An undercarriage for a working machine having a chassis. The chassis includes a first axle mount and a first axle assembly mounted to the first axle mount. The first axle assembly has a first axle with first and second ends for pivotably mounting first and second wheels. The first axle mount is provided in the form of first and second arms extending from the chassis to define a channel therebetween, and the undercarriage is configured to restrict movement of the first and second arms.