Truck Equipment Installation & Repair Flashcards

When mounting a toolbox or equipment to a fiberglass or aluminum service body, what fastening practice prevents long-term failure?

Answer: Using backing plates to spread the load and prevent material fatigue

Backing plates distribute load so thin panels don't crack or pull through.

A salt spreader's spinner motor runs slow. After confirming good voltage, the next check should be:

Answer: The motor brushes/connections and the controller output

With good supply voltage, worn brushes or a faulty controller commonly cause slow motor speed.

What is the main reason to install a hydraulic system relief/return filter on the return line?

Answer: To trap wear particles before fluid returns to the reservoir

Return-line filtration captures contaminants generated during operation, protecting components.

When installing equipment that changes the truck's center of gravity, the technician should:

Answer: Verify weight distribution and rollover stability per body builder specs

Raising or shifting the center of gravity affects stability and must follow chassis guidelines.

A liftgate operates slowly and the battery drains quickly. The most likely root cause is:

Answer: A weak charging system or undersized battery/cable for the gate's load

Liftgates draw heavy current, so an inadequate charging system or cabling causes slow operation and drain.

Why must hydraulic fittings be tightened to the correct torque rather than as tight as possible?

Answer: Overtightening can crack fittings or deform seats, causing leaks

Excess torque deforms sealing surfaces and can crack fittings, leading to leaks.

After completing a major equipment installation, what final step verifies safe operation before returning the truck to service?

Answer: A functional load test and inspection of all fasteners and connections

A load test confirms the installation works and holds up under real operating conditions.