Pneumatic Systems · Routine Troubleshooting · Maintenance Reference
Applicable to Pneumatic Industrial Manipulators / Pneumatic Balancers / Vacuum Lifters / Pneumatic Tooling / Custom Material-Handling Equipment
| Project | Details |
|---|---|
| Document No. | AUREK-MNT-PNE-001 |
| Version | V1.0 |
| Scope | Air supply, filter-regulator, tubing fittings, pushbutton valves, directional valves, flow-control valves, cylinders, vacuum generators, suction cups, and pneumatic tooling |
| Applicable Stage | Pre-use inspection / Routine maintenance / Preliminary after-sales troubleshooting / On-site fault reporting |
| Intended Users | On-site operators, equipment maintenance personnel, sales and after-sales service personnel |
| Usage note: This document provides general troubleshooting guidance for pneumatic systems. Corrective actions may vary with load, tooling, control logic, and site air-supply conditions. For issues involving control-valve internals, cylinder seals, loss-of-air protection, or safety circuits, contact the manufacturer or qualified personnel. |
First: Pre-Use Safety Instructions
• If the equipment behaves abnormally, stop operation first and place the workpiece in a stable position or unload it. Do not continue testing while loaded.
• Before servicing or replacing pneumatic components or disconnecting air tubing, the main air supply MUST be shut off and residual pressure in the lines released.
• Before restoring the air supply, confirm that the tooling is in a safe position. Personnel must not stand within the travel envelope of the workpiece, tooling, or manipulator.
• Pneumatic valves, regulators, balance-pressure settings, and safety circuits are normally commissioned before shipment. Unqualified personnel must not change them without authorization.
• If the equipment raises or lowers on its own, the tooling will not release, a brake fails, or loss-of-air protection behaves abnormally, remove the equipment from service and contact the manufacturer.
Second: Pneumatic Troubleshooting Sequence
| Inspect from the outside inward, from simple causes to complex causes, and from the air supply to the actuators. Do not begin by dismantling valves or cylinders. |
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| Troubleshooting steps | Inspection Focus | Diagnostic Method / Recommended Action |
|---|---|---|
| 1. Check the Air Supply | Check that the main air supply is open, pressure meets equipment requirements, and the air compressor is not cycling excessively. | Check the pressure gauge; confirm that the main air supply pressure is stable; if it is lower than the equipment requirements, deal with the air supply first. |
| 2. Check the Filter-Regulator | Condensate in the filter bowl; blocked filter element; unstable regulator output; pressure misadjusted. | Drain water; observe the output pressure; clean or replace the filter element if necessary. |
| 3. Check Air Tubing and Fittings | The air tubing is bent, worn, cut, bulged, and the quick-connect connector is loose or leaking. | Listen for air leakage; detect leaks with soapy water; straighten the air tubing; replace damaged air tubing and joints. |
| 4. Check the control valve | Check operation of the pushbutton, directional, and flow-control valves; check for blocked valve ports or abnormal leakage at exhaust ports. | Press the button to see if there is air output; check the muffler and valve port; if abnormal, contact maintenance personnel. |
| 5. Check the cylinder/actuator | Check the cylinder for stick-slip, low force, internal leakage, or binding, and confirm that each tooling cylinder completes its full stroke. | Test unloaded operation; check the air supply to both cylinder ports; determine whether there is internal leakage or mechanical interference. |
| 6. Check the Tooling and Load | Check whether the workpiece is overweight, the tooling is eccentrically loaded, the suction cups or gripper jaws are worn, or the workpiece surface is abnormal. | Check the workpiece weight and dimensions; check the tooling contact surface; re-evaluate the tooling plan if necessary. |
Three. Common Compressed-Air Supply and Filter-Regulator Issues
| Symptom | Possible Causes | Inspection and Corrective Action |
|---|---|---|
| Equipment Motion Is Weak Overall | The total air supply pressure is low; the main pipeline air supply is insufficient; multiple devices use air at the same time, causing the pressure to drop. | Check the main air-supply gauge and the gauge at the equipment. Confirm that pressure is stable. If necessary, increase the supply-line diameter, add an air receiver, or adjust the air-use cycle. |
| Movement Speed Fluctuates | Air-supply pressure fluctuates; compressed air contains water; regulator output is unstable. | Observe the pressure gauge for fluctuation; drain condensate from the filter; check whether the regulator has been misadjusted or is blocked. |
