hydraulic assist system. ( suspension and steering)

What is the purpose of the hydraulic assist steering system?

It provides steering assist to the mechanical steering system

Thicker the bar- more road feel but more difficult to twist. True or false

True

Thinner the bar- less road feel but easier to twist. True or false?

True

what protects the rack gear and inner sockets from road splash and dirt?

Bellows boots

Steering gears provide the same mechanical advantage through the entire turning range. Is this fixed or variable ratio?

Fixed ratio

Steering in the centre is slightly heavier to provide more road feel in the centre position. Is this variable or fixed ratio?

Variable ratio

Is this non rack pinion steering gear or rack and pinion steering gear ?. variable ratio steering is accomplished by changing the shape pf the teeth on the rack gear

Rock and pinion steering gears

is this non rock and pinion or rack and pinion? Variable ratio is accomplished bu changing the length of the teeth on the sector shaft.

Non rack and pinion steering gear

Which component provides a constant supply of hydraulic fluid to the system?

The hydraulic assist steering pump

Which hydraulic assist steering pumps that deliver the same volume of fluid on each revolution?

Positive displacement

which hydraulic assist steering pumps only produce useable pressure when the pump outlet is restricted.

Demand pumps

which hydraulic assist steering pumps Have the same number of inlets and outlets?

Balanced pumps

Which pump operates by turning a rotor inside an oval shaped cam ring?

Roller, vane, and slipper pumps

Prevents erosion damage to the gear and overheating pf the fluid by directing excess flow back to the pump inley.

Flow control valve

During a turn…

The flow of fluid through the valve is decreased due to increased restriction in the steering gear

What valve prevents high pressure damage by limiting maximum pressure?

The pressure relief valve

Hydraulic pump that are driven by an electric motor is?

Electromechanical assist pumps

fluid from the pump is able to flow virtually unrestricted to the reservoir. The left and right turn chamber are exposed to the pump outlet pressure.

straight ahead driving

The spool valve and valve body misalign and redirect fluid flow in the steering gear the pressure pushes the piston to move left and the fluid on the other side is being pushed back to the reservoir. Which direction is this turning?

Left turn

the _____ turn chamber is connected to the pump and blocked from the return to the fluid reservoir, the pressure is pushing the piston to the right and pushing back the fluid from the other side back to the reservoir

Right turn

in relaxed position on the steering wheel on turn, the torsion bar untwist and returns the valve components back into alignment. The pressure is the sake in both turn chamber, so no assist is provided. True or false?

True

When the passage is being only partially restricted this is called?

Partially assist

the steering gear tries to turn in response to a road shock, the fluid on both sides of the power piston provide a hydraulic cushion to prevent sudden steering wheel jarring. True or false?

True

Hydraulic assisted steering is most valuable at high speed, but assisted steering reduces a drivers sense of control at lower speed. True or false? Explain

False, it’s the other way around dumbass

At low speed, the electromagnet assist tge drivers effort to twist the torsion bar resulting in more steering assister. At higher speed, the MSVA controller reverses the polarity of the magnet. Resulting in less assist. True or false?

True

List the 3 things of Steering gear diagnosis

• fluid leaks

• Noises

• Performance problem

what’s the complain does the customer say when there is…

• misrouted hoses

• Restriction in hoses

• Damage or misaligned steering column boot to fire wall seal

Hissing or whistling sounds while turning the steering wheel.

Rattle or excessive clunking possible causes are

• steering gear loose on frame

• Loose steering linkage components

• Intermediate steering shaft

Possible causes when there is a whine, growl, or moan?

• low fluid

• Air in fluid

• Wear in hydraulic pump internal components

Thrust bearing preload adjustment does not eliminate play in the stub and worm shaft assembly. True or false

False. Thrust bearing preload adjustment ELIMINATES play in the stub and worm shaft assembly

On rock and pinion steering gears, variable steering is accomplished by changing the…?

Shape of the teeth on the rack gear

what deliver the same volume of fluid on each revolution?

Positive displacement

What is the correct order for two adjustment during the reassembly?

• thrust bearing preload adjustment ELIMINATES load

• High spot

What does high spot eliminates?

this adjustment eliminates all play in the straight ahead steering position.