Product Overview

Growshine International supplies the 314-7755, 3147755 Automatic Voltage Regulator (AVR)—a genuine Caterpillar replacement for 3516, 3518, C12 engines and SR4/SR5 generators. Every unit is original, brand new, and sealed for immediate installation, ensuring stable output voltage and longer generator life.

Exact Part Numbers

• 314-7755 (with dash)

• 3147755 (without dash)

• Alternative: CA3147755

Applications

Perfect fit for Caterpillar diesel & gas engines: 3208, 3306, 3406, 3412, 3508, 3512, 3516, 3516B, 3516C, C13, C15, C18, C27, C32, G3306, G3406, G3412, G3516 and generator sets SR4, SR5, SR4B, SR4BHV [^15^][^21^].

Electrical Specs

• Control power: 18-30 VDC, 5 VA

• 1-phase sensing: 100-280 VAC, 50-400 Hz

• 3-phase sensing: 80-280 VAC, 50-400 Hz

• Response time: ≤ 2 ms

Real-World Troubleshooting

Equipment: Caterpillar 3516C marine generator set (S/N JEF00486)

Fault: Intermittent over-voltage alarm, AVR LED flashing red 3 times.

Root cause: Carbon dust bridged the sensing terminal, causing false voltage reading.

Solution: Replaced 314-7755 AVR, cleaned slip rings with 600-grit paper, re-insulated wiring. Load test 0-500 kW passed; voltage stable at 450 V ±0.5 %.

Why the AVR Matters

The automatic voltage regulator is the “brain” that keeps generator output within ±1 % of rated voltage. A worn AVR can spike to >600 V in seconds, destroying sensitive ECMs on modern excavators. Replacing the 314-7755 proactively during every 2 000-hour service prevents costly downtime.

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