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In these cases, a broken cable or similar fault has probably prevented the lift table from lowering. To test the functionality of this safety device, some lift table manufacturers equip their hydraulic system with a "bypass" line. After the speed slows down, first consider the factor of hydraulic oil flow. Minor dirt particles can be removed by simply flushing the valve. Added to these are scissor lift tables which are specially manufactured according to customer requirements. The hydraulic pipeline may be blocked. If necessary, a reset button must also be pressed to enable the lift table to move again. If the electric motor does not run, another reason could be that the motor windings have worn out and the motor may need to be replaced. A soiled lowering valve would have the same effect as a soiled check valve. The power unit may not be running on three phases, but only on two. Adjust the valve if the pressure does not read 2500-2550 PSI. Tighten the line fittings or replace them. 2009-02-17T16:22:16-10:00 |oI6T;D%Wrb)*4('t#B% q-M\sstw~'}g4Na^: "ulJ"3- LKR2} ?- "_w}Qz_y7/?/zgyy(FeU YrVVAgPTgwuE^lmM7]:i` y:4@f{[pxN_tPt*E>Qx.5PGcBCH: 8:@q&-[mnSr{?^:`eeuQ */Jv3WWPTm4b,52kHl6jAU'lBe 0_Ll8M iL Gpur! It keeps the lift table in the current position when the hydraulic pump of the drive is turned off. He wrote and directed the film After The Rain as well as the play Soweto's Burning. He is a member of the Writers Guild Of America, the Screen Actors Guild and the American Federation of Television and Radio Artists. The solution is the same as the procedure described above. If there is a problem, clean or replace the hydraulic valve in time. In addition, the operating instructions of the lift table manufacturer, all applicable safety regulations and last but not least common sense must be used in all activities. At least one check valve is installed in the hydraulic system of the lift table. Check the setting of the relief valve if the lift, tilt or rotation is too slow. The equipment has landed safely, this is the customer needs to verify whether the tonnage, size, parameters, accessories, etc. A resulting loose contact acts like a short-term actuation of the safety edge for the control system. This applies in particular to work on the electrical system. 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. If this does not succeed, the check valve must be removed and cleaned. Mit Nutzung dieser Seite akzeptieren Sie Cookies. If the cylinders remain extended for a long time, there is a risk that the piston rods will dry out. You risk losing the manufacturer's warranty by making any changes or modifications. This fault is usually not easy to fix. Check the phases at the electrical connection of the electric motor and replace them if necessary. Julie Hoskins Make sure not to overtighten screw connections on hoses. Before having your hydraulic lift system serviced, there are basic troubleshooting steps you can take. The last option is to replace the valve. An open emergency release valve thus leads to a lowering platform. After loading is completed, check whether all is installed and whether there is Forgotten and missing accessories and other materials. If the lift is chattering or vibrating, it could mean that the sheaves or pins are wearing out. A lack of oil can almost certainly be ruled out if the lift table has been subjected to a professional final inspection and shipped properly. Hydraulic oil would enter the tank from the cylinders and the lift platform would lower. Lift tables are usually tested extensively by the manufacturer before delivery, so that the fault described here rarely occurs. This is connected to the control system in such a way that the lowering and lifting movement of the platform is blocked when a programmed pressure is exceeded. Check valves are used to prevent the oil flow in one direction. Please note that you should not simply replace the blown fuse with a larger one. 3 Types of Mobile Scissor Lifts From MORN LIFT: Which One is Best Suitable for Your Business? It goes without saying that the maximum duty cycle and the manufacturer's specifications must be observed. Please note that this usually does not affect the control voltage of the lift table. To put the lift table back into operation, it is sufficient to unlock all emergency stop switches. The hydraulic oil is compressed, the volume of the oil is reduced and therefore the cylinders do not extend as much as they would without a load (with a constant quantity of oil). Factors affecting the flow of hydraulic oil include: hydraulic pipelines, hydraulic valves, hydraulic oil pumps, motor speed control devices, etc.3. So if you hear a noise coming from somewhere around the scissor pin, the non-locating bearing or the fixed bearing of the lift table, this could indicate a defective bearing. Then top up the hydraulic oil. uuid:d1670e85-1494-43d9-801a-05b774a8562e Unfortunately, it is not possible to give a general recommendation of how often cleaning must be carried out, as this depends primarily on the on-site operating conditions. As a rule, you may not make any mechanical/electrical modifications to the lift table. If the safety edge is not blocked by some or other object, and that it got caught can also be ruled