Truck Equipment Installation & Repair Flashcards

When mounting a PTO (Power Take-Off) to a transmission, what is the most critical measurement to verify before final installation?

Answer: Gear backlash between the PTO and transmission gears

Proper gear backlash prevents premature wear and noisy operation of the PTO drive.

A dump body hoist fails to lift fully under load but works fine empty. What is the most likely cause?

Answer: Low hydraulic fluid or a worn pump

Insufficient hydraulic pressure from low fluid or pump wear shows up only under load.

What is the primary purpose of a safety prop (body prop) on a dump truck?

Answer: To hold the raised body up while someone works beneath it

The body prop mechanically supports a raised dump body so hydraulic failure won't cause it to drop on a worker.

When installing a liftgate, why must the truck frame be reinforced at the mounting points?

Answer: To distribute the concentrated load and prevent frame cracking

Liftgates impose high cyclical loads that can crack an unreinforced frame.

Which hydraulic component regulates the maximum pressure in a truck body lift system?

Answer: Relief valve

A relief valve limits system pressure to protect hoses, cylinders, and the pump.

Before drilling into a truck frame rail to mount equipment, the technician should consult the chassis manufacturer's body builder guide primarily to avoid:

Answer: Weakening critical stress zones or hitting wiring/fuel lines

Body builder guides identify no-drill zones and routing of lines to prevent damage and frame weakening.

What does a 'snow plow' headgear receiver hitch installation require for proper electrical operation?

Answer: A correctly wired control harness and adequate vehicle charging capacity

Plow lights and hydraulics draw significant current, requiring proper harnessing and charging capacity.