NPK M20C, Instruction Manual, Page: 31 / 152

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PROCESSOR – BOOSTER AND CYLINDER
I INTRODUCTION
The hydraulic cylinders used on the NPK Material Processor are equipped with a
shared hydraulic booster. To close the jaws of the processor, hydraulic oil from the
carrier is directed to the base end of the cylinders, which extends the cylinder rods.
Under no load, no boost is applied and this results in a rapid cycle time as compared to
large, non-boosted cylinders.
When a load (material to be crushed or sheared) is encountered, pressure builds and
shifts the sequence valve of the booster. This directs oil into the booster section, which
intensifies the pressure well beyond the system operating pressure of the excavator.
The compact NPK Boosted Cylinder System provides a working force equal to a far
larger un-boosted cylinder, which are working at excavator system pressure. Because
the NPK boosted cylinders are smaller, they require less oil for full stroke as compared
to large diameter cylinders. This reduces cycle time for the NPK Material Processor.
To open the jaws of the NPK Material Processor, oil is directed to the rod ends of the
cylinders. This retracts the rods and pulls the jaws open. No boost is provided in the
jaw open mode.
c11 Jaw Cylinder
c14
Booster Piston
c15
Main Valve Assembly
c16
Sequence Valve
Cartridge
c17 Relief Valve (close)
c18
Relief Valve (open)
c44
Swivel Manifold
k2 Carrier Hydraulic Pump
k7 Carrier Control Valve