This report culminates a two-year review of factors concerning the reliability of the Detroit Diesel Allison V730 automatic three-speed transmission for urban transit buses. This report is a continuing examination of the transmission's reliability. Made by the Detroit Diesel Allison Division of General Motors, the V730 is used in almost all urban transit coaches in the United States. This transmission displayed signs of poor reliability soon after its introduction to city transit service in late 1976. Its poor performance was attributable to a number of causes including service and maintenance, as well as design and general quality. This document is a follow-up to the report entitled: Reliability Evaluation of V730 Transmission, October 1982, NTIS number PB 83-167056, A03. The 1982 report covers transmissions manufactured between 1976 and 1981. This present report concentrates on newer transmissions which have been produced since that time and which incorporate a number of design improvements. The data was obtained from eight transit agencies representing the variety of environments across the United States. Methods of data analysis are essentially the same as in the first report, which includes distributions of mileage to first-time failure and mileages attained by unfailed transmissions. Comparisons are made between these newer transmissions and those of the earlier report. Conclusions include reliability improvements.

  • Corporate Authors:

    Transportation Systems Center

    55 Broadway, Kendall Square
    Cambridge, MA  United States  02142

    Urban Mass Transportation Administration

    400 7th Street, SW
    Washington, DC  United States  20590
  • Authors:
    • Seekell, F
  • Publication Date: 1983-11

Media Info

  • Pagination: 23 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00386304
  • Record Type: Publication
  • Report/Paper Numbers: UMTA-MA-06-0120-83-3Final Rpt., DOT-TSC-UMTA-83-42
  • Files: TRIS, USDOT
  • Created Date: Jul 30 1984 12:00AM