What is high-pressure diaphragm plunger pump ? First, let us know the PUMP CLASSIFICATION: Diaphragm pump or plunger pump belong to reciprocating pump of one kind of positive displacement pump. High-Prussure Single-Diaphragm Plunger Pump High-Pressure Diaphragm Plunger Pump combines the characteristics of the diaphragm pump and the plunger pump, it can transfer mixture materials of 50% of the solid & liquid (solid diameter ≤1.5mm) by high pressure. Product type Product performance Single plunger diaphragm pump Plunger pump Diaphragm pump solid & liquid mixture materials transported by high pressure Pressure: 0-80 kg（0-8Mpa） √ ╳ ╳ liquid material transported by high pressure Pressure: 20 kg - 2000 kg (2-200Mpa) √ √ ╳ solid material transported by low pressure Pressure: ≤6 kg (0.6mpa) √ ╳ √ Working Principle: (1) By the eccentric wheel (no. 1) rotates, three plungers (no.2) are alternately pushed. (2) The plungers push three diaphragm by turns (no. 3). (3) The diaphragms exert pressure to the liquid. (4) The valve plates and valve seats (no. 4 and no. 5) of the pump make same function as one-way valve, making open-close working condition, and make liquid enter, press and discharge from pump. Upgraded Pump Technology ! ! High-Pressure Double-Diaphragm Plunger Pump (1) High-pressure double-diaphragm plunger pump equipped with automatic diaphragm broken detector and alarm devices. (2) If diaphragm broken, the pump stopped working immediately, and will not damage pump by entering materials into transmission assembly. (3) Double-diaphragm plunger pump avoid oil leakage during replacement and disassembly. Product type double diaphragm plunger pump single diaphragm plunger pump plunger pump diaphragm pump Product performance solid & liquid mixture materials transported by high pressure Pressure: 0-80 kg（0-8Mpa） √ √ ╳ ╳ liquid material transported by high pressure Pressure: 20 kg - 2000 kg (2-200Mpa) √ √ √ ╳ solid material transported by low pressure Pressure: ≤6 kg (0.6mpa) √ √ ╳ √ if diaphragm broken, the sensor sends stop-signal and avoid materials entering into transmission assembly. √ ╳ ╳ ╳ High-pressure diaphragm plunger pump are widely used in general industrial, chemical, petrochemical, machine tool coolant, marine, oil & gas, painting & coating, paper & pulp, pharmaceutical, food & drink, environmental control, polyurethane foam, power generation, reverse osmosis, spray drying, steam generation, steel industry, vehicle washing, water and waste treatment.https://www.sino-cem.com/industrial-pump/http://www.henglida-china.com/faqid100353/Industrial-Pump.htm
Five reasons for the Oil into the waterExcavator oil entering the water will cause the engine crankshaft, connecting rod and other important components to deform, causing the engine to shake, and the heavy one will cause the component to break and the engine to be scrapped. So what causes the engine to enter the water?1, engine water plugging water leakageDue to the corrosion of scale, the water will rust and the cooling water will enter the oil passage from the waterway to the oil sump. This is a common cause, so check the water block frequently.2, the oil radiator is damagedThe radiator pipe is damaged, and the water outside the radiator will penetrate into the oil radiator, causing the oil to enter the water.3, the cylinder liner crackWhen the cooling water comes into contact with the working cylinder liner, cracks are easily generated. Once the crack occurs, the cooling water will directly enter the cylinder and enter the oil sump through the cylinder wall, which will make the oil white and the oil will turn white. It can cause problems such as poor engine burning and white smoke. Under normal circumstances, the cylinder liner is not prone to cracks, but in some cases, for example, the winter cooling water is not filled with antifreeze to cause icing, which may cause cracks in the cylinder liner.4, the cylinder liner seal is damagedDamage to the cylinder seal is a common cause of oil ingress, so be sure to check that the cylinder seal is intact when troubleshooting the cause.5, the cylinder head gasket is damagedIf the cylinder head gasket is damaged, the