Xirmada daboolka dhamaadka, oo sidoo kale loo yaqaan daboolka dhamaadka ama daboolka boodhka saliidda, ayaa inta badan loo adeegsadaa sanduuqyada gearbox iyo kuwa yareeya si looga ilaaliyo boodhka iyo wasakhda inay soo galaan qaybaha dhaqaaqa.Inta badan waxaa loo isticmaalaa qalabka hawo-mareenada sida mishiinada injineernimada, mishiinada wax lagu durayo, mashiinada warshadaha, mashiinada hawo-qaadista, fargeeto, wiishashka, jebiyaasha biyaha, iwm. sanduuqyada gearbox, oo u adeegaya beddelka cidhifyada dhamaadka ama daboolyada dhamaadka, oo leh lakabka caagga ah ee dibadda taasoo ka dhigaysa mid u nugul daadinta saliidda kursiga saliidda.Isla mar ahaantaana, waxay xoojisaa muuqaalka guud iyo daacadnimada sanduuqa gearbox iyo qaybaha kale.Daboolka saliidda ayaa guud ahaan tixraacaya daboolida daboolka weelasha ku lug leh warbaahinta sida shidaalka, saliidda injiinka, saliidda saliidda, iyo wixii la mid ah qalabka farsamada.