Every driver has noticed at least once in his life how much easier it is to drive a car in a parking lot or in slow motion than at high speed. Behind this comfort is power steering - a system that has become a standard in the automotive industry and has made life much easier for drivers. Without this mechanism, parking a heavy SUV or even a mid-size sedan would turn into a grueling physical workout.
The system operates by using fluid pressure to create additional force to help the driver turn the wheels. Hydraulic booster takes on the main load, allowing you to control the machine with light hand movements. However, despite its reliability, this system requires attention and regular maintenance, which car owners often forget about.
In this article we will analyze the power steering device in detail, consider typical faults and give practical advice on extending the service life of the mechanism. Understanding how your car works can help you avoid costly repairs in the future and keep you safe on the road.
The design and principle of operation of the hydraulic booster
The basis of the system is power steering pump, which creates the necessary pressure in the circuit. It is driven by a belt from the engine crankshaft, which means that the mechanism is constantly running when the engine is running. Inside the pump there are blades or gears that drive a special liquid in a closed circle, creating a force of several tens of atmospheres.
The key element that distributes flows is distributorconnected to the steering shaft. When you turn the steering wheel, the distributor opens channels to supply oil to one of the cavities of the hydraulic cylinder, pushing the piston and helping the wheels turn. In the neutral position, the fluid simply circulates through the system without creating pressure on the piston.
It is important to understand that working fluid here it not only performs the function of transmitting pressure, but also lubricates rubbing couples, and also removes heat. Therefore, its quality and level directly affect the durability of the entire system. Overheating or oil contamination can quickly destroy an expensive pump.
Is it possible to drive with the power steering not working?
Yes, this is physically possible, since the mechanical connection between the steering wheel and the wheels is preserved. However, the force on the steering wheel will increase significantly, which is dangerous in emergency situations. In addition, running the pump without fluid or when jammed can lead to a broken belt and engine shutdown if it also drives the pump or generator.
Types of power steering fluids and their replacement
A Question of Choice hydraulic oil often baffles inexperienced motorists. Manufacturers use different specifications, and mixing incompatible types of fluids can destroy the rubber seals and cause system failure. The main division occurs by color and chemical basis.
There are mineral, semi-synthetic and synthetic fluids. Mineral oils, often red or yellow in color, are most common in older systems. Synthetics, usually green in color, have better temperature properties, but are aggressive to some types of rubber. It is strictly forbidden to mix red and green liquids. - this will lead to the formation of sediment and foaming.
The fluid is replaced either by a partial method (pumping out from the tank) or by a complete method, with flushing the system. A complete replacement requires a lift and skills, since it is necessary to drive fluid through the system with the engine running, alternately turning the steering wheel until it stops.
Before purchasing new fluid, be sure to check the instructions for your car or the label on the power steering reservoir cap. Using the wrong type of oil may require complete replacement of all rubber seals in the system.
Typical faults and their symptoms
Power steering is a fairly reliable system, but it does not last forever. Most often, drivers encounter belt wear, fluid leaks, or problems with the pump. Timely diagnostics helps to identify the problem at an early stage, when repairs do not yet require replacement of the complete unit.
One of the most common problems is the appearance of extraneous sounds. Buzzing or a whine when turning the steering wheel usually indicates low fluid levels or air getting into the system. If you ignore these sounds, the pump will start to run dry, which will lead to its rapid destruction.
It is also worth paying attention to the behavior of the steering wheel. If it begins to rotate tightly only in one direction or jerkily, perhaps the problem is in the distributor itself or the spool mechanism. A visual inspection of the hoses and pipes under the hood often helps to find the source of the leaks.
