Checking the lateral clearance in the engagement of the main transmission gears using the device A.95688/R
1 – bracket tightening screw; 2 – indicator for checking the lateral clearance in the engagement of the driving and driven gears; 3 – screw for fastening the indicator rod; 4 – indicator bracket; 5 – fastening screw; 6 – driven gear
Diagram for checking the preload of differential box bearings
D – distance between two differential bearing caps; 1, 2 – adjusting nuts
Preload of differential box bearings and
adjusting the lateral clearance in the engagement of the main transmission gears - these operations are performed simultaneously using the A.95688/R device and the A.55085 key.
1. Attach the device to the gearbox housing (see Fig. Checking the differential box bearing preload with the A.95688/R device) screws 1 and 6, screwing them into the holes for the bolts securing the locking plates of the adjusting nuts.
2. Move bracket 7 along the guide of the device until lever 5 touches the outer side surface of the cover and tighten screw 8. Loosen screws 1 and 3 (see fig. Checking the lateral clearance in the engagement of the main transmission gears using the device A.95688/R) and install bracket 4 so that the indicator leg 2 rests on the side surface of the driven gear tooth at the edge of the tooth, then tighten screws 1 and 3.
3. By turning the adjusting nuts, pre-adjust the lateral clearance between the teeth of the driving and driven gears within 0.08–0.13 mm. The clearance is checked using indicator 2 while rocking gear 6. In this case, the bearings should not have a pre-tension. The adjusting nuts should only be in contact with the bearings, otherwise, the correct measurement of the pre-tension is disrupted.
4. Tighten the two bearing adjusting nuts in sequence and evenly, this will cause the differential bearing caps to move apart and therefore increase the distance "D" (see Fig. Diagram for checking the preload of the differential box bearings). This discrepancy is marked by indicator 9 (see Fig. Checking the differential box bearing preload with the A.95688/R device), on the leg of which lever 5 acts. The nuts for adjusting the differential box bearings are tightened until the distance "D" increases (see Fig. Diagram for checking the preload of the differential box bearings) by 0.14–0.18 mm.
5. Having set the exact preload of the differential box bearings, finally check the lateral clearance in the engagement of the main gear gears, which should not change.
6. If the clearance in the gear engagement is more than 0.08–0.13 mm, then move the driven gear closer to the driving gear; move it back - if the clearance is smaller. To maintain the set bearing preload, move the driven gear by tightening one of the bearing adjusting nuts and loosening the other by the same angle.
7. To perform this operation accurately, watch the indicator 9 (see Fig. Checking the differential box bearing preload with the A.95688/R device), which shows the value of the previously set bearing preload. After tightening one of the nuts, the indicator reading changes, as the "D" divergence increases (see Fig. Diagram for checking the preload of the differential box bearings) caps and preload of bearings. Therefore, loosen the other nut until the indicator arrow returns to its original position.
8. After moving the driven gear along indicator 2 (see fig. Checking the lateral clearance in the engagement of the main transmission gears using the device A.95688/R) check the side clearance. If the clearance is not within the norm, repeat the adjustment.
9. Remove the A.95688/R device, install the adjusting nut locking plates and secure them with bolts and spring washers. Spare parts include two types of locking plates: with one or two tabs, install the plates depending on the position of the nut slot.
10. Adjustment and repair of gearbox units is performed on a stand, where you can also test the gearbox for noise and check the location and shape of the contact patch on the working surfaces of the teeth, as indicated in subsection 7.4.13.