The reasons why the movement speed of the hydraulic cylinder of the baler decreases may be the following:
1. Hydraulic oil pollution: Impurities, moisture and air in the hydraulic oil will reduce the working efficiency of the hydraulic system, thus affecting the movement speed of the cylinder. Regularly replace and filter the hydraulic oil to maintain the cleanliness of the hydraulic oil and help increase the movement speed of the cylinder.
2. Hydraulic pump performance decline: The hydraulic pump is the core component of the hydraulic system, and its performance directly affects the movement speed of the cylinder. After long-term use, the hydraulic pump may suffer from wear, aging and other problems, resulting in a decrease in its performance. Regular inspection and maintenance of the hydraulic pump to ensure its normal operation will help increase the movement speed of the cylinder.
3. Hydraulic valve failure: The hydraulic valve is a key component that controls the flow direction and flow of hydraulic oil. If the hydraulic valve fails, such as blockage, wear, etc., it may cause the hydraulic oil to flow poorly, thus affecting the movement speed of the cylinder. Regularly checking and cleaning the hydraulic valve to ensure its normal operation will help increase the movement speed of the cylinder.
4. Seal wear: The seals of the hydraulic cylinder may suffer from wear, aging and other problems after long-term use, resulting in hydraulic oil leakage and thus affecting the movement speed of the cylinder. Regularly check and change seals to ensure good sealing performance of the cylinder, which will help increase the movement speed of the cylinder.

5. Insufficient system pressure: The pressure of the hydraulic system directly affects the movement speed of the cylinder. If the system pressure is insufficient, the movement speed of the cylinder may decrease. Checking the working pressure of the hydraulic system to ensure it is within the normal range will help increase the movement speed of the cylinder.

In short, to maintain the movement speed of the baler's hydraulic cylinder, the hydraulic system needs to be inspected and maintained regularly to ensure the normal operation of each component. At the same time, pay attention to the cleanliness of the hydraulic oil and the working pressure of the hydraulic system to increase the movement speed of the cylinder.