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        Your present location:HomeIndustry News > Analysis of the causes of common faults of dump truck

        Analysis of the causes of common faults of dump truck

        Number of visits: Date:2015-08-04 16:13:29
        Analysis of the causes of common faults of dump truck
        The following analysis methods of common faults of heavy dump truck:
        1 power failure. Heavy dump truck when a fault occurs in the power take off, the most direct and obvious results is a gear pump does not turn, hydraulic tipping system lost power, the whole system in a state of paralysis and could not work. Heavy dump truck with a pneumatic force taking device, which is mainly composed of a driving mechanism, a connecting mechanism, a control mechanism is composed of three parts. The most common failure of these three parts is the control mechanism, which uses solenoid valve switching gas way. Solenoid valve to control the operation of the cylinder, so as to complete the force to stop and take off. Solenoid valve in the process of unloading to frequent action, its parts easy to damage, so it is necessary to check the validity, sensitivity, circuit safety and switch, if the circuit is all normal, but also to check the working condition of the cylinder, there are no ventilation or leakage is now, if necessary, to remove the cylinder check. The transmission mechanism and the connecting mechanism should also carry out the maintenance and maintenance. When the gear meshing transmission mechanism of adverse, fork connected with the push rod bolts loosening, there will be abnormal sound, check all parts of the fastening bolts, while paying attention to check the lubricating oil, promptly clean up the dirt, keep parts clean and in good condition, prevent the bump and scratch. In addition, should always check the connection between the power and oil pump bushing, if not strong, damaged, take off, broken, should be replaced in time.
        2 oil pump drive shaft fault. Heavy dump truck pump drive shaft deformation or damage to the dumping mechanism completely lose effectiveness and the reasons generally have several: in the vehicle driving force is not disengaged. Because of the high-speed operation of the hydraulic pump for a long time, the hydraulic oil temperature rise very quickly, on the one hand will cause burning of oil pump oil seal, oil pump "burned", another serious consequences is gear pump centrifugal force to increase, oil pump drive shaft will in this large centrifugal force caused by deformation, damage; vehicle load lifting, excessive operation. If the force screw up the clutch pedal, because the system suddenly joined the force taking device, pump shaft and the pump itself caused great impact load, the most likely to cause transmission shaft damage. While the engine is running at high speed, the low temperature in winter, the larger the viscosity of oil in the hydraulic cylinder, the loss is more prominent; the transmission shaft is too small, the oil pump is poor, the oil circuit is blocked and the serious overload, it will cause the transmission shaft deformation, damage. When the pump shaft is deformed or damaged, should be timely maintenance and replacement, should always pay attention to avoid the occurrence of damage to the drive shaft work, such as unloading and ready to travel, and confirm the disengaging force taking device is disengaged after driving; full lifting handle, said lifting position, the operation should be smooth, action not rude, slowly release the clutch pedal, so that the pump operation, so that the car in the car slowly rising; load drop, avoid the distribution valve to pull the lifting position, this can easily cause a strong impact, resulting in premature failure of the drive shaft; in addition, should always check the transmission shaft installation space whether it meets the requirements, the drive shaft engaged with the universal joint fork length is suitable.
        3 leakage.
        - leakage and sealing of oil pump. Heavy dump truck oil pump shaft neck is installed two self tight seal, if scratch of the spline shaft, or inside the heavy fall too fast, oil cavity pressure is too large will cause damage to the oil seal, leak; integrated pump valve of oil pump and oil pump with the transition plate between the O-shaped sealing ring sometimes due to uneven stress and leakage, so that the pump noise increases, pressure is low. Therefore, in the installation of oil seal shaft neck to be careful. In integrated pump valve to the pump, the pump transition plate with a distribution valve between the sealing ring, fastening bolts, where much leakage, the reason is the loosening of the bolts and the damage of the sealing ring, engagement surface impurities, general fasteners to high voltage side of the bolt, replace the sealing ring, two cleaning surface, coated with sealant.
        - distribution valve leakage and seal. Leakage distribution valve is mainly concentrated in the stem ends and a one-way valve cone. Should always check the valve stem, valve wear, so that with the gap remains in the appropriate range. If you want to change the stem type, at both ends of the sealing ring should pay attention to force uniform, moderate elastic, do not scratch the stem.
        - hydraulic cylinder leakage and seal. Between the hydraulic cylinder and the cylinder head, piston rod and cylinder head, piston and piston rod between parts are prone to leakage, when the vehicle is long-term disabled, hydraulic cylinder to stop working for a long time, sealing ring static friction resistance, wear is intensified, and hydraulic cylinder reciprocating frequency, piston velocity is too fast, increase the wear of the sealing ring, the two will be to increase the leak, so in the practical work to attract attention.
        - leakage and sealing of hydraulic line. Dongfeng series dump truck hydraulic lines using plane O-shaped ring seal, mainly distributed in place between the high and low pressure pipe with a distribution valve, hydraulic cylinder and the oil inlet pipe, oil import and tubing. Most of the leakage of the pipeline is caused by bolt loose, seal ring damage, dust, etc., can be appropriate to take the fastening bolts, change the sealing ring, cleaning and other methods to solve the surface. In addition, it is also necessary to develop regular inspection, regular maintenance of good work habits, once found that the cracks must be replaced immediately.

        TypeInfo: Industry News

        Keywords for the information:The dump truck fault 

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