Diagnostics: table of signs and causes
To simplify troubleshooting, it is convenient to use structured data. Below is a table to help match symptoms with possible causes. Remember that only a specialist can make an accurate diagnosis after a detailed examination.
| Symptom | Probable Cause | Required actions |
|---|---|---|
| Humming sound when turning the steering wheel | Low fluid level, air in system | Check the level, add oil, bleed the system |
| Heavy steering at idle | Low belt tension, pump wear | Tension or replace the belt, check the pump pressure |
| Fluid loss under the car | Worn seals, cracks in hoses | Visual inspection, replacement of seals or hoses |
| Jerks when turning the steering wheel | System contamination, distributor problems | System flushing, fluid replacement, rack repair |
Using this table will allow you to formulate the problem more precisely when contacting service. Even minor leaks should not be ignored, as the loss of the working environment quickly leads to critical situations.
Operating instructions and precautions
To power steering served for a long time, you must follow simple operating rules. The main mistake drivers make is holding the steering wheel in the extreme position for more than 5 seconds. At this moment, the pressure in the system reaches a maximum, and fluid removal is minimal, which causes overheating of the oil and increased load on the pump.
⚠️ Attention: Never leave a car with the engine running for a long time with the wheels turned all the way. This can lead to extrusion of the seals and rupture of high-pressure pipes due to a critical increase in temperature and pressure in the circuit.
It is also important to monitor the condition of the drive belt. Breaking it while driving will deprive you of not only power steering, but also, possibly, the water pump, which will lead to overheating of the engine. Regularly check the tension and absence of cracks on the belt.
☑️ Monthly power steering check
Hydraulic booster vs electric booster
With the development of technology, classic hydraulic booster is gradually giving way to electric analogues (EUR). In electric power steering systems, the force is created by an electric motor, which saves fuel, since there is no constant load on the engine from the pump. However, power steering is still valued for its more natural road feel and reliability in difficult conditions.
Hydraulics better absorb shock from the wheels, transmitting less vibration to the steering wheel, which is important for comfortable driving on bad roads. In addition, power steering repair is often cheaper than replacing an electronic control unit or power steering motor. The choice between them is a choice between classic reliability and modern efficiency.
It's worth noting that modern electro-hydraulic systems try to combine the best of both worlds by using an electrically driven pump that only turns on when the steering wheel is turned. This reduces fuel consumption and eliminates belt dependency.
Classic power steering requires regular replacement of fluid and belts, but provides better protection against impacts on bad roads compared to cheap electric power steering.
Maintenance and repair costs
The financial issue is always relevant. Power steering maintenance is usually cheaper than repairing electrical analogues, if you do not have to replace the pump assembly. The cost of work greatly depends on the make of the car and the availability of spare parts.
Replacing the fluid and filter (if there is one in the tank) is an inexpensive procedure and available at any service center. But restoring the pump or replacing the rack may require significant investment. Cheap Chinese analogues of pumps often do not last long, so it is better to look for original refurbished units or high-quality brand replacements.
⚠️ Attention: When purchasing a remanufactured pump or rack, be sure to ask for a warranty. The quality of hydraulic restoration varies greatly, and defects can appear in the first hundreds of kilometers.
Frequently asked questions (FAQ)
How often should the power steering fluid be changed?
Manufacturers often say that the fluid is filled for the entire service life, but practice shows that it is better to change it every 60-80 thousand kilometers or every 3-4 years. This helps preserve the life of the pump and distributor.
Why does the power steering howl when it's cold?
The “cold” hum is often associated with thickening of old oil or wear of the Teflon rings in the pump, which do not provide proper tightness before warming up. If the sound disappears after warming up, the system is still functioning, but requires attention.
Is it possible to use ATF fluid for power steering?
In many cars (especially Japanese and American) the power steering is actually filled with ATF transmission fluid. However, this must be explicitly stated in the instructions. It is impossible to pour ATF where special hydraulic fluid is provided.
What happens if water gets into the power steering?
Water washes away the lubricating properties of the oil, which leads to dry friction and rapid wear of the pairs. In addition, water causes corrosion of metal parts. If you suspect water ingress, the system must be flushed immediately and the oil replaced.