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

Grip the tire at 9 and 3 o'clock and push-pull to check for play

Answer

Measure king pin diameter with a micrometer while installed

Answer

Check king pin wear only by observing tire wear patterns

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

Brake chamber push rod travel

Answer

Ride height sensor calibration

Answer

Suspension torque rods for looseness

Question 3

Thrust angle alignment refers to:

Accepted Answer

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

Answer

The angle of the steering axis viewed from the front

Answer

The angle between the front axle and the frame

Answer

The toe-out angle measured during a turn

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

Heat the arm with a torch before installation to ease fitment

Answer

Press the arm onto the shaft without regard for spline orientation

Answer

Weld the arm to the sector shaft for a permanent connection

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

Reduced load capacity only

Answer

Increased ride height on that corner

Answer

Air spring damage on the opposite side

Question 6

What condition is indicated when a truck's steering requires significantly more effort to turn left than to turn right?

Accepted Answer

Internal leak in the power steering gear causing unequal assist in each direction

Answer

Low power steering fluid level

Answer

Worn drag link

Answer

Incorrect front axle toe setting

Question 7

Scrub radius is defined as the distance between:

Accepted Answer

The point where the steering axis intersects the ground and the center of the tire contact patch

Answer

The center of the tire contact patch and the vehicle centerline

Answer

The two front tire contact patches

Answer

The king pin and the wheel center at hub height