Quick Answer
Injection molding machines may experience problems such as:
- Hydraulic oil leaks
- Unstable injection pressure
- High oil temperature
- Servo motor alarms
- Long cycle times
- Material feeding issues
- Excessive energy consumption
Most problems can be prevented through proper maintenance, regular inspections, and timely replacement of worn components.
Why Do Injection Molding Machines Develop Problems?
Injection molding machines operate under:
- High temperatures
- High hydraulic pressure
- Continuous mechanical movement
- Long production hours
Over time, wear, contamination, improper settings, and lack of maintenance can lead to machine failures.
Identifying problems early helps reduce downtime and repair costs.
Problem 1: Injection Pressure Is Unstable
Common Symptoms
- Short shots
- Flash defects
- Inconsistent product weight
- Poor repeatability
Possible Causes
- Hydraulic oil contamination
- Worn hydraulic pump
- Servo control issues
- Injection valve wear
- Incorrect process settings
Recommended Solutions
✓ Check hydraulic pressure stability
✓ Inspect hydraulic pump condition
✓ Verify servo system operation
✓ Replace worn valves if necessary
✓ Review injection parameters
Problem 2: Hydraulic Oil Leakage
Common Symptoms
- Oil on machine floor
- Low oil level
- Reduced hydraulic performance
Possible Causes
- Damaged seals
- Loose fittings
- Aging hydraulic hoses
- Excessive system pressure
Recommended Solutions
✓ Tighten hydraulic connections
✓ Replace damaged seals
✓ Inspect hydraulic hoses
✓ Check system pressure settings
Small leaks should never be ignored because they often become major failures.
Problem 3: High Hydraulic Oil Temperature
Common Symptoms
- Oil temperature alarms
- Slower machine response
- Reduced production stability
Possible Causes
- Blocked cooling system
- Dirty heat exchanger
- Contaminated hydraulic oil
- Excessive machine load
Recommended Solutions
✓ Clean cooling system
✓ Inspect water flow
✓ Check oil condition
✓ Verify hydraulic pump performance
Maintaining proper oil temperature improves component lifespan.
Problem 4: Machine Cannot Build Pressure
Common Symptoms
- Injection failure
- Low clamp force
- Incomplete mold filling
Possible Causes
- Hydraulic pump wear
- Pressure relief valve malfunction
- Hydraulic leakage
- Servo motor issues
Recommended Solutions
✓ Inspect hydraulic pump output
✓ Check pressure valves
✓ Inspect hydraulic circuit
✓ Verify servo drive status
Pressure loss should be diagnosed quickly to prevent production interruptions.
Problem 5: Servo Motor Alarm
Common Symptoms
- Servo drive fault messages
- Machine shutdown
- Unstable operation
Possible Causes
- Encoder faults
- Motor overheating
- Drive communication errors
- Voltage fluctuations
Recommended Solutions
✓ Review alarm codes
✓ Check cooling fans
✓ Inspect power supply stability
✓ Verify encoder connections
Modern servo systems provide alarm histories that help identify root causes.
Problem 6: Machine Is Consuming Too Much Electricity
Common Symptoms
- Rising utility costs
- Increased oil temperature
- Reduced energy efficiency
Possible Causes
- Worn hydraulic components
- Poor maintenance
- Incorrect process settings
- Inefficient cooling systems
Recommended Solutions
✓ Inspect servo system efficiency
✓ Check hydraulic pump condition
✓ Optimize processing parameters
✓ Maintain cooling systems
Energy consumption often increases gradually as components wear.
Problem 7: Screw Does Not Feed Material Properly
Common Symptoms
- Inconsistent shot size
- Material starvation
- Long plasticizing time
Possible Causes
- Screw wear
- Barrel wear
- Material contamination
- Hopper blockage
Recommended Solutions
✓ Inspect screw and barrel condition
✓ Clean feeding system
✓ Verify material quality
✓ Check hopper operation
Severe screw wear may require replacement.
Problem 8: Machine Cycle Time Suddenly Increases
Common Symptoms
- Reduced production output
- Longer cooling times
- Lower efficiency
Possible Causes
- Cooling system problems
- Hydraulic performance loss
- Servo system issues
- Mechanical wear
Recommended Solutions
✓ Check cooling water flow
✓ Inspect hydraulic system
✓ Review machine parameters
✓ Analyze production data
Unexpected cycle time increases often indicate developing machine problems.
Problem 9: Excessive Machine Vibration
Common Symptoms
- Abnormal noise
- Machine shaking
- Reduced precision
Possible Causes
- Loose components
- Hydraulic instability
- Pump wear
- Machine leveling problems
Recommended Solutions
✓ Tighten loose fasteners
✓ Inspect hydraulic system
✓ Check machine foundation
✓ Verify machine leveling
Ignoring vibration may accelerate component wear.
Problem 10: Frequent Product Defects
Common Symptoms
- Flash
- Short shots
- Burn marks
- Dimensional variation
Possible Causes
- Machine instability
- Mold problems
- Material issues
- Incorrect process settings
Recommended Solutions
✓ Verify machine performance
✓ Check mold condition
✓ Review processing parameters
✓ Inspect material quality
Machine troubleshooting should always consider mold and material factors as well.
How to Prevent Most Injection Molding Machine Problems
Most machine failures can be prevented through:
Daily Inspection
- Oil level checks
- Leak inspection
- Safety verification
Weekly Maintenance
- Cleaning
- Cooling system inspection
- Lubrication checks
Monthly Maintenance
- Hydraulic inspection
- Servo system evaluation
- Mechanical wear inspection
Annual Preventive Maintenance
- Oil analysis
- Filter replacement
- Full machine inspection
Preventive maintenance remains the most effective method for reducing downtime.
How DAYAMAC Supports Machine Troubleshooting
DAYAMAC, the injection molding machine division of DAYA MACHINERY, supports manufacturers worldwide with:
- Injection molding machine spare parts
- Screw and barrel replacement
- Hydraulic system components
- Servo system parts
- Maintenance consultation
- Technical troubleshooting support
Our team helps customers improve machine reliability and reduce production downtime.
Common Questions
What is the most common injection molding machine problem?
Hydraulic oil leaks, pressure instability, and overheating are among the most common issues.
Why is my machine losing pressure?
Possible causes include pump wear, valve problems, hydraulic leakage, or servo system faults.
How can I reduce machine downtime?
Implementing a preventive maintenance program is the most effective solution.
How often should machine problems be investigated?
Any abnormal condition should be investigated immediately to prevent larger failures.
Can preventive maintenance prevent most machine failures?
Yes. Most major failures develop gradually and can often be detected through regular inspections.
Contact DAYAMAC
Looking for injection molding machine spare parts or troubleshooting support?
DAYAMAC provides:
- Spare parts supply
- Screw and barrel solutions
- Hydraulic components
- Servo system support
- Technical consultation
- Preventive maintenance guidance
Contact our team for professional injection molding machine support and industrial sourcing solutions.