PTO Driveshaft - BONDIOLI PAVESI - #201

Combination friction torque limiters and overrunning clutches FNV

FNV friction torque limiters have an adjustable torque setting. The torque setting of FNV friction clutches varies with different compression (h) of the Belleville spring. The compression of the Belleville springs used on FNV friction clutches must be adjusted to compensate for wear of the friction linings and to maintain the desired setting.

The tables below set out spring codes, thicknesses "t" and compression "h" measured as shown in the figure for standard settings. The height of the spring is measured next to each bolt and may be ± 0.2 mm of the listed value.

The tables also show the amount of rotation of each bolt required to achieve the next higher or lower setting, relative to the nominal setting (listed with no rotation noted on the

bolt).

In addition to the listed settings, intermediate settings may be obtained by tightening or loosening the bolts proportionately.

Do not over-tighten the bolts; this may endanger the function of friction clutches.

To avoid excessive wear to the implement, driveline, or tractor, Bondioli & Pavesi recommends that the defined setting not be altered.

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