3E8700 (3E-8700) Caterpillar Coolant Temperature Sensor (Water Temperature Sensor) is compatible with CAT medium-to-large-scale construction machinery and industrial engines; it is a highly reliable, general-purpose wear part. I. Core Parameters (OEM Standard)

Table

Parameter Item | Detailed Specifications

Part Type | NTC Thermistor-type Coolant Temperature Sensor

Measurement Range | -40°C to 135°C / 150°C (Fully covers heavy-duty operating conditions)

Power Supply / Signal | 5V System; 0.5–4.5V Linear Voltage Output

Electrical Interface | 2-pin Sealed Spade Terminal

Mounting Thread | 1/2"-14 NPT (Mainstream); M12×1.5 for select models

Material | Corrosion-resistant Brass Body + High-precision Thermistor Core

Protection Rating | IP67 (Dustproof, Waterproof, Vibration-resistant)

Weight | Approx. 0.1 kg

Resistance Characteristics (Reference) | 25°C ≈ 2.5kΩ; 100°C ≈ 150Ω (NTC: Negative Temperature Coefficient)

II. Applicable Models (Mainstream)

Engines: 3116, 3126/3126B, 3176C, 3306, 3406/B, C4.4

Motor Graders: 120H/K, 12H/K, 135H, 140H/K, 160H/K, 163H

Dozers: D9R

Cold Planers: PM-201, PM-565/B

Wheel Loaders: 980C, 980F

Scrapers: 621G, 623G, 627G, 631G, 637G, 657E

III. Replacements and Interchangeability

Direct OEM Replacement: CA3E8700

Cross-Reference Number: 131-0427 (General replacement with identical function)

V. Fault Diagnosis and Self-Testing

Instrument Panel Anomalies: Coolant temperature gauge is static, readings are inaccurate, or false high-temperature alarms occur.

ECU Fault Codes: Reports faults related to the coolant temperature sensor circuit or performance.

Self-Testing Method: Resistance Measurement (Cold Engine, 25°C): Should be close to 2.5 kΩ; significant deviation indicates a fault.

Voltage Measurement (Hot Engine): At normal operating temperature, the signal should fall within the 1–3 V range.

Check Connector: Inspect for water ingress, corrosion, or looseness.

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