Belarus 80.1 Operation Manual page 147

- carry out adjustment of meshing of the main gear by installing the corresponding
number split adjusting shims 16 between flanges of drive gear cage 15 and FDA body 4.
Diametrical shims 16 should have the same thickness. Main gear backlash shall be in the
range from 0,18 to 0,46 mm. When measuring main gear backlash lock drive gear 6
against turning with a special tool, using threaded hole for filling and control plug 17 in
FDA body 4. There should be no axial play of drive gear 9. Replace worn out gears only in
pairs.
1 – left tube; 2, 7, 16 – adjusting shims; 3, 10, 11 – tapered roller bearings; 4 – FDA
body; 5 – differential housing; 6 – driven gear; 8 – right tube; 9 – drive gear; 12 – cardan
shaft flange; 13 – nut; 14 – adjusting washers; 15 – drive gear cage; 17 – control and fill-
ing plug.
Figure 3.10.6 – Adjustment of differential bearings and main gear meshing
3.10.2.3.2 Adjustment of the main gear drive gear bearings
Bearings 11 (figure 3.10.6) shall be adjusted so that there is no axial play in them,
preload not more than 0,05 mm in bearings 11 is allowed.
Adjust bearings in the following sequence:
- tighten bearings 11 with nut 13 against the stop. When tightening turn gear by
flange 12, so that rollers of bearings 11 are positioned correctly, the moment of resistance
to rotation of the gear should be in the range from 0.6 to 2 N•m;
- measure axial play of bearings. If there is axial play contact your dealer to remove
the paly by grinding one of the adjusting washers 14.
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80-0000010B OM