Liphaephe tse nang le khatello e phahameng tsa mela e mengata li sebelisoa ho hokahanya liyuniti tse peli tsa lisebelisoa tsa hydraulic, hangata e le tsa liyuniti tse arolang: liyuniti tsa ts'ebetso le taolo tse sebelisoang ho laola likarolo tse haufi tsa likoahelo tse entsoeng ka mechini. Li lumella ho romela li-impulse tsa taolo hole pakeng tsa liyuniti tsa taolo le tsa ts'ebetso.