310T Steering and Suspension Systems 5

Question 1

A technician is performing a front-end inspection on a truck with I-beam front axle. Checking for king pin wear, the CORRECT method is to:

Accepted Answer

Support the axle to unload the wheel, then grip the tire at 12 and 6 o'clock and rock it to check for vertical play

Answer

With the axle unloaded, rocking the tire at 12 and 6 o'clock reveals king pin vertical play; 9 and 3 o'clock rocking checks wheel bearing play.

Question 2

A motorcoach with air suspension repeatedly triggers the low-ride-height warning on one rear corner. The air spring, height control valve, and supply air check out fine. What should be inspected next?

Accepted Answer

Air lines and fittings for slow leaks between the height control valve and the air spring

Answer

Slow leaks in the air lines between the height control valve and spring allow the spring to bleed down when stationary, triggering the low-height warning.

Question 3

Thrust angle alignment refers to:

Accepted Answer

The direction the rear axle(s) push the vehicle compared to the vehicle centerline

Answer

Thrust angle is the direction the rear axle(s) propel the vehicle; if not aligned with the vehicle centerline, the vehicle will dog-track or the steering will be off-center.

Question 4

When replacing a pitman arm on a truck steering system, the technician should:

Accepted Answer

Align the master spline and torque the retaining nut to specification with a thread-locking compound

Answer

The master spline ensures the pitman arm is installed in the correct position relative to gear center; torquing to spec prevents loosening under load.

Question 5

A leaf spring on a heavy truck is found to have a broken center bolt. What is the PRIMARY concern with continued operation?

Accepted Answer

The axle can shift fore or aft under the spring, causing misalignment and potential loss of control

Answer

The center bolt locates the axle on the spring pack; if broken, the axle can shift longitudinally, altering brake geometry and potentially causing severe handling instability.

(310t) Truck and Coach Technician Certification Practice Test

(310t) Truck and Coach Technician Certification Practice Test

310T Steering and Suspension Systems 5