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（１）一台东方红－７０型推土机在清渠作业中，突然推土铲不能提升只能压降。检查分配器未发现异常。怀疑可能是油缸有问题，卸下油缸检查，发现右侧油缸杆从油缸中脱出，原来是油缸内紧固活塞的螺母从油缸杆上松脱，使活塞从油缸杆上脱落而造成上述故障。装复活塞及紧固螺母
(1) a Dongfanghong-70 bulldozer in the quarry operations, suddenly can not raise the blade can only enhance pressure drop. Check that the dispenser has found no abnormalities. Suspected that the cylinder may be a problem, remove the cylinder inspection and found that the right side of the cylinder rod prolapse from the cylinder, the original is the cylinder fastening the piston nut loose from the cylinder rod, the piston rod from the cylinder caused the failure. Install the piston and the fastening nut