation, or loosening of coupling, etc., can produce vibration and noise.

3. What's the reason why the hydraulic cylinder is dull and slow to rise?

Answer: It is likely that the leakage in the cylinder is serious. Check whether the sealing devices in the cylinder are in good condition, whether there are scratches and scratches, etc. In addition, there is also the blockage of the oil pipeline, check whether the filters are dirty, whether the indicators of oil pollution exceed the standard, and so on.