Abstract: A trolley unit for a conveyor system comprises first and second releasably engageable trolley half sections. First and second shafts extend from one of said trolley sections and through the other trolley section to provide a pivot axis for an end of upstream and downstream trolley connecting cables. A third shaft provides a support bar for a load attachment hanger. Upon releasable attachment of the trolley halves an integral trolley unit with central housing houses the pivot shafts with the cables extending therefrom. The integral trolley unit is easily dismantled allowing for easy maintenance. A turn sheave includes a cable seat and plurality of trolley seats which inhibit inward deflection of the seated cables and trolleys when the trolleys are moving about a corner of the conveyor system as defined by a change in a horizontal direction of the support rail.