Bachmann 4‑8‑4 Gear N Scale 19 Tooth Replacement

This bachmann 4-8-4 gear n scale 19 tooth replacement is designed to solve the well‑known issue of cracked or split gears in Bachmann’s N Scale 4‑8‑4 Northern locomotives. When the original gear fails, the locomotive may slip, click, hesitate, or stop moving even though the motor continues to spin. Installing this precision‑made replacement restores smooth, quiet, and reliable performance.

Two Options Available

Choose the version that best fits your repair:

Standard 19‑Tooth Gear — Matches the original Bachmann gear dimensions
Wide‑Shoulder 19‑Tooth Gear — A customer‑requested upgrade with a wider shoulder for improved lateral stability and smoother axle alignment

The wide‑shoulder version is not a Bachmann production change — it’s an enhanced option created based on customer feedback.

Features

Precision‑printed 19‑tooth gear for Bachmann N Scale 4‑8‑4
Standard and wide‑shoulder options
Durable material resists cracking and long‑term wear
Restores proper torque transfer and smooth running
Accurate tooth alignment for quiet operation

Symptoms of a Cracked Gear

A failing gear often causes:

Clicking or ticking noises
Motor spinning while wheels don’t move
Jerky or uneven movement
Hesitation under load

Replacing the gear resolves all of these issues.

Installation Notes

Bachmann tolerances vary slightly between production runs. A tiny amount of polishing or reaming may be needed for a perfect press fit. This is normal for N scale drivetrain repairs.

Shop All Products

Filters

Bachmann 4‑8‑4 Gear

Bachmann F9 N scale replacement gear large

Bachmann F9 N scale replacement gear small

Bachmann 2-8-2 Replacement Gear (N Scale)