Hitachi excavator stopped work due to manufacturer s quality problems 15

If you have absolute evidence that it is caused by the quality of the excavator, you can go to a lawsuit to ask for compensation, if you do not have 100% evidence to prove, even if there is 80%, because you can't afford to hurt ah, the sales of excavators and financing companies are separated, the quality problem is the manufacturer's problem, the repayment is the financing company, the sales company is nothing more than the loss of reputation, they are only responsible for maintenance, the manufacturer and the financing company have a lawyer advisory group, they are specialized in lawsuits you can't afford to spend ah, no matter from any angle, They will find the problem of your improper use, such as playing butter several times a day, releasing water every day, checking around the machine, you can look at the very thick instructions for use that they gave you when they handed over the machine, and operate according to their operating requirements, try to ask who can do it, if you can't do it, it is your operation problem, in short, they are strong, we are weak, it is best to discuss with them well, to obtain the greatest benefits, it is really big, they don't care, you and they can't afford to litigate, it really hurts, it is time-consuming, labor-intensive and costly. In the end, you have to pay back the money and sue you to pay back the money.

Find a better lawyer for this, you ask. Such cases arise every year. As long as it is an excavator, it is not broken.

This is difficult, if you have a loan, you can extend the repayment time....

1.The excavator cold car is difficult to start, which means that the excavator is started when the excavator is cold, and the excavator cannot be hit without starting traces. The causes of the problem are:

The use of mismatched fuel, excavator work according to the working environment to choose different fuel, for example, in winter to choose a large viscosity of diesel, summer to choose a small viscosity of diesel.

The excavator battery is short of power or the battery line joint is loose.

The excavator engine cylinder pressure is lacking, and the engine valve is not tightly sealed.

Excavator solenoid valve fault.

The fuel injection of the excavator fuel injection pump is lacking, and the fuel in the fuel injection pump will flow back to the fuel tank after the excavator is parked, and there is no fuel in the fuel injection pump, so it is difficult to start the problem.

Fuel system glitches.

The gap between the engine cylinder liner and the piston is too large, and the valve structure is severely leaking.

The diesel pump plunger is worn or the outlet valve tension spring is cracked.

Circuit question, debugging motor damage.

In addition, the winter excavator work is very simple and difficult to start the appearance, so the excavator usually has to preheat the excavator in advance when working in winter, if the excavator is still not able to start after the use of preheating function, the method of spraying the liquid can be used to solve the problem, but the engine fluid can not be used more, and the generator starts the motor problem.

2.The reason why the excavator is difficult to start the hot car:

When the excavator is working and the fire is extinguished again, the excavator can not be started, usually because of the excavator oil pump or grease nozzle fault, the common disposal method is to use cold water to pour the oil pump, if it can start smoothly, it is clear that the oil pump has doubts, the need to calibrate the oil pump and check the grease nozzle, if it can not start smoothly, then the demand is in accordance with the above cold car is difficult to start the cause of the problem step by step.

Summary. If the excavator can't be oiled, it is recommended to check whether the wiring harness in the cab is broken. The excavator rotates the throttle and twists it to see if the excavator reacts?

See if the stepper motor has action? If it doesn't work, it's probably a problem with the throttle motor. There may also be a problem with the speed sensor, and the generator is a bit of a problem with neutrality.

Some excavators have sensors installed on the flywheel housing, and some use the neutral point of the generator to take the signal to see the rotational speed).

Hello dear<>

I'm glad you asked, what is the alarm of Hitachi excavator operation method, the main reason for digging is mainly to see the sound of the big pump, there is no obvious pitch change and judgment noise, if the slope operation of the big pump sound is not right, it will be simple to add hydraulic oil.

The big pump is no problem, but the electric throttle can't add oil.

The excavator is slow to slow down and not oil, it is recommended to check whether the wiring harness in the cab is broken. The excavator rotates the throttle and twists it to see if the excavator reacts? See if the stepper motor has action?

If it doesn't work, it's probably a problem with the throttle motor. There may also be a problem with the speed sensor, and the generator is a bit of a problem with neutrality. (Some excavators have a positive noise sensor installed on the flywheel housing, and some use the neutral point of the generator to take the signal to see the speed).

Yes, just find a reliable repair shop.

