Nā ʻāpana excavator EX40-2 Track roller

ʻO ke ala HitachiwiliwiliʻO EX40-2 kahi mea kōkua ma lalo o ka kaʻa i hoʻopili kūikawā ʻia i ka mea hoʻoheheʻe hiʻohiʻona Hitachi EX40-2. ʻO kāna hana nui ke kākoʻo i ke kaumaha o ke kino o ka excavator, e hiki ai i ka excavator ke holo mālie i nā ʻano ʻāina like ʻole. Ka huila kino mea maʻamau 50Mn, 40Mn2, etc. Ma hope o forging, machining a me ka wela lapaʻau, ka paakiki o ka huila ili quenching pono e hiki HRC45 ~ 52 e hōʻoia i ka maikaʻi abrasion kū'ē a me ka haawe hiki.