out as the cause, the electrical connection of the safety edge must be checked. Check for a clogged exhaust muffler if the lift lowers too slowly. Technical equipment can malfunction. If your hydraulic cylinders have a bleed screw, you can easily open it and move the lift table to its top end stop (disconnect limit switches). This means it should be checked on the valve connector whether the control voltage is applied to the contacts when the lowering button is pressed. This means that although, for example, a built-in programmable logic controller or existing relays continue to be supplied with power, it is possible that the electric motor is not supplied with power. The slower lifting speed inevitably leads to a longer running time of the power unit. Make absolutely sure that the pipes to be opened are depressurised. If the hydraulic lines have been laid correctly, a leak directly on the hydraulic unit or on the cylinders (damaged seals) is most likely. First check the oil level of the lift table. The hydraulic system must be bled. Most lift tables use electromechanical switches to detect when the top and bottom lifting position is reached. So a fault of the drive unit can be excluded as a cause. If an overload can be ruled out, the only remaining problem is unfortunately a defective hydraulic pump. 1998-11-09T11:53:25Z The hydraulic pipeline is also a very important link. In the event of damage, the flow is closed by means of a spring retainer so that the cylinders cannot retract any further. To arrive at the customer site, the customers on-site cooperation is required, such as forklifts, labor, etc., and the plant personnel should also guide when unloading the equipment to prevent accidents from slipping and causing equipment losses. 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. Due to the transport of the lift tables, it is possible that the switches are no longer in the planned positions. Whenever the cylinders of the lift table lose oil, this manifests itself in an unintentional downward movement of the lift table platform. The longer the running time, the higher the thermal energy introduced. This could damage the hose. If it does not, replace the bulb. The "sliders" are the poles that the lift gate runs up and down. To do this, move the lift table to the desired end position and move the limit switch until you hear the switching operation. Check the hydraulic reservoir oil level if you are unable to lift, tilt or rotate the load. Watch the HYDRAULIC FILTER indicator light on the instrument panel. This means that you should first try to flush the valve by repeatedly lifting and lowering. This means that although you can hear the hydraulic motor being actuated and started, the lift table does not lift. The result is hydraulic oil flowing back into the tank and the platform lowering. Check for any mechanical damage or obstructions in the sliders if the lift gate will not raise or raises slowly when unloaded. If electrical power is not required, the lift table should be disconnected from the power supply. H*T0T0 BCcK3=c`f P4/L.L.B3/\NxS3Dsd|@^. , 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, there is a pressure relief valve in the pressure line of hydraulic lift tables. 114 0 obj <> endobj 141 0 obj <>stream The same applies to personal injury and other damage. The hydraulic connection on cylinders without a bleed screw must be loosened slightly. 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 power unit is excessively noisy, sometimes changing out the old oil with fresh oil will solve the problem. Voltage fluctuations on the mains side may be the cause. Troubleshooting this fault is also similar to the procedure for problems with the check valve. If the supply line can be excluded as the cause of the fault, the next step is to test the solenoid coil of the valve. If the solenoid coil can also be ruled out as the cause of the fault, the only option left is to replace the lowering valve. Ross Glyn began writing for film and television in 1986. Check the lift table settings if overloading of the lift table is not the cause. For more detailed information, refer to the instruction manual of the lift table or the technical data of the power unit. This fault can occur if one of the following activities has been carried out recently: Pipe rupture safety valves react to a pressure difference between the supply line and the lifting cylinders. If the electric motor of the hydraulic unit turns in the wrong direction, no oil is pumped from the tank into the cylinders. application/pdf It is dangerous to simply set the overflow valve. This means the lubricating film that ensures the smooth retraction of the cylinders is missing. To check this, it is usually necessary to dismantle part of the power unit. The hydraulic connection on cylinders without bleed screws must be loosened slightly. You can quickly eliminate or rule out this source of the fault by disconnecting the valve connector of the lowering valve. To find the solution to your problem, simply select the appropriate heading in the following section. If it is not lit, turn the engine off and move the IGNITION switch to the LAMP TEST position to see if the HYDRAULIC FILTER indicator comes on. If the lowering valve is open and the built-in throttle lets less oil through than the pump can deliver, this will result in a low lifting speed. A pressure relief valve can only protect a lift table from overload during lifting. If the lift table is brand new or if work has been carried out on the electrical connection, you may be lucky. 