The temperature of the hydraulic oil of Sany excavator is too high at 92 degrees, so ask for advice

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1. Reasonable selection of hydraulic oil.

1) Hydraulic oil viscosity (ISO VG, viscosity unit is mm2 s) The principle of determining the viscosity of hydraulic oil is to make the viscosity of hydraulic oil (used for components such as pumps and motors) in the optimal range under the premise of considering the working temperature and efficiency of the hydraulic circuit; Viscosity of a short cold start corresponding to the lowest ambient temperature; and the viscosity corresponding to the maximum allowable leakage of oil for a short period of time at 90.

2. Good hydraulic oil heat dissipation system.

For the improvement of the hydraulic oil cooling system of large hydraulic excavators (more precisely, the hydraulic oil temperature control system), although the specific methods adopted by each manufacturer are different, the basic idea is the same, which can not only balance the hydraulic oil temperature in a more ideal range in continuous operation, but also make the hydraulic system can quickly heat up (reach the normal working temperature range of the oil) when it is put into work in a cold state

3. Check the relevant hydraulic parameters in the system.

At present, there are two main control modes of the working pump of large hydraulic excavators: ultimate load adjustment with pressure cut-off function and load induction adjustment. The function of the ultimate load adjustment function is that when the working pressure of the system reaches the set value, the swash plate declination angle of the variable pump is reduced, so that the pump can only be kept in the "residual" flow state required to maintain the pressure, so as to avoid overheating caused by the overflow of the relief valve.

In order to achieve this, the system parameters are matched to make the ultimate load setting value lower than the setting value of the primary pressure valve in the circuit according to the technical requirements; Otherwise, opening of the primary pressure valve will result in overflow overheating. At the same time, check whether the proportional solenoid valve of the hydraulic pump is working normally, this work must be carried out in strict accordance with the standard requirements, and the relevant parameters of the system should be adjusted restoratively if necessary.

4. Eliminate abnormal internal leakage.

It mainly refers to the abnormal internal leakage caused by the seizure of the steering valve and pressure valve caused by the contamination of the hydraulic oil of the system. The method of inspection: measure the pressure, check the function, or listen to whether there is abnormal noise ("throttle scouring sound" caused by the valve port is not tightly closed) or touch to check whether the temperature is too high locally.

5. Prevent the volumetric efficiency of the component from decreasing.

Attention should be paid to both abnormal wear and tear. The former may occur in a very short period of time, which can be judged by checking the quality of the oil and combining the function of the system (such as whether the actuator is operating normally, whether the speed is decreasing, etc.); The latter should follow certain rules, should be comprehensively investigated, and measures should be taken in a timely manner.

You can troubleshoot and handle the problem in the following ways:

1. Hydraulic oil inspection

After the above work is checked normally, confirm whether the engine and the hydraulic system work match, there is no obvious overload phenomenon, check whether the quality of the hydraulic oil is qualified, and the hydraulic oil that is not up to standard will also lead to the phenomenon of excessive oil temperature rise due to insufficient oil density.

2. Hydraulic oil radiator inspection

If you confirm that the oil temperature is indeed too high, check the radiator for any debris blockage, usually the area between the hydraulic oil radiator and the water tank, if there is too much debris, please clean it first and then test.

3. Check whether the sensor is normal

When the oil temperature alarms, first confirm whether the oil temperature is really too high, you can use your hands close to the oil tank or oil cylinder (the temperature is too high can not be directly touched, in order to prevent burns), and slowly feel the temperature change around the oil cylinder.

Finally, if you can touch the oil cylinder, it means that the oil temperature is in the normal range, check the oil temperature sensor, remove the plug to see if there is still an alarm, if there is still an alarm, it means that the circuit or computer board or display screen is faulty and needs to be repaired, remove the oil temperature sensor and there is no alarm, then check the oil temperature sensor.

4. Isolation of hot air and cold air

If the fault persists, you can open the hood or side door to help dissipate heat, and when the temperature turns to normal, you need to check the isolation of the hot air area and the cold air area, whether the vent is leaking and whether the exhaust direction is affected.

When selecting the hydraulic oil used in hydraulic equipment, it should be comprehensively considered and judged from several aspects, such as working pressure, temperature, working environment, hydraulic system and component structure and material, and economy. Environmental factors include: aboveground, underground, indoor, wild, coastal, cold area, high temperature, and open fire.

The temperature of the hydraulic oil in the hydraulic system when it is working mainly requires the viscosity and thermal stability of the hydraulic oilOperating temperature -10-90 with L HH, L HL, L HM hydraulic oil, below -10 with L hv, l hs, working temperature 》90 Choose high-quality L HM, L HV, L HS.

The general relationship between ambient temperature and operating temperature is:Hydraulic equipment in the workshop, the normal working temperature is 15 25 higher than the ambient temperature; Hydraulic equipment in temperate outdoors, height 25 38; In tropical outdoor sunlight, 40 50 high.

