Komatsu excavator undercarriage parts repair

1. The excavator works normally at the beginning, but suddenly one side of the track cannot move and the digging arm is weak. What's the reason?

Most of the reasons are that the hydraulic oil circuit is not clean, and small dirt blocks the damping hole in the middle of a small piston in the safety valve. The safety valve can be removed and cleaned to remove the blockage of the damping hole.

2. Why does the blockage of damping hole affect so much?

This is not only a common fault, but also a fault that has a great impact on the hydraulic system. To be clear, it is necessary to introduce the working principle of the pilot safety valve. The pressure oil passes through the existing damping hole and enters the cavity C. at this time, the pressure of the cavity C is equal to the pressure of the system P. Because of the small spring, the piston is pressed all the way to the right seat. When the oil pressure in chamber C rises to a certain value. That is to say, when it rises to the pressure regulating value of the conical valve, the conical valve is pushed open, and the oil in cavity C returns to the oil tank through the conical valve. At this time, the pressure of cavity C drops suddenly. Due to the damping effect of damping hole, the pressure of cavity C and the system loses balance, so the small piston moves backward to the left, and the system pressure overflows back to the oil tank through the small piston. When the system pressure drops to a certain value, the cone valve resets and the small piston moves to the right. Adjust the system pressure so repeatedly. If the Yinni hole in the middle of the small piston is blocked, no pressure oil can be obtained in cavity C, and the pressure in cavity C is much lower than the system pressure, so the small piston has been in the left position. No matter the system pressure is high or low, it is also in overflow state. So once the small damping hole is blocked, the impact will be great. Therefore, for hydraulic oil circuit I

3. After checking that the damping hole is not blocked, why can't the pressure of the safety valve be adjusted?

This situation is mostly due to the loose closing of the poppet valve and the valve seat, so that the oil pressure in cavity C can not be established.

4. What should be paid attention to when grinding the gear end face?

After the gear of gear pump is worn, it is necessary to use a grinder with high precision for grinding, and to find a master with strong sense of responsibility for operation. For example, the grinding table should be absolutely clean, and no dust is allowed on the platform. Because the worktable is slightly unclean, it will make the ground plane deviate from the vertical line of the bearing hole.

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