A tire that still leaks after bead sealer needs the leak located before more sealant is added.
Why this matters
Small zero-turn caster tires can leak at the valve core, valve stem base, puncture, cracked sidewall, bent rim, or corroded bead seat. Bead sealer only addresses one of those paths.
Tools and materials
- Soapy water spray
- Valve-core tool and replacement core
- Tire gauge
- Jack and rated stands
- Tire irons or tire shop service
- Bead lubricant and rim-cleaning supplies
What I found and what remains
- Find the exact leak. Inflate to the tire rating and spray tread, sidewalls, valve, and both beads. Watch for growing bubbles.
- Check the valve first. Tighten or replace a leaking core; replace a cracked stem.
- Inspect the tire. Mark punctures, weather cracks, and bead damage.
- Remove the wheel safely. Chock the mower, use the manufacturer lift point, and support it with rated stands.
- Break the bead and inspect the rim. Clean rust, dirt, and old sealer without removing excessive metal.
- Decide repair versus replacement. A sound tire and rim may reseal; cracked rubber, damaged bead wire, or a bent rim requires replacement.
- Reinflate and retest. Use the specified pressure and repeat the soap test before returning the mower to service.
Common mistakes
- Adding more sealer without locating the leak
- Working under a mower supported only by a jack
- Overinflating to seat the bead
- Repairing sidewall cracks or damaged bead wire
Know your limits
A tire shop is the right choice when the bead will not seat safely, the rim is bent, or specialized restraint is needed during inflation.
Start with the diagnosis. Work safely, use the current product label or manufacturer instructions, and stop when the project moves beyond your tools, experience, or comfort level.