| Parameter | Specification |
|---|---|
| Product Name | Speed Sensor / RPM Revolution Sensor |
| COGENG Part Number | 125-2966 (1252966) |
| OEM Equivalent | Caterpillar 125-2966, 1252966 |
| Product Type | Magnetic Pickup / Inductive Speed Sensor |
| Sensor Type | Variable reluctance (magnetic) |
| Output Signal | AC voltage (frequency proportional to engine speed) |
| Application | Engine RPM monitoring / Crankshaft position |
| Compatible Models | Caterpillar 320C, E312C Excavators |
| Material | Iron + Rubber (seals: NBR) |
| Packing | PP bag inside, carton box outside |
| Place of Origin | Guangdong, China |
| Brand Name | COGENG |
| Certification | ISO9001 |
| Supply Capacity | 500 PCS |
| Brand | Part Number |
|---|---|
| COGENG | 125-2966, 1252966 |
| Caterpillar | 125-2966, 1252966 |
| Interchange | 125-2965, 125-2967, 125-2968, 125-2969 |
| Model | Series | Engine | Application |
|---|---|---|---|
| 320C | C-Series | CAT 3066 / C6.4 | Speed / RPM sensor |
| 320C L | C-Series | CAT 3066 / C6.4 | Speed / RPM sensor |
| 320C LU | C-Series | CAT 3066 / C6.4 | Speed / RPM sensor |
| 320C U | C-Series | CAT 3066 / C6.4 | Speed / RPM sensor |
| Model | Series | Engine | Application |
|---|---|---|---|
| E312C | C-Series | CAT 3054 / 3114 | Speed / RPM sensor |
| E312C L | C-Series | CAT 3054 / 3114 | Speed / RPM sensor |
| Model | Series | Compatibility |
|---|---|---|
| 320B | B-Series | Verify fitment |
| 322C | C-Series | Verify fitment |
| 325C | C-Series | Verify fitment |
| 330C | C-Series | Verify fitment |
Note: Verify compatibility with your equipment model, engine serial number, and production year before ordering. Contact COGENG with your machine details for exact application verification.
| Component | Function |
|---|---|
| Sensor Type | Variable reluctance (magnetic pickup) |
| Target | Flywheel ring gear teeth or crankshaft tone wheel |
| Output | AC voltage sine wave (frequency = engine RPM × number of teeth) |
| ECU Use | Engine speed calculation, fuel injection timing, protection |
| Engine Speed (RPM) | Output Voltage (AC) | Frequency (Hz) |
|---|---|---|
| Cranking (200 RPM) | 0.5 - 1.5 V | Low frequency |
| Idle (800 RPM) | 2.0 - 4.0 V | Medium frequency |
| Working (1,500 RPM) | 4.0 - 8.0 V | Higher frequency |
| Rated (2,200 RPM) | 6.0 - 12.0 V | High frequency |
| Function | Description |
|---|---|
| Engine RPM Display | Provides signal to tachometer (dash display) |
| Fuel Injection Timing | ECU uses speed signal for timing calculation |
| Engine Protection | Over-speed detection and derate |
| Starting Control | Starting motor disengagement signal |
| Diagnostics | Speed sensor fault detection (DTC) |
| Parameter | Specification |
|---|---|
| Sensor Type | Variable reluctance (magnetic pickup) |
| Output Signal | AC voltage (sine wave) |
| Output Voltage (min) | 1.0 V AC @ 200 RPM |
| Output Voltage (typical) | 2-12 V AC (engine speed dependent) |
| Coil Resistance | 200 - 500 Ω @ 20°C |
| Inductance | 100 - 300 mH |
| Air Gap | 0.5 - 1.5 mm (0.020 - 0.060 in) |
| Connector Type | 2-pin Deutsch / AMP |
| Parameter | Specification |
|---|---|
| Housing Material | Zinc-plated steel / Stainless steel |
| Thread Size | M14 × 1.5 |
| Hex Size | 17 mm (11/16") or 19 mm (3/4") |
| Seal Material | NBR (oil resistant) |
| Weight | 0.06 - 0.10 kg (0.13 - 0.22 lbs) |
| Overall Length | 50-70 mm |
| Tip Material | Magnetic steel |
| Pin | Function | Signal Type |
|---|---|---|
| Pin 1 | Signal (+) | AC voltage (variable frequency) |
| Pin 2 | Signal (-) / Shield | Ground / Shield |
| Warning | Detail |
|---|---|
| Engine hazard | Engine may start unexpectedly during testing. Keep clear of fan, belts, pulleys. |
| Hot surfaces | Allow engine to cool before touching. |
| Electrical | Disconnect battery before working on electrical system. |
| Flying debris | Wear safety glasses. |
| Moving parts | Keep hands clear of flywheel area. |
| Air gap | Incorrect air gap can cause sensor damage or no signal. |
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