Actuators keep motion systems moving, whether they are lifting equipment, adjusting furniture, positioning panels, or powering automated machinery. When an actuator stops working, the right next step is not always obvious. Some issues are simple electrical or mounting problems. Others point to internal damage, repeated overload, environmental exposure, or a unit that is no longer worth repairing. Before choosing repair or replacement, start with a practical check: what failed, how critical the application is, and whether the actuator can be serviced without creating a bigger reliability or warranty problem.
Why Linear Actuators Fail
Most actuator failures come from a few common causes:
- Electrical issues, such as loose wiring, inadequate power supply capacity, damaged connectors, faulty switches, or control box problems.
- Mechanical wear, including worn gears, bearings, lead screws, or internal components after long use.
- Overload or misuse, such as exceeding force ratings, duty cycle, stroke limits, or using the actuator to guide a load instead of only pushing or pulling it.
- Environmental exposure, including moisture, dust, corrosion, or debris entering the actuator housing.
- Poor mounting or alignment, especially side loading, binding, weak brackets, or an uneven motion path.
Troubleshoot These Basics Before You Decide
Before assuming the actuator itself has failed, check the full system around it.
| Symptom | Possible Cause | What to Check First |
|---|---|---|
| No movement | No power, loose wiring, failed switch, control issue, limit switch state | Check power source, wiring continuity, connections, and control output |
| Motor hums but rod does not move | Jammed load, stripped gear, overload, internal mechanical failure | Remove load if safe, inspect mounting, check for obstruction |
| Slow or weak movement | Voltage drop, undersized power supply, overload, friction, wear | Measure voltage at the actuator under load and confirm load is within rating |
| Jerky movement | Binding, misalignment, damaged brackets, unstable power | Inspect the motion path, brackets, wiring, and controller |
| Excess heat | Exceeded duty cycle, overload, high ambient temperature, electrical mismatch | Let the actuator cool, verify duty cycle and load requirements |
| Noise or grinding | Dry components, worn gears, bent shaft, debris, side load | Stop operation and inspect for mechanical damage or misalignment |
For electrical checks, review the linear actuator troubleshooting guide. If you are not receiving the expected voltage at the actuator, resolve the power or control issue before replacing the actuator.
Repair vs Replace: Quick Decision Table
| Choose Repair When | Choose Replacement When |
|---|---|
| The issue is minor, such as a loose connection, worn external part, or lubrication issue | The actuator has a bent shaft, burnt motor, stripped gears, corrosion, or repeated internal failure |
| Replacement parts are available and the actuator is designed to be serviced | The actuator is sealed, obsolete, or not practical to open without risking reliability |
| Repair cost is clearly lower than replacement | Repair cost approaches the price of a new actuator |
| Downtime is acceptable | Downtime is costly or the system must return to service quickly |
| The actuator is custom or difficult to source | A compatible replacement is available through the replacement finder |
| The application is low-risk | The actuator is used in a safety-critical, medical, industrial, or mission-critical system |
When Repair Makes Sense
Repair can be worthwhile when the failure is isolated, the actuator is serviceable, and the fix is unlikely to create repeat downtime. Examples may include replacing accessible components, correcting wiring, adjusting a limit switch, improving lubrication where the product design allows it, or fixing a mounting issue that caused binding.
Do not assume every electric linear actuator is repairable. Many sealed actuators are not designed for user service. Opening them may damage seals, compromise environmental/ingress protection, or void warranty coverage.
When Replacement Is the Better Choice
Replacement is usually the better path when the linear actuator has major mechanical or electrical damage, has failed more than once, or is no longer reliable enough for the application. It is also the stronger choice when the unit is discontinued, spare parts are unavailable, or the system cannot tolerate another unexpected shutdown.
Replacement is especially important when the original actuator was undersized or used outside its rated conditions. In that case, replacing it with the same model may repeat the same failure. Review the required load, stroke, speed, voltage, current draw, duty cycle, mounting points, and Ingress Protection rating before ordering a new actuator.