The high oil temperature is similar to the high water temperature, there are also large and small circulations, but instead of passing through the thermostat, he has a return check valve, if this valve is stuck, the oil temperature will be high, and the other is the same as the water temperature.

Of course, the big excavator relies on the fan pump to drive the fan motor to adjust the speed, and there is an overflow device, the general oil temperature is high, and these places can be solved by checking.

1. Too high oil temperature is harmful to the engine.

The so-called high temperature of the engine means that the oil temperature and water temperature of the engine exceed 90.

When these two temperatures are too high at the same time, it will affect the normal operation of the engine and bring certain harm to the engine: the gap is reduced, and serious wear or "cylinder pulling" is formed.

The oil temperature mainly indicates the amount of heat produced compared to the amount of heat dissipated.

The crankshaft and bearing are heated by friction, and the oil dissipates most of its heat, and the balance between heat production and heat dissipation (manifested as a stable oil temperature) is relative.

When the heat production exceeds the heat dissipation, the bearing temperature will rise, and the local temperature will reach the melting point of lead, and the lead in the bearing will melt and precipitate. When a large amount of lead is precipitated, the bearing surface of the bearing is getting smaller and uneven, which aggravates the wear, and the local temperature can exceed the melting point of copper (1083) in severe cases, and the copper also begins to melt, which eventually leads to serious ablation of the crankshaft and bearing or the consequence of "pad holding the shaft".

According to the test, when the oil temperature reaches 110, the oil film temperature in the bearing clearance can reach 150. If the oil film temperature is as high as 150 or more, it is easy to break and form semi-dry friction. Because the crankshaft bearing is a copper-lead alloy, if the reduction measures are not taken properly, the temperature of the bearing will be too high and the lead will melt and precipitate, and the consequences will be unimaginable.

Therefore, when the temperature of oil and water is too high at the same time, the oil temperature should be lowered first.

2. Fault diagnosis should be from easy to difficult, first check the oil volume in the hydraulic oil tank, if the oil volume in the oil tank is insufficient, it should be added to the standard liquid level in time. Attention should be paid to the use of hydraulic oil of the same grade when filling, and filtration should also be carried out before use.

3. If the amount of oil is appropriate, it is necessary to check whether the oil cooling system is blocked, and if the oil cooling system is found to obstruct air circulation, it should be cleaned in time to ensure normal air circulation and heat dissipation. Sometimes the fan belt is too loose and slippery, which will also lead to the reduction of fan efficiency and poor cooling effect, so it should be checked and adjusted in time, and a new belt should be replaced if necessary.

4. If there is no problem with the oil quantity, oil cooling system, and fan tape, it can be judged that the set pressure of the main safety valve is lower than the standard value. The pressure setting value of the main safety valve should be adjusted again to the standard value.

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During the use of the excavator, a variety of problems will occur over time. The high temperature of excavator hydraulic oil is a fault phenomenon that we often encounter in maintenance, because it has a large impact on the performance and life of the machine, it is often difficult to exclude, and the high temperature problem has brought great trouble and confusion to the excavator user, so solving the high temperature problem is the responsibility that our maintenance personnel cannot avoid.

Causes of high temperatures:

The high temperature of the excavator is generally divided into gearbox (transfer case) and the temperature is too high; The temperature of the hydraulic oil is too high; The engine coolant temperature of the engine is too high (commonly known as high water temperature). The reasons for the high temperature of the gearbox are relatively simple, and the main reasons are that the size and shape of the bearings or gears and shells are not standard, the lubricating oil is unqualified or the oil level is not suitable. Today I'm going to focus on the problem of high hydraulic oil temperatures and engine coolant temperatures.

1 It may be that the power output of the excavator diesel pump is wrong.

2 It may also be that the hydraulic pump of the excavator has internal leakage.

3 Or the excavator's water tank is blocked.

4 Or there is a problem with the oil used in the excavator, if it is the Komatsu excavator engine with load and high hydraulic oil temperature failure after the recent oil change, it is recommended to replace it with the oil used before. If there is no oil change, it is advisable to check if the oil has not deteriorated.

5 The speed power of the excavator engine is inconsistent with the specified value, resulting in the load of the Komatsu excavator engine and the high temperature of the hydraulic oil.

6 Manifold Issues.

7 The flow control piston is jammed.

8 There is a problem with the distributor valve group, the valve is stuck, resulting in the Komatsu excavator engine being loaded and the hydraulic oil temperature being high.

The high temperature of the hydraulic oil of the excavator will cause the excavator to work weakly, and reducing the temperature of the hydraulic oil may solve the slow working fault of the excavator. Excessive thickness of dirt deposited on the surface of the radiator will cause poor heat dissipation and ventilation, resulting in high oil temperature; The fluid level in the hydraulic oil tank is too low and the amount of oil circulating in the system is insufficient, which will cause the system oil temperature to be too high.

Choose the right oil, according to different excavator models, working places and temperatures to choose different hydraulic fluids. For a small number of special machines, special hydraulic oil should be selected, and should not be mixed with other oils.

