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Heavy Equipment Mechanic

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AVG. SALARY

$67,030

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EDUCATION

Post-secondary training +

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JOB OUTLOOK

Increasing

Real-Life Activities

Real-Life Math

You're responsible for maintaining a fleet of bulldozers, backhoes and heavy-duty trucks for an excavation and construction firm. As usual, you begin your day by running through a safety checklist for each piece of equipment.

Most check out. But there's one truck -- an 18-wheel dump trailer -- that has you concerned. The air pressure in the brakes isn't building up properly, which could pose a safety problem. The truck has a gross vehicle weight (how much the truck weighs with a maximum load) of 60,000 pounds.

You have the truck backed into the garage and go to work. The air pressure pump needs to be replaced. That's easy. You just have to figure out the piston size that will provide the right amount of air pressure.

On the shelf of your garage are 4 sizes of compressors: 9.5 inches, 14 inches, 18 inches and 19.5 inches. You consult the manual for the truck and find the following formulas apply:

Size of Air Compressor Piston = total air pressure in pounds x 0.6

Air Pressure = 1/2 pound of pressure per thousand pounds of gross vehicle weight (GVW)

So, which compressor will you install -- 9.5 inches, 14 inches, 18 inches or 19.5 inches?

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    ndcrn@nd.gov | (701) 328-9733

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