Overview
Replace your trimmer’s worn gearbox with this aftermarket gear head to eliminate wobble and restore efficient power transfer to the cutting attachment. Manufactured to match factory tolerances, it drops right onto the drive shaft without modifications.
Key specifications
- Type: aftermarket replacement gear head
- Pre-greased: yes
- Material: die-cast aluminum housing with steel gears
Compatibility
This gear head fits Husqvarna 525RX 525LK 525LS 525L 525LX 525RJD 525RJX and similar models that share the same shaft interface. Always verify your trimmer’s model and part number against the full compatibility list to make sure the housing mount and drive splines align.
Installation notes
Remove the cutting attachment and unbolt the old gear head from the shaft tube. Inspect the drive shaft splines for damage before installing the new head. Slide the replacement onto the shaft, ensuring the splines engage fully, and secure the clamp bolts. Mount your preferred cutting attachment, start the trimmer at low RPM, and check for unusual vibration or noise.
Common questions
Q: Will this 537199201 gear head fit my Husqvarna 525LX, or is it only for the 525RX and bike-handle models?
Yes, this gear head is compatible with the Husqvarna 525LX as well as the 525RX, 525LK, 525LS, 525L, 525RJD, 525RJX, 525RK, 525RS, 525RXT, and 535LST. It is the replacement for part number 537199202, so the safest check is to match your original part number and model before installation.
Q: Does this gearbox head come ready to install on a Husqvarna 525RXT, and do I need to add grease before using it?
It should mount in place of the original gear head on a 525RXT, but you should always inspect the shaft connection, mounting hardware, and guard setup during installation. Before putting it into regular service, make sure the gearbox has the proper grease and continue greasing it at normal service intervals to reduce heat and gear wear.
Q: My 525LS trimmer head has started making a grinding noise near the bottom shaft housing—would replacing it with this 537199201 gear head fix that?
If the grinding is coming from the gearbox area, worn gears or bearings inside the head are a common cause, and replacing the gear head often resolves it. It is also a good idea to inspect the drive shaft and check for debris wrapped around the head, since those issues can cause similar symptoms even with a new gearbox installed.
