| Parameter | Specification |
|---|---|
| Product Name | Revolution Sensor (Engine Speed Sensor) |
| COGENG Part Number | 20482772 |
| OEM Equivalent | Volvo 20482772 |
| 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 | Volvo EC160B, EC180B, EC210B, EC240BLC, EC290BLC 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 | 20482772 |
| Volvo | 20482772 |
| Interchange | 20482773, 20482774, 20482775, 20482776, 20773257 |
| Parameter | Specification |
|---|---|
| Model | Volvo EC160B Excavator |
| Type | 16-ton Crawler Excavator |
| Engine | Volvo D5D |
| Application | Engine speed / crankshaft position monitoring |
| Parameter | Specification |
|---|---|
| Model | Volvo EC180B Excavator |
| Type | 18-ton Crawler Excavator |
| Engine | Volvo D5D / D6D |
| Application | Engine speed / crankshaft position monitoring |
| Parameter | Specification |
|---|---|
| Model | Volvo EC210B Excavator |
| Type | 21-ton Crawler Excavator |
| Engine | Volvo D6D |
| Application | Engine speed / crankshaft position monitoring |
| Parameter | Specification |
|---|---|
| Model | Volvo EC240BLC Excavator |
| Type | 24-ton Crawler Excavator (Long Track) |
| Engine | Volvo D7D |
| Application | Engine speed / crankshaft position monitoring |
| Parameter | Specification |
|---|---|
| Model | Volvo EC290BLC Excavator |
| Type | 29-ton Crawler Excavator (Long Track) |
| Engine | Volvo D7D |
| Application | Engine speed / crankshaft position monitoring |
| 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) |
Frequently Asked Questions
Q: What Volvo models use the 20482772 revolution sensor?
A: The COGENG 20482772 revolution sensor is a direct OEM replacement specifically designed for Volvo EC210B and EC240BLC excavator models. It may also be compatible with other Volvo B Series equipment where this sensor part number is specified. This sensor monitors engine rotational speed and provides critical RPM data to the engine ECU. Always verify this part number against your machine's parts manual or the original sensor's identification markings to confirm exact compatibility before ordering.
Q: What are the symptoms of a failing revolution sensor on a Volvo EC210B or EC240BLC?
A: Common symptoms include engine stalling or failure to start, intermittent engine shutdowns, erratic or incorrect RPM readings on the display panel, rough running or misfiring, active diagnostic trouble codes related to the engine speed sensor circuit, the engine entering a derate or limp mode, or loss of throttle response. Volvo B Series excavators rely heavily on accurate RPM data for engine and hydraulic management, so a faulty sensor should be replaced promptly.
Q: How does the revolution sensor affect engine and machine operation?
A: The revolution sensor continuously monitors engine rotational speed (RPM) and transmits real-time data to the engine ECU. This critical information is used to control fuel injection timing, fuel delivery quantity, engine protection functions, and hydraulic pump power matching. Without accurate RPM data, the ECU cannot properly manage combustion or coordinate engine and hydraulic performance.
Q: Is this sensor a direct plug-and-play replacement?
A: Yes, the COGENG 20482772 revolution sensor is manufactured to exact OEM specifications for thread size, electrical connector type, signal output characteristics