The power steering wheel is spinning: possible causes. Repair of GUR

Without a power steering (GUR), today there is not a single car equipped with the orientation to the modern level of driving comfort. The hydraulic mechanism facilitates the physical control of the machine while maintaining the optimum degree of feedback and compliance with safety requirements.

This is achieved by the introduction of an auxiliary mechanism in the steering wheel system, the technical condition of which must be regularly monitored. If, after a certain time of using the machine with such equipment, deviations in the mechanism are observed, then it is necessary to prepare for its repair. For example, if the steering wheel with the power steering is tight, there may be several options for getting out of position. But first we should consider the design of the mechanism and the principle of its operation.

How is the GUR arranged?

The hydraulic booster system is multicomponent, but closed. Part of this device is due to the complexity of repairing the structure. A typical mechanism includes a pump, a reservoir with a tank-like fluid, a pressure regulator, a power unit and a spool. The pump is connected to the engine drive system of the machine, and the pressure regulator ensures that the force flow is balanced against the spool. The operating difference in the pressure indices depends on the reserve of the control fluid.

It is this part of the functional in most cases that leads to problems, due to which it is required to repair the GUR in the form of correction of the position of individual parts of the structure or by updating the oil. In turn, the hydraulic cylinder interacts with the steering rack, broadcasting an additional effort. To ensure that the final load required to bring the rudder to activity is balanced, the spool itself is installed on the column - in the future it will respond to the rotational moment when the driver performs the manipulations.

What are the signs of the problem?

The feeling of heaviness when steering the steering wheel does not always appear abruptly and at one moment. This can be a long process, during which warning signs may appear. In particular, primary diagnostics will help to detect a problem with the formation of leaks, noise and excessive vibrations. In time, a tight steering wheel will be added to this list, if the same leakage is not stopped, and the fluid supply is replenished. Of course, the above signs can also indicate the emergence of other problems, not only with the hydraulic booster. Therefore, the overall diagnosis in this case will not be superfluous. It also allows you to more accurately determine and the possible cause of weighting the steering wheel.

The main reasons for the tight steering

Factors that can lead to difficulties with the operation of the steering wheel due to the hydraulic booster are many. Each of them assumes its approach to repair. One of the most common causes is the presence of air in the niches of the hydraulic amplifier. Its presence not only negates the main function of the mechanism, but also gives the opposite effect, weighting the movements of the steering wheel.

Another common cause is the aforementioned devastation of the surge tank with liquid. If we determine the reason why the power steering wheel does not rotate, it is meaningful to turn to the technical state of the individual components of the system. For example, the wear of parts, especially the drive belt, could indirectly provoke a lowering of the hydraulics function. In this case, it is possible to avoid a complete revision of the mechanism and, possibly, its replacement. Do not rule out the likelihood of a malfunction in the steering wheel itself. For example, a rake in a part of a bundle with a gearbox can bring even more trouble in terms of repair.

How to disassemble a tight steering wheel?

To ascertain the reasons for which the weighting of the steering wheel could have occurred, it is necessary to disassemble the mechanism. The event begins with the disconnection of the pipelines leading to the expansion tank and the steering system. At this stage, you can drain the liquid. Next, the drive belt is removed from the pump - again, if it is not in good condition, then it will be necessary to put on a new belt.

Here, three pulley locking blocks, suitable for the pump unit, are unscrewed. But depending on the type of fastener system, there may be more. After that, access to the fixation elements of the pump itself can be opened. As can be seen, repair of the GUR can already be performed at this stage, replacing the fluid by updating the hoses and the drive belt. But this may not be enough. Separate attention should be paid to the filtering system. Even if it regularly performs its function, it is not ruled out a violation during the cleaning phase, which can not be determined in the garage conditions. Therefore, if there are no other obvious causes of the problem, it makes sense to check the filters in a professional workshop.

Getting rid of excess air

If the reason is that there is excess air in the system, then in a sense you can talk about luck. However, even here everything is ambiguous. Most often this problem is solved by several turns of the rudder, brought to a stop. And this action is carried out in both directions. As practice shows, this allows you to push out excess air from the hydraulics communications. But if, after this action, the steering wheel turns hard, it is more likely that the tank is air-blown. This means that the system works with a liquid in which bubbles are present. This factor and causes the lack of ease of handling of the steering wheel. Eliminate this problem will help complete fluid renewal in the expansion tank.

Liquid replacement

For this, it is not necessary to make a complete analysis of the mechanism. In the first place, you must release the two nozzles leading to the expansion tank from the clamps. Also, if necessary, remove additional fasteners and belt communications, because of which access to the tank is difficult.

Direct replacement of the liquid can be done without a complete dismantling of the tank. The spent mixture is simply pumped out, after which it remains to pour in a new auto chemistry. However, if the steering wheel with the hydraulic booster is tight, which has not been checked for a long time, it is desirable to dismantle the tank for further diagnostics. It should be checked for leaks, then rinsed thoroughly and rinsed with clean water. The dried tank is placed in its place, filled with a new working fluid and fixed with fasteners.

Which liquid is preferred?

The choice of hydraulic fluid also imposes a considerable responsibility. It is desirable to give preference to synthetic hydraulic mixtures made of high-quality components. The usual engine oil in this case is not good. Special features include a sufficient degree of fluidity, viscosity and ability to work at extreme temperatures.

Often, problems of this kind are found precisely in winter, when the flooded liquid can not perform its tasks simply because of freezing. Therefore, the question of which oil should be poured into the power steering should only be decided in favor of special synthetic or semisynthetic mixtures, which usually have a dark green hue. If to speak about manufacturers qualitative autochemistry of this type lets out companies Motul, Castrol, Pentosin, Liqui Moly etc. The cost of the liquid is about 800-1000 rubles, but even a small canister will last for a long time, so you should not save on this resource.

How to replace the heavy steering wheel?

The dismantling of the system begins with the said disconnection of all pipelines, branch pipes and fasteners. Also, without fail, the oil poured into the expansion tank is drained or pumped out. Install the new system in the reverse order. If it is a question of complete updating of a steering complex, in this case it is necessary to dismantle and the rack itself. Such a replacement of the power steering should be done in conditions where there is a mounting rig. Installation begins with the integration of the steering wheel, and then the hydraulic components are alternately integrated. Lastly, the working fluid is poured in, and the elements of the communication supply are supplied.

Conclusion

By itself, the steering wheel steering control system is quite complex and often delivers problems with the identification of the reasons for its incorrect operation. In the event that the steering wheel with the hydraulic booster of the car with which the wheels are running is tight , it is quite possible that the problem will be precisely the insufficiently inflated tires.

In this situation, the difficulty is due already to the mechanics of the interaction of the rubber with the coating, the effect of which is transferred even to the working hydraulics. Also, the tension of the drive belt may affect the function of the amplifier. That is, before starting repair work, the user must perform a full inspection of the car for the presence of factors that may affect the operation of the steering column.