Perkins 415GM - How to Check the Drive Belt; How to Adjust the Belt Tension

N39453 Chapter 4
Page 51
How to check the drive belt
Press down the belt with the thumb at the centre of the longest free length and check the deection (J). With
moderate thumb pressure - 45N (10 lbf) 4,5 kgf - the correct deection of the belt is 10 mm (3/8 in).
How to adjust the belt tension
Cautions:
• The alternator is driven by a drive belt of a specic design. Use only a Perkins POWERPART drive belt. If
this is not done, an early failure of the belt may occur.
1. Loosen the adjusting strap pivot setscrew (J1) and the pivot fasteners (J2) of the alternator and loosen
the setscrew (J3) of the adjusting strap.
2. Change the position of the alternator to give the correct tension. Tighten the pivot fasteners of the
alternator, and the setscrews of the adjusting strap.
3. Check the belt tension again to ensure that it is still correct. If a new belt is tted, the belt tension must be
checked again after the rst 25 hours of operation.