Dr4 - 5 hydraulic valavu yamile yamagetsi yamagetsi. Kutulutsa kwampu yamafuta kumadyetsa valavu kumakhala ndi ntchito yothandizirana ndi kupanikizika ndipo imatha kusintha mayendedwe okha. Kupanikizika kumatha kusinthidwa kuchokera ku 0 mpaka 20mm, ndipo ndikosavuta kusintha, kapangidwe kake ndi kosavuta, ndipo kusinthaku ndikosavuta.