Troubleshooting of Dongfeng Heavy Duty Truck Power Steering Pump

With the continuous development of science and technology, power steering devices in a variety of models in the application of more and more widely. Not only does it improve the driver's comfort in driving a car, reduce the intensity of work, but also improve the safety of car driving. At present, most light, medium and heavy-duty trucks manufactured by Dongfeng Motor Co., Ltd. have adopted power steering devices. Most of the steering pump configurations use a vane pump with stable performance and uniform flow rate. Although the types of steering vane pumps used in different models are not The same, but the steering vane pump works and signs of failure are basically the same. In order to enable users to correctly use and maintain the power steering pump for driving, the double-acting type YB steering vane pump used in the Dongfeng Heavy Duty Truck EQ1141G model is introduced as an example, and the possible faults To analyze and put forward specific troubleshooting methods. 1, double-acting structure and technical parameters of the YB-type vane pump 1.1, the structural characteristics of double-acting type YB-type vane pump has the advantages of compact structure, high pressure, uniform flow, smooth operation, low noise, wide range of applications . 1.2, technical parameters Dongfeng heavy truck power steering pump, such as EQ1141G series models are used double-acting YB vane pump, the maximum pressure of 14MPa; displacement 16mL / r; maximum speed 3200r / min; control flow 20L / min . 2, the use of steering vane pump maintenance considerations (1) summer and diesel engine models consistent with the oil (model 15W / 40 oil), the winter power steering fluid No. 8, prohibit the use of different models of oil mixed. (2) When the fuel is filled, it must be filtered by the filter on the steering oil tank to prohibit the oil from being directly added to the steering oil tank without filtering. (3) Fuel filling must be between the two graduated lines specified in the oil dipstick. Start the engine 3-5min after the fuel filling, check the fuel added to the required scale ruler. Too much oil spills easily after the engine is started, causing waste and destroying the vehicle capacity. If it is too small, it will easily cause the steering pump to ablate. (4) turn the tank to the vane pump, the steering between the inlet and the return pipe do not bend, easy to bend the tubing caused by the vane pump or power steering does not work. (5) vane pump, steering gear on the tubing joint spare cap not too tight, tighten the hand when in the end, and then plate wrench one-third of the circle can be. If the joint cap too tight, easy to damage the joint seals, resulting joints seepage, oil spills. 3, Troubleshooting 3.1, a fault 3.1.1, failure of the vane pump oil pump instability, when the pump oil is small, resulting in heavy light when the direction of time. 3.1.2 Analysis of the cause of the malfunction (1) steering oil tank insufficient. (2) oil deterioration, too dirty. (3) serious pipe bend. (4) vane pump abnormal work. 3.1.3, troubleshooting (1) Check the replacement model consistent with the steering oil, so that it is in the oil meter between the two tick marks. (2) Check the steering oil, if found whitish, thinning or impurities, should be replaced. When replacing the oil, first release all the modified oil, after adding new oil, start the engine 3-5min, and then release all the steering oil, so repeatedly 2-3 times until the steering gear, vane pump all the rinse oil clean , You can add new oil. (3) check to exclude tubing bending defects, if the rubber tube can not be restored due to bending deformation, should be given replacement parts. (4) remove the steering vane pump, check the blade coupling shaft is damaged, the blade is working properly, depending on the circumstances to be repaired or replaced. 3.2, the second fault 3.2.1, failure of the vane pump does not work, turn heavy. 3.2.2 Analysis of the causes of failure (1) vane pump shaft damage. (2) blade pump ablation. (3) turn into the pipe serious bend or damage. (4) vane pump inlet blockage. (5) steering oil model is wrong. 3.2.3, troubleshooting (1) remove the vane pump to check whether the transmission shaft damage, if damaged, should be given replacement. (2) Remove the vane pump Check whether the blade is ablated, repair or replace the assembly as the case may be. (3) Find out the reason of tubing kinking and correct it. Replace the pipe with a severely irreparable bend and broken pipe. (4) to find out the cause of the vane pump inlet blockage, give exclusion. (5) In the case of cold weather, to use the power steering fluid No. 8, prohibit the use of oil mixed or filling non-compliant oil. 3.3, fault three 3.3.1, signs of failure Vane pump pressure, heavy steering operation. 3.3.2 Analysis of the cause of the malfunction (1) steering vane pump blade damage. (2) steering vane pump pressure regulator valve spring is too soft or broken. (3) steering vane pump back to the oil hole is too large. 3.3.3, troubleshooting (1) check the steering vane pump blades, whether there is ablation, adhesion, damage and so on. (2) Remove the pressure regulating bolt on the side of the oil pipe of the vane pump and check if the pressure regulating valve spring is too soft. If this fault occurs, use the gasket in the pressure adjusting bolt recess to eliminate this fault. Can also be replaced by a soft spring method to eliminate this fault. At the same time, the broken spring should be given timely replacement. (3) steering vane pump back to the oil hole is too large, can take the replacement vane pump back cover, give exclusion. 4 Conclusion With the use of power steering devices in the car more widely, the correct use of vane pump maintenance methods to improve vehicle safety and extend the life of the vane pump is of great significance.

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