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Jul. 10, 2026
Many international customers worry about cross-border after-sales support before importing pneumatic grippers. As a leading Chinese brand with 10 years of experience specializing in pneumatic gripper production, Fouk Gripper has summarized the most common post-purchase issues. This guide is designed to help you quickly troubleshoot malfunctions or perform routine maintenance on your air grippers.
Abnormal opening and closing of a pneumatic gripper typically stems from the following scenarios:
Gripper Jamming / Sticking: If the pneumatic gripper gets jammed, check whether dust accumulation has seized the slider. In this case, we recommend cleaning, repairing, and scheduling regular maintenance for the air gripper. If iron filings or cutting fluid have penetrated the guide rails—causing insufficient lubrication—clean the components, re-lubricate or replace the grease, optimize the air-blow dust prevention system, and consider implementing a dust-proof structure. Alternatively, if the issue is caused by a worn dust-proof O-ring, dried grease, or severe environmental dust, it is highly recommended to replace the O-ring, service the gripper, or replace the housing.
Stuttering During Closing: This is often triggered by dried-out grease, iron filings entering the mechanism, or slider wear. The recommended solution is to clean the unit, replace the slider, and re-lubricate.
Gripper Fingers Failing to Open: The air passage might be blocked by sealant. We advise clearing the air circuit and contacting after-sales support for factory repairs.
When a pneumatic gripper experiences air leaks or cross-bleeding (internal bypass leakage), check the seals or the 5-ring seal assembly for wear. If the seals are aging or the paper gasket seal fails, simply replace the seals/5-ring assembly or upgrade the gasket structure.
Sensor Issues
Rusted Sensor Target Block: This indicates an issue with the nickel-plating process. Contact after-sales support to optimize the plating process and replace the defective parts.
Sensor False Triggering: Check if the sensor mounting slot design has caused the sensing center to shift. Contact after-sales support to optimize the mounting structure and engineering drawings.
Sensor Constantly Staying Lit: This may be caused by an excessively hard aluminum clamping block putting continuous pressure on the sensor. Replacing it with a polyurethane block will resolve the issue.
Jammed Shock Absorber Protective Cap: This is typically caused by aluminum shavings entering the protective cap. Replace the shock absorber and improve the protective shielding on-site.
Shock Absorber Failure or Loss of Damping: This can happen if the shock absorber has reached the end of its lifespan or if the inner wall of the outer tube is scratched. Contact after-sales support to replace the shock absorber.
Spring Breakage: Check if the spring has suffered from fatigue damage; if so, simply replace the spring. If the pushrod stroke is too long—accelerating spring fatigue—add shims/spacers to shorten the stroke.
Pneumatic Gripper Housing Wear, Slider Wear, or Excessive Play: Caused by long-term housing wear; both the slider and housing need to be replaced.
Gripper Cylinder Housing and Slider Wear: This typically occurs in environments with heavy dust or cutting fluid when maintenance has been neglected over long periods. Clean and service the unit, replace worn parts, or send it back for repair. We highly recommend regular maintenance and adding robust dust protection.
Grease Bleeding / Leaking: This happens when the grease viscosity is too low or different greases are mixed. It is recommended to switch to Mobil grease and verify the performance.
Hard Limit Screw Breakage: This is due to insufficient durability of the original screws. We suggest replacing them with stainless steel screws and optimizing the design.
Air Port Blockage: Iron filings or oil sludge can clog the air passages. Clear the air circuit and replace the delta block.
Fractured Polyurethane Clamping Blocks: This points to an insufficient block lifespan. Simply replace the clamping blocks.
Self-Locking Failure: This points to an abnormal mechanism caused by a bent rack shaft. Replace the components and optimize the structural design.
Broken Center Gear Teeth: Gear damage usually results from a machine collision. Replace the gear and rack.
Positioning Accuracy Deviation: Often caused by shock absorber failure or limit structure deviation. Replace with spare parts and optimize the hard limit configuration.
