... (a±e) Crownwheel tooth contact markings 23 3 There are three stages of friction clutch loading:1 Belleville spring action, 2 Bevel gear separating force action, 3 Vee slot wedging action.Belleville ... Differential lock mechanism with air control 23 6A roughness in the final drive transmission whenthe vehicle is cornering may indicate defectiveplanet/sun gears.7 .2 Differential locksA differential ... responseagainst varying tyre to road adhesion is shown inFig. 7. 12. 7 .3 .2 Torsen worm and wheel differentialDifferential construction (Figs 7. 13 and 7.14) TheTorsen differential has a pair of worm gears,...