A professional who repairs automotive vehicle chassis assemblies installed on vehicles, such as crawler tractors, half-tracks, scout and reconnaissance cars, and tanks. Respnsibilities include:

• Removes chassis subassemblies, such as transmissions and crawler treads, using mechanic's handtools, jacks, and cranes.
• Disassembles units, such as crawler tread blocks and differential unit brake drums.
• Repairs and replaces worn and damaged parts.
• Fits parts together and reassembles parts to chassis, making necessary adjustments to ensure proper functioning.
• Installs parts or subassemblies for special tests as directed.
• Immerses parts in tanks of solvent or sprays parts with grease solvent to clean parts.