Hydraulic Assist Steering Flashcards
(20 cards)
Steering assist is provided by ___________
A hydraulic pressure difference
List two configurations of rack and pinion steering gears
- End take off
- Centre take off
On rack and pinion steering gears, variable ratio is accomplished by changing the _________
Rack gear teeth
The rack gear and inner tie rods are protected by the __________
Bellows boots
Name four designs of hydraulic assist pumps
- Vane pump
- Roller pump
- Slipper pump
- Gear pump
What are the three common properties of hydraulic assist pumps?
- Positive displacement
- Demand
- Balanced
Positive displacement means that the pump ______________
Delivers the same volume per revolution
Pressure is created by a ___________
Restriction
The flow control valve is designed to ___________
Regulate fluid flow
Electromechanical assist pumps do not require a ____________
Flow control valve
List the two components that make up a directional control valve
- Spool valve
- Valve body
The directional control valve components are held in alignment by the ___________
Torsion bar
True or false: When the directional control valve is in alignment, the pressures in the turn chambers are equal.
True
True or false: When the directional control valve is misaligned, the pressures in the turn chambers are equal
False
True or false: In order for the directional control valve to be aligned, the steering wheel must be in the straight ahead position
False
Variable assist steering provides full assist at ____________ speeds
Parking lot
List the two adjustments in order on a non-rack and pinion steering gear
- Worm bearing preload
- High spot / over centre mesh
List the two items you have to check before you use the steering system analyzer
- Fluid
- The drive system
Closing the valve on the steering system analyzer three times and noting the pressure readings is a test for what component?
Pressure relief valve
True or false: Manually flushing a hydraulic steering system should be done with the engine running
False
