E ikemiselitse ho hlahisa pinana ea mechine ea kaho, likarolo tse ka sehloohong tse sebelisoang ho epolloa ke pini e kopanyang pakeng tsa mokokotlo oa morao oa boom le sethala, pinana e kopanyang pakeng tsa sethala le silinda, pinana e kopanyang pakeng tsa pheletso e bohareng ea boom le cylinder, pinana e kopanyang pakeng tsa karolo e ka holimo ea tsebe le silinda, joalo-joalo, likarolo tsa kopo li bontšitsoe ka tlase.