A door adjusting mechanism enables adjusting a position of a door moving in a track. The adjusting mechanism includes a truck member secured to the door and having moving structure engageable with the track. A connector connects the truck member to the door and includes cam structure for adjusting a position of the door relative to the truck member, thereby adjusting a position of the door relative to the track. In one arrangement, the truck member supports an adjuster bolt, and a connector includes an offset aperture that fits over the adjuster bolt. A nut is engageable with the adjuster bolt to secure the connector to the truck member. A position of the door in the track is adjusted by simply rotating the connector.