In addition, the climate difference between the north and the south, due to the extremely cold winter in the north, therefore, users should choose low-condensation hydraulic oil when choosing excavator hydraulic oil in winter. If the hydraulic system of the excavator has maintenance problems, anti-wear hydraulic oil should be selected for maintenance work.

The methods to solve the high temperature of the hydraulic oil of the excavator are: check the hydraulic oil level, remove the hydraulic oil radiator of the excavator, replace the hydraulic oil filter element of the excavator, check the quality of the hydraulic oil, and avoid idling for a long time.

1. Check the hydraulic oil level.

The hydraulic oil level height of the excavator must be kept within the specified range. If the oil level is too low, the hydraulic oil will not circulate and dissipate heat poorly, resulting in high oil temperature. Therefore, the driver should regularly check the hydraulic oil level, and add the specified type of hydraulic oil in time to ensure that the oil level height meets the specified requirements.

2. Clear the hydraulic oil radiator of the excavator.

The excavator hydraulic oil radiator is used to cool the hydraulic oil, if there is too much dust and debris on the surface of the radiator, it will hinder the heat dissipation of the hydraulic oil, resulting in high oil temperature. Therefore, the driver should regularly remove the dust and debris on the surface of the hydraulic oil radiator of the excavator to ensure that the surface of the radiator is clean, so as to ensure the normal heat dissipation of the hydraulic oil.

3. Replace the hydraulic oil filter element of the excavator.

The hydraulic oil filter element of the excavator is used to filter impurities and particles in the hydraulic system. If the filter element is not replaced for a long time, it will affect the cleanliness of the hydraulic oil, resulting in clogging of the hydraulic system and high oil temperature. Therefore, the driver should replace the hydraulic oil filter element of the excavator according to the specified cycle to ensure the cleanliness of the hydraulic oil.

4. Check the quality of hydraulic oil.

If the hydraulic orange buried oil of the excavator has been used for a long time, or the quality of the hydraulic oil is poor, it will affect the performance of the hydraulic oil, resulting in high temperature of the cracking oil. Therefore, the driver should regularly check the quality of the hydraulic oil, and replace the aging and poor quality hydraulic oil in time to ensure that the quality of the hydraulic oil meets the specified requirements.

5. Avoid idling for a long time.

When operating the excavator, the driver should avoid idling for long periods of time. Due to the low engine speed at idle, the speed of the hydraulic pump will also decrease accordingly, resulting in a slow flow rate of the hydraulic oil and an increase in oil temperature. Therefore, the driver should reasonably control the working time and rest time of the excavator to avoid the problem of high hydraulic oil temperature caused by long-term idling.

Summary. Hello <>

The hydraulic oil temperature of Sany excavator should be maintained between 40 and 70 degrees Celsius under normal working conditions. If the hydraulic oil temperature reaches 82 degrees Celsius, it is recommended that you check and repair the hydraulic system to avoid potential failures. If the hydraulic oil temperature of the excavator is too high, it may cause the following problems:

1.Hydraulic oil viscosity decreases: When hydraulic oil reaches a certain temperature, its viscosity may decrease, which can lead to a decrease in the efficiency of the hydraulic system, which can affect the performance of the excavator.

2.Damaged machine parts: Overheated hydraulic fluid can damage parts and components in the machine, such as seals or other important components, causing the system to leak or fail.

3.Increased frequency of hydraulic system maintenance: Working at excessively high hydraulic oil temperatures, hydraulic systems need to be inspected and maintained more frequently, as overheated hydraulic oil can lead to increased wear and tear on all parts of the system.

Therefore, it is recommended that you check the hydraulic system of the excavator in time and take the necessary measures to keep the temperature of the hydraulic oil within the normal range. For example, check if the hydraulic oil cooler is working properly, or replace the hydraulic oil to improve its heat resistance, etc.

Is it normal for the hydraulic oil temperature of Sany excavator to be 82 degrees?

Hello <>

The hydraulic oil temperature of Sany excavator should be maintained between 40 and 70 degrees Celsius under normal working conditions. If the hydraulic oil temperature reaches 82 degrees Celsius, it is recommended that you check and repair the hydraulic system to avoid potential failures. If the hydraulic oil temperature of the excavator is too high, it may cause the following problems:

1.Hydraulic oil viscosity decreases: When hydraulic oil reaches a certain temperature, its viscosity may decrease, which can lead to a decrease in the efficiency of the hydraulic system, which can affect the performance of the excavator.

2.Damaged machine parts: Overheated hydraulic fluid can damage parts and components in the machine, such as seals or other important components, causing the system to leak or fail.

3.Increased Hydraulic System Maintenance: Operating at excessively high hydraulic oil temperatures requires more frequent inspection and maintenance of hydraulic systems, as overheated hydraulic oil can lead to increased wear and tear on all parts of the system.

Therefore, it is recommended that you check the hydraulic system of the excavator in time and take the necessary measures to keep the temperature of the hydraulic oil within the normal range. For example, check if the hydraulic oil cooler is working properly, or replace the hydraulic oil to improve its heat resistance, etc.

The oil temperature is too high