1. Komatsu PC200-5, the speed of the whole car is suddenly slow, and the pump control computer board displays the fault code: 17. It means that there is a problem with the engine speed. Check the speed sensor and its wiring harness. It is found that one wire of the sensor is disconnected, and it is normal after connection.
Second, Komatsu PC200-5, turning and walking right suddenly disappeared within a few minutes. During the test run, it was found that the fuel pipe of the front pump was strongly vibrated. Check that there is a large amount of copper iron in the oil return filter element of the fuel tank. Copper and iron powder also appeared in the oil drain of the front pump casing. The front pump is badly damaged.
3. Komatsu PC200-5 is a second mobile phone. It has been used for 3 years. After purchasing the machine, it was found that the boom and boom were slow during work, and the others were normal. After inspection, the half-flow valve of the stick is artificially modified and works normally after restoring the original system.
Fourth, Komatsu PC200-5, crawler walking is weak, no walking low gear. After replacing the seal of the central rotary joint, the fault remains. Check the travel speed solenoid valve and find that the valve core is stuck due to the dirt in the oil. Normal after cleaning.
Fifth, Komatsu PC200-5, the rotation is suddenly no, other actions are normal.
Check: Start the engine, release the rotary brake control oil pipe, and find that the oil pipe has no pressure oil. It indicates that the outlet pressure of the self-rotating brake solenoid valve is abnormal, there may be two reasons: the first may be that the solenoid valve spool is stuck in the closed position, and the pilot oil cannot pass through; the second may be that the solenoid valve coil is broken and the spool cannot be opened. Use a multimeter to measure the coil resistance. The resistance is 0, and the normal resistance should be 15.5. Normal after replacing the solenoid valve.
Sixth, Komatsu PC200-5, the start and end of the swing and right walking movements have a big impact. The test machine found that in addition to turning and braking from right walking, the middle operation process was normal, and the rest of the actions were normal.
Seven, Komatsu PC200-5, walking and running.
After the test, only the walking side was found to be off course. After exchanging the two main pump tubes, it is changed to the other side, and the fault is in the main pump or its variable mechanism. The servo valve is adjusted as usual, and it is invalid when trying to increase the pump flow; it is also invalid when trying to reduce the main pump flow. Open the upper cover of the servo valve and find that the piston in the servo valve has rusted.
