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有一台四方牌工农—3型小手扶拖拉机,工作100多小时后,柴油机起动困难,起动后柴油机齿轮室出现异常响声。经初步检查,发现供油时间过迟,调整供油时间后发动机虽能顺利起动,但齿轮室异常响声仍未消除。拆下齿轮室盖仔细检查,发现当油泵凸轮处在最低点(不供油位置)时,起动从动齿轮的齿顶紧紧顶住了推杆体下端,滚轮外圈与凸轮接触处出现了间隙(见图)。原因是油泵凸轮、滚轮内外圈、滚轮销等严重
There is a Sifang Agriculture and Industry-3 small walking tractor, more than 100 hours of work, the diesel engine starting difficulties, diesel engine gear chamber abnormal noise. After a preliminary inspection, found that the fuel supply time is too late, after adjusting the fuel supply time, although the engine can start smoothly, but the gear chamber abnormal noise has not been eliminated. Carefully removed the gear chamber cover and found that when the pump cam at the lowest point (not oil position), the driven gear tooth top firmly hold the lower end of the push rod body, roller outer ring and the cam at the contact occurred Clearance (see picture). The reason is the pump cam, wheel inner and outer rings, roller pin and other serious