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Komatsu Forestry Unveils C-Series Carry-Style Heads

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August and September are proving to be busy months for Komatsu America Corp.’s Forestry Division with the release of the first two members of its C-series family of carry-style heads. In August, Komatsu released the C93 Harvesting Head and in September, the C144 Harvesting Head made its debut.

The C93 replaces the prior 350.1 model, and offers significant improvements for better handling of thinning projects as well as crooked stem and multi-stem harvesting applications. With a recommended DBH working range of 6 in. (150 mm) to 15 in. (370 mm) diameter and a maximum cutting capacity up to 23.6 in. (600 mm) diameter, the C93 is available installed on Komatsu 911.5 and 931.1 Harvesters. The head is also available as a loose head for installment on other carriers.

The Komatsu C93, officialy released in august, is already hard at work.

The Komatsu C93, officialy released in august, is already hard at work.

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The C93’s new robust frame design enables the head to more closely follow the tree trunk. The increased 40-degree rearward tilt angle provides faster feeding performance while reducing head frame stress when harvesting and/or reaching on downhill slopes. The high-performance three-driven roller, four motor carry-style feed system provides excellent log wrap for multi-stem processing, while generating up to 5,688 lbf (25.3 kN) of feed force at up to a 16.4 ft/sec (5 m/sec) feed speed.

The C93 is equipped with one lower and two upper hydraulically controlled delimbing knives, and a fixed vertical top knife. The upper knives are designed especially for handling trees with tough limbs, such as lodgepole pine.

Komatsu’s new Constant Cut saw control system features a 29.5 in. (750 mm) saw bar, which includes a new 19cc saw motor with an integrated valve that delivers precise control of saw hydraulic flow and pressure.

The c144, weighing 3,086 lbs. (1,400 kg), has a recommended DBH working range of 8 in. (200 mm) to 20 in. (500 mm) diameter and has a 28 in. (710 mm) maximum cutting diameter. It is available installed on Komatsu 931.1 and 941.1 Harvesters, and can be installed on other carriers as a loose head.

The C144 features a new robust frame design for improved durability and reliability, and a new swing damping system for more responsive head control. The 40º rearward tilt angle provides fast feeding performance and reduces head frame stress when harvesting and/or reaching on downhill slopes. The feed system is completely new utilizing four hydraulic motors and four driven rollers. The standard single belly roller is now supplemented by an additional feed roller located in the feed path. The unique addition of the second roller ensures more contact with the stem, creating feeding force of up to 6,654 lbf (29.6 kN). With a maximum feed speed up to 16.4 ft/sec (5 m/sec), operators can handle more difficult trees and limbs. The feed roller hydraulic circuit has a differential function to ensure that stem feeding will continue even if one feed roller does not have a full grip on the stem.

The C144 is equipped with two upper and two lower hydraulically controlled delimbing knives, and a fixed vertical top knife. The upper knives are specially designed to handle trees with tough limbs, such as lodgepole pine. The leading right upper knife has a ramped cutting edge to assist in cutting larger branches.

The new Constant Cut saw control system features a 32.5 in. (825 mm) saw bar that includes a new 19cc saw motor with an integrated valve to deliver precise control of saw hydraulic flow and pressure.

The Komatsu c144 is the second member of the C-Series family.

The Komatsu C144 is the second member of the C-Series family.

On both models, this constant management of flow and pressure allows the chain speed to be maintained at a constant 130 ft/sec (40 m/sec) throughout the entire cutting cycle. This Constant Cut system, along with automatic chain tensioning and automatic EcoOiler chain oiling, delivers faster cutting performance, reduced energy (fuel) consumption, reduced chance of splitting and/or cracking, reduced saw maintenance, and longer saw motor life. Optional multi-stem accumulation, stump treatment and color marking systems are available to meet specific customers’ needs.

Komatsu’s new MaxiXplorer 3.1 Head Control System is standard and provides a state-of-the art, flexible, and user-friendly control and monitoring system. When installed on a Komatsu harvester, it is a complete system for machine control, head control, crosscutting and administration. Machine productivity is optimized by controlling everything from the head through the crane, cab leveling, transmission, and ladders.

On both models, all grease servicing points, bar oil and color marking tank fill points are accessible from one position when the head is parked on the ground. Electrical circuits are identified by numerical tags, and all solenoids have LED indicator lights identifying when power is at the solenoid.

For more information, visit komatsuforest.us. And check out videos of Komatsu’s forestry equipment being put to the test at youtube.com/user/KomatsuForestUS.

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