Description Hill Billy Terrain motor (TMR01) Your Hill Billy Terrain may require a new motor if it is showing any of the following symptoms: Struggles to start. then starts suddenly particularly if you pull the trolley back towards you a bit. Lacking in power. particularly on hills – indicates possible motor problem only if your power source has been tested positively. ie battery and charger Trolley is dead. and it is virtually impossible to pull the wheels in the reverse direction