How to Troubleshoot a Hydraulic Rising Bollard That Will Not Retract?

Stuck traffic at your entrance? I understand how a bollard that refuses to retract halts your operations. I provide actionable steps to identify and resolve this frustrating security issue.

A bollard that will not retract usually points to a faulty solenoid valve, an issue with the electrical control system, or an internal pressure release malfunction. I guide you through testing these core components to safely lower the bollard and restore your vehicle access control immediately.

You rely on your system every day. When it stops, you feel the pressure to fix it fast. I will show you exactly where to look so you regain control.

Is the Solenoid Valve Functioning Properly?

A faulty solenoid valve is the most frequent cause for a stuck bollard. I help you test this electrical component to see if it is preventing your system's descent.

The solenoid valve directs hydraulic fluid flow. If it does not activate, the oil cannot return to the reservoir. I suggest testing the coil's power and ensuring the valve is not physically stuck due to dirt or internal damage, preventing the bollard from lowering.

I often find that the solenoid valve is the culprit because it is an electrical part in a hydraulic system. It works as a gateway for the oil. When you send a command to retract, the control system sends electrical power to the solenoid coil. This power creates a magnetic field. The magnetic field pulls the valve plunger open. When the plunger opens, the oil flows back to the pump reservoir. If the valve fails, the oil is trapped in the cylinder. The bollard has nowhere to go. I suggest you start by checking if the coil gets power. You can use a simple multimeter to check for voltage at the solenoid plug. If there is power but the bollard does not move, the coil itself might be burnt out. If the coil is fine, the mechanical part of the valve might be stuck. Кээде, small debris from the hydraulic fluid blocks the valve from opening fully. I advise you to carefully remove the valve coil and check if you can manually press the plunger to release the pressure. Please do this only when the system is not under load.

Have You Checked the Control System Commands?

Are your sensors or remote controls ignoring the command to lower the bollard? I show you how to verify your control signal reaches the hydraulic system correctly.

Your control system might block the retraction command if safety sensors detect a vehicle or if the PLC controller has a logic error. I explain how to check these signals and bypass them safely to see if the bollard moves as expected.

The control system acts as the brain for your MAKEROADGUARD bollard. It does not just send signals; it also receives them from safety devices. The most common reason a bollard stays up is a safety sensor that thinks a vehicle is still present. I have seen many clients get stuck because a safety loop detector was dirty or broken. The detector thinks a car is sitting right over the bollard. Ошондуктан, the PLC (Programmable Logic Controller) will refuse to lower the bollard, even if you press the "retract" button. You should look at the control panel lights. Most PLC units have LED indicators for each sensor input. If the light for the safety sensor is on, the system is blocked. I recommend you clean the sensor area or check for faulty wiring. Another possibility is a simple communication error. Кээде, the remote control signal does not reach the PLC. You should check the remote receiver unit. Make sure the antenna is connected. If you have a physical button, test it. If the button works but the remote does not, the issue is with the remote receiver. I always encourage you to use a manual override if your system includes one, as this bypasses the electronic controls entirely.

Is There a Pressure Relief Issue?

Does the bollard feel stuck under immense pressure? I explain how to identify if the hydraulic pressure relief system is preventing the cylinder from descending as it should.

If the pressure relief valve is set incorrectly or jammed, the oil cannot bypass the pump, keeping the bollard locked in the up position. I show you how to safely inspect this valve to allow the necessary fluid movement for retraction.

The pressure relief valve is a safety feature for your hydraulic system. It ensures that the pressure does not get high enough to burst your hoses or damage the pump. Бирок, this valve must operate correctly to allow the bollard to lower as well. If the valve is set to a pressure that is too low, the bollard cannot lift properly. If it is stuck in the closed position, it can prevent the oil from returning, locking the cylinder in place. I treat this part of the system with extreme caution. It handles high pressure. I never attempt to adjust the pressure relief valve unless I am absolutely sure the solenoid valve is working correctly and the control system has sent the retraction command. You might need a professional to adjust this, as it requires specialized knowledge of the hydraulic schematic. If you suspect this is the problem, you can often use a manual emergency lowering screw or valve found on most MAKEROADGUARD systems. This allows the oil to bypass the hydraulic circuit completely. The bollard will lower slowly and safely under its own weight. This is a temporary solution to clear your entrance, but you must identify the root cause of the pressure issue afterwards to prevent future problems.

Корутунду

Troubleshoot stuck bollards by checking the solenoid valve, control system signals, and pressure relief settings to ensure safe, quick retraction and reliable daily vehicle access control.