Cat has introduced the new Cat HF201B feller buncher head into most of its logging markets.
The head is available with a 40 degree partial or 330 degree tilt, and a cutting capacity of 572 mm (22.5 in). The head structure has been completely redesigned, with four prototype iterations being tested infield and undergoing strain gauge testing. By redistributing weight to the high stress areas, the overall weight of the head has been reduced by 408 kg (900 lb).
Cat has also made the head more robust by using a stronger dual box section frame design, improved arm box structures, stronger pin retention and more use of abrasion resistant material on the saw base. Hydraulic plumbing has been simplified with a 42% reduction in the number of hoses and a 52% reduction in connection points. Hose maintenance is therefore made easier, and the opportunity for leaks reduced.
Grab and accumulator arms were redesigned with single cylinders, thereby reducing hydraulic flow demand by 40%. The arms now have both base and rod end cylinder stubs, so when the arms are opening or closing, the hydraulic oil is dampened at the end of the stroke, cushioning the impact. The new shape and reduced weight of the grab arm reduces the arms mass momentum by 46%, which further improves durability.
Tree handling and bundling has also been improved. The HF201B can hold seven to eight 15 cm (6 in) stems, compared to four to six for the previous model. The new designs for the grab and accumulator arms and the top yoke improve tree control. A 12% larger saw base throat opening makes it easier to position a tree, and improves handling of trees with butt swell. Source: www.cat.com/forestry