The design philosophy behind the C head series is that the stem is held by the feed rollers.
The Komatsu C124 is an updated version of the C123 with a fourth driven feed roller. The Constant Cut function and the multi-tree handling option remain on the C124. A new option on the C124 is head-mounted working lights. Four driven feed rollers were introduced with the C144 and was well received by the market. The rollers centre the stem, which ensures efficient feeding, while the low clamping pressure reduces friction, which results in lower fuel consumption. The fourth driven feed roller makes the C124 productive even when working with smaller and/or crooked stems.
The way in which the C heads centre the stem also contributes to accurate and reliable length and diameter measurements. The diameter sensors in the delimbing knives are fixed, which means no calibration is needed after servicing. The other major new feature of the C124 is the optional integrated working lights. Head-mounted working lights offer several benefits. They make it easier for the operator to collar each tree and reduce the risk of sawing stones and other obstacles.
The Constant Cut saw unit has been fitted as standard since the launch of the C123. Constant Cut guarantees the right chain speed throughout the entire cutting cycle. This means that the operator avoids the risk of over-revving the saw motor, which in turn means more effective cutting and higher productivity. The head has a new saw bar mount with a sturdy construction. Another quality improvement is greater force in the bar return.
The frame of the C124 combines light weight with retained strength. The felling link has a large tilt angle for effective harvesting in steep terrain. This reduces strain on frame components, which has a positive effect on head reliability and operator comfort. The head has cast delimbing knives for maximum durability and good stem handling. The C124 has smart hose routing to ensure good durability and easy hose replacement. The head also uses easily accessible service points for minimal downtime and retained productivity. Source