Ngwa ihe ndị ahụ na-etipịa ihe mejupụtara ahụ bụ ngwa ngwa, cylinder hydraulic, aagba a na-ebugharị ebugharị na agba kwụ ọtọ.Ngwakọta ahụ mejupụtara ezé agba, agụba, na ezé nkịtị.A na-etinye ya na onye na-egwupụta ihe ma bụrụ nke mgbakwunye nke onye na-egwupụta ihe.
A na-eji ugbu a na-echipịa ihe n'ụlọ ọrụ mkpotu [1].N'oge usoro nbibi, a na-etinye ya na onye na-egwupụta ihe maka iji ya mee ihe, nke mere na ọ bụ naanị otu onye na-arụ ọrụ nke onye na-egwupụta ihe a chọrọ.