310T Tires, Wheels, and Hubs

Question 1

When mounting dual tires on a truck rear axle, what is the MOST important matching requirement between the two tires on the same axle end?

Accepted Answer

Both tires must have matching overall circumference (rolling radius)

Answer

Both tires must be the same brand and model

Answer

Both tires must have the same tread pattern depth

Answer

Both tires must have the same manufacture date code

Question 2

A truck wheel stud breaks during wheel removal. Upon inspection, the remaining studs show a characteristic 45-degree angular fracture surface. What is the MOST likely cause?

Accepted Answer

The lug nuts were under-torqued, causing the wheel to loosen and fatigue the studs

Answer

The wheel was installed with the wrong bolt-circle pattern, overloading the studs laterally

Answer

The studs failed due to over-torquing that exceeded the material's shear strength

Answer

Corrosion between the wheel and hub caused galvanic weakening of the studs

Question 3

After replacing a wheel hub bearing assembly on a truck steer axle, the technician must adjust the bearing preload. Which method correctly describes the adjustment sequence?

Accepted Answer

Torque the adjusting nut to seat the bearing, back off to zero drag, then advance to the specified low preload torque while rotating the hub

Answer

Tighten the adjusting nut to full torque, then back off one full turn

Answer

Tighten the adjusting nut until hub rotation requires 5–10 kg of pull on a torque wrench, then lock

Answer

Install the nut finger-tight only and rely on the wheel load to seat the bearing during initial driving

Question 4

A technician inflates a truck tire to the maximum pressure stamped on the tire sidewall instead of the pressure specified in the vehicle manufacturer's placard. What is the likely consequence?

Accepted Answer

Harsh ride, uneven tread wear, and potential overloading of wheel components

Answer

Improved load-carrying capacity and fuel economy

Answer

Reduced stopping distance due to increased contact patch rigidity

Answer

Reduced risk of heat buildup and blowout at highway speeds

Question 5

A truck's Tire Pressure Monitoring System (TPMS) warning light illuminates at highway speed but goes out after 15 minutes of driving. What is the MOST likely explanation?

Accepted Answer

Normal tire pressure increase from heat build-up bringing pressure back above the warning threshold

Answer

A faulty TPMS sensor that needs replacement

Answer

A slow leak in one tire that sealed itself due to centrifugal force at highway speed

Answer

The TPMS receiver antenna is loose and losing signal intermittently

Question 6

When using a torque stick (torque-limiting extension) to tighten truck lug nuts with an impact wrench, which statement is CORRECT?

Accepted Answer

Torque sticks are a convenience tool only and must always be followed by a calibrated torque wrench for final verification

Answer

Torque sticks provide accurate final torque regardless of impact wrench power output

Answer

Torque sticks eliminate the need for re-torquing after initial 50 km of driving

Answer

Using a torque stick in reverse to loosen lug nuts will reset its calibration