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SDS/SDS plus钻头兼容约3/8",SDS max约3/4",都是Bosch发明的冲击锤钻。我有Bosch SDS plus(11224VSR,开关可选锤-锤击钻-钻), SDS max(11240,开关可选锤击或锤击钻)各一把,后者几年前偶尔没有hammer,今天加ground rod driver时发现完全没有hammer。Youtube找到一文:I have a Bosch 11241EVS and it would not hammer, after not much use for years. Sprayed starting fluid and WD-40 in the chuck several times, finally put it on hammer only and put the hammer bit on and kept tapping the bit on a block of cement as I pulled the trigger. I think the cylinder was stuck. works great now, this has happen at least 3 times to me over 15 years。就是说活塞卡住,要往卡头里加starting fluid和WD40,再加上锤头在混凝土块上试验复活,过去15年此故障至少发生过3次。
实际试验有效。开始用start fulid几次无效,后来加WD40还是无效,再加一次且搁置2小时后hammer正常。此前地线铜棍太靠近地基不行,这次错开2尺,ground rod先套卡子再加4吋1/2PVC用胶带缠住,否则ground rod drive内径太大。
一年后再次需要加WD40,关键是加油后搁置半小时然后在水泥地或大石头上试。看来是锤头活塞o-ring的问题,活塞运动使得空气压缩,到一定压力后释放锤头。
11240 manual: https://www.bosch-professional.com/gb/en/service/downloads/user-manuals/index.html parts:1617000A16,最主要的O-ring是162/163/165/104/837。diagram: https://www.mmtoolparts.com/11240-0611240039-part
装配:https://www.youtube.com/watch?v=_hTRxjgYbdg https://www.youtube.com/watch?v=qpMOtq_Tuao https://www.youtube.com/watch?v=ae8CpY9y54E https://www.youtube.com/watch?v=TW86zqknFgY 由于我只需要换piston和striker的O-ring,看这个更清楚些:https://www.youtube.com/watch?v=y62SZSX-IcU&t=4m55s https://www.youtube.com/watch?v=y62SZSX-IcU&t=13m13s,用50ml 10w40,但其中缺了striker换o-ring,但这个视频有:https://www.youtube.com/watch?v=FwtixqNqFds#t=33m
拆开:https://www.youtube.com/watch?v=4NA0m3YETDU#t=10m20s https://www.boschtoolservice.com/us/en/boschprof/spareparts/rotary-hammer-11240-0611240039 步骤:1)取下上端盖板,撬开前端胶帽。2)13m:取下内钢丝环143。不必压下套管,用spring ring plier张开环用尖锥勾住,将钢丝脱出其槽。然后取消套管,大弹簧28,弹簧垫30。3)23m40s:取下内簧卡154。Harbor的plier太小也吃不住劲。取下带双耳垫圈97,轴件可向外拔出。