If the application involves outdoor exposure, vibration, high loads, frequent cycling, positional feedback, or advanced safety features, confirm the replacement actuator’s specification requirements against official product data before installation.
For applications that continue to evolve through new features and advancing technologies, replacing an existing actuator with a more capable model may provide greater long-term value than repairing it. An upgraded actuator can improve performance, expand system functionality, and extend operational life:
- Adding positional feedback: Actuators with Hall effect sensors, potentiometers, or other feedback systems enable position monitoring, programmable movement, and synchronized operation. This allows systems previously limited to basic extend-and-retract controls to support more advanced automation.
- Upgrading to a brushless motor: Brushless actuator models may require a compatible controller and more complex integration, but they typically offer higher duty cycles, reduced maintenance, and a longer service life than comparable brushed motor models.
- Moving from 12V to 24V: For the same power output, a 24V system draws approximately half the current of a 12V system. Lower current can reduce heat buildup and voltage drop while improving electrical efficiency, particularly in applications with longer cable runs or higher power requirements.
What to Check Before Ordering a Replacement
- Required stroke length
- Retracted and extended length
- Required force or load
- Voltage and current requirements
- Speed requirement
- Duty cycle requirement
- Mounting hole dimensions and bracket style
- Feedback requirement, if synchronization or position control is needed
- Environmental exposure, including dust, water, temperature, vibration, or corrosion risk
- Control method, such as a switch, relay, control box, remote, or automated controller
Use the Progressive Automations replacement finder to compare your existing actuator against compatible options. If the old actuator failed due to load, duty cycle, power supply, or mounting conditions, correct that cause before installing the replacement.
How to Extend Actuator Life
- Keep the actuator within its rated load, stroke, voltage, and duty cycle.
- Avoid side loading by guiding the load separately and keeping the actuator aligned.
- Use brackets and mounting points that do not flex under load.
- Protect the actuator from dust, moisture, corrosion, and debris.
- Match the power supply to the actuator’s voltage and current requirements.
- Inspect wiring, connectors, and control components during maintenance.
- Watch for early warning signs such as slower movement, heat, noise, vibration, or inconsistent travel.
- Review the linear actuator selection guide before replacing a failed unit in a demanding application.
FAQ
What should I check first if my linear actuator stops working?
Start with the power source, wiring, connections, switch or control box output, and visible obstructions. If the actuator receives the correct voltage and current but still does not move, the issue may be internal or mechanical.
Can a linear actuator be repaired?
Some linear actuators can be repaired if parts are available and the actuator is designed for service. Sealed actuators or units with major internal damage are often better replaced.
When is actuator replacement better than repair?
Replacement is usually better when the actuator has major damage, repeated failures, unavailable parts, high downtime cost, or uncertain reliability after repair.
Is it safe to open a sealed actuator?
Only open an actuator if the manufacturer’s documentation says it is serviceable and you are qualified to do the work. Opening a sealed actuator may compromise seals, ingress protection ratings, or warranty coverage.
What causes repeat actuator failure?
Repeat failure is often caused by overload, side loading, poor alignment, inadequate power supply, excessive duty cycle, moisture or dust ingress, or choosing an actuator that is not suited to the application.
What information do I need before replacing an actuator?
Confirm stroke, force, speed, voltage, current draw, duty cycle, mounting dimensions, control method, feedback needs, and environmental requirements before selecting a replacement.
Final Recommendation
Repair makes sense when the problem is minor, parts are available, and the actuator can be serviced safely. Replacement is the better choice when damage is significant, failures repeat, downtime is costly, or reliability is critical. If the root cause is overload, poor mounting, or electrical mismatch, fix that system issue before installing a new actuator.
If you have any queries or wish to discuss our products further, please do not hesitate to reach out to us! We are experts in our field and will be happy to assist in any way we can.
sales@progressiveautomations.com | 1-800-676-6123