water circulation speed is fast, and the water in the water channel will flow into the oil oil passage, causing the oil to enter the water. Cylinder gasket damage is also one of the common causes of oil ingress. After each disassembly of the machine, try to use a new cylinder head gasket to avoid leakage of water from the cylinder gasket and cause engine damage.Four methods for judging oil inflow1. Observe the appearance of the oil of the digging machine. It is easy to judge whether the oil contains moisture by the color. Oils that do not contain water are translucent oily, while oils that contain water exhibit opaque brown or earthy yellow.2. Check if the oil in the excavator coolant contains oil. If some parts of the engine are damaged, the engine coolant will enter the lubrication system and the oil will be mixed together. The infiltrated oil will also be found in the tank coolant and can be easily identified.3. If the engine oil enters the water, it will chemically react with the coolant in a high temperature environment to form an emulsion. Checking the dipstick will reveal a white color with foam.4. When the oil of the excavator contains a lot of water, the oil level of the oil will rise. At this point, we can simply judge the level of the oil level. Digging machine oil water failure We can judge whether the oil is in the water by several aspects such as the appearance color of the oil, the oil level of the oil, and the observation of the oil coolant. When encountering engine water, do not start the engine twice, you need a professional maintenance worker to clean the internal water of the engine, then from the oil radiator, water block, cylinder seal, cylinder liner, cylinder gasket, etc. Check to determine the cause of the oil entering the water.
6 things that excavator novice must knowWhether it is a novice who has just entered the line, or an old driver who has been working for many years, before the hydraulic excavator is opened, sufficient preparations must be made to ensure the safety of the operation and make the excavator use longer. What do you need to do before the excavator work?1.First of all, you should understand the environment of your workplace and ensure it is safe. Carefully check the solidity of the soil where the excavator is parked. According to different operations, it is necessary to observe the slope and wire height of the work site, underground cables, various pipes and surrounding obstacles in advance to ensure the safety of the work area. Open the excavator to work.2.Before the operation of the excavator, to ensure the safety of the surrounding people, irrelevant personnel must not stay in the excavator working area, and prohibit unrelated personnel from entering the cab. It is important to note that after the engine is started, no one should stand on the inside of the bucket, on the boom, on the track and on the shed, and that safety should be placed first.3.Before the work, the daily inspection and maintenance should not be less. Check whether the oil, coolant and hydraulic oil of the excavator are sufficient.When it is insufficient, it is necessary to raise it in time. Please pay attention to avoid smoking when filling the fuel to avoid fire.4.Excavator hydraulic system inspection work, observe whether the hydraulic pipeline, operating valve, hydraulic cylinder, oil pump, etc. have leakage phenomenon, if necessary, timely treatment to prevent potential safety hazards.5.There are many inspection items before operation, such as checking and adjusting the reverse tension of the track, checking the liquid level of the front window cleaning liquid, checking the cleaning air filter, checking the rotating structure, the instrument, the working device, etc., confirming that the excavator is normal. Work again.6. Start and prepare the engine. It is best to start the small throttle first, and the small oil will be turned off. Do not suddenly turn off after the high speed.Generally, the optimal working water temperature of the engine is 90-95 °C, and the optimal working temperature of the hydraulic oil is 55-. At 85 ° C,remember not to run the excavator at low or overload.
