6.4.8. Survey and control of technical condition of details of the back bridge

To take details of the sorted back bridge (except for bearings) in the washing solution, and then to wash out and to examine attentively.
To replace details with cracks. In the presence on mechanically processed surfaces of details забоин, agnails and other roughnesses to smooth out them for providing a good prileganiye of the interfaced details. At the same time it is necessary to pay special attention to a condition of landing surfaces under bearings.
To check whether is not present on rings of bearings of zadir or traces of uneven wear. To check a condition of end faces of rollers. Step wear of end faces of rollers testifies to an insufficient preliminary inhaling of bearings or to a distortion of rollers.
To examine teeths of the leader and conducted gear wheels and to check whether there are no zadir on them or traces of excessive wear. Worn-out gear wheels and gear wheels with teases for further work are unsuitable.
It is temporary to establish covers of bearings of differential and to check a vvertyvaniye of nuts. Nuts have to be turned freely. The end faces of nuts adjoining to bearings have to be perpendicular carving axes. The beating of these end faces concerning an axis of a carving has to be no more than 0,02 mm. The surface of end faces has to be pure and smooth, should not have step wear.
It is necessary to be convinced that covers of bearings are installed on that side on which they were processed.
The end face of a flange of the leading gear wheel adjoining to the bearing has to be smooth, in need of it it is necessary to grind. The second end face of a flange adjoining to a washer also has to be smooth, roughnesses and zaboina at end faces of a flange weaken an inhaling of bearings. The neck of a flange should not have забоин, scratches, big wear in a zone of work of a cuff, on a zakhodny facet should not be sharp edges.
The case of the bridge should not have damages and residual deformation. Surfaces of nests under bearings have to be smooth, the carving under nuts of bearings of differential should not have damages. It is necessary to remove all roughnesses and agnails from landing surfaces of a case of a reducer. To clean oil channels.
To examine teeths and basic surfaces of gear wheels of half shafts and satellites, basic and landing surfaces of boxes of satellites. They have to be smooth, without dents and zadir and not to have uneven wear or a navolakivaniye of metal. Wear of a neck of a semi-axial gear wheel can cause the increased noise of the back bridge. Wear of basic surfaces or basic washers causes increase in a side gap in gearing of gear wheels of differential and violation of the correct gearing of gear wheels.
To check density of a prileganiye of internal rings of bearings of differential to basic surfaces of boxes of satellites of differential — the probe of 0,03 mm should not pass between a ring and an end face of a box. Internal rings should not rotate freely on necks of boxes.
To pay special attention to that the adjoining surfaces of both boxes of satellites of differential and a surface of a flange of fastening of the conducted gear wheel were smooth, without agnails.

Fig. 5.39. Check of a beating of "nape" of the conducted gear wheel


It is necessary to check a beating of "nape" of the conducted gear wheel, as shown in fig. 5.39 — for the one-piece back bridge (for the back bridge with a beam like a banjo — similarly, at the removed reducer). An admissible beating — 0,08 mm. If when checking it turns out that the beating exceeds the specified size, then it is possible to assume that deformation of the conducted gear wheel, damage of boxes of differential or excessive wear of bearings takes place. Unsuitable details repair or replace.
The case of the bridge should not have considerable wear in a zone of work of a cuff of a nave, the surface under a cuff has to be smooth, without scratches and забоин.