The hydraulic system is the core of an injection molding machine's operation. When hydraulic circuit failures occur—especially when the oil pump fails to deliver oil—it can lead to complete machine shutdown and significant production losses. Today, we systematically break down the common causes and solutions for this type of failure, helping you get back to production quickly.
The failure of the oil pump to deliver oil is a frequent issue in injection molding machine hydraulic systems and can stem from various causes. Based on maintenance experience, we recommend troubleshooting in the following order:
1. Incorrect Pump Rotation Direction
Symptom: Pump shaft does not rotate or rotates in reverse.
Solution: Check the motor wiring to ensure the rotation direction matches the pump's indicated direction.
2. Suction Line Issues
Symptom: Suction line is cracked, clogged, or pinched.
Solution: Inspect the line for damage. Clean, repair, or replace the suction line as needed.
3. Low Oil Level or Poor Oil Condition
Symptom: Low oil pressure in the tank, leading to pump cavitation.
Solution: Refill the hydraulic oil to the proper level. Check oil cleanliness and replace if contaminated.
4. Incorrect Installation Height
Symptom: Pump installed too high, making suction difficult.
Solution: Adjust the pump's installation position to ensure it is within the allowable suction height range.
5. Clogged Filter Element
Symptom: Restricted oil flow causing poor pump suction.
Solution: Replace the filter element and verify it is the correct type and properly installed.
Regularly check oil quality and level to keep the hydraulic system clean.
Replace filter elements on schedule to prevent blockages and subsequent failures.
Document failure symptoms and corrective actions for future troubleshooting and prevention.
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