2009-02-17T16:22:16-10:00 For example, the cause can also be that safety edge got caught. Clean or replace the muffler. As soon as no more air pockets can be detected in the hydraulic oil, the hydraulic screw connection can be tightened again. 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. Make sure that all cylinders are fully retracted. Of course, overloading is not the only cause of a malfunction. The escaping hydraulic oil must be collected with a cloth. You will find a list of possible causes under each heading. In most cases, the limit switches are installed in such a way that the end positions can be set flexibly. This article provides some assistance in identifying frequent faults that you can eliminate yourself without much effort and expense. 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. This raises the question of whether the volume flow of the pump has been reduced by a defect or whether part of the volume flow is flowing back into the tank. Lift tables usually have a surrounding safety edge to prevent objects or limbs from being trapped between the platform and the base frame of the lift table.If the safety edge is activated, the lift table can no longer be lowered any further and the platform can only be raised. tork.pdf Dangers arise in particular from the possibility of the hose rupturing. If the cause of the uneven downward movement lies, for example, in a dirty bearing surface, this often goes unnoticed during lifting due to the force of the cylinder. To prevent uncontrolled downward movement of the lift table platform, the cylinders are usually equipped with a pipe rupture safety valve. This prevents the hydraulic oil under pressure to flow from the cylinders via the pump back into the tank. If pressure is now applied to the cylinder, some oil will escape. Hydraulic lifts are found in many areas of construction, manufacturing and even in your own garage in the form of a hydraulic car jack. Use your common sense when troubleshooting and do not take unnecessary risks. Its function is to prevent the hydraulic system pressure from being too high and to protect the hydraulic system settings. For this reason, it is recommended to first measure the control voltage on the valve. Forklift and crane loading and unloading must be smoothly transitioned. A very high flow rate acts like a defect in the supply line for the pipe rupture safety valve. It connects the pressure line directly to the hydraulic tank. 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. If you can hear a slight 'bubbling sound, this indicates air in the hydraulic system. Janzen Lifttechnik GmbH| Rudolf-Diesel-Str. Depending on where the noise comes from, the following causes of the fault are likely: Most lift tables are equipped with maintenance-free plain bearings. Replace the hydraulic oil if necessary. To prevent this, manufacturers usually prescribe regular cleaning of the lift table and especially of the running surfaces. Air in hydraulic systems regularly causes problems, as it allows the load to move in an uncontrolled movement manner. Solution: It must be ensured that the hydraulic system is properly bled to prevent this undesirable effect. endstream endobj 122 0 obj <>>>>> endobj 63 0 obj <> endobj 11 0 obj <> endobj 64 0 obj <> endobj 120 0 obj <> endobj 84 0 obj <> endobj 87 0 obj <> endobj 92 0 obj <> endobj 95 0 obj <> endobj 98 0 obj <> endobj 116 0 obj <> endobj 119 0 obj <>stream An electronic pressure switch is often installed when the lift table can be loaded and unloaded on several landings. Why Hydraulic Car Scissor Lift is Welcomed by Automobile 4S Stores? Hydraulic lift technology is renowned for its sturdiness and durability, yet after much wear and tear, problems can occur. The ball valve must be closed. Check whether the hydraulic pipeline is unblocked. The lift table manufacturer most probably have something in mind when designing the fuse and you would risk at least one defect in the components, or in the worst case even cause a fire. The heating of the hydraulic oil can in turn lead to a defect in the installed hydraulic components. General safety instructions are listed at the end of this article. If the pressure in the oil cylinder or the oil pipe is too high, serious failures of blasting may occur. endstream endobj 117 0 obj <>/ProcSet[/PDF/ImageB]>> endobj 118 0 obj <>]/Height 1700/Type/XObject/Decode[0 1]>>stream Make sure that all cylinders are fully retracted and that the maximum fill level is not exceeded. Hydraulic pumps that have been used for too long are also prone to problems. Due to the greater compressibility, the change in volume at the same pressure is much greater and the load drops noticeably. Very often the cause is simply that the lift table is overloaded. A leak in the hydraulic line or incorrectly tightened connections can cause hydraulic oil to escape from the pressure line. A replacement is inevitable. The operating instructions supplied with the lift table will usually contain the relevant information. Check the hydraulic