1. Tsim los rau kab laug sab nqa / crane / neeg hlau
2. Crawler undercarriage tuaj yeem muab cov haujlwm xws li kev txhawb nqa, kev ruaj ntseg, traction, propulsion, yooj thiab yoog raws, tso cai rau kab laug sab mus ncig thiab ua haujlwm hauv ntau qhov chaw ua haujlwm nyuaj.
3. Qhov kev tsim chassis no yog txhawm rau txhim kho kev txav mus los, kev nyab xeeb thiab kev ua haujlwm ntawm cov cuab yeej siv tshuab thaum txo qhov cuam tshuam hauv av.