Komatsu PC200-6 excavator speed is a bit slow (after repairing the pump)

Trouble phenomenon before excavator repair:

More than 10,000 hours of Komatsu 200-6 excavator hydraulic pump just repaired, the pump test speed is still slow, the distribution valve is removed and cleaned and installed slowly, the whole car has a slow speed before repair.

After the excavator repairs the pump, the phenomenon of failure:

Installed the distribution valve and found that the action is gone, try a few times, the arm is slow, the middle arm is slow, the middle arm is slow, and the rotation is slow. Then, the self-reducing valve is disassembled and the main oil passage is found to have the toilet paper distribution valve re-hanged and cleaned. It was found that all the movements only moved a little bit and the same as no action. The pressure was the same as that of the ones. Then the two unloading valves were removed and cleaned. It was found that a little paper was stuck inside. The main gun also changed 2 new ones. Now, the komatsu spare parts arm and the middle arm have other movements, and there is no pressure. The feedback tube does not come to the oil, and the main gun tube does not come to the oil. Later, the gun is removed and the oil is rushed up. The opposite is still the same. After the arm has the stick and the middle arm, I feel that the speed and strength have come up. After trying for less than 1 minute, the machine automatically extinguishes the fire, and the boom is not activated. The middle arm and the stick also have movements.

The Komatsu PC200-6 excavator spare parts has a slow speed (after repairing the pump).

1 Hydraulic oil is dirty or used with fake oil or the vehicle is pulled through the cylinder hydraulic filter dirty.

2 Hydraulic full-disassembly cleaning, hydraulic oil replacement, hydraulic filter replacement.

3 The filter inside the joystick is blocked by something. Use the mouth to blow the filter inside the joystick.

4 Check the pilot 2 pressures of each action first. Check the LS feedback pressure for one action and one action. There is no feedback pressure or the pressure is small. Unpack the small hole inside the pin check to check the LS selector valve. https://jnjmzm.wixsite.com/sdjygcjx