CAT 126-3375 Power Supply

CAT 126‑3375 is a panel‑mounted air‑conditioning controller used on Caterpillar excavators (e.g., 330B, 325B). Common failure modes for this unit include tripped or burned‑out relays, failed temperature sensors, and degraded PCB traces due to vibration or moisture ingress. Inspect the power supply rails (24 V DC input) and verify that all relay contacts are clean and fully engaged; check the thermistor/temperature sensor wiring for continuity and correct resistance values; review any stored error codes on the controller display for indications of HVAC loop faults.[oss-gpt-20b]

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We specialize in the repair and refurbishment of high-end industrial control electronics and power systems like this unit.

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🔁 Reliable Turnaround – Most jobs ship within 5–10 business days
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