Feller Buncher Cylinder

Jiangsu Ying Naisi Machinery Manufacturing Co., Ltd. is one of the leading manufacturers and suppliers of feller buncher cylinder in China. We are committed to providing high quality customized service and OEM&ODM service for global clients. If you're going to wholesale advanced feller buncher cylinder made in China, welcome to get quotation from our factory. For price consultation, contact us.

The feller buncher cylinder is a heavy-duty hydraulic actuator engineered for the cutting, accumulating and positioning functions of tracked or wheeled feller bunchers. It operates in one of the most contaminated mobile-hydraulic environments in forestry: abrasive mineral soil, bark particles, pine resin and tar, combined with extreme winter temperatures and mechanical impact from falling or shifting timber. System pressures on modern forestry machines commonly reach 25–35 MPa, and cylinders cycle continuously under combined axial and side loads as the boom swings through its arc. Typical cylinder positions include boom hoist, stick/reach, and head tilt, with bore sizes ranging from roughly 110 mm to 130 mm on production machines. The cylinder is built with high-strength alloy steel barrel and rod, a heavy-duty rod wiper and multi-component seal system to exclude contaminants, and guide rings or wear rings to carry side loads without metal-to-metal contact. Internal cushioning is often incorporated to reduce shock at end of stroke, particularly in clamp and accumulator arm circuits. Each unit is pressure-tested and leak-tested before shipment.

Feller buncher cylinders are used on disc-saw and shear-type felling heads for tree severing, single- and multi-tree accumulation, and head positioning. They equip boom hoist, stick/reach, tilt and leveling functions, as well as clamp and accumulator arms that grip and hold cut trees during bunching. The cylinders suit tracked and wheeled feller bunchers operating in plantation thinning, selective harvesting, and steep-slope logging, including machines from major forestry OEMs.

FAQ

 

 

Q1: What makes a feller buncher cylinder different from a standard construction hydraulic cylinder?

A:The primary difference is the combination of contamination exclusion and side-load tolerance. Forestry cylinders are exposed to bark particles, mineral soil and resin that rapidly destroy standard chrome plating and seal lips. They also see continuous side loads as the boom articulates through its arc. Feller buncher cylinders therefore use heavy-duty wipers, guide rings or wear rings, and seal systems selected for abrasive environments, rather than the simpler wiper and guide arrangements common on general-purpose construction cylinders.

Q2: What are the main failure modes to design against?

A: Field inspection data identifies cylinder seal loss, hose chafe, and pin/bushing wear as the dominant cylinder-related failure modes on felling heads. Rod scoring and chrome loss caused by abrasive particles and side-loading are also common, and seal degradation is typically observed around 6,000 operating hours on forestry machines. The cylinder design addresses these through hardened rod surfaces, contaminant-excluding wipers, and guide elements that resist side-load-induced misalignment.

Q3:Can you customize feller buncher cylinders for specific machine models or head configurations?

A: Yes. Bore size, stroke, mounting pin dimensions, port position, rod end configuration and cushioning requirements can be customized to match OEM specifications or replacement needs. Seal compound and rod coating options are selected according to the operating environment, including cold-climate and high-abrasion conditions.

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