How to open the excavator to save fuel?Excavators know that in addition to themaintenance of the machine, the daily work cost is the main thing is to burnthe oil. Since the fuel consumption can not be avoided, it is necessary to workharder from fuel saving, how can it not reduce the working efficiency and themechanical service life? Under the premise of saving a lot of oil money, Ibelieve this is the most concerned issue of the majority of the owners of the machine.Here are some fuel-saving tips for digging operations.The first point, the high position miningloadingWhen loading the excavator, if possible, ifit is conditional, it should be in a higher position. If there is no conditionto create conditions, it should stand at a high position, so that the truck isparked at the same height as the working surface; the reason is very simple, astone, you lift to the knee and lift Is it the same as the one used above? Howmuch "strength" can you save? Compared with the direct low-levelexcavation, the cycle time can be shortened by about 12%, and the fuelconsumption of about 8% can be reduced, and the work efficiency of about 40%can be improved, which is not a small number.Second, when the bucket cylinder and theconnecting rod, the head cylinder and the head are both 90°, each cylinderpushes the excavator to the maximum.The third point is that the excavation ofthe natural ground, the bucket or ripper floor angle is maintained at around 30°, the grab bar. When the stick is close to vertical, the stick force is thelargest and can carry more load. These two points are like you are bending yourarms to lift things, or just straighten your arms, of course, bent.Fourth, when performing the trenchingoperation, first dig the sides of the trench and then dig the middle part. Thiscan save a lot of things when you dig in the middle, but also save energy.The fifth point, the smaller the excavationdepth, the better the economical shape when excavating, and try to use themethod of segmentation mining. Divided into upper, middle and lower three-layerexcavation. If it is from low to top, the scope of action is increased first.Secondly, the excavator's power is reduced because of the increased range,which reduces the work efficiency, which requires a lot of oil.These tips for fuel-saving operation maynot even be noticed by the old operators, but as long as they can develop goodoperating habits, they can save considerable fuel costs.
What if the excavator loses the chain? Two strokes to easily install the trackExcavators often have chains that fall out of the work, that is, the crawler belts fall off, especially for machines that are older, and the chain is more common. In this case, experienced drivers will reinstall in a short period of time without affecting productivity, but for some novices, this can become a big problem.So what happens after the excavator drops the chain? Don't be afraid, as long as you will dig the machine, it will be easy to handle.Preparation is essential1. Try to choose a spacious, flat and hard site to maintain a certain range of rotation and walking.2. Determine the degree of excavation of the excavator. If it is caused by the breakage of the object or other faults, the repairer should be notified in time for repair.3. Check for dirt and sand in the excavator's track and clean it in time.4. Using a wrench or a sleeve, remove the track oil-filled grease nipple, use the excavator bucket to prop up the crawler off the side and turn the track. The butter will follow and the drive wheel will retract.Mounting Track Tips 1When one side of the track is detached, the drive wheels are docked first, the upper track is hooked up by the bucket, and the drive wheels are aligned and enter the inside of the track. The vehicle is adjusted to align the drive teeth with iron bars, etc., and the upper tug is aligned. This step has been completed by a third.Hold the machine to unilaterally walk to make the track straight, once again support the machine and get off the vehicle to adjust the lower track, try to make the track fall after the track is aligned with the track (this is a step that is easy for you to ignore), and this step has been completed three Divided into two. Simply use the bucket to gently lift the excavator and lift the track with the bucket teeth, so that the guide wheel enters the track. Then, adjust the track alignment guide wheel, then turn the track and add the butter. Then the track is assembled. Mounting Track Tips 2Turn the chain joint pin to the middle height of both ends and knock it out. At this time, the track plate can be placed flat and in a shape of a line. The excavator travels unilaterally to the top of the track. At this time we need an iron rod to "guide" the track shoes to the "right track." Starting from the driving wheel, placing the iron bar under the track shoe and propping up the machine to rotate the track. At this time, one person needs to walk in the cab, while lifting the track while lifting the track, go through the upper roller and walk to At the position of the guide wheel, an object can be placed at the guide wheel. At this time, the two sides of the track are butted together, and the live pin can be assembled. This method is also suitable for rubber track assembly. Due to the aging of the live pin, the tapping is difficult and even the welding and cutting equipment is required to assemble. Therefore, this method is generally not recommended.
