The package will add 860 kg (1,900 lbs) to the front of the skidder to improve traction.The new skidder kit is compatible with the 640H cable skidder and the 648H, 748H and 848H grapple skidders. Weights and all mounting hardware are included in the kit, but the wheel is not included. The optional wheel weight package will add 860 kg (1,900 lbs) to the front of the skidders. John Deere indicates that operators and machine owners will notice a substantial difference in the load that they are able to pull with the heavier wheels.
The weight package, only made for the two front wheels, uses dual ring wheels and SWEDA axles. New wheels with a dual ring that allow the use of 35.5 tyres are also available with the optional weight package. The new wheels are available as a factory option and a field kit. It does not however allow for dual wheels and 35.5 tyres. Source: www.deere.com/en_US/newsroom/forestry_all.html