Mitundu ya ma jacks ndi chipangizo chonyamulira chomwe chimagwiritsa ntchito hydraulic pump kapena mpweya mpope ngati chipangizo chogwirira ntchito chonyamulira zinthu zolemetsa mkati mwa sitiroko kudzera pabulaketi yapamwamba.
Jack amagwiritsidwa ntchito kwambiri garaja, mafakitale, migodi, mayendedwe ndi madipatimenti ena monga kukonza magalimoto ndi zokweza zina, thandizo ndi ntchito zina.
Malo ogwirira ntchito zamagalimoto ndi njinga zamoto nthawi zambiri amafunikira kugwiritsa ntchito zida zonyamulira, ndipo chimodzi mwazinthu zofunika kwambiri zonyamulira zomwe zimagwiritsidwa ntchito pagulu la magalimoto ndi njinga zamoto ndi jack. Jack wamtunduwu ndi wosunthika kwambiri, uli ndi zabwino zambiri, monga mawonekedwe osavuta, kulemera kwake, kosavuta kunyamula, kuyenda kosavuta. Ndipo sizingathandize kokha kukweza magalimoto, komanso kuthandizira kukankhira magalimoto mozungulira.