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Volvo EC330B Excavator Brake valve operation

Volvo EC330B Excavator Brake Valve Operation

Procedures:
1. Brake valve is now at neutral position.
2. The pressure of supply line goes high and this pressure applies to the backside of brake valve and then pushes the brake valve against spring. So return side oil can go to tank.Volvo PTT Diagnostic software
3. When machine travels at the down slope, this can cause overrun. That means the amount oil of supply line is less than expected. In this case we need brake function to control the machine from over-speed.
The pressure of supply line becomes low and the brake valve return to the neutral position. So we can block the return line and slow down the machine speed. During this period, the orifice on the brake valve help machine to be driven smoothly.

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