Small excavator bypass valve failure how to do?

[DIG-DOG]

Small excavator bypass valve failure Today to analyze the Small excavator central bypass valve failure.

1. Lift the boom, dig and unload the bucket at low speed, the central bypass valve is stuck in the open position, the oil output of the main pump returns to the hydraulic tank, the boom rises and the working circuit of the bucket is out of reach, remove the central bypass spool for cleaning.

2. The boom rises slowly, and hydraulic noise occurs when the boom rises: the boom logic check valve is stuck, the pressure oil cannot enter the boom lifting oil circuit, and the boom logic check valve is removed.

3. The rocker extends or retract at low speed: the central bypass valve core is stuck in the open position, the oil output of the main pump flows back to the hydraulic tank, and cannot enter the working circuit of the bucket rod, and the central bypass valve is removed for cleaning.

4. The motor starts to rotate, but the engine cannot start: the central bypass spool is stuck in the closed position, the oil output of main pumps 1 and 2 cannot return to the hydraulic tank, and the central bypass spool is removed and cleaned.

About the Small excavator
bypass valve failure understanding is this, I hope to help you. Small excavator

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