油泵供油量不足或无油压

　　现象:

　　工作装置提升缓慢，

　　提升时发抖或不能提升；

　　油箱或油管内有气泡；

　　提升时

　　液压系统发出

　　“

　　唧、唧

　　”

　　声音；拖拉机刚启动时工作装置能提升，工作一段时间油温

　　升高后，则提升缓慢或不能提升；轻负荷时能提升，重负荷时不能提升。

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