ABYC Diesel Practice Exam

When an owner complains about needing two hands to operate a single lever control, which technician's recommendation is correct?

1. Technician A, suggesting the cable may be too long and improperly routed

2. Technician B, suggesting that the control head may need cleaning and lubricating

3. Both technicians

4. Neither technician

The correct answer is: Both technicians

The recommendation that both technicians may be correct addresses two potential issues that could contribute to the owner needing two hands to operate a single lever control. When Technician A suggests that the cable may be too long and improperly routed, this highlights a fundamental mechanical aspect of the control system. An excessively long or poorly routed cable can introduce additional friction, resistance, or slack, making it more difficult to smoothly operate the lever. The configuration of the cable plays a crucial role in the efficiency and responsiveness of the control. On the other hand, Technician B's suggestion that the control head may need cleaning and lubricating focuses on the maintenance aspect of the system. Over time, dirt, debris, or corrosion can accumulate, interfering with the mechanism's movement. If the operational components within the control head are not functioning smoothly due to a lack of lubrication or cleanliness, this can also contribute to difficulties in operation. Both of these issues can independently or together result in the owner experiencing the need for two hands to operate a lever designed for single-handed use, demonstrating that both technicians' suggestions are valid and relevant to resolving the complaint.