Driver Circuit For Auxiliaries

Fig 1: Viewing Drive Belt Routing With And Without A/C Compressor

Courtesy of SAAB-SCANIA OF AMERICA, INC.

Drive belt routing, with and without A/C compressor 

1. Generator
2. Belt tensioner
3. Idler sprocket
4. Power steering pump
5. Water pump
6. A/C compressor
7. Crankshaft

The engine has only one belt drive for all the auxiliaries. The drive has an automatic, self-adjusting belt tensioner consisting of a powerful spring which maintains belt tension via a pulley.