| There is too much water in the filter | Insufficient compressor after-treatment; poor refrigerated-dryer performance; condensate not drained promptly. | Drain daily; add pre-filtration, cold dryer or automatic drainage device if necessary. |
| Regulator Output Is Unstable | The pressure regulating knob is loose; the internal diaphragm or seal is abnormal; the inlet pressure fluctuates too much. | Lock the knob; observe the inlet pressure; replace it or contact the manufacturer if it is still unstable after adjustment. |
| Equipment cannot rise | Air supply not open; pressure below the equipment's operating requirement; loaded-state switching not completed. | Open the air supply; confirm pressure at the equipment; check whether loaded/unloaded control switches correctly; confirm that the workpiece does not exceed the rated load. |
Section Four — Air Leakage from Hoses, Fittings, and Pneumatic Lines
| Symptom | Possible Causes | Inspection and Corrective Action |
|---|---|---|
| Air leakage at joints | Air tubing is not fully inserted; the tubing end is not cut square; the seal in a push-in fitting is worn; the threaded fitting is loose. | Remove the air tubing, cut the end square, and reinsert it fully. Tighten threaded fittings. If leakage persists, replace the fitting. |
| Damaged or Leaking Air Tubing | Air tubing is abraded by the workpiece, sharp edges, or moving parts; long-term aging; tubing has bulged. | Replace the air tubing with the same specification. Improve routing and add a protective sleeve or retaining clips, keeping the tubing clear of moving joints and sharp edges. |
| Movement slows down | Air tubing is kinked; the line is excessively long; the line diameter is too small; the silencer is blocked. | Straighten the lines; remove unnecessary tubing length; verify the line diameter; clean or replace the silencer. |
| Pipes fall off repeatedly | The line diameter does not match the fitting; the air tubing is under tension; the fitting's retaining collet is damaged. | Confirm the air-tubing specification; add retaining points and movement allowance; replace the push-in fitting. |
| Slow Leaks Are Difficult to Locate | A small leak is present at a valve-body connection, tee, push-in fitting, vacuum line, or suction-cup connection. | Apply soapy water at each suspected leak point; isolate pneumatic-circuit sections; observe pressure retention. |
Fifth: Control-Valve, Pushbutton-Valve, and Flow-Control-Valve Faults
| Symptom | Possible Causes | Inspection and Corrective Action |
|---|---|---|
| No response when pressing button | Control air does not reach the pushbutton valve; a small control tube is disconnected; the pushbutton valve is damaged or sticking. | Check the control-air supply; verify air at the pushbutton-valve outlet; inspect the small control tube and pilot port. |
| Valve Response Is Sluggish or Inconsistent | There is moisture, oil or dust in the valve; the valve core is stuck; the spring returns abnormally. | Improve air-supply filtration. With the air supply shut off, clean external connections. If the valve body has an internal fault, replace it or contact the manufacturer. |
| Continuous Leakage from the Exhaust Port | The reversing valve seal is damaged; internal leakage in the cylinder causes air leakage; the sealing ring is contaminated or the assembly is abnormal. | First determine whether leakage originates in the valve or cylinder. Check for internal leakage between cylinder chambers. Replace the valve or cylinder seals as necessary. |
| Movement Speed Is Too High | Throttle valve opening is too large; load changes; buffer adjustment is improper. | Gradually close the flow-control valve; confirm the load range; avoid making a large adjustment in one step. |
| Movement speed is too slow | The throttle valve opening is too small; the muffler is blocked; the air supply is insufficient; the valve port is blocked. | Increase the throttle valve appropriately; clean the muffler; check the air supply pressure and pipeline smoothness. |
| Abnormal Loaded/Unloaded Switching | Control valve does not shift; pilot signal is insufficient; pressure is incorrectly adjusted. | Check the Load button, unloaded-balance pressure, and loaded-balance pressure. Do not activate the loaded state when no workpiece is gripped. |
Section Six — Cylinder and Actuator Faults
| Symptom | Possible Causes | Inspection and Corrective Action |
|---|---|---|
| Cylinder Does Not Move | No air supply; the directional valve does not shift; air tubing is connected incorrectly or blocked; the mechanical structure is binding. | Confirm the air supply to both cylinder ports; check directional-valve output; check the tooling or linkage for mechanical interference. |
