山东装载机在使用过程中突然出现转斗工作无力和转到位后自动前倾的现象，但工作中动臂的上升和下降都正常。山东装载机专家分析可能是分配阀中的转斗滑阀和转斗双作用安全阀出现故障。如果转斗缸内的油封损坏，则在转斗作用下，使大腔内的油流入小腔(有杆腔)内，可能导致转斗自动前倾。分解两转斗缸后发现，其中一缸正常，另一缸的油封严重损坏。但更换油封后，转斗还是自动前倾。如果分配阀中的转斗前倾油路损坏，使转斗前倾油路中的油流入油箱，也会导致转斗自动前倾。检查山东装载机转斗滑阀知，滑阀处于正常状态。如果转斗双作用安全阀处常开状态，也能导致转斗自动前倾。因为转斗的大、小腔双作用安全阀是对转斗小腔起防止过载和补油作用的。
Shandong loader in use during sudden turn the work of fighting weakness and transferred to automatically forward position, but work in the boom of the rise and fall is normal. Shandong loader expert analysis may be assigned in the rotating bucket valve slide valve and the rotating bucket double acting safety valve failure. If the rotating bucket cylinder oil seal is damaged, in a rotating bucket effect, and a big cavity of the oil into the cavity (cavity of pole),may lead to the rotating bucket automatically forward. After the decomposition of the two rotary bucket cylinder, one of the normal cylinder, the oil seal of the other cylinder is seriously damaged. But replace the seal, the rotating bucket is automatically forward. If the distribution valve in turn bucket forward circuit damage, the rotating bucket forward oil in the oil into the tank, but also lead to transfer bucket automatically forward. Check Shandong loader bucket spool valve, slide valve in the normal state. If the bucket double acting safety valve normally open state, can also lead to the bucket automatically forward. Because of the large and small rotating bucket double acting safety valve is to prevent the overload and the rotating bucket cavity fill oil effect.

拆检山东装载机双作用安全阀后发现，锥阀前端有一黑色小橡胶块，经辨认，此黑色小橡胶块是转斗缸受损油封的残块。正常状态下，锥阀应是闭合的，现小橡胶块处于锥阀前端，将锥阀顶开使其处于?？刺斐勺犯仔对?、活塞杆收回并通过连杆机构导致转斗自动前倾。最后，将转斗双作用安全阀内的小橡胶块取出，转斗即不再自动前倾。
Inspection of the double effect of the safety valve Shandong loader, the end of the cone valve with a small black rubber block, identified, this small black rubber block is a rotating bucket cylinder damaged oil seal. Under normal conditions, the cone valve should be closed, the small rubber block in front end of the cone valve, the cone valve opening at the top so that it is in a normally open state, resulting in a rotating bucket cylinder unloading, piston rod back and through the connecting rod mechanism leads to the rotating bucket automatically forward. Finally, the rotating bucket small rubber block double acting safety valve removed, turning bucket is no longer automatically forward.