Hyundai R140-7, Service Manual

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Page86
Construction Equipment
16)Over Load Preventing Function (Minimazing)
- When a machine is under load or the cylinder arrives at
the end of stroke, the pressure is increased
Cylinder pressure > spring pressure (B + D)
The pressure is applied at the piston D and compresses
the spring D and B
So, the valve B moves to LH side and the oil enters the
piston C through the passage at piston B
The piston C moves the swash plate to reduce the angle
upon the angle upon the load of cylinder.