Replacing a Parking Barrier Spring Step by Step

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Replacing a parking barrier spring means isolating power, releasing the tension on the old spring, fitting a new spring matched to the arm's weight and travel, and then re-balancing the arm. The new spring must be sized to the barrier's length and counterweight, not just copied by eye. Always lock out the barrier before working on it.

Assess the Barrier Before You Start

Before touching the spring, look at the whole barrier. Check the arm for bends, cracks or loose fixings, and confirm that the motor, drive and limit switches are working. A spring that has failed is often a symptom of an arm that is heavier or more out of balance than it was designed to be.

Note the arm length and profile
Check for added weight such as signs or lights
Record the current spring type and position

Photograph the assembly from several angles so you can restore it exactly.

Isolate Power and Release the Tension

Switch off and lock out the power supply to the barrier before working near the spring or arm. Keep hands and tools clear of the arm's travel path. Secure the arm in a fixed position with a suitable support so it cannot drop when the spring is released.

Release the old spring's tension gradually and in a controlled way, following the mechanism's design. Never cut or remove a spring while it is still under load, as the stored energy can cause serious injury.

Measure and Specify the Replacement Spring

Measure the old spring's free length, wire diameter, coil diameter and end type. Compare these with the arm length and the counterweight. A spring that is too strong will make the arm snap upward, while one that is too weak will let it sag.

Write a short specification listing the length, wire gauge, number of coils, end style and the required force. For exact load values and installation tolerances, check with the engineer who designed the mechanism rather than relying on estimates.

Plan the Replacement and Confirm Parts

Order the new spring against your written specification and check that it matches the old part in every dimension that affects fit. Gather the tools you need, including the correct wrench sizes and a support for the arm, and plan the job so the barrier is out of service for as short a time as possible.

If the arm is heavy, the spring may have been upgraded or the balance changed previously. In that case, plan for a full re-balance rather than a like-for-like swap.

Install the New Spring

Fit the new spring into the same position as the old one, seating each end correctly in its bracket or anchor. Make sure the coils are not twisted and that the spring sits square and free of rubbing against adjacent parts.

Seat both ends fully in their anchors
Confirm the spring is not rubbing or pinched
Reconnect any linkages you disconnected

Tighten all fixings to the recommended torque, and recheck them after the first few cycles.

Re-balance, Test and Hand Over

Restore power and test the barrier slowly through its full cycle, both up and down. The arm should hold at any point in its travel without drifting, and it should not slam at either end. Adjust the spring tension or counterweight in small steps until the balance is correct.

Once the arm moves smoothly, run a few dozen cycles to confirm stability. Record the final settings, and tell the building manager or client what was changed so future service is easier.

Frequently asked questions

How do I know if my barrier spring needs replacing?

Common signs are an arm that drops or snaps upward, uneven movement, or a visible crack, gap or permanent stretch in the spring. A slow or noisy cycle can also point to a spring that has lost its tension.

Can I replace a spring with one of a different size?

Only if the new spring matches the arm's length, weight and counterweight. Using a spring with a different force will unbalance the barrier, so always specify the replacement from measured values.

Why does the arm need re-balancing after a new spring?

A new spring can have a slightly different force from the original, even if it looks identical. Re-balancing ensures the arm holds its position and moves smoothly through its full travel.

Is this job safe to do myself?

Springs under tension can cause serious injury, so the work should be done only by someone trained in barrier mechanisms. Lock out the power and get professional advice if you are unsure at any step.

Common mistakes to avoid

The most common error is fitting a spring by appearance alone without measuring the arm and counterweight. Releasing a spring under load without a proper support is also a serious hazard.

Our recommendation

Measure the old spring before ordering, photograph the assembly, and always re-balance and test the barrier through a full cycle before handing it back to the client.

Summary

Replacing a parking barrier spring is a controlled process of isolating power, releasing tension, fitting a correctly sized spring and re-balancing the arm. Careful measurement and testing keep the barrier safe and reliable.

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