Excavator's whole car is weak, the speed is very slow, and the cause of frequent bursting

Simply mentioning the main relief valve, the first impression of the machine friends is that the valve is very important, many very difficult fault problems, in the final analysis, the main overflow valve is abnormal, but the specific role may be very strange.

For example, everyone may have encountered the phenomenon that the whole car is weak and slow in excavator spare parts work. Sometimes the high pressure oil pipe is often bursting, even if it is replaced after the replacement, in fact, the "culprit" of these problems. It is the main relief valve!

Main relief valve function:

In the hydraulic system, the main relief valve functions to regulate and limit the system pressure and protect the entire hydraulic system from damage. It is mounted on the main control valve (distributor) and has a cylindrical shape. The top of the main relief valve is available. Hexagon adjustment, unlike other safety valves (overload relief valve), there are two fixing nuts on the top of the main relief valve.

The main relief valve power is derived from the hydraulic spare parts, and the main relief valve controls the system pressure, and flows through the main control valve to each action cylinder or motor to control the safety of the entire hydraulic system and the performance of the excavator.

Main relief valve failure:

1 high-pressure oil pipe often bursts, after the replacement of the new oil pipe will still burst, this phenomenon requires the main overflow pressure of the excavator to be checked.

Solve! Generally, this phenomenon is caused by the explosion of the main pressure of the excavator hydraulic system, as long as the main relief valve is reduced to the standard pressure.

2 Excavator is weak in the whole work at work, and the speed is very slow. This fault phenomenon is a common fault of the komatsu excavator spare parts, usually due to the system pressure is too low, the main relief valve is blocked by impurities or the main overflow valve is seriously worn. As a result, the flow rate is reduced, and the main overflow pressure is also reduced, and the excavator will be incompetently slow.

Solve! This phenomenon generally occurs, it can be disassembled and cleaned slightly, and some cases must be replaced.

Main relief valve adjustment:

When adjusting, use the wrench to loosen the tightening nut (C) in the figure and turn the adjusting nut (D) clockwise. The pressure increases and the counterclockwise rotation pressure becomes smaller. After tightening the nut, test the vehicle again to confirm whether the pressure value after adjustment is normal ( A pressure gauge must be installed when adjusting).

to sum up:

According to the above article, we have also found that the long-disturbed excavator has no power, the speed is very slow, and the cause of the frequent squib failure. The next step is to start checking and adjusting, but because the main relief valve is in the hydraulic system. A very important precision part, so be careful when making adjustments! https://jnjmzm.wixsite.com/sdjygcjx