Common Failures, Solutions, and Preventive Maintenance Techniques for Hydraulic Presses

Common Failures, Solutions, and Preventive Maintenance Techniques for Hydraulic Presses

Nadun Machinery Manufacture Co., Ltd. produces hydraulic press equipment widely used in manufacturing industries such as aerospace, nuclear power, petrochemicals, automotive components, bicycle parts, hardware products, instrumentation, medical equipment, household appliances, household utensils, sanitary kitchenware, and more.

Given the necessity of performing all heavy-duty operations on hydraulic presses, you may encounter some issues related to this machinery. Here are some common problems and how to solve and prevent them. This article from Nadun Machinery Manufacture Co., Ltd. presents common failures, solutions, and preventive maintenance techniques for hydraulic presses.

I. Common Problems and Solutions for Hydraulic Presses:

1. Oil Leakage:

   • One of the reported issues is oil leakage, where you may notice oil around plungers, hose end joints, and hydraulic pipelines.
   • Solution: Ensure the use of recommended oil for the hydraulic press, and ensure that all components are properly tightened.

2. Overheating:

   • Excessive pressure and friction, along with contaminated or degraded hydraulic oil, can lead to press overheating. The temperature of the hydraulic press should not exceed 150°F, as overheating may damage seal rubber.
   • Solution: Ensure you do not overstrain, regularly replace machine oil, and clean the filters.

3. Slow Pressure Accumulation:

   • Hydraulic presses should reach the required pressure level in about one second. If it takes longer, it indicates a pump problem, where fluid is not leaking into plungers fast enough, possibly due to leaks or dirt impurities.
   • Solution: Ensure to check the pump and surrounding mechanisms, such as overflow valves and motors, to ensure everything is normal and clean.

4. Abnormal Noise:

   • If you hear impacts or knocking sounds from the hydraulic press, it might be a sign of air in the fluid. You may also experience foam and abnormal actuator movements, lubrication loss, overheating, and component damage due to these issues.
   • Solution:
     1. Check fluid levels and ensure they are correct.
     2. Inspect pump shaft seals for leaks.

II. Four Techniques for Preventive Hydraulic Maintenance:

If you operate hydraulic equipment, proper maintenance is crucial. This doesn't mean paying attention only when errors are discovered. Preventive maintenance is essential for keeping hydraulic equipment running effectively throughout the year and can help you avoid expensive and prolonged repairs.

1. Check Fluid Levels and Replace as Needed:

   • One of the critical parts of the hydraulic system is the fluid, as it transfers pressure from one part of the system to another. Ensure that fluid levels are optimal and free of particles. Regularly check and replace fluid when necessary.

2. Inspect Filters and Replace as Needed:

   • Filters are crucial for keeping the liquid clean and viscous. Over time, hydraulic filters may become clogged. This is undesirable as it increases system pressure and may not allow hydraulic oil to move freely. Ensure to check hydraulic filters and replace them regularly according to the manufacturer's instructions.

3. Ensure Rated Values for Hoses and Valves:

   • Hydraulic hoses are indispensable for any hydraulic system. When selecting hydraulic hoses for your system, ensure they have been properly assessed for the temperature and pressure at which the system will operate. Regularly check hydraulic hoses and valves for any signs of cracks or deterioration.

4. Thoroughly Inspect Equipment for Issues:

   • Last but equally important, regularly conduct a thorough inspection of hydraulic equipment. Look for any working components or areas that need attention. If you cannot address the issues yourself, seek professional assistance.

Ensure you take care of your machinery and make the most out of it!