Tasks Adjust, repair or replace parts and components of commercial transport truck systems Inspect motor in operation, road test motor vehicles and test automotive systems and components Adjust, repair or replace parts and components of automotive systems Adjust, repair or replace parts and components of truck-trailer systems Diagnose faults and malfunctions and confirm findings with supervisor to determine whether to repair or replace unit Repair or replace mechanical units or components Estimate parts and labour costs Perform scheduled maintenance service Review work orders and discuss work with supervisor