case studies
Following a hydraulic fault beyond the control code
A mechanism moved down but would not return. Control evidence helped focus the investigation on likely hydraulic causes.
A useful diagnosis considers the physical system as well as its software.
The challenge
In an infrastructure-services field test, a tilt mechanism moved down but would not return in Float mode. The engineer needed to establish whether the control logic explained the one-way movement.
What we tested
Agent Rung reviewed the output, interlocks and Float Tilt logic. Its recorded analysis found the output was on and no directional logic explained the missing return movement.
The next line of investigation
The response identified likely valve and fluid-return causes, naming the valve, pilot pressure and return path for qualified engineering verification. Load-support, pressure and isolation warnings remained alongside the diagnostic reasoning.
Reported outcome
The field tester reported that Rung’s answer was correct. The case illustrates how control evidence and physical-system reasoning can inform the next engineering check.