Because the production base and the customers demand are at a certain distance, some are in the same city, some are too far apart, and the transportation methods are also different. Often, however, it is not the hydraulic valve itself that is defective, but the solenoid coil or the supply line of the valve. There is not enough hydraulic oil in the cylinders if the lifting speed of the lift table deviates greatly from the normal speed. A leak in the hydraulic line or incorrectly tightened connections can cause hydraulic oil to escape from the pressure line. In most cases, this is bearing damage. If this seat is dirty, the ball no longer seals properly. To prevent uncontrolled downward movement of the lift table platform, the cylinders are usually equipped with a pipe rupture safety valve. If electrical power is not required, the lift table should be disconnected from the power supply. motor capacitor lift problems repair vehicle box ramp housing 114 0 obj <> endobj 141 0 obj <>stream tork.pdf This could cause the platform to lower jerkily. Soak a clean rag in hydraulic oil and wipe it on the piston rod of the hydraulic cylinder to fix this problem. If the electric motor is running and its direction of rotation is correct, but the lift table does not lift, this could indicate a defect in the hydraulic pump. Voltage fluctuations on the mains side may be a possible cause, but it can also be an insulation fault and an associated short circuit. For this reason, the lowering movement of the lift table is stopped. As with all faults, it is important to question why it has occurred. The hydraulic system must be bled. But it can also be an insulation fault and an associated short circuit. amatrol hydraulic intermediate hydraulics troubleshoot Make sure that all cylinders are fully retracted. These can be attributed to the acceleration forces that occur. A soiled lowering valve would have the same effect as a soiled check valve. lift You can first try to flush the check valve through alternating backward and forward movement. Clean or replace the muffler. This means that repeated lifting and lowering of the lift table platform already eliminates the problem. If you find any problems, contact the manufacturer in time to avoid the warranty period. Below is a list of the most common causes of faults. submersible hydraulic pump The hydraulic connection on cylinders without a bleed screw must be loosened slightly. Check for a clogged exhaust muffler if the lift lowers too slowly. of the lift freight elevator are complete, whether there is any omission, whether there is damage, etc., after the inspection is completed, sign for receipt. xIFkM*P .ed%#-mz-ZjM@/r0(ijC|[3 The overflow valve is generally placed inside the pump station with an adjustment valve on one side. Dangers arise in particular from the possibility of the hose rupturing. The same applies, of course, to a bypass that may be installed. The loss of hydraulic oil or an oil level that is too low prevents the top lifting position from being reached. This means that although you can hear the hydraulic motor being actuated and started, the lift table does not lift. If the pressure in the hydraulic system is too high, part of the oil is pumped directly into the power unit tank to protect the lift table components against damage.Furthermore, the motor protection switch of the drive motor may have tripped. Please note that this usually does not affect the control voltage of the lift table. Simple cleaning of the running surfaces with a hand brush and cleaning cloth is usually sufficient to fix this fault. Replace the hydraulic oil if necessary. There are countless different designs and models on the market only among standard lift tables . After customizing the lift freight elevator according to customer needs, it needs to be loaded and transported to the customer site. How does this fault manifest itself? Make sure not to overtighten screw connections on hoses. If the operating pressure exceeds the set pressure of the pressure relief valve, oil flows back into the tank. The causes of faults and solutions listed here are limited to a hydraulic scissor lift table with a commercially available structure. A ball valve is installed in this line, which connects the pressure line directly with the tank in the open position and so simulates a hose or pipe rupture. How to Adjust Tension on a Yale Hydraulic Door Closer, Garage Door Opener Makes Noise but Won't Work, Copyright 2022 Leaf Group Ltd. / Leaf Group Lifestyle, All Rights Reserved. 1. This effect is still relatively small with hydraulic oil. Of course, a hydraulic lift table is not immune to this. To rectify this fault, you must raise the lift platform again to open the pipe rupture safety valves. However, if air gets into the hydraulic system, it is also compressed by the pressure and the volume is reduced. The pressure relief valve is a kind of overload protection in the hydraulic circuit and protects the installed components against unacceptably high pressure. If the cylinders remain extended for a long time, there is a risk that the piston rods will dry out. You will find a list of possible causes under each heading. Otherwise youre in for a nasty surprise the next time you retract the hydraulic cylinders (the hydraulic tank would overflow). The longer the running time, the higher the thermal energy introduced. 