Caterpillar Fault Code

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2266-7

Erratic Main Pump Response

Variant 1

System

Hydraulic

Symptom

Erratic Main Pump Response

Diagnosis & fix steps

LOGIC: Pump #2 Outlet Pressure Sensor Not Responding. ACTION: Perform "Pressure Sensor Calibration" in CAT ET. If it fails, check for a blocked sensor orifice.

Red Seal field insights

Specs: Signal should be 0.5V at rest (atmospheric) and up to 4.5V at full stroke.

Variant 2

System

Hydraulic

Symptom

Pump #2 Outlet Pressure Sensor: Not Responding

Diagnosis & fix steps

LOGIC: Static signal on Pump 2. ACTION: Check for air in the pilot lines or a failed transducer internal diaphragm.

Red Seal field insights

Usually caused by a "slug" of debris or air lock after a hose replacement.

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