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ＺＬ５０（４０）型铰接式装载机后车架主要有三组孔系：连接前后车架的铰接孔；连接转向缸的后支座孔（转向孔）；连接副车架的支承架孔（支承孔）。如图１所示，三孔系间的精度要求是，转向孔组对铰接孔组的平行度０．１ｍｍ，铰接孔组对支承孔组的垂直度 ０．６ ｍｍ；孔组
The rear frame of the ZL50 (40) articulated loader mainly has three groups of holes: a hinge hole for connecting the front and rear frames, a rear seat hole (steering hole) for connecting the steering cylinder, a support hole for connecting the subframe ). As shown in Fig. 1, the accuracy requirements of the three-hole system are that the parallelism of the steering hole group to the hinge hole group is 0.1 mm and the perpendicularity of the hinge hole group to the support hole group is 0.6 mm;