On motors with 4mm shaft you have to grind the motor a little to remove the laser welds that fix the bearings to the motor's outer casing

Instructions:

6X Planetkugghjul

These washers are also included in the front wheel rebuild kits I sell

Tätning axel för hjulmotor Honda Miimo HRM1000-HRM4000 Planetkugghjul i stål Dunkermotoren Husqvarna Automower 230ACX 330X On motors with 4mm shaftRadial seal for the wheel axle that fits most Honda Miimo. We have developed this seal with double sealing lips and a spring that provides a better seal than the original and increases the life of the wheel motor. We recommend that you to install the spring side facing away from the wheel and lubricate the seal with a little grease when installing. Fits: Honda Miimo HRM1000 HRM1500 HRM2500 HRM300 HRM310 HRM500 HRM520 HRM3000 HRM4000 Fits motors that