There are two ball bearings in each wheel motor

It is recommended to replace the seal when:

Ball bearings for electric motor with 4mm motor shaft that is installed on the smaller wheel motors

Switch for the stop button on G2 machines

On later models

Planetkugghjul plast liten motor 3st Reparationssats hjulmotor Husqvarna Automower och Gardena There are two ball bearingsPlanetary gears in plastic that sit closest to the electric motor. Fits: 310 315 315X105 305 308 220AC of later model yearsGardena R160 Sileno as well as many other Gardena. Suitable for example article number: 5849203 5871499 5850246 Check the appearance against the picture below, if the gearbox is golden and the attachment to the electric motor is black with 4 locking lugs, it fits. Characteristics: Beveled gears milled from high quality plastic in