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| Illustration 1 | g01880293 |
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| Illustration 2 | g01850404 |
Control manifold (1) is designed to relieve pressure in the section of the hydraulic system that operates gerotor motor (2) . Two crossover relief valves make up the control manifold. The relief valves protect each side of the motor circuit from excessive pressure.
The pressure setting of each relief valve is 14000 ± 1000 kPa (2030 ± 145 psi). When the control manifold for the rotation of the work tool is activated, oil is supplied to one side of the motor circuit in order to operate the motor. If the oil pressure exceeds the setting of the relief valve for that circuit, the relief valve will open. Oil is then able to flow to the other side of the motor circuit and back to the tank.
When each relief valve opens, excess pressure is dumped to the opposite side of the motor circuit. This design prevents total hydraulic pressure loss during rotation. This is a safety measure that improves the efficiency of the work tool.