Excavator rotation function detection Hydraulic excavator is akind of multi-functional machine. It is widely used in hydraulic engineering,transportation, electric power engineering and mining and other mechanicalconstruction. It is reducing the heavy manual labor and ensuring the quality ofthe project. Speeding up construction and increasing labor productivity play avery important role. Because hydraulic excavators are characterized by manyvarieties, versatility, high quality and high efficiency, they are favored bythe majority of construction units. The manufacturing industry of hydraulicexcavators is also booming. First, thepreparation work: 1. Check thelubrication of the slewing gear and the slewing bearing. 2. Park theexcavator on a flat, sturdy ground with sufficient swing space. Do not do thischeck on the slope. 3. Extend the armand the bucket is turned in to maintain the height of the bucket, that is, theconnecting pin of the bucket and the foot pin at the lower end of the boom arekept at the same height. The bucket must be empty. 4. Keep thetemperature of the hydraulic oil at 50±5°C (122±90F) ▲Note:To prevent personal injury. Be sure to clean the site before starting themeasurement, and the people involved in the work should leave the swing area. Second,measurement: 1. Select thelocation of each of the following switches: Engine controldial: maximum position E mode switch: OFF HP mode switch: OFF Work mode selector:general purpose mode Auto-slow switch:OFF 2. Push the swinglever to the full stroke. 3. Measure the timerequired to turn 3 turns in the same direction. 4. Repeat steps 2to 4 3 times and calculate the average value. 5. Push the swivellever all the way to the opposite direction and measure the time required tomake 3 turns. Third, theinspection of the swing function drift measuring: 1. Select thelocation of each of the following switches: Engine controldial: maximum position E mode switch: OFF HP mode switch: OFF Work mode selector:general purpose mode Automatic one slowswitch: OFF 2. Measure thedistance between the two marks. 3. Realign the markand turn 180. , check the opposite direction. 4. Repeat steps 3through 5 three times each and calculate the average value. 5.Push the swing lever to the full stroke and turn 180. When the mark of theupper swing platform is aligned with the mark on the track stand, the controllever is returned to the neutral position.
The reasonand solution of the arm loss of excavator Excavatorsoften have big and small problems, and it is really a headache! I don't know ifyou have encountered the excavator's arm. Why doexcavators lose their arms? How to solve the problem of arm failure?What is anexcavator losing its armExcavatorarm also known as the boom, since the fall, fall pump and so on. Simply put,the arm is actually a performance of mining arm weakness, when the arm lift, inthe case of no control of the operating lever, the big arm or small arm willappear automatic fall phenomenon. When the excavator has arm failure, it willalso have different manifestations. The failure phenomenon can be roughlydivided into big arm failure, small arm failure, middle arm failure, normal hotcar arm failure and so on.7 commoncauses of arm failure:1. Armloss caused by hydraulic oil fault. Cold car normal hot car arm, is likely tobe hydraulic oil problems.2. Thehydraulic cylinder of the excavator breaks down, especially the oil seal isdamaged or aging, which causes the leakage of the oil seal.3. Distributingvalve valve hole blockage, spool wear, excessive spool clearance, distributionvalve main safety valve wear and damage, caused by the large and small armboom.4. Whenthe oil seal of the safety overflow valve of the big and small arms is damaged,it will cause certain leakage and also lead to the phenomenon of arm loss.5. Thedistribution pump seal is not good, also known as "unloading", thenneed to be the distribution pump sealing ring replacement.6hydraulic pump proportional solenoid valve joint contact is not good, can alsocause the big arm arm phenomenon.7. Severedrop arm (oil temperature 45 ℃ or so, 5 minutes buckettooth fell by more than 95 mm), is most likely the result of the main valvestuck.Whatshould do if lose the arm of the excavator?1. Checkthe operating environment temperature of the excavator, whether there isimproper selection of hydraulic oil model, and whether inferior hydraulic oilis used.2. In caseof arm failure, the pressure of the moving arm can be reduced first, andcarefully observe whether the moving arm falls down quickly.3. Checkwhether there is any fault in the hydraulic cylinder and oil seal of thecylinder. If the oil seal is defective, it will leak oil.4. Afterreplacing the oil seal, if the arm is returned, check the distribution valveand the arm oil return valve, etc.5. Checkwhether the working pressure and pilot pressure of the main hydraulic pump ofthe excavator meet the requirements.
