With or without accommodation, the "X" indicates the overall strength demand of the position during a typical workday: Sedentary - lifting of no more than 10 pounds Light - lifting no more than 20 pounds; carrying up to 10 pounds Medium - lifting no more than 50 pounds; carrying up to 25 pounds Heavy - lifting no more than 100 pounds; carrying up to 50 pounds X Very Heavy - team lifting over 100 pounds; carrying more than 50 pounds Physical Demand Codes: The following describes whether or not the position is expected to exert the physical demands listed during a typical workday as well as the overall frequency of the task: Codes for how often: N = No E = Extensive (100 - 70% of the time) M = Moderate (60 - 30% of the time) I = Infrequent (20 - 10% of the time) A = Almost Never (. Overhaul and/or repair components such as clutches, brakes, transmissions, transfer cases, differentials, universal joints, air conditioning, motor ignitions, carburetors, and electrical and hydraulic systems vehicles such as trucks, trailers, street sweepers, tractors, skid loaders, backhoes, and other equipment as needed.