| Cylinder Force Is Low | Insufficient air supply pressure; excessive load; internal leakage in the cylinder; mismatched cylinder specifications. | Verify pressure and load; check for internal leakage. If low force persists, contact the manufacturer for assessment. |
| Cylinder Exhibits Stick-Slip or Rough Motion | The air supply contains water/contamination; the seal is worn; the guide resistance is large; the load is eccentric; the speed is improperly adjusted. | Improve filtration; check guides and connections; adjust load center; replace seals if necessary. |
| Air leakage at both ends of the cylinder | Piston or end-cap seals are worn; the cylinder bore or rod is scored; prolonged exposure to dust has caused wear. | Locate the leak; replace seals or the cylinder; improve dust protection and air preparation. |
| Tooling Cylinder Does Not Complete Its Stroke | Restricted stroke; changed workpiece dimensions; shifted gripper-jaw position; insufficient air pressure. | Check workpiece dimensions and gripper-jaw positions; verify the travel switch or end stop; unload the workpiece before adjusting the tooling. |
Seventh: Common Vacuum-Gripping Issues
| Symptom | Possible Causes | Inspection and Corrective Action |
|---|---|---|
| Vacuum Tooling Does Not Grip | Insufficient vacuum pressure; suction cup is aging; workpiece has a rough surface, oil, and holes; the vacuum tube is leaking. | Check the vacuum meter; clean the workpiece surface; replace the suction cup; check the vacuum tube, joints and suction cup interface. |
| Workpiece Drops After Pickup | Too few suction cups; insufficient effective holding area; workpiece deformation; handling motion is too fast; inadequate vacuum retention. | Reduce handling speed; check suction cup layout; increase suction cup quantity or replace suction cup form; evaluate anti-drop protection. |
| Vacuum builds up slowly | The vacuum pipeline is too long; the pipe diameter is too small; the filter is clogged; the air supply to the vacuum generator is insufficient. | Shorten the pipeline; check the air supply pressure; clean the vacuum filter; check the vacuum generator. |
| Vacuum Releases Slowly | Vacuum-break valve fault; restricted exhaust path; suction cups adhere too tightly to the workpiece. | Check the vacuum breaking valve; clean the exhaust port; adjust the suction cup layout and contact pressure. |
| Rapid Suction-Cup Wear | Sharp workpiece edge; rough surface; unsuitable suction-cup material; dragging during operation. | Replace with more suitable material suction cup; avoid dragging; increase guide positioning to reduce eccentric wear. |
Eighth: Tooling, Brakes, and Safety Pneumatics
| Symptom | Possible Causes | Inspection and Corrective Action |
|---|---|---|
| Gripper Does Not tooling Securely | Insufficient gripping pressure; worn gripper pads; changed workpiece dimensions; incorrect tooling position. | Check gripping pressure; replace gripper pads; verify workpiece dimensions; correct the position, then test-grip again. |
| Tooling Will Not Release | Release valve does not operate; cylinder binds; workpiece is mechanically wedged; mechanical interference. | First stabilize the workpiece. Check the Release button and control valve; verify cylinder operation; inspect the tooling for deformation. |
| Joint brake does not work | The brake pneumatic circuit is out of air; the button valve is faulty; the air tubing is bent; the brake mechanism is stuck. | Check the brake control air pressure; check the button valve output; straighten the air tubing; contact the manufacturer if necessary. |
| Equipment Raises or Lowers on Its Own | Incorrect unloaded/loaded balance-pressure adjustment; air-supply pressure fluctuations; internal cylinder leakage; abnormal balance circuit. | Remove the equipment from service immediately; stabilize the workpiece; do not continue loaded testing; have qualified personnel recommission the system. |
| Abnormal Motion After Loss of Air | Loss-of-air protection has failed; the air-reserve circuit is abnormal; the check valve or safety valve has failed. | Remove the equipment from service and contact the manufacturer to inspect the safety circuit. Unqualified site personnel should not make adjustments themselves. |
Nine. Quick Leak Detection and Diagnostic Methods
| method | Applicable location | Operational points |
|---|---|---|
| Audible Leak Check | Damaged fittings, valves, silencers, and air tubing with obvious leakage | After the equipment supplies air, approach the suspected location and listen for a "hissing" sound; be sure to keep a safe distance. |
| Soapy water leak detection | Push-in connectors, threaded connectors, valve body interfaces, vacuum pipelines, suction cup interfaces. | After applying the solution, observe whether bubbles continue to form. Wipe the area dry after inspection to avoid contaminating components. |