Main use of the excavatorThe excavator occupies aconsiderable proportion in engineering vehicles. It is the main equipment forearth and stone excavation. It is used in industrial and civil construction,mining, water conservancy and electric power construction, transportation,agricultural machinery engineering, oilfield construction, port constructionand military engineering construction. There are a wide range of applicationsin all types of projects. According to statistics, about 60% of the earth andstone volume in the construction of the project is done by hydraulicexcavators. Excavators areavailable in both mechanical and hydraulic versions. With the development ofhydraulic transmission technology and the improvement of the quality ofhydraulic components and the cost reduction, China's hydraulic excavators havedeveloped rapidly. In the 1980s, in the application of small, medium and evenlarge excavators, hydraulic excavators almost replaced the backward, bulkymechanical excavators, which are made up of ten hydraulic excavators with lightweight, small size and structure. Compact, smooth transmission, simpleoperation, and easy to achieve a series of advantages such as stepless speedchange and automatic gripping. 【The main uses】 1. Road and BridgeConstruction Company: engaged in road construction, bridge construction, tunnelexcavation, large bridge construction 2. Municipalconstruction company: engaged in laying natural gas, pipelines, water pipes,sewage pipes, old town reconstruction, new city development, high-risebuildings, rural construction and renovation 3. Energymetallurgy, hydropower station construction, coal mine development buildingmaterials and oil and gas pipeline laying and other projects. 4. Waterconservancy construction, dredging and dredging, cofferdam filling, manualdigging lake
Forkliftwork safety requirements1.There shall be no deformation or weld seam de-welding. The rolling clearancebetween the inner and outer gantry shall be adjusted reasonably. It shall notbe greater than 1.5mm. The rotation of the roller shall be flexible. The rollerand shaft shall be free from cracks and defects. The amount of wheel groovewear must not exceed 10% of the original size.2.The tension of the two lifting chains should be uniform, not to be distorted,the ends are firmly connected, and the pitch of the chain must not exceed 4% ofthe original length, otherwise the chain should be replaced. The sprocketrotation should be flexible.3.The forks shall not be severely deformed and the welds shall be desoldered.There must be no cracks or welds on the surface of the fork. The root angle ofthe fork shall not be greater than 93° and the thickness shall not be less than90% of the original size. The height difference between the left and right forktips shall not exceed 3% of the length of the horizontal section of the fork.The positioning of the fork should be reliable. The bearing surface and thepositioning surface of the fork should not have obvious defects. The clearancebetween the fork and the fork should not be too large and the movement shouldbe smooth.4.The connection between the lifting cylinder and the door frame should be firm.The hinge of the tilting cylinder and the door frame and the frame should befirm and flexible, and the matching clearance should not be too large. Thecylinder should be well sealed, free of cracks and stable. Under the ratedload, the self-sinking of the gantry is not more than 20mm and the inclinationis not more than 0.5°. The lifting speed should not be less than half of thestandard value at full load.5.The overhead guard and the shelf must be complete and effective.6.It is strictly forbidden to stand up and down the forks. It is not allowed touse a single fork to take goods with high load.7. Aforklift driver equipped with a forklift driver's license to avoid multipledrivers on one forklift.
