Mapiritsi ophwanyidwa amapangidwa ndi pliers thupi, silinda ya hydraulic, nsagwada yosuntha ndi nsagwada zokhazikika.Thupi la pliers limapangidwa ndi mano a nsagwada, masamba, ndi mano wamba.Imayikidwa pa excavator ndipo ndi ya chomangira cha excavator.
Zomangira zophwanyira tsopano zimagwiritsidwa ntchito kwambiri pakugwetsa [1].Panthawi yowononga, imayikidwa pa chofufutira kuti chigwiritsidwe ntchito, kotero kuti woyendetsa m'modzi yekha wa excavator amafunika.