JOHN Deere has launched three new harvester heads, suiting a range of requirements – from first thinnings to final fellings.

The H423 head has been designed for thinnings and small-size trees, offering a maximum cutting diameter of 580 mm. The more robust H425 and H425HD heads are designed for final fellings and big trees, offering a maximum cutting diameter of 710 mm. The H425HD model features HD motor guards, HD tilt handle and expander pins in the upper tilt cylinder, feed motor arms, and lower delimbing knives.

Feeding is described as efficient and fast, thanks to the harvester heads’ unique four-wheel drive and the mechanical locking of the differential. A firm grip, four-wheel feed and high-performance delimbing are said to ensure high productivity.

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The PEVO valve improves the harvester head’s performance, adjustability, and economy compared to the predecessor model, while improved hose routing from the boom to the harvester head and from the valve block to feed motors improves hose durability. The new, hinged valve block cover makes daily maintenance easy.

Forestry Journal: The H423 harvester head.The H423 harvester head.

Grease points and the saw chain oil tank are also easier to access, and the greasing interval is longer than before.

These models are all equipped with the new SuperCut 100S saw unit, which offers automatic chain tensioning and mechanical bar locking.

The new harvester head models replace the previous H413, H415 and H415HD models.

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