Umuyoboro wicyuma ni ubwoko bwibyuma bisobanutse neza nyuma yo gushushanya ubukonje cyangwa kuzunguruka.Bitewe nibyiza byo kutagira urwego rwa oxyde kurukuta rwimbere ninyuma rwumuyoboro wibyuma neza, nta gutemba munsi yumuvuduko mwinshi, neza cyane, kurangiza cyane, nta guhindagurika mugihe gikonje, nta kwaguka, gusibanganya no kutavunika, bikoreshwa cyane cyane kubyara ibice bya pneumatike cyangwa hydraulic, nka silindiri yo mu kirere cyangwa silinderi yamavuta, bishobora kuba umuyoboro udafite kashe cyangwa umuyoboro usudira.