Exam 14: Recirculating Ball Steering Gears

Power recirculating ball steering gear operation is being discussed. Technician A says when driving the vehicle straight ahead, the spool valve and rotary valve position directs the power steering fluid flow back through the return hose to the pump inlet. Technician B says when driving the vehicle straight ahead, the power steering pump pressure is low. Who is correct?

Steering wander is the amount of steering wheel movement before the front wheels begin to turn.

Compare a constant ratio steering gear with a ratio of 13:1 to a constant-ratio steering gear with a ratio of 16:1. Which requires less steering effort?

A variable-ratio steering gear varies the gear ratio based on what?

Kickback is prevented in a power recirculating ball steering gear by:

What will a loose sector lash adjustment cause?

In a power recirculating ball steering gear with a variable ratio, the steering ratio remains the same regardless of steering wheel position.

In a power recirculating ball steering gear, when does the spool valve direct power steering fluid pressure to the appropriate side of the recirculating ball piston?

In a power recirculating ball steering gear, how is kickback prevented?

In a power recirculating ball steering gear, what is the purpose of torsion bar twist?

Technician A says a loose worm shaft thrust bearing preload adjustment causes excessive steering wheel free play. Technician B says a loose sector shaft lash adjustment causes excessive steering wheel free play. Who is correct?

Technician A says when driving a vehicle straight ahead, equal pressure exists on each side of the ball nut piston in a power recirculating ball steering gear. Technician B says when cornering with a power recirculating ball steering gear, torsion bar twisting positions the spool valve inside the rotary valve so fluid pressure is directed to the appropriate side of the ball nut piston. Who is correct?

An interference fit between the sector shaft and the ball nut teeth eliminates gear lash.

When a faster steering system is compared with a slower steering system, the faster system provides what?

Describe the flow of power steering fluid when a vehicle is driven straight ahead.

High steering effort may be caused by a worm shaft bearing preload adjustment that is too tight.

In a variable-ratio recirculating ball steering gear, the sector teeth have equal lengths.

In a power recirculating ball steering gear with the front wheels straight ahead and the engine running, the fluid on each side of the recirculating ball piston helps prevent what?

A loose worm shaft bearing preload adjustment may cause a rattling noise when driving on irregular road surfaces.

A worn flexible coupling may cause excessive steering wheel free play.