Checking the lateral clearance in the gearing of the final drive gears using A.95688 / R
1 – bracket tightening screw; 2 - indicator for checking the side clearance in the meshing of the driving and driven gears; 3 - screw for fastening the indicator rod; 4 – indicator bracket; 5 - fastening screw; 6 - driven gear
Scheme for checking the preload of differential box bearings
D is the distance between the two differential bearing caps; 1, 2 - adjusting nuts
Preload bearings of the differential box and
adjustment of the side clearance in the meshing of the main gear gears - these operations are performed simultaneously using the tool A.95688 / R and the key A.55085.
1. Attach the tool to the gearbox housing (see fig. Checking the preload of the bearings of the differential box with the tool A.95688 / R) screws 1 and 6, screwing them into the holes for the bolts of 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 gearing of the final drive gears using A.95688 / R) and install the 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 the screws 1 and 3.
3. By turning the adjusting nuts, pre-adjust the backlash between the teeth of the driving and driven gears within 0.08–0.13 mm. The gap is checked by indicator 2 while rocking gear 6. In this case, the bearings should not have a preload. The adjusting nuts must only be in contact with the bearings, otherwise the correct preload measurement will be impaired.
4. Tighten the two bearing adjusting nuts sequentially and evenly, this will cause the differential bearing caps to move apart and thus increase the distance «D» (see fig. Scheme for checking the preload of differential box bearings). This discrepancy is marked by indicator 9 (see fig. Checking the preload of the bearings of the differential box with the tool A.95688 / R), on the leg of which the lever acts 5. The nuts for adjusting the bearings of the differential box are tightened to increase the distance «D» (see fig. Scheme for checking the preload of differential box bearings) by 0.14–0.18 mm.
5. Having set the exact preload of the bearings of the differential box, finally check the backlash in the meshing of the final drive gears, which should not change.
6. If the gap in the meshing of the gears is more than 0.08–0.13 mm, then bring the driven gear closer to the leading one; move aside - if the gap 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 accurately perform this operation, watch the indicator 9 (see fig. Checking the preload of the bearings of the differential box with the tool A.95688 / R), which shows the previously set bearing preload. After tightening one of the nuts, the indicator reading changes, as the discrepancy increases «D» (see fig. Scheme for checking the preload of differential box bearings) caps and bearing preload. Therefore, loosen the other nut until the indicator arrow returns to its original position.
8. After moving the driven gear on the indicator 2 (see fig. Checking the lateral clearance in the gearing of the final drive gears using A.95688 / R) check the side clearance. If the clearance is not correct, repeat the adjustment.
9. Remove tool A.95688/R, install the locking plates of the adjusting nuts and secure them with bolts and spring washers. Spare parts are supplied with locking plates of two types: with one or two legs, plates are installed, depending on the position of the nut slot.
10. The adjustment and repair of the gearbox units is carried out on the 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.