system for leaks, focusing on the connections of hydraulic pipes and joints, cylinders, and hydraulic valves. Fill the reservoir with oil so that it is between the FULL and ADD marks. The compressibility of air is significantly higher than that of hydraulic oil. Start the engine and move the controls when the hydraulic oil reservoir is full. These are the seals that hold in the hydraulic oil and create the pressure that operates the lift. The lowering valve is another valve that could cause the described problem. If air enters the hydraulic system several times during the lifting process, this process is repeated accordingly and is perceived as jerking. In the worst case, the valve must be replaced. Nevertheless, it is possible that the cylinder seals on some lift tables are still very tight and consequently offer increased resistance during retraction. xIFkM*P .ed%#-mz-ZjM@/r0(ijC|[3 If the oscillations are particularly strong or if vibrations occur during the entire lifting movement, this will indicate a malfunction. QuarkXPress: PSPrinter 8.3.1 Even more common than jerky lifting is jerky lowering of the lift table. To rectify this fault, you must raise the lift platform again to open the pipe rupture safety valves. If the lift table is overloaded, the weight must simply be reduced or removed. Hydraulic pump is also an important factor affecting hydraulic oil flow. Make absolutely sure that the line cannot rip off the cylinder when the hydraulic line is loosened. worn. For this reason, the lowering movement of the lift table is stopped. As a rule, you should leave this work to the lift table manufacturer. Please remember that the maintenance support struts must be inserted for all work underneath the platform. If the pressure is lower than the normal range, the overflow valve setting value can be adjusted. The flow-through opening is usually closed by a combination of ball, spring and ball seat. Click on the link for more information. Often, however, it is not the hydraulic valve itself that is defective, but the solenoid coil or the supply line of the valve. Another frequent fault is that the platform of the lift table can no longer be lowered. Therefore it is unfortunately not possible to provide generally applicable step-by-step instructions. It is obvious that a lift table for 500 kg is not designed to carry the same load as a lift table for 1,000 kg. Dirt on the running surface of the roller bearing can prevent the non-locating bearing roller from running smoothly. Replace the hydraulic oil filter if the HYDRAULIC FILTER light remains lit. The above is the knowledge of freight elevator transportation and loading and unloading, I hope it will be useful to everyone. All hydraulic cylinders must be fully retracted. Depending on the service life, the individual bearings of the lift table may have to be regreased or, in the case of non-greasable bearings, completely replaced. Check all the lines and hoses for any leaks or damage if the lift lowers too quickly. However, this means that the solutions listed here cannot be applied to all hydraulic lift tables. Always follow the instructions of the lift table manufacturer regardless of the kind of work being done on the lift table. This means, for example, that a scissor lift with single-acting cylinders is used. Unfortunately, a defective cylinder seal must be replaced, which can usually only be done by the manufacturer of the hydraulic cylinder. When the speed of the hydraulic lifting platform slows down, check whether the oil supply flow of the hydraulic pump is stable. If the lift table initially had enough hydraulic oil to lift the platform, the oil must have leaked somewhere. Both manifest themselves in an uneven lifting or lowering process. If you can see oil leaking around the connections, it is sufficient to retighten the corresponding screw connection. Some lift tables are equipped with an emergency release valve. As with all faults, it is important to question why it has occurred. Ross holds a performer's degree from the London Academy of Music and Dramatic Art. The cause of this fault is generally very easy to find. %PDF-1.6 % The hydraulic system pressure should be checked only when the guide rail elevator cannot be started with load. The overflow valve is generally placed inside the pump station with an adjustment valve on one side. 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. Otherwise youre in for a nasty surprise the next time you retract the hydraulic cylinders (the hydraulic tank would overflow). Bleeding the hydraulic system has already been described several times. 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. However, if air gets into the hydraulic system, it is also compressed by the pressure and the volume is reduced. The causes of faults and solutions listed here are limited to a hydraulic scissor lift table with a commercially available structure. 3| D-49779 Niederlangen| +49 (0) 5939/967 96 90| info@j-lifte.com, Vermeidbare Fehler in der Projektausfhrung. TWq&l>A}H ="oi(T? If the coupling is not damaged, the hydraulic pump may need to be replaced. As a result, the valve cannot be opened via the built-in solenoid coil and the lift table remains in its current position.Unlocking all emergency stop switches is sufficient to rectify this fault.