How should hydraulic cylinders be safely protected during the rainy season?

　　This year’s rainy season has already made its steady entrance, bringing us coolness and nourishment. As is often the case, the rainy season tends to be prolonged, with high ambient humidity that creates ideal conditions for bacterial growth—so much so that some people refer to it as the “mold season.” During this time, many items are particularly prone to damage, and hydraulic cylinders are no exception. Here, we’re focusing on outdoor‑use hydraulic cylinders; by contrast, those typically employed indoors or within machinery experience far less exposure to external environmental factors. However, when exposed to the outdoors—subject to rain, erosion, and other weather‑related influences—hydraulic cylinders can easily develop surface rust, accumulate moisture inside, and even allow residues to settle in the cylinder bore. So how can you ensure their safe protection? Below, we’ve outlined several key measures for your consideration.

　　1. Surface maintenance and care for hydraulic cylinders: Regularly touch up the paint before it begins to chip, which can effectively prevent damage caused by smog and environmental pollutants.

　　2. Hydraulic cylinders are inspected prior to shipment, with particular attention paid to the quality and reliability of the cylinder barrel, the piston rod, and the hydraulic fluid. These factors directly affect the service life of the hydraulic cylinder.

　　3. Monitoring the load capacity of hydraulic cylinders: Regardless of the application scenario, a hydraulic cylinder’s rated load capacity remains constant. It is essential to ensure that it operates within its specified load range to effectively safeguard the cylinder.

　　Common Problems with Hydraulic Cylinders and Their Repair Methods

　　After years of use, hydraulic cylinders often develop various issues. During operation, friction can cause internal surface scratches or microscopic cracks, leading to unpredictable behavior during movement. Additionally, hydraulic oil contamination—such as particulate matter and residual contaminants—can occur over time. Below, we’ve compiled several straightforward methods for diagnosing and repairing hydraulic cylinders.

　　1. Use an oxy‑acetylene flame to heat the scratched area (monitor the ambient temperature to prevent surface hardening), and burn off any oil that has long penetrated the metal surface, continuing until no sparks are flying.

　　2. Use a grinder to surface‑treat the scratched area, grinding and polishing down to a depth of approximately 1 mm. Then, along the slide rail, grind and polish to create a groove; a V‑shaped slot may be used. Drill holes on both sides of the scratch to increase weight and alter the stress distribution.

　　3. Use a cotton swab dipped in toluene or industrial ethanol to thoroughly clean the surface.

　　4. Apply the metal‑material repair compound to the scratched surface; ensure the first layer is thin, evenly distributed, and fully covers the scratch to promote strong adhesion between the material and the metal substrate. After spreading the compound over the entire repair area, press gently several times to compact it and achieve the desired thickness, thereby raising the surface of the proportioning rail.

　　5. At 24°C, the equipment must fully stabilize its various properties for 24 hours. To save time and effort, the ambient temperature can be raised using a halogen tungsten lamp; for every 11°C increase in ambient temperature, the curing time is halved. The recommended curing temperature is 70°C.

　　6. After the material has fully cured, use a fine-grit float or a scraper to smooth and level any excess material that protrudes above the rail surface, completing the construction process.

　　7. When using hydraulic cylinders, proper maintenance is essential; routine upkeep is just as critical and helps ensure the cylinder’s service life.