The komatsu excavator swing problem and solution is a talk of komatsu excavator defects. It may have been due to the time it was first use or over workmanship, but it doesn’t make sense why it has stopped working.

The komatsu excavator mechanical part is worn and the oil circuit has no pressure

There are many causes for the lack of pressure in the hydraulic system of the Komatsu excavator. The main reasons are as follows:

1. The pipeline of the main control valve is leaking.

2. The solenoid valve is stuck or damaged.

3. The pressure of the pump is too small.

4. There is a foreign object in the oil return hole of the pump or in the suction filter screen of the oil pump, causing the oil suction pipe to be blocked or insufficient.

5. There are metal fragments in the hydraulic system, which block or damage valves, pumps and other parts, causing pressure loss or low pressure, or even no pressure at all;

6. The relief valve on the hydraulic pump leaks, causing low pressure;

7. There is air in the hydraulic system, which makes it impossible to work normally and affect its normal work;

8. The high-pressure hose is broken and leaks oil;

9. Damage caused by poor maintenance habits such as lack of maintenance, wrong operation, negligence and so on.

The komatsu excavator internal leakage of the oil seal and the cylinder tube is large or the seal is not tight

When the komatsu excavator internal leakage of the oil seal, the cylinder tube is large or the sealing is not tight and other problems will occur. When these faults occur, we need to know how to repair it. The following are some of the problems that may occur during the operation and how to repair them.

Internal leakage of oil seal

The main reason for this phenomenon is that the side clearance of the working pair is too large, which causes the extrusion deformation of the oil seal to cause leakage. For this reason, we must pay attention to whether the working pair has a side clearance when installing, because too large can cause oil leakage. Therefore, when installing and replacing, we must strictly control.

The sealing effect between the cylinder tube and piston rod is not good

When installing, if there is no interference fit between the cylinder tube and piston rod, it will cause an inadequate lubrication effect between them. In this case, we re-adjust it according to this situation. If you encounter a problem with a high pressure oil cylinder, you should check whether there is any problem with its parts or whether there is any damage in operation.

The komatsu excavator oilway is improperly installed, which leads to the failure of the cylinder to work normally

The komatsu excavator oilway is improperly installed, which leads to the failure of the cylinder to work normally. The hydraulic system is not properly installed, and the hydraulic system pressure is reduced. The internal leakage of the hydraulic cylinder piston seal ring causes insufficient hydraulic pressure to cause the working device to move slowly or even stop moving.

The oil passage is not connected or opened. The circuit opening of the solenoid valve or reversing valve is closed. The oil passage is blocked with impurities. The oil temperature is too high and the viscosity of the oil (especially in summer) is too large.

The relief valve setting pressure is too low, or the relief valve leaks seriously, so that the pressure reaches the set value and cannot be increased. When loading heavy objects, when the bucket is filled with sand or other materials, it will cause high load and lead to a slow rise in pressure

The pipeline inside the hydraulic system has a large resistance due to dirt ingress, excessive pipe bending or a small diameter of 8-10mm. In winter, if there is water in it and it freezes into ice, it will also cause blockage; when loading heavy objects, when buckets are full of sand or other materials will cause high load.

The komatsu excavator air valve spool and valve seat are stuck, which leads to the failure of the cylinder to control normally

Today, the editor will share with you the reasons and maintenance methods for the failure of the cylinder in the komatsu excavator. The following are the specific contents.

The main failure is that the air valve spool and valve seat are stuck, which leads to the failure of the cylinder to control normally. After inspection, it is found that there are abrasives and rust on the valve seat surface. It should be noted that when cleaning, care must be taken not to damage the valve seat surface by using improper tools or excessive force.

If it is caused by improper operation or bad habit of inspecting and lubricating, we should take measures to overcome it. This kind of failure is common in komatsu excavators with a running time of more than 2000 hours. Therefore, attention should be paid to cleaning and preservation when overhauling.

There is dirt in each part of the komatsu excavator oil circuit, which leads to insufficient oil supply and can not exert normal power

There is dirt in each part of the komatsu excavator oil circuit, which leads to insufficient oil supply and can not exert normal power.

The cylinder head gasket (combustion chamber) and the rocker arm cover are leaking oil. When the engine is started, the air enters through the crack of the joint, causing excessive pressure in the combustion chamber and cylinder head, which in turn causes deformation of the cylinder head and cylinder block. In addition, when the engine is running at high speed, high temperature gas enters from the leaky part. The sealant around the fire hole is burned out, leading to fire hole leakage.

Engine assembly has been disassembled or defectively installed, resulting in poor sealing between parts, resulting in leakage of combustion gas, which can lead to overheating of crankcase oil and overheating or failure of critical parts such as piston rings.

Poor sealing between valve stem and guide sleeve can cause burning of sealant on valve stem or valve seat ring, resulting in leakage of combustion gas into lubricating oil circuit.

Crankcase oil is contaminated with water or coarse particles that can cause abrasion on moving parts or clogging on filter screen.

You can solve komatsu excavator swing problem with these methods

Komatsu excavator is a kind of hydraulic excavator which can be used for mining, construction, road and bridge construction. In the process of using it, there may be some problems. Today, we will tell you how to solve komatsu excavator swing problem.

First of all, let’s take a look at what causes komatsu excavator swing problem:

1. The main reason is that the accumulator pressure is too low or the swing motor oil pressure is too low;

2. A frozen drain plug on the filter body;

3. The plunger pump, control valve or other piping components are damaged;

4. The oil seal is damaged, resulting in leakage of the liquid in the oil tank;

5. There is air in the system;

6. The accumulator fails and cannot generate gas pressure to pressurize the liquid.