| Pressure-Hold Test | The complete pneumatic circuit, tooling holding circuit, and vacuum holding circuit | After isolating downstream functions, observe the rate of pressure drop to determine whether a slow leak is present. |
| Isolation-by-Section Test | Multi-branch pneumatic circuits, tooling pneumatic circuits, and vacuum systems | Close or disconnect sections step by step to reduce the scope of air leakage and avoid blind replacement of components. |
| Substitution Test | Suspicious components such as button valves, reversing valves, pressure regulating valves, and throttle valves. | Replacement testing is performed on the premise that the specifications are consistent and safe; critical safety components must be operated by professionals. |
Section Ten — Routine Maintenance Recommendations
| maintenance items | Recommended Interval | Maintenance Item |
|---|---|---|
| Air-Supply Pressure Check | daily | Check the main air supply and equipment end pressure gauges to confirm that the pressure is stable and meets equipment requirements. |
| filter drain | Daily or according to on-site conditions | Drain the accumulated water from the filter cup to prevent moisture from entering the valve, cylinder and vacuum generator. |
| Air-Tubing Inspection | Weekly | Check for wear, bending, bulging, aging, and friction with moving parts. |
| Joint inspection | Weekly | Check for looseness, leakage, or disconnection; reseat or replace the component as necessary. |
| Control valve inspection | Monthly | Check for responsive operation, abnormal exhaust-port leakage, and proper pushbutton return. |
| Cylinder inspection | Monthly | Check for smooth motion, stick-slip, leakage, binding, or abnormal noise. |
| Vacuum system inspection | Weekly | Check suction cup, vacuum tube, filter, vacuum gauge and vacuum breaker valve. |
| tooling connection check | Weekly | Check that bolts, pins, gripper pads, anti-drop features, and locating components are secure and reliable. |
Section Eleven — Troubleshooting Limits and When to Contact the Manufacturer
Checks the Customer May Perform
• Check whether the air supply is open and pressure is noticeably low.
• Check the filter-regulator for accumulated condensate and confirm that pressure has not been misadjusted.
• Check whether air tubing is kinked, fittings are disconnected, or suction cups show obvious aging.
• Check whether workpiece weight, dimensions, and surface condition match the original design conditions.
• Check whether new obstructions, tooling, utilities, or structures interfere with manipulator motion.
Contact the Manufacturer or a Qualified Technician When
• The equipment rises or falls on its own and cannot stabilize its balance.
• The control valve continues to leak, the cylinder is suspected of internal leakage, or the safety circuit is abnormal.
• The tooling will not release, a brake fails, or loss-of-air protection behaves abnormally.
• The equipment has sustained a collision, the structure is deformed, or a weld or load-bearing connection is abnormal.
• Balance pressure, loaded-balance pressure, load-switching logic, or tooling safety interlocks require readjustment.
Twelfth: On-Site Fault Feedback Record
| record items | Fill in the content | Remarks |
|---|---|---|
| Equipment number/project name | ||
| Date/Time of Fault | ||
| Fault location | □ compressed-air supply □ Pipeline □ Control valve □ Cylinder □ Vacuum system □ Fixture □ Others | |
| Symptom Description | ||
| Was the unit carrying a load? | □ Yes □ No; workpiece weight: ________ kg | |
| Equipment end air pressure | ________ MPa | |
| Is there any air leakage sound? | □ Yes □ No; Location: | |
| Actions Already Attempted | ||
| On-site photos/videos | □ Provided □ Not provided | It is recommended to provide equipment panorama, fault location, pressure gauge, pipeline and tooling action video |
| Corrective Action / Preliminary Assessment | ||
| Is on-site service required? | □ Yes □ No □ To be confirmed | |
| Spare parts requirements | □ None □ air line □ Connector □ Valve □ Cylinder □ Suction cup □ Others: | |
| Manufacturer Response / Recommended Corrective Action | ||
| Maintenance Person/Date | ||
| Customer confirmation | ||
| Contact/Phone |
| Resource Center card copy: This guide covers routine maintenance and troubleshooting of pneumatic systems for Pneumatic Industrial Manipulators, Pneumatic Balancers, Vacuum Lifters, and custom pneumatic tooling. It addresses common issues including insufficient air-supply pressure, air-tubing leaks, loose fittings, control-valve leakage, abnormal cylinder motion, inadequate vacuum grip, and tooling that will not release. |
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