Before scraping, you should carefully check whether smooth journal, whether there is rust, bumps and other defects, if any, should first try to eliminate; then, check the journal and shaft contact, method of examination in the shaft diameter, coated with a thin layer display agent (such as red lead powder, red Qian, oil, etc.), and then installed in the journal bearing by hand two or three revolutions, remove the shaft rotation to the forward and reverse directions, check the bearing on coloring distribution point, if the coloring distribution is not normal or simply turn no point, in order to begin scraping.
Scraping, depending on the circumstances, to take the principle of light after the first heavy scraping heavy to stay light, scraping large stay small. Start times, the hand can be heavier, more scrape some metal, in order to rapidly achieve better contact. When the contact area reaches 50%, it should scuffing. Scraped off every time, wipe the tile surface, and then repellent checking in the journal on the check, according to the conditions of exposure scraping, until you meet the technical requirements. Scraping examination can display agent, but require high precision bearing contact points, the scraping of the final stage can not display agent. Painted display agent bearing on coloring too large and difficult to determine the actual contact. At this point, the journal wipe placed directly on the bearing inner check, and then remove the shaft, bearing the highlights can be seen, is the point of contact. Scraping of the bright spot, until you meet the technical requirements.
Scraping, not only to make the point of contact to meet the technical requirements, but also the side of the gap and the contact angle to meet the technical requirements. General first research point of contact, and also take care of the contact angle, Last Zaigua side clearance. However, the contact portion and the non-contact portion should not have clear boundaries, and wipes the bearing surface with fingers, should be aware of no trace.
The open sump to rely on experience, but mainly to grasp the principles of:
1, the lubricant should be minimum oil film pressure at the input shaft;
2, tank open in the non-bearing area, otherwise it will reduce the carrying capacity of the oil film;
3 sump axial can not be opened, in order to avoid a huge loss of oil from the sump end;
Horizontal mounting bearing sump open half weeks, do not extend to the bearing area, full week the sump should open near the bearing at the end.
Addition, marched in the bush at the top hole, the sump around into the hole as the center, open width of the aperture equal sump, the shape can be taken to the "" shape, "×" glyphs "King"-shaped.


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