ASE Practice Test (E1: Truck Equipment Installation & Repair)

Question 1

When installing an upfitter-supplied work body on a cab-chassis, the FIRST step before drilling any holes in the frame is to:

Accepted Answer

Consult the chassis manufacturer's body builder guidelines for drilling restrictions

Answer

Apply undercoating to the frame rails for corrosion protection

Answer

Weld mounting brackets to the frame for maximum strength

Answer

Install the body and measure for proper cab-to-body clearance

Question 2

A hydraulic liftgate is cycling slowly in both raise and lower directions. The MOST likely cause is:

Accepted Answer

Contaminated or low hydraulic fluid

Answer

A faulty solenoid valve in the raise circuit

Answer

A worn pump that only affects the raise direction

Answer

Incorrect wiring polarity to the hydraulic motor

Question 3

When splicing into a chassis OEM wiring harness to power upfitted equipment, the correct method is:

Accepted Answer

Use a dedicated relay, circuit breaker, and properly rated wiring from the battery or PDC

Answer

Tap into any available circuit near the equipment location

Answer

Splice directly into an existing circuit using quick-tap connectors

Answer

Run all upfit equipment wiring through the OEM fuse block

Question 4

A utility body's rear compartment doors will not stay latched. The MOST efficient correction is:

Accepted Answer

Adjust the striker plate position to achieve proper latch engagement

Answer

Replace the complete latch and striker assembly on both doors

Answer

Weld a reinforcement plate behind the latch mounting area

Answer

Apply lubricant to the latch mechanism and test again

Question 5

A PTO (power take-off) driven hydraulic system is making a grinding noise during operation. The MOST likely cause is:

Accepted Answer

Low hydraulic fluid level causing cavitation at the pump

Answer

Incorrect PTO gear ratio for the pump speed

Answer

A collapsed hydraulic return line restricting flow

Answer

Excessive hydraulic pressure above relief valve setting

Question 6

After installing a flatbed body on a cab-chassis, the completed unit must be weighed because:

Accepted Answer

GVWR, front/rear axle ratings, and payload capacity must be verified for legal operation

Answer

The DOT requires all upfitted vehicles to be certified at a scale

Answer

The upfitter needs the curb weight to calculate the body's warranty terms

Answer

Scale weights are required for the chassis manufacturer's warranty compliance