In the process of daily excavator maintenance and repair, common faults include no action of the excavator, high water temperature, no force, walking single, jammed, hydraulic pump trembling, lack of force, slow action, hydraulic pump sound, weakness, holding the machine, high oil temperature, stuck machine, dropped arm, hairpin, engine black smoke, no force to burn oil, engine exhaust gas, slow walking, weak walking, slow heat engine action and circuit failure.

For the failure of the excavator to work, if the engine power is sufficient, the operation is normal, and the excavator is slow and the excavation is weak. Usually, the hydraulic pump of Hitachi excavator is mostly a variable piston pump, after a certain period of work, the internal parts of the pump will inevitably wear out, resulting in internal leakage, and the data of various parameters are not coordinated, resulting in insufficient flow, high oil temperature, slow speed, and can not establish high pressure, so the action is slow and weak.

For this kind of problem, the hydraulic pump must be removed for data measurement, the problem is confirmed, the accessories that can no longer be used, or the accessories that can be used can be repaired, reassembled and debugged on the calibration bench, and matched the parameters of each circuit (pressure, flow, power and variables, etc.).

An important hydraulic component on Hitachi excavators is the multi-way distribution valve, which has the main safety valve, secondary valve, relief valve, oil filling valve, etc. If the pressure set by these valves does not reach the standard pressure, the digging will not be able to do so. In addition, if the gap between the valve stem and the valve hole is too large due to wear, the valve stem is not fully returned and the direction is not in place, a large amount of internal leakage will lead to insufficient flow and slow speed.

For such problems, the multi-way distribution valve should be removed, sent to the test bench for debugging, and the pressure of all valves should be reset to the standard pressure, and the gap between the valve stem and the valve hole should be eliminated.

The hydraulic pumps on the imported excavators are equipped with pilot gear pumps, which are mainly involved in the variable of the hydraulic pump and the valve stem that opens the multi-way distribution valve as the pilot oil to make it reversible. If the gear pump is worn excessively and cannot establish a certain pressure or the safety valve on the gear pump cannot be set to a certain pressure, it will cause the hydraulic pump to always be in a low flow state, and the valve stem can not be completely reversed, resulting in insufficient flow, slow action, insufficient pressure and weak excavation.

For this kind of problem, it is only necessary to change the pilot gear pump or reset the pilot safety valve.

If everything is normal when the Hitachi excavator is cold, it is slow and the digging is weak when it is hot.

The occurrence of such a problem indicates that the internal accessories of the hydraulic pump are seriously worn, and the wearing parts in the pump must be replaced, and reassembled and calibrated on the commissioning platform.

Another main reason for the slow and weak work of Hitachi excavators is the deterioration of hydraulic oil, so it is necessary to pay attention to monitoring the oil quality of hydraulic oil (viscosity, fluidity and whether there are suspended solids, etc.), and replace the hydraulic oil that meets the requirements on time, which can largely avoid the occurrence of such failures.

Our company is Hitachi excavator Fujian**, all about Hitachi excavator can contact me, do not disturb the chat!

Faulty. (The internal parts of the pump are worn).

Valve failure. (PC-EPC valve is used to match the power of the engine and the hydraulic pressure, when the load is induced, the PC-EPC generates pressure, reduces the flow of the pump, in order to alleviate the lack of engine power, and the pump controller generates a signal to the throttle electric pure machine, increasing the engine speed).

The engine speed sensor is damaged.

The hydraulic fluid is dirty.

The dispenser oil seal is damaged.

There is a problem with the hydraulic oil circuit and the hydraulic filter element.

The control valve is not well sealed, and there is oil leakage inside.

Pilot valve failure.

The two regulating valves on the hydraulic pump are clogged.

In view of the reasons why the above excavator starter does not start, Guoxiang excavator maintenance plant gives the following solutions:

1. Check whether the battery charging gear is sufficient, if it is indeed insufficient charging, it should be taken down for charging; Replace the battery if necessary;

2. Connect the battery wiring column and connector;

3. Repair the battery grounding wire.

4. Check the starting circuit so that there is fire at the terminal of the starter;

5. Check the starter battery relay and exclude the electromagnetic relay.

Fault; The sound of the electromagnetic relay engaging and disconnecting should be clearly heard when starting;

6. Check and repair the starter;

7. Restart to make the starter drive gear meshed with the engine flywheel change gear position;

8. Overhaul the starting shaft end bearing of the starter;

9. If the torque of the starter is not enough, replace the starter if necessary;

10. Check the engine to make the engine in normal operation;