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HYDRAULIC CIRCUIT
CASE TRAINING CENTER
AUGUST 2000
Pump engine running, one control operated
There are two possibilities
1. The maximum torque pressure is not reached
1. The maximum torque pressure is reached
1) The negative flow control signal PZ2 is very low < 2 b. The negative flow control valve E' is totally
pushed on the right side by its spring. The piston B' is connected to the tank through E'. The piston C'
receives pressure from the compensation valve C. The delivery flow is maximum.
If the operator reduces the flow demand the Negative flow control pressure signal increases, the valve E'
comes back to the right and the piston B' receives pressure from the valve A. The angle of the swash plate
decrease the flow is reduced.
1) The negative flow control signal PZ2 is very low < 2 b. The negative flow control valve E' is
totally pushed on the right side by its spring. The piston B' is connected to the tank through E'. When the pump
pressure reach the value of the torque regulation the lever L' push the valve D' to the left and the piston B' & C' are
connected; the force is higher on B' piston and the angle of the swash plate decreases.
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