How to Test the Safety Mechanisms of a Mobile Scissor Lift?
Regular safety testing helps ensure that a mobile scissor lift is ready for operation. Before each work shift, operators should inspect the machine and test the main controls and protective systems according to the manufacturer's instructions. OSHA also recommends checking controls, guardrails, brakes, and other components before use.
The exact testing procedure varies by model, so always use the operator's manual for the specific machine.
Test the Emergency Stop
Mobile scissor lifts normally have emergency-stop controls at both the platform and ground control stations.
To test them:
- Turn on the machine.
- Activate a normal function.
- Press the emergency-stop button.
- Confirm that machine functions stop.
- Reset the emergency stop before continuing.
If any function continues after the emergency stop is activated, the machine should not be used until the problem is corrected. Genie function-test procedures similarly require that no functions operate when the emergency stop is engaged.
Check the Up and Down Controls
Test the platform lifting and lowering functions from the appropriate control station.
Confirm that:
- The platform raises smoothly
- The platform stops when the control is released
- The platform lowers normally
- The descent alarm operates, if equipped
- No abnormal noise or movement occurs
Do not continue operating if the lift moves unexpectedly.
Test the Function Enable System
Many mobile scissor lifts use a function-enable switch or similar control to prevent accidental movement.
Without activating the enable system, try operating the lift controls. The machine should not move.
Then activate the enable switch and confirm that the selected function operates normally.
Test Steering and Braking
Drive the machine slowly in a clear, level test area.
Check:
- Forward and reverse travel
- Left and right steering
- Smooth stopping
- Parking brake performance
- Unusual vibration or noise
The brakes should hold the machine securely when it is stopped. OSHA specifically includes brake condition among important scissor-lift maintenance checks.
Test the Tilt Protection System
The tilt system warns the operator when the machine is outside its approved level range.
Test this system only according to the manufacturer's procedure. Depending on the model, a tilt warning may activate an audible alarm, indicator light, or restrict certain functions.
Never attempt to test a tilt system by intentionally operating the lift on an unsafe slope.
Test the Pothole Protection System
Many compact mobile scissor lifts use pothole guards that deploy when the platform is raised.
Check that:
- The guards deploy correctly
- They are not damaged or obstructed
- The system responds as specified
- Related warning systems operate properly
Some Genie scissor-lift function tests specifically require verifying pothole-guard deployment during platform lifting.
Check Warning Alarms and Indicators
Test the available warning devices, which may include:
- Horn
- Descent alarm
- Tilt warning
- Overload warning
- Fault indicators
- Battery warning
- Safety-system indicators
If a warning light remains active or an alarm does not operate correctly, identify the problem before using the machine.
Check Guardrails and Entry Gate
Inspect the platform protection system before operation.
Confirm that:
- Guardrails are secure
- The entry gate closes correctly
- Fasteners are present
- No structural damage is visible
- The platform floor is clean and free of debris
Guardrails are an important part of scissor-lift fall protection and should remain in good working condition.
Test Emergency Lowering
If the machine includes an emergency-lowering system, test it according to the operator's manual.
The system should allow the platform to be lowered safely if normal power or control functions fail.
Operators and ground personnel should know where the emergency-lowering control is located before work begins.
When Should the Lift Be Removed from Service?
Do not use the scissor lift if you find:
- Emergency-stop failure
- Control malfunction
- Brake problems
- Damaged guardrails
- Failed tilt protection
- Pothole-guard problems
- Hydraulic leaks
- Electrical damage
- Abnormal alarms
- Structural damage
After repairs, the required inspection and function tests should be completed again before the machine returns to service.
Conclusion
Testing mobile scissor lift safety mechanisms should include emergency stops, lifting controls, steering, brakes, tilt protection, pothole guards, alarms, guardrails, and emergency lowering.
Regular function testing can help identify problems before the machine is used at height. Always follow the operator's manual because safety systems and testing procedures vary between models.
Contact Mantall for information about mobile scissor lift safety systems, operating manuals, working heights, platform capacities, and suitable models for your application.
