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1．钢球挡销折断 农具不能提升 一台泰山— 12型小四轮拖拉机在耕地作业中突然发生农具不能提升的故障。经过检查，得知液压油油量充足，油路畅通。试验中，机手发现柴油机在即将熄火的瞬间，农具有轻微的提升现象。拆下液压柱塞泵检查，发现该故障是由柱塞上的钢球挡销折?
1. Steel ball off the broken off tools can not upgrade a Taishan - 12 small four-wheel tractor in farm work suddenly can not upgrade the failure of agricultural tools. After examination, that adequate hydraulic oil, smooth flow of oil. In the test, the driver found that the diesel engine had a slight ascent at the moment when the diesel engine was about to turn off. Remove the hydraulic piston pump inspection and found that the fault is by the ball on the plunger stopper off?