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我单位大修的一台日产 NK300B型全液压起重机,出厂前在测试臂杆伸缩性能时,出现了意想不到的情况:第4节臂杆伸缩软管(长 19．8 m,大修中已换为双层钢丝编织液压橡胶管,以下简称软管)总是脱槽,要么乱绕在卷筒上,要么掉到卷筒外,使起重
A Nissan NK300B full hydraulic crane overhauled in my unit unexpectedly appeared when testing the boom expansion performance at the factory: Section 4 boom telescopic hose (19.8 m long, overhaul replaced Double-layer steel wire braided hydraulic rubber hose, hereinafter referred to as hose) is always off the groove, either around the reel or reel, so that the lifting