ProSun Onyx 32 Gas Spring Replacement: Fix a Dropping Lid
By Spray & Sun | Published: 2026-11-01
Category: How-to Guides
Diagnose a sagging ProSun Onyx 32 canopy and replace the gas spring with the OEM-style part. Symptom checks, install steps, and when to stop.
Quick answer
If your ProSun Onyx 32 canopy sinks or won't stay up, the gas spring is the first part to check. Replace it with the ProSun Onyx 32 Tanning Bed Replacement Gas Spring, but stop and call a technician if the frame is bent, the mounting points are cracked, or the lid drops with a bang.
Why the Onyx 32 lid drops and what that means for the strut
A gas spring holds the canopy open by pushing against the lid's weight. Over time the internal seal can wear and the spring loses pressure, so the lid creeps down or needs a hand to stay up. That is a spring problem, not a frame problem.
Before ordering a replacement, rule out the cheap fixes: confirm the mounting bolts are tight and the pivot points are not binding. If the lid still sinks after that, the spring is the likely cause.
When to replace the spring and when to stop
Replace the spring when the lid drops slowly, won't hold its position, or feels heavy to lift. Stop and choose another option if the lid falls suddenly, the frame is bent, or the mounting brackets are cracked or stripped. Those are structural issues that a new spring won't fix.
If you are unsure whether the spring or the frame is at fault, have a technician inspect the bed before you buy parts.
Diagnose the lid problem before you replace the spring
- Symptom: lid sinks slowly or won't stay up: Lift the canopy to the open position and let go. If it drifts down within a few seconds, the gas spring has likely lost pressure. Check that the mounting bolts are tight first. A slow drop points to the spring; a sudden drop points to a structural problem.
- Symptom: lid falls fast or with a bang: Do not replace the spring yet. Inspect the frame, hinges, and mounting brackets for bends, cracks, or missing hardware. If any are damaged, stop and call a technician. Fast falls are a safety issue; a new spring won't fix a bent frame.
- Likely cause: worn gas spring: If the lid sinks slowly and the frame and mounts are intact, the spring is the likely cause. Order the ProSun Onyx 32 Tanning Bed Replacement Gas Spring and confirm you have the correct model before installation. Match the part to the Onyx 32; do not substitute a generic spring.
- Corrective action: replace the spring: Support the canopy securely, remove the old spring from its mounts, and install the new cylinder in the same orientation. Tighten the mounts and test the lid through several open-and-close cycles before use. Test the lid slowly the first time; if it still drops, stop and recheck the installation.
- When to stop and choose another option: If the lid still falls after a correct install, or if you see cracked mounts, bent frame tubes, or stripped bolts, stop. Those problems need a technician or a different repair, not another spring. Repeated spring failure is a sign of a deeper issue; get professional help.
Replacement part details
- ProSun Onyx 32 Tanning Bed Replacement Gas Spring: Commercial-grade OEM factory gas spring for ProSun Onyx 32 tanning beds; order includes one gas spring cylinder. A direct-fit part means you can restore canopy support without modifying the mount, and one cylinder covers a single-spring replacement.
ProSun Onyx 32 Tanning Bed Replacement Gas Spring
