Mower Fuel Gas Cap for John Deere AUC12860 GX23465 AUC18428 Cub Cadet Troy-Bilt MTD 951-12182 Toro Exmark 125-1847, Gas Cap for John Deere Cub Cadet Troy-Bilt MTD Toro Exmark Mowers & Tractors

What It Is

This is a replacement fuel cap designed to seal the gas tank on riding lawn mowers and garden tractors, primarily from John Deere, Cub Cadet, Troy-Bilt, MTD, Toro, and Exmark. It prevents fuel evaporation, spillage, and debris entry during operation.

Fitment & Compatibility

Cross-reference your OEM part numbers first: This cap replaces John Deere AUC12860, GX23465, AUC18428; MTD 951-12182; and Toro 125-1847. It also fits Cub Cadet and Troy-Bilt mowers that use those numbers.

Check your cap’s thread size and neck diameter – this cap uses a standard 2-inch threaded opening. Measure your tank neck’s outer diameter and thread pitch. Most compatible models use a 2-inch cap, but some Toro or Exmark tanks may use a different thread pattern.

Verify your mower’s model number – common fits include John Deere L100, L110, LA105, LA115; Cub Cadet LT1042, LT1050; Troy-Bilt Pony; MTD Yard Machines; Toro TimeCutter; and Exmark Lazer Z. But always confirm via your mower’s parts diagram or owner’s manual.

Aftermarket vs. OEM: This is an aftermarket cap. It’s not a genuine John Deere or Cub Cadet part, so fit may vary slightly on older or non-standard tanks. If your tank has a vented cap requirement, confirm this cap is vented (most replacement caps for these models are non-vented unless specified).

Key Things to Know

• Installation is trivial – just twist off the old cap and screw on the new one. No tools needed. Takes 10 seconds.
• Check for venting – some mowers require a vented cap to prevent vacuum lock. If your original cap had a small hole or vent valve, this aftermarket cap may be non-vented. A non-vented cap can cause fuel starvation or a hard start in hot weather.
• Common fitment issue – the cap may feel slightly looser or tighter than OEM. If it doesn’t seal fully, fuel can slosh out on slopes. Test by turning the mower upside down (or tilting) after installation.
• Material quality – made from plastic, not metal. It’s durable enough for normal use but may crack if over-tightened or exposed to extreme cold.

Should You Buy It

If you need a budget-friendly replacement for a lost, cracked, or worn fuel cap on a common John Deere, Cub Cadet, or MTD mower, this works fine. It’s best for older machines where OEM parts are pricey or hard to find. Skip it if you need a vented cap, a metal cap for heavy-duty use, or if your mower has an oddball tank thread. For $11.50, it’s a safe bet for most standard 2-inch threaded tanks.