1、 Precautions during installation phase

1. Verticality and levelness calibration
   • Before installation, it is necessary to check the perpendicularity of the oil cylinder piston rod to the direction of movement, in order to avoid seal wear or piston rod bending caused by installation inclination.
   • For horizontally installed oil cylinders, it is necessary to ensure that the extended end of the piston rod is on the same axis as the load connection point to prevent lateral force from damaging the seal.
2. Cleanliness Control
   • Clean the inside of the oil cylinder and connecting pipelines before installation to prevent impurities (such as metal shavings and sand particles) from entering the hydraulic system and scratching the seals or inner walls of the cylinder.
   • Wipe with specialized cleaning agent and lint free cloth, and if necessary, flush the pipeline with low-pressure hydraulic oil.
3. Connection fastening and anti loosening
   • The bolt connection should be tightened in diagonal order in stages to ensure even force distribution and prevent oil leakage or loosening.
   • In a vibrating environment, anti loosening devices (such as spring washers and locking nuts) need to be installed.
4. Exhaust treatment
   • After installation or long-term shutdown, slowly operate the oil cylinder to the end of the stroke, repeat 2-3 times to exhaust the air inside the cylinder and avoid cavitation.

2、 Precautions during use

1. Load and speed control
   • Avoid overloadingIt is strictly prohibited to use beyond the rated load of the oil cylinder, otherwise it may cause seal failure, cylinder deformation, or piston rod bending.
   • uniform motionAvoid rapid start stop or frequent reversing to reduce hydraulic shock damage to the oil cylinder.
   • Low speed anti crawlingWhen running at low speeds (such as<5mm/s), it is necessary to ensure that the cleanliness of the hydraulic system meets the standard to prevent crawling caused by uneven frictional resistance.
2. Temperature management
   • Working temperature rangeThe temperature of hydraulic oil is generally controlled between 40-60 ℃. Exceeding 80 ℃ will accelerate the aging of seals and reduce lubrication performance.
   • Adaptation to environmental temperatureIn high or low temperature environments, it is necessary to use heat-resistant sealing materials (such as fluororubber, silicone rubber) or install cooling/heating devices.
3. Selection and maintenance of hydraulic oil
   • Oil cleanlinessRegularly check the oil contamination level (NAS1638 standard) to ensure it is ≤ NAS9 level and prevent particle wear.
   • Viscosity matchingChoose hydraulic oil with appropriate viscosity based on the ambient temperature (such as HV low-temperature hydraulic oil used in winter).
   • regular replacementReplace the hydraulic oil and filter element according to the equipment manual to avoid oil oxidation and deterioration.
4. Corrosion and dust prevention
   • In humid or corrosive environments, the outer surface of the oil cylinder should be coated with anti rust paint, and the surface of the piston rod should be plated with hard chromium or sprayed with anti-corrosion coating.
   • Install dust rings or protective covers to prevent dust and moisture from entering the cylinder.

3、 Precautions during maintenance phase

1. Regular inspection and lubrication
   • Seal inspectionCheck the wear of the seals every 3-6 months, and replace them promptly if leaks or aging are found.
   • Piston rod lubricationRegularly apply high-temperature resistant grease (such as lithium based grease) to reduce friction and wear.
   • Guide sleeve gapCheck the clearance between the guide sleeve and the piston rod, and replace the guide sleeve if it exceeds the standard value.
2. Cylinder inner wall detection
   • Use an endoscope or ultrasonic detector to check for scratches and corrosion on the inner wall of the cylinder. Minor damage can be repaired by grinding, while severe damage requires replacement of the cylinder.
3. Piston rod straightening
   • If the bending degree of the piston rod exceeds 0.1mm/m, it needs to be straightened by a press or replaced with a new rod to avoid eccentric wear of the seal.
4. inventory management
   • Long term stored oil cylinders should be placed horizontally, with the piston rod retracted into the cylinder and coated with anti rust oil. They should be started every 6 months to prevent seal adhesion.

4、 Precautions for fault handling

1. Leakage handling
   • External leakageCheck if the seals are damaged and if the connecting bolts are loose. After replacing the seals, it is necessary to exhaust them again.
   • Internal leakageCheck the sealing between the cylinder and piston through pressure testing. If the internal leakage exceeds the standard, it needs to be disassembled and repaired.
2. Crawling and shaking
   • Check for hydraulic oil contamination, air mixing, or uneven load, clean the system, and replace the filter element.
3. slow in movement
   • Check the viscosity of hydraulic oil, flow rate of oil pump or valve group blockage, adjust the oil temperature or clean the valve components.
4. Abnormal noise
   • It may be caused by hydraulic shock, cavitation, or loose components, and it is necessary to reduce the operating speed or check the fixing bolts.

5、 Safety operation standards

1. It is strictly prohibited to disassemble under pressureBefore maintenance, the system pressure must be released to prevent high-pressure oil from spraying out and injuring people.
2. personal protectionWear goggles and gloves during operation to avoid contact between hydraulic oil and skin or eyes.
3. Fire and explosion preventionUse explosion-proof hydraulic oil in flammable environments, keep away from sources of fire, and equip with firefighting equipment.
4. Professional repairNon professionals are not allowed to disassemble the oil cylinder without authorization to avoid performance degradation or safety accidents caused by assembly errors.