Hitachi Fault Code

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11901-3

Limp Mode / Overheating.

System

Hydraulics (Temp)

Symptom

Limp Mode / Overheating.

Diagnosis & fix steps

LOGIC: Hydraulic Oil Temp Sensor voltage abnormal. ACTION: Clean the hydraulic cooler with an air comb. If the cooler is clean, check the sensor resistance.

Red Seal field insights

Specs: At 50°C (122°F), sensor resistance should be approx. 2.4k Ohms. Hint: Hitachi rigs work in dusty sites; mud "films" the radiator fins, hiding the blockage from a quick glance.

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