Products - Auxiliary Equipment - Hydraulic Power Units

100 hp HPU for Cylinders

The hydraulic power unit, which powers all of the hydraulic cylinder functions, is ideally located in a hydraulic room inside the motor house.  In some installations it may be necessary to locate the hydraulic power unit under the feed ramp.  The hydraulic power unit operates at pressures up to 3000 psi (207 bar) servicing the operation of the feed rolls, reject door, shredder tilt and hammer pin-puller.  The shredder tilt and the hammer pin-puller functions are used only during maintenance and are controlled from a control box located on a 50-foot-long (15.24-meters-long) electric control cord

Oil Recirculation Unit

The shredder bearings are lubricated by an Oil Recirculating Unit (ORU) that is built on a skid and typically located near the main hydraulic unit.  The ORU provides clean cooled oil to the bearings continuously by recirculating pumps mounted on a 60-gallon (227-liter) tank.  This tank will be divided into two separate compartments, one for each rotor bearing.  This will prevent the contamination of the entire oil tank in the event of a bearing failure.  The heat exchanger for this unit will operate on water rather than air-cooling, and will be tied into the system that cools main drive motor liquid rheostat and heat exchanger from other hydraulic power units.  We will mount a separate pump and motor on this unit for a standby spare that can be wired up in the event of a failure on the main motor or pump unit.

150 hp HPU for Hagglunds DFR Motors

The Super Double Feed Roller© system uses a pair of hydraulic motors powered by a 150-hp (112-kW) hydraulic power unit.  The additional power is required to maintain sufficient torque at the higher speeds of the feed rollers.  A proportional control card that constantly monitors the current of the main electric motor controls the speed of the SDFR©.  In this way the feed rollers are constantly 'hunting' for the proper speed to feed the shredder.  As the load on the shredder motor decreases, the speed on the feed roller increases.  As the load on the shredder motor increases, the speed on the feed rollers will decrease or, if necessary, even stop.  Use of the SDFR© increases production by minimizing the time periods when the shredder could be shredding but is not.  It minimizes the effect of operator error or poor operating ability.  The SDFR© does all of this and it does it in a way that tends to present a more even flow of shredded material to the downstream separation system.