Slow Lifting Causes

1. Hydraulic issues:

• Low oil level/degraded oil

• Insufficient pump pressure (standard 14-17MPa)

• Control valve malfunction

2. Mechanical issues:

• Worn cylinder seals

• Lack of chain/rail lubrication

• Overload operation

  

Complete Lift Failure Causes

1. Hydraulic failures:

• Damaged oil pump

• Stuck relief valve

• Broken hydraulic lines

2. Electrical failures:

• Control circuit break

• Limit switch failure

3. Mechanical failures:

• Broken chains

• Bent cylinder rod

Quick Diagnostic Steps

1. Check oil level/quality

2. Test system pressure

3. Listen to pump operation

4. Inspect chain condition

Prevention Tips

• Regular oil changes (every 500 hours)

• Maintain chain lubrication

• Strictly avoid overloading

• Use winter-grade oil in cold weather

Tip: Immediate maintenance required when lifting speed decreases by 20%