Perkins 35943, User Handbook Manual, Page: 26 / 50

Chapter 4 35943
Page 20
How to check the drive belt
Press down the belt with the thumb at the centre of the longest free length and check the deflection (A). With
moderate thumb pressure - 45N (10 lbf) 4,5 kgf - the correct deflection 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 specific design. Use only a Perkins POWERPART drive belt. If
this is not done, an early failure of the belt may occur.
• Do not loosen the setscrew ( A1). If this setscrew is loosened, the thermostat housing to cylinder head seal
could be broken and result in a leakage of coolant.
1. Loosen the pivot fasteners (A3) of the alternator and loosen the setscrew (A2) of the adjustment link.
2. Change the position of the alternator to give the correct tension. Tighten the pivot fasteners of the
alternator and the setscrew of the adjustment link.
3. Check the belt tension again to ensure that it is still correct. If a new belt is fitted, the belt tension must be
checked again after the first 25 hours of operation.