3| D-49779 Niederlangen| +49 (0) 5939/967 96 90| info@j-lifte.com, Vermeidbare Fehler in der Projektausfhrung. If the lift table manufacturer has fitted the cylinder with a bleed screw, bleeding can usually be done effortlessly. If the lift table is operated close to or above the load limit, it can be that hydraulic oil is fed into the tank via the pressure relief valve. Check whether hydraulic oil has leaked somewhere and fix the leak. Replace the valve if it is found to be irreparably damaged. Mobile Phone: +8618660129317 (Whatsapp/Viber/Wechat), After-Sales Service Hotline: +86 133 6106 4776, Address: No.14, Xinlonghai Industrial Park, Qudi Town, Jiyang District, Jinan, China, The Best Way of Hydraulic Goods Lift Trouble shooting, The Best Way of Hydraulic Goods Lift Troubleshooting, Failure adjustment of hydraulic goods lift, How to make sure your hydraulic goods lift under good condition, 14m Trailer Boom Lift for Our Fiji Client, How better to use warehouse goods lift correctly. Make absolutely sure that the pipes to be opened are depressurised. If the pressure in the oil cylinder or the oil pipe is too high, serious failures of blasting may occur. During the transportation of the lift freight elevator, pay attention to the road conditions, check whether the rope is loose, whether the equipment is swaying, and avoid the loss and fall of equipment parts and accessories due to vehicle vibration. If necessary, a reset button must also be pressed to enable the lift table to move again. If there is no or too little hydraulic oil in the tank, first find the cause and, if necessary, eliminate it. The next step would be to remove the valve and clean it with compressed air. To eliminate this source of fault in the future, it should also be secured against being re-opened. Hydraulic oil would enter the tank from the cylinders and the lift platform would lower. For example, the cause can also be that safety edge got caught. Its function is to prevent the hydraulic system pressure from being too high and to protect the hydraulic system settings. ]OP):gCS]`. Very often the cause is simply that the lift table is overloaded. Mit Nutzung dieser Seite akzeptieren Sie Cookies. It is dangerous to simply set the overflow valve. After the relief valve was adjusted, the lifting speed did not increase, but the rail-type lift freight elevator failed to stop the operation. In most cases, the limit switches are installed in such a way that the end positions can be set flexibly. Always follow the instructions of the lift table manufacturer regardless of the kind of work being done on the lift table. If an overload can be ruled out, the only remaining problem is unfortunately a defective hydraulic pump. If bearings are nevertheless damaged, the manufacturer can replace the bearings if necessary. This should be prevented through appropriate instructions, as this function is not intended by lift table manufacturers. Move the lift table against the stop until only hydraulic oil without air pockets escapes from the bleed screw. The above is the knowledge of freight elevator transportation and loading and unloading, I hope it will be useful to everyone. This means that the cause of an unintentional lowering platform must also to be sought in the hydraulic system. The cause of this fault is generally very easy to find. Eliminate the cause of the leak before using the lift table again. When the speed of the hydraulic lifting platform slows down, check whether the oil supply flow of the hydraulic pump is stable. The solution to this problem is relatively simple. In these cases, a broken cable or similar fault has probably prevented the lift table from lowering. To rectify this fault, you must check the entire main power connection (including the main switch) and eliminate the cause of the power failure. Janzen Lifttechnik GmbH| Rudolf-Diesel-Str. As a rule, you should leave this work to the lift table manufacturer. Work may only be carried out by personnel trained by the manufacturer or by qualified technicians. Due to the greater compressibility, the change in volume at the same pressure is much greater and the load drops noticeably. Then top up the hydraulic oil. If you can hear a slight 'bubbling sound, this indicates air in the hydraulic system. *7Z9h2^A2:.f}a99Px+gC9;PW1DD9pqW/ X8 I h9XRh2CPq xe@DD*B""w/"8dp<5d09nClrg(8"Chr1q \R`""V:#. After the hydraulic oil is used for a long time, there may be impurities or deterioration in the hydraulic oil. A defect in the coupling is more likely than mechanical damage to the hydraulic pump, though. Commercially available lift tables, on the other hand, are usually equipped with maintenance-free plain bearing shells that are adapted to the planned service life of the lift table. However, this means that the solutions listed here cannot be applied to all hydraulic lift tables. The equipment has landed safely, this is the customer needs to verify whether the tonnage, size, parameters, accessories, etc. In this case, the hydraulic pumps simply lack the necessary oil to be able to extend the cylinders further. Dirt on the running surface of the roller bearing can prevent the non-locating bearing roller from running smoothly. The customer of the rail-type elevator freight elevator stopped the failure because of self-adjusting the overflow valve. It is also important not to exceed the maximum filling level mark. Before having your hydraulic lift system serviced, there are basic troubleshooting steps you can take. 3 Types of Mobile Scissor Lifts From MORN LIFT: Which One is Best Suitable for Your Business? husqvarna bf manual parts manualslib manuals This means that the motor is no longer supplied with power and that is the reason why there is no power to move the lift table. Hydraulic pump is also an important factor affecting hydraulic oil flow. Hydraulic lift technology is renowned for its sturdiness and durability, yet after much wear and tear, problems can occur. Most lift tables use electromechanical switches to detect when the top and bottom lifting position is reached.

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