Steering wheel reasons for deviation and the reasons for such failures are generally excluded are: (1) within the steering gear valve spool piece suite positioning spring break, so that the sleeve does not automatically return to the neutral position, steering servo lose function. At this point, Tai'an biggest excavator schools must be replaced positioning spring sheet. (2) because of the oil hydraulic dirt slide valve movement is blocked. Spool valve should be cleaned, excavators school to move flexibly. (3) Since the offset spool valve and valve step position, the valve body is not in the neutral position. It should disassemble and repair the valve spool and replace it if necessary. Hydraulic oil appears whitish phenomenon reasons: ① over time replace the hydraulic oil; ② different grades of hydraulic oil mixed; ③ hydraulic oil with high water content; ④ sucked back into the oil filter is dirty school address Tai'an excavator | excavator Schools | Ka Excavators school by 泰安嘉 and Heavy Machinery Co.,泰安嘉 and Heavy Machinery Co., Ltd. (www.tajhzg.com/) strong, credible, in Tai'an, Shandong mining machinery industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Kerry and heavy and you hand in hand into the brilliant, for a better future!