New power takeoff shaft chipper HEM 821 Z with optimized drive concept

JENZ now also carries out the optimization of the HEM 820 series for the power takeoff version. The first new HEM 821 Z left the productions halls in Petershagen in March.

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The replacement of the HEM 820 Z is characterized through innovative solutions regarding the propeller shaft, force distribution on the hydraulic system and woodchipping discharge. The freewheel mechanism is now integrated directly behind the power takeoff stub on the machine side, the lighter yoke PTO shaft is bolted on in front of this. This leads to lower wear of the PTO shaft and reduces the maintenance costs. The hydraulic pumps now are driven by a mechanical power divider. This increases the ground clearance which is a further advantage for off-road capability. At the same time the maintenance costs are reduced.

The hydraulic blower is now a standard feature on the HEM 821 Z. Thereby the ejection blower rotation speed can be controlled infinitely variably and irrespectively of the chipper rotor speed, which means it can be optimally adjusted to the deployment conditions since the blower seldom has to run at full speed. In addition, the delivery pipe has been re-engineered. Overall woodchippings can be loaded over a longer distance, and also more accurately, without unnecessary friction losses and the lowest possible wear.