Why Do Hydraulic Bollards Fail to Rise Completely?

Is a broken bollard putting your site security at risk? I understand the frustration when access control systems fail, but I can help you identify and fix these issues.

Hydraulic bollards often fail to rise because of low hydraulic fluid levels, air trapped in the system, or a faulty motor. Troubleshooting these specific components usually restores normal operation and secures your property again.

I see many clients panic when this happens. I know how to find the root cause. You can resolve most of these problems without needing a full system replacement.

Is your hydraulic system running low on fluid?

Are you worried about slow or incomplete bollard movement? I explain how the hydraulic fluid level directly impacts your system's performance and how to keep it working smoothly.

Low fluid levels cause incomplete raising because the pump cannot build enough pressure. I advise checking for leaks around hoses and fittings regularly to maintain the required fluid volume and consistent bollard pressure.

Hydraulic fluid is the lifeblood of your bollard. It transfers the force from the pump to the lifting cylinder. When the reservoir is low, air enters the line. This air is compressible, unlike the oil. When you try to raise the bollard, the air bubbles compress instead of pushing the cylinder. This is why the bollard stops midway or rises very slowly. I always tell my clients to check the reservoir levels first. You might see oil spots on the ground near the bollard. This indicates a leak in a hose or a fitting. You must fix the leak before refilling the fluid. If you just add fluid, you will lose it again. I recommend using the specific hydraulic oil recommended by MAKEROADGUARD. Do not use generic oils. They can damage the seals inside the pump. Keeping your fluid clean and at the right level prevents this failure entirely. You will also extend the lifespan of your hydraulic components significantly with this simple check.

Do you have air trapped inside the hydraulic lines?

Does your bollard jump or hesitate during movement? I explain why air bubbles are a common cause of incomplete lifting and how to effectively purge them from the lines.

Air trapped in your hydraulic lines prevents the system from building full pressure. You must bleed the air out through the designated valve to ensure a firm, complete lift every single time.

Air is the enemy of any hydraulic system. Even a small amount of air can disrupt the lifting process. This is especially true after you perform maintenance or replace a hose. When you reconnect components, air often gets trapped inside the lines. Because air is compressible, it acts like a spring. It absorbs the energy that should be lifting the heavy steel bollard. You will notice the bollard rising partly and then stopping, or shaking while it moves. To fix this, you need to bleed the system. I have done this many times. You open the bleed screw on the cylinder. Then you cycle the bollard up and down several times. This action pushes the air out of the valve. You must do this carefully. Wear safety glasses, as hydraulic oil can spray out under pressure. Once the movement becomes smooth and firm, you know the air is gone. This simple step restores your bollard to full operation. It ensures your security system is reliable and strong again.

Is there dirt or debris blocking the movement?

Does the bollard appear to hit an invisible barrier during operation? I discuss how physical obstructions inside the casing can stop your bollard from rising fully to its position.

Dirt, rocks, or small debris can accumulate in the base of the bollard casing. This material prevents the cylinder from extending fully. Regular cleaning of the bollard pit ensures unobstructed operation and movement.

The base of the bollard pit is a trap for debris. I roto i te waa, rain washes dirt, leaves, and small stones into the housing. If the bollard rises and lowers constantly, this material collects at the very bottom. Te mutunga iho, there is too much material. The cylinder cannot go low enough to start its cycle, or it hits the debris on its way up. I have seen this issue many times. It is a common cause of failure in older installations. The fix is cleaning the pit. You have to remove the bollard top if possible, or use a shop vacuum to clean the base. I recommend doing this at least twice a year. If you live in an area with a lot of wind or dust, you should do it more often. I also advise checking for bent parts. I etahi wa, a vehicle hits the bollard, slightly bending the outer sleeve. Even a tiny dent can prevent the cylinder from rising. A visual inspection is always the first step. You should keep the area clean to avoid these issues.

Whakamutunga

Incomplete rising bollards are usually caused by fluid leaks, trapped air, or debris accumulation, all of which are easily managed through regular maintenance and simple technical troubleshooting.