10 Tooth Trimmer Gear Head And Gearbox For Husqvarna 525 Series RXT LX RS RK RJX RJD LST OEM Replacement 537199201 537199202 503941201 503941101 537041001 Drop In Fit For Square Or 10 Spline Shafts Heavy Duty Upgrade For Quick Field Fix

Sealed 10-Tooth Trimmer Gear Head & Gearbox for 525 Series
✔️ Fits square or 10-spline shafts, heavy duty upgrade option, single

This is a heavy-duty trimmer gear head and gearbox replacement for 525-series brushcutters and compatible models. It supports square and 10-spline shafts, making field repairs quick and straightforward.

✅ OEM replacement part numbers: 537199202, 537199201, 503941201, 503941101, 537041001, 537333802, 536503801
✅ Compatible with 525L, 525LK, 525LS, 525LX, 525RJD, 525RJX, 525RK, 525RS, 525RX, 525RXT, 535LK, 535LST
✅ Square and 10-spline shaft compatibility for quick field fixes
✅ Drop-in fit ensures easy installation without modification

💡 What is a trimmer gear head and gearbox used for in outdoor power equipment?

A gear head and gearbox transfer engine torque to the cutting head, improving drive efficiency and protecting the drive system in rough trimming jobs. This handy component replaces worn parts and keeps equipment running smoothly.

- torque transfer and drive efficiency for string trimmers - quick field replacement keeps downtime to a minimum - fits square or 10-spline shafts for a wide range of models✝️