ASE Truck Equipment Installation & Repair 2 — Questions and Answers
Question 1: When mounting a PTO (Power Take-Off) to a transmission, what is the most critical measurement to verify before final installation?
- Gear backlash between the PTO and transmission gears (Correct answer)
- The color of the gasket sealant
- Cab interior temperature
- Tire tread depth
Correct answer: Gear backlash between the PTO and transmission gears
Proper gear backlash prevents premature wear and noisy operation of the PTO drive.
Question 2: A dump body hoist fails to lift fully under load but works fine empty. What is the most likely cause?
- Low hydraulic fluid or a worn pump (Correct answer)
- A burned-out cab dome light
- Loose lug nuts
- A dirty windshield
Correct answer: Low hydraulic fluid or a worn pump
Insufficient hydraulic pressure from low fluid or pump wear shows up only under load.
Question 3: What is the primary purpose of a safety prop (body prop) on a dump truck?
- To hold the raised body up while someone works beneath it (Correct answer)
- To increase payload capacity
- To improve fuel economy
- To act as a spare tire holder
Correct 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.
Question 4: When installing a liftgate, why must the truck frame be reinforced at the mounting points?
- To distribute the concentrated load and prevent frame cracking (Correct answer)
- To make the truck heavier for traction
- To improve radio reception
- To reduce paint fading
Correct answer: To distribute the concentrated load and prevent frame cracking
Liftgates impose high cyclical loads that can crack an unreinforced frame.
Question 5: Which hydraulic component regulates the maximum pressure in a truck body lift system?
- Relief valve (Correct answer)
- Oil filler cap
- Drain plug
- Brake caliper
Correct answer: Relief valve
A relief valve limits system pressure to protect hoses, cylinders, and the pump.
Question 6: Before drilling into a truck frame rail to mount equipment, the technician should consult the chassis manufacturer's body builder guide primarily to avoid:
- Weakening critical stress zones or hitting wiring/fuel lines (Correct answer)
- Voiding the radio warranty
- Changing the paint code
- Resetting the odometer
Correct 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.
Question 7: What does a 'snow plow' headgear receiver hitch installation require for proper electrical operation?
- A correctly wired control harness and adequate vehicle charging capacity (Correct answer)
- Only a single ground wire to the bumper
- Removal of the alternator
- Disconnecting the battery permanently
Correct answer: A correctly wired control harness and adequate vehicle charging capacity
Plow lights and hydraulics draw significant current, requiring proper harnessing and charging capacity.
ASE Truck Equipment Installation & Repair 2
When mounting a PTO (Power Take-Off) to a transmission, what is the most critical measurement to verify before final installation?