This Doppstadt AK640K is a horizontal grinder — sometimes referred to as a tub grinder or wood grinder — a heavy-duty machine designed to reduce bulky organic material such as wood waste, brush, stumps, green waste, and construction debris into uniform, manageable chips or mulch. Doppstadt is a well-established German manufacturer with a long-standing presence in the waste management, recycling, and biomass processing industries, producing shredders, screens, and grinders built for demanding, high-volume applications.
This 2023 machine is offered in used condition and is located in Pennsylvania, USA. It runs on ultra-low sulfur diesel fuel and is fitted with a clutch, which allows the grinding rotor to be engaged and disengaged independently of the engine — a practical feature for protecting the drivetrain during startup and when clearing blockages. The unit is equipped with a folding stacking conveyor, which extends the discharge reach to create separated material stockpiles and folds down for more compact transport between job sites.
Operator convenience and safety are addressed by several additional features. Wireless remote control allows the operator to manage machine functions from a safe distance, improving visibility and reducing fatigue during long grinding runs. A tub top guard provides protection at the feed opening, and auxiliary lighting extends operational capability in low-light conditions. The machine carries an NCR equipment certification code.
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