1 - pin,
2 - ball,
3 - secondary shaft,
4 - spacer sleeve,
5, 13 - needle bearing,
6, 9 - synchronizer ring,
7 - synchronizer clutch No. 1,
8 - synchronizer hub No. 1,
10 - retaining ring,
11 - spring,
12 - cracker,
14 - driven gear of the third gear,
15 - spacer sleeve,
16 - driven gear of the fourth gear,
17 - rear ball bearing,
18 - second gear gear,
19 - spacer sleeve.