Indlela yokulawula ingcindezi yangemuva yomshini wokubumba umjovo we-hydraulic iyadalulwa. Le ndlela ifinyelela ukulawulwa kwengcindezi yangemuva ngesikhathi sesigaba sokugcina impahla ngokufaka i-valve yokulawula isiqondiso sokuqala, i-valve yesibili yokulawula isiqondiso, inzwa yokucindezela, kanye ne-throttle valve phakathi kwe-cylinder yomjovo kanye ne-tank yamafutha. Lapho umshini wokubumba umjovo we-hydraulic ungena esigabeni sokugcina impahla.
Amachweba we-A kanye ne-T wevalvu yokuqala yokulawula isiqondiso ayavulwa, aqalise ukubuya kukawoyela. Amafutha asuka ngemuva kwesilinda somjovo agelezela ethangini likawoyela ngevalvu yokuqala yokulawula eqondisayo kanye ne-throttle valve. Ngesikhathi esifanayo, izimbobo ze-B kanye ne-P zevalvu yokulawula indlela yesibili ziyavulwa, okuvumela uwoyela osuka ethangini likawoyela ukuthi ugelezele ngemuva kwesilinda umjovo ngepompo likawoyela kanye nevalvu yesibili yokulawula eqondisayo. Ngalesi sikhathi, isilawuli se-PID siqoqa ngokuqhubekayo inani lokucindezela elitholwe inzwa yokucindezela futhi sinquma ukuzinza kwengcindezi yangemuva ngokusekelwe kunani lokucindezela eliqoqiwe. Lapho ingcindezi yangemuva ingazinzile, isilawuli se-PID silawula isivinini esiphumayo sephampu kawoyela yomshini wokubumba umjovo we-hydraulic ngokulawula injini ukuze izinze ingcindezi yangemuva. Inzuzo ukunemba kokulawula okuphezulu, okunika amandla-ukulawula ukucindezela emuva okunembayo okuphezulu.