Winter hydraulic excavator driving requirementsExcavator hydraulic drives are closely linked and their development is based primarily on the application of hydraulic technology. Its structure is mainly composed of engine, hydraulic system, working device, walking device and electrical control. Due to the harsh working conditions of the excavator, the required action is very complicated, so it puts high requirements on the design of the hydraulic system. Its hydraulic system is also the most complex of engineering machinery hydraulic systems. Therefore, the analysis and design of the hydraulic system of the excavator has become an important part of promoting the excavator. Here are some things that the hydraulic excavator should pay attention to during driving. 1. When the excavator encounters electric wires, crossroads, bridges and culverts, understand the situation and then pass it. If necessary, set a special person to command; the distance between the excavator and the high-voltage electric wire shall not be less than 5m; 2. When the excavator is running, its boom should be parallel with the running mechanism, the turntable should be locked, and the bucket should be about 1m away from the ground. Low-speed gears should be used for downhill operation, and off-tracking is prohibited. 3. The excavator's walking route should be kept at a sufficient distance from the slope, ditches and foundation pits to ensure safety; when crossing the soft section, use a low-speed uniform speed, and if necessary, use wooden boards, stones, etc. to pave the way. 4. Excavator prohibits anyone from loading and unloading excavators and transferring items. It is not allowed to maintain while working; do not adjust the engine (speed governor) and hydraulic system and electronic control system at will; pay attention to selecting and creating reasonable On the working surface, it is strictly forbidden to dig holes. 5. When the excavator unloads, it should be carried out after the dump truck stops. When the unloading does not collide with any part of the dump truck, the bucket height should be lowered; the bucket is crossed from the top of the dump truck cab. 6. It is forbidden to use a bucket to crush a solid object; if it encounters a large stone or a hard object, it should be removed first and then continue to work; it is forbidden to excavate the rock of level 5 or above that has been blasted. 7. It is forbidden to arrange the excavator in the upper and lower excavation sections at the same time; when the excavator moves in the working plane, the ground should be leveled and the obstacles in the passage should be removed. 8. It is forbidden to jack up the excavator by fully extending the bucket cylinder. The excavator cannot travel horizontally or slewing when the bucket does not leave the ground. 9. It is forbidden to use the excavator boom to drag the object laterally; the hydraulic excavator cannot be excavated by the impact method. 10. When the excavator is making a swing motion, the reverse handle cannot be operated in the opposite direction. 11. The driver should always pay attention to the operation of the excavator. If abnormality is found, stop the vehicle immediately and check it out in time. 12. During the operation and operation of the excavator, always check whether the temperature of the hydraulic oil is normal.
How to maintain the long-term storage of construction machineryHow to properly storeconstruction machinery is an important knowledge that engineering machineryoperators should master. In particular, many construction machinery may not beused for a long time, or after a certain project is completed, these mechanicalequipment must be stored for a long time. At this time, how to get the correctlong-term storage of construction machinery and equipment becomes an importantissue. How to maintain the equipment during the storage period for a long time,so that they do not affect the future use? How to properly storeconstruction machinery:1. Park in a dry room. Ifyou have to stop outside, you should choose a flat floor and put wood. Cover itwith a cover after parking.2. Before long-termstorage, the machinery must be repaired, repaired and damaged, and thoroughlycleaned to maintain a good technical state.3. Arrangement andarrangement at the airport stoppage shall ensure that the entry and exit of anyone machine is not affected by other machinery.4. The mechanical fuelcontrol lever should be placed in the idle position, and each joystick shouldbe placed in the neutral position.Engine storage:1. Release the coolingwater from the engine.2. Replace the engineoil. The new engine oil is usually neutral and will not corrode the metal partsof the engine.3. Fill the fuel tankwith diesel to avoid rusting the fuel tank. Preservatives should also be addedif conditions permit.4. During the shutdownperiod, the engine should be started once a month to make the machine travelfor a short distance, so that a new oil film is formed in the lubrication partsof each part to prevent rust. It should be noted that the cooling water shouldbe filled before starting, and the cooling water should be drained at the end.Storage of batteries:1. The battery should beremoved and the battery placed in a dry and antifreeze. To keep the surfaceclean and dry, it is strictly forbidden to place conductive objects on thebattery. When disassembling the battery, first cut off the negative line andthen cut off the positive line; first connect the positive line and then thenegative line. Because the engineering machinery electrical system is anegative grounding, this is to prevent short circuit when disassembling thebattery.2. The lead-acid batteryshould be charged once a month.Anti-rust treatment:1. Before storage, itshould be determined according to the size of the area of the anti-rust paint onthe outer surface. It is determined by the method of repainting or repaintingwith the whole machine.2. The workingequipment of the construction machinery, such as the screed of the paver, thebucket of the loader, the scraper of the grader, etc., the rust preventionmethod of the bare metal is spread butter.
Source of hydraulic oilpollution from excavators 1. Ensure the quality of hydraulic components procurement In the procurementprocess of hydraulic system components, it is necessary to carefully check thequality of purchased parts such as pumps, valves, hydraulic cylinders andhigh-pressure hoses; during the transportation and storage process, the hydraulic ports of all components must be equipped with sealing plugs to prevent contamination. Intrusion. 2. Reasonableassembly Before assembly,all hydraulic components and accessories must be carefully cleaned; after cleaning, all the ports should be closed with plastic tape; the hydraulic components should be assembled using the “dry assembly” method, ie the partsafter cleaning should be dry after the surface is dry. If it is assembled, it is forbidden to use iron tools to strike. If you need to tap, you can use wooden hammer, rubber hammer or copper hammer; do not wear gloves whenassembling, and do not use fiber fabric to wipe the component mounting surfaceto prevent fiber. Class substances invade the valve; when the assembled hydraulic parts are not assembled, use plastic tape to block all ports. 3. Guarantee thequality of hydraulic oil Hydraulic oilshould be added according to the manufacturer's specifications, do notarbitrarily change the grade. The hydraulic oil must be sampled and inspectedat the factory. After the inspection, it must be filtered before it can be injected into the fuel tank. Hydraulic oil should maintain a certain degree of cleanliness, usually with solid particle pollution level, moisture content,viscosity change, total acid value, etc. as the main test indicators. 4. Clean andreplace the oil filter in time The oil filter installed on the suction port of the hydraulic pump and the oilinlet of the important hydraulic components should be cleaned or replaced asscheduled to effectively remove the chips and large particles in the hydraulic oil to avoid the stuck, scratched and blocked hydraulic components. phenomenon.
What should do if the digging machine cylinder is discolored?The general process of discoloration of a hydraulic cylinder is like this: the cylinder first turns blue first, then the color gradually deepens, turns purple, and finally turns black. The discoloration of the cylinder is actually the surface of the oil covered with a layer of colored film, not a problem with the cylinder itself.Reasons and methods for discoloration of hydraulic cylinders:Reason 1: The temperature difference between the inside and outside of the hydraulic cylinder is too largeIf the temperature of the hydraulic system is too high during the work of the excavator, and the temperature of the external connection is very low, especially in the winter, the temperature difference between the inside and the outside of the cylinder will be very large, and the piston rod works in this case. It is easy to cause discoloration of the cylinder.Reason 2: Use non-dedicated hydraulic oil or poor quality hydraulic oilMany users have insufficient experience or cheap maps. When excavating machine maintenance and replacing hydraulic oil, hydraulic oils not used by this brand of excavator are used, which can easily cause discoloration of the cylinder. Because there is an extreme pressure anti-wear additive in the hydraulic oil, the additives contained in different brands of hydraulic oil are different. If mixed, it will affect the cylinder.Reason 3: Piston rods adhere to impuritiesWhen the hydraulic cylinder is working, the piston rod is often in contact with the outside world, and it is easy to adhere to some impurities. As the impurities accumulate, the cylinder will also change color. Among them, the blue color may be caused by the oil seal and the additive in the hydraulic oil adhering to the cylinder rod at a high temperature. Blackening may be due to the fact that the lead additive contained in the spray coating in the wear sleeve adheres to the cylinder rod at a high temperature.Reason 4: Poor electroplating process causes micro cracks on the surface of the piston rodAnother possibility is that there is a crack on the surface of the piston rod that is difficult for us to see with the naked eye. The reason for this crack is that the temperature of the piston rod is not uniform enough during the electroplating process. The cracks need to be seen with a high magnification magnifier. .Solution1. When the cylinder is found to be very fine and has a small area of blue, it can be temporarily left untreated. Most of the time, the blue color will disappear by itself.2. If the color change is serious, you need to replace the oil seal and wear sleeve. At the same time, you should avoid the high temperature of the hydraulic oil and return to normal after a period of time.3. When discoloration occurs in the front half of the bucket cylinder, the radiator should be cleaned to ensure the heat dissipation of the hydraulic system.4. If non-special hydraulic oil or inferior hydraulic oil is used to cause discoloration, it should be replaced immediately with the special hydraulic oil that is unified with the brand of the excavator.5. If the color changes due to cracking, this is a cylinder quality problem, you need to negotiate with the manufacturer or agent, or replace the piston rod.
How to do the loadermaintenanceThe engine is working properlyand the loader cannot walk First check thegearbox oil limit valve and shift pressure gauge. If it is found that thevariable speed torque oil is found, new oil should be added. However, it shouldnot be added too much, otherwise it will cause the gearbox to heat up,generally added to the limit valve to flow out of the oil. Then check if theboom can get up and down and if there is no steering. If the boom can be liftedand steered, the loader can't walk because the variable speed pump is damagedand the oil is not damaged. The boom cannot be lifted or steered, and theloader cannot travel. This is often the case where the steel plate connectionof the meat machine is broken by bolts or the elastic plate is broken. Thediesel engine and the gearbox must be lifted together, then the connecting partof the diesel engine of the torque converter must be removed, the damaged partshould be identified, and the damaged parts replaced or repaired.Can only move forward and notback First check if thepressure indicated by the shift pressure gauge is normal. If the reverse gearpressure is reduced, it proves that there is too much oil leakage in thereverse gear part. The gearbox must be lifted out and all unpacked forinspection. Remove the reverse piston, replace the piston ring, check thedamage of the friction plate, replace the friction plate with more seriouswear, and adjust the reverse gear gap to 1.6-2.6mm; if the reverse gear doesnot reduce pressure, it proves that the forward gear has The phenomenon ofdeath. If the reverse friction plate is slipped and the reverse gear cannot bedriven, the gearbox must be lifted and disassembled to check whether theisolation ring above the inner ring gear of the first gear is broken. Becausethe fragment can lock the first friction plate, the reverse friction plateslips and does not work, so that it can only advance and cannot retreat. Theisolation ring can be removed and replaced with a new one.Driven weak, stop when you stop 1) Check the oillimit valve next to the gearbox and add new oil when there is no oil. (2) If the oilquantity is normal, check the transmission pressure gauge. If the pressuregauge swings violently, it indicates that the oil supply is insufficient. Itcan be checked whether the oil inlet pipeline is blocked, whether the innerlayer of the hose is foamed due to aging, whether the torque converter filteris clean, and whether the filter element of the filter is clean. If this is thecase, clean and flush the blocked tubing and filter element multiple times witha compact loader until it is ready for use. The foamed hose will be replaced. (3) Observe thepresence or absence of metal blocks and aluminum chips on the filter screen. Ifthere is any damage to the torque converter and gearbox, it must be inspectedand replaced. Replace the damaged parts.The transmission pressure isnormal, neither the first gear nor the reverse gear can travel, only the secondgear can drive normally. Mostof the causes of such failures are direct shifting by not stepping on the brakepedal, and the first and reverse gears in the gearbox are twisted to preventthe power from being transmitted. The second gear is directly connected to thespline in the sun gear, and the power can be transmitted directly, so thesecond gear can drive.