John Deere Other models
2 models in this series
John Deere 643L: feller buncher with a John Deere PowerTech PSS 6.8L engine, a 24-volt electrical system and an operating weight of 16,383 kilograms for forestry felling and gathering work
John Deere is an American manufacturer of agricultural, construction and forestry equipment headquartered in Moline, Illinois, which also builds self-propelled felling and gathering machines under its own name for forestry work. The 643L belongs to the feller buncher line, machines that fell standing trees and gather several stems before setting them down for further processing.
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The 643L is driven by a John Deere diesel engine of the PowerTech PSS 6.8L type with a displacement of around 6.8 litres, and its electrical system runs on 24 volts. The machine has an operating weight of 16,383 kilograms, a length of 6,290 millimetres, a ground clearance of 482.6 millimetres and reaches a top speed of 17.5 kilometres per hour.
A feller buncher such as the 643L carries a felling head on the boom that grips the stem, cuts it with a saw or shears and holds it, so several trees can be gathered before being set down; this shortens cycle times compared with a harvester, which delimbs and measures every stem individually. The ground clearance of almost half a metre helps on forest ground broken up by roots, stumps and uneven terrain, while the high operating weight calls for a load-bearing extraction trail.
When buying second-hand, the PowerTech engine deserves close attention: oil level, cooling system and exhaust should all be free of leaks. The felling head with its saw chain or shear blades shows wear first on the teeth and on the hydraulic cylinders of the grapple arm. The 24-volt electrical system, with its wiring harness and connectors, needs particular care in damp forest conditions, as does the undercarriage, which works under the machine's high operating weight.
Sources: SpecCodex-Register: Kennwerte des Modells John Deere 643L, John Deere
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