Field case study · Salt Lake City, UT
Komatsu PC200 no-start diagnostic — Salt Lake City, UT
Interior excavator crank-no-start at an I-15 industrial corridor site.
Reported symptom
Machine cranked but would not start. No fault codes displayed on the dash panel. Operator reported intermittent shutdowns over the previous week.
Diagnostic finding
Failed fuel priming pump causing air ingestion in the fuel system. Secondary issue: clogged fuel filter with water contamination from a bad fuel supply.
Repair scope
Replaced the electric fuel priming pump. Drained and replaced both fuel filters. Primed and bled the system, then test-ran the machine through a full warm-up cycle.
Reported result
Engine started on the first crank. No further air ingestion issues. Operator was back to trenching by mid-afternoon. Water contamination noted for future fuel supply monitoring.
What this case helps clarify
This job is a useful example of why the first reported symptom is only the starting point. The machine type, brand, location, operating conditions, and observed diagnostic finding all shape the repair path. A similar complaint on another model may require a different test sequence or a different field-versus-shop decision.
For a new service request, send the machine make and model, hours if known, warning codes or dashboard photos, the conditions that trigger the problem, and the safest access point at the jobsite. That information helps the technician prepare the right tools and determine whether the work can be performed where the machine sits.
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