3 hours ago
What Independent Travel Really Means
Independent travel is a hydraulic control mode found in many modern excavators, particularly in models like the Kobelco SK120-III. This feature allows the machine to move while simultaneously operating attachments—such as the boom, arm, or bucket—without either function compromising the other’s speed or responsiveness. In standard operation, hydraulic pumps are shared across travel and implement circuits, which can lead to sluggish movement when both systems are engaged. Independent travel solves this by splitting pump flow: one pump is dedicated to travel, while the other handles attachment functions.
Hydraulic System Architecture Behind the Feature
Excavators typically use a dual-pump hydraulic system. In normal mode, both pumps combine flow to whichever function demands it most. When independent travel is activated, the system reroutes one pump exclusively to the travel motors, ensuring consistent track speed. The second pump continues to power the implement circuits. This separation prevents the common issue where digging or lifting causes the machine to slow down or stall during movement.
This mode is especially useful in trenching operations, where the operator needs to reposition the machine while keeping the bucket engaged with the ground. Without independent travel, the machine might hesitate or jerk, reducing precision and efficiency.
Activation and Control Interface
On machines like the SK120-III, independent travel is typically activated through the mode selector switch, often located near the operator’s right-hand console. It may be labeled as “travel mode,” “priority mode,” or simply part of the work mode selector. There is usually no standalone toggle switch; instead, it’s embedded within the machine’s operating logic.
Operators should consult the machine’s service manual to confirm activation procedures, as some models require the engine to be at idle or the travel levers to be neutral before switching modes.
Field Applications and Operator Feedback
In pipeline construction, operators often praise independent travel for its ability to maintain smooth movement while dragging pipe or trench boxes. One veteran operator in Pennsylvania recalled a job where his Kobelco excavator had to reposition every few feet while laying conduit. With independent travel engaged, he could keep the bucket aligned and avoid re-digging sections due to misalignment.
Similarly, in forestry applications, machines equipped with grapples benefit from this mode when moving logs while rotating or adjusting the grapple. It reduces the need to stop and reposition, saving time and fuel.
Maintenance and Diagnostic Considerations
If independent travel is not functioning properly, common issues include:
Conclusion
Independent travel is a critical feature for excavators performing simultaneous movement and tool operation. By dedicating hydraulic flow to travel motors, it ensures consistent mobility without sacrificing attachment performance. Operators working in trenching, forestry, or utility installation will find this mode invaluable for maintaining control and efficiency. Understanding how and when to activate it—and recognizing signs of malfunction—can significantly improve jobsite productivity and machine longevity.
Independent travel is a hydraulic control mode found in many modern excavators, particularly in models like the Kobelco SK120-III. This feature allows the machine to move while simultaneously operating attachments—such as the boom, arm, or bucket—without either function compromising the other’s speed or responsiveness. In standard operation, hydraulic pumps are shared across travel and implement circuits, which can lead to sluggish movement when both systems are engaged. Independent travel solves this by splitting pump flow: one pump is dedicated to travel, while the other handles attachment functions.
Hydraulic System Architecture Behind the Feature
Excavators typically use a dual-pump hydraulic system. In normal mode, both pumps combine flow to whichever function demands it most. When independent travel is activated, the system reroutes one pump exclusively to the travel motors, ensuring consistent track speed. The second pump continues to power the implement circuits. This separation prevents the common issue where digging or lifting causes the machine to slow down or stall during movement.
This mode is especially useful in trenching operations, where the operator needs to reposition the machine while keeping the bucket engaged with the ground. Without independent travel, the machine might hesitate or jerk, reducing precision and efficiency.
Activation and Control Interface
On machines like the SK120-III, independent travel is typically activated through the mode selector switch, often located near the operator’s right-hand console. It may be labeled as “travel mode,” “priority mode,” or simply part of the work mode selector. There is usually no standalone toggle switch; instead, it’s embedded within the machine’s operating logic.
Operators should consult the machine’s service manual to confirm activation procedures, as some models require the engine to be at idle or the travel levers to be neutral before switching modes.
Field Applications and Operator Feedback
In pipeline construction, operators often praise independent travel for its ability to maintain smooth movement while dragging pipe or trench boxes. One veteran operator in Pennsylvania recalled a job where his Kobelco excavator had to reposition every few feet while laying conduit. With independent travel engaged, he could keep the bucket aligned and avoid re-digging sections due to misalignment.
Similarly, in forestry applications, machines equipped with grapples benefit from this mode when moving logs while rotating or adjusting the grapple. It reduces the need to stop and reposition, saving time and fuel.
Maintenance and Diagnostic Considerations
If independent travel is not functioning properly, common issues include:
- Faulty mode selector switch or wiring
- Hydraulic pump imbalance or wear
- Blocked or leaking pilot lines
- Software calibration errors in electronically controlled systems
Conclusion
Independent travel is a critical feature for excavators performing simultaneous movement and tool operation. By dedicating hydraulic flow to travel motors, it ensures consistent mobility without sacrificing attachment performance. Operators working in trenching, forestry, or utility installation will find this mode invaluable for maintaining control and efficiency. Understanding how and when to activate it—and recognizing signs of malfunction—can significantly improve jobsite productivity and machine longevity.
