Although not limited to, these clutch requirements are normally used on trucks considered as Heavy Duty (Class 8). This SAE Information Report defines and discusses clutch and related component configurations which will become the subject of future SAE Recommended Practices to promote standardization of clutch installations and mounting dimensions for use with pull-type heavy-duty clutches.
This document is being submitted for cancellation. When originally written in 1997, the Heavy-Duty Clutch Committee and the Heavy-Duty Transmission Committee met and jointly anticipated the future need for a class of low-speed, high power engines (e.g., 450kW, 600Hp at speeds below 1100 RPM). Such engines could require higher torque clutch capabilities; on the order of 4300 Nm (3100 Lb-ft). The anticipated class of engines has not materialized in the years following the release of this document nor has the development of the anticipated higher-torque clutches occurred. As a result, it is still not possible to resolve the “unknown” technical requirements cited in 4.2 of this document and it does not appear that any useful resolution is likely in the foreseeable future.