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In the wire harness manufacturing and cable processing industry, wire crimping machines, terminal crimping machines and supporting wire stripping machines are core production equipment that directly affect production efficiency, product qualification rate and long-term operational stability. Even high-quality automatic and semi-automatic models may encounter common failures during daily use, mostly caused by improper operation, poor maintenance, worn parts or incorrect parameter settings.
Instead of waiting for after-sales maintenance to cause production delays, most small and medium faults can be quickly diagnosed and fixed on-site with clear troubleshooting steps. Below, we list the most common issues of terminal crimping machines and wire stripping machines, their root causes, and step-by-step repair solutions to help you resume production smoothly and reduce downtime.
1. Poor or Loose Terminal Crimping (Most Common Fault)
Symptoms: Terminal and wire connection is loose, easy to pull off; crimping is uneven, with exposed copper wire or damaged insulation; crimping height does not meet standards.
Possible Causes:
•Crimping mold is worn, misaligned or not matched with terminal/wire specifications
•Crimping pressure setting is too low or unstable
•Wire feeding position is incorrect, or wire clamping claw fails to tighten
•Terminal material is unqualified, or wire gauge does not match terminal model
How to Fix:
1.Turn off the equipment first, check and replace worn crimping molds; re-align the mold to ensure consistent crimping position.
2.Adjust crimping pressure according to the manufacturer’s manual, test with sample terminals until the crimping is firm and intact.
3.Calibrate wire feeding and clamping components, adjust the gap of wire clamping claws to fix the wire stably without slipping.
4.Confirm wire and terminal matching parameters, replace unqualified raw materials to avoid compatibility issues.
2. Wire Stripping Failure (Common in Integrated Wire Stripping and Crimping Machines)
Symptoms: This fault often occurs on integrated wire stripping machine and terminal crimping machine models: incomplete insulation stripping, copper wire cut off, insulation layer scratched, or stripping length inconsistent.
Possible Causes:
•Stripping blade is dull, nicked or improperly positioned
•Stripping depth and blade retraction parameters are set incorrectly
•Wire type and thickness do not match machine settings
•Stripping mechanism is loose or poorly lubricated
How to Fix:
1.Replace worn or damaged stripping blades immediately; clean blade surface to remove debris and burrs.
2.Re-adjust stripping depth and retraction value: do not set blade retraction too large to avoid incomplete stripping, and avoid excessive depth to prevent copper wire damage.
3.Calibrate machine parameters according to actual wire AWG size and insulation material.
4.Lubricate moving parts of the stripping mechanism regularly, and fasten loose components to ensure stable operation.
3. Terminal Feeding Jam or Misalignment
Symptoms:Terminal crimping machine fails to feed terminals normally, terminal tape gets stuck, terminals are deformed or fed in wrong position, leading to production interruption.
Possible Causes:
•Terminal feeder track is blocked by debris or misaligned
•Feeding gear or sensor is faulty, insensitive or damaged
•Terminal tape is bent, or terminals are poorly arranged during production
•Feeding speed and crimping speed are not synchronized
How to Fix:
1.Clean the feeder track thoroughly, remove dust and metal debris, and re-align the track to ensure smooth terminal delivery.
2.Check feeding sensor and transmission parts: replace damaged sensors, adjust sensing distance, and repair faulty gears.
3.Replace deformed or damaged terminal rolls, and ensure correct installation of terminal tape.
4.Adjust feeding and crimping synchronization parameters to match running speed, avoid jamming caused by speed mismatch.
4. Machine No Response or Abnormal Noise & Vibration
Symptoms: Equipment cannot start, pedal or control panel is unresponsive; loud noise, severe vibration or abnormal sound during operation ofwire crimping machine.
Possible Causes:
•Power connection is loose, circuit is damaged, or emergency stop button is triggered
•Motor, bearing or transmission parts are worn, poorly lubricated or loose
•Machine is placed unevenly, or fixing screws are loose
•Internal components are stuck due to long-term lack of maintenance
How to Fix:
1.Check power cord, socket and internal wiring: reset emergency stop button, repair or replace damaged circuits and switches.
2.Lubricate bearings and transmission parts regularly; replace severely worn motors or accessories in time.
3.Place the machine on a flat and stable platform, tighten all fixing screws to reduce vibration and noise.
4.Establish a weekly maintenance routine: clean internal dust, check movable parts, and eliminate stuck faults in advance.
5. Incomplete Cutting or Wire Damage
Symptoms: Wire cannot be cut completely, burrs appear at the cutting end; copper wire is broken or damaged during stripping and crimping process.
Possible Causes:
•Cutting blade is dull or improperly installed
•Cutting pressure and stroke are set incorrectly
•Wire feeding position is deviated
How to Fix:
1.Replace dull cutting blades, and install them in correct position.
2.Adjust cutting pressure and stroke parameters according to wire thickness.
3.Re-calibrate wire feeding position to ensure accurate alignment with cutting and stripping parts.
Preventive Maintenance Tips to Reduce Failures
Most faults of terminal crimping machines and wire stripping machines can be avoided through regular maintenance, which greatly extends equipment service life and improves production efficiency:
•Clean the machine daily, remove metal debris, dust and resin residues
•Lubricate movable parts every 3-5 working days to reduce wear
•Check blades, molds and clamping parts weekly, replace worn parts in advance
•Train operators to use correct parameters and operation methods, avoid man-made damage
•Store equipment in a dry and clean environment, avoid moisture and corrosion
Conclusion
Efficient operation of wire crimping machines and terminal crimping machines is critical to wire harness production efficiency. Most common faults can be solved quickly with correct troubleshooting steps, without professional maintenance support. For complex electrical or structural failures, please contact your equipment supplier for professional after-sales service to avoid secondary damage.
If you are looking for reliable, low-failure and easy-maintenancewire stripping machine or terminal crimping equipment, our full-range models feature stable performance, user-friendly design and long-term durability, suitable for small-batch processing and large-scale automatic production lines.
Contact us today for a free equipment consultation and customized wire processing solution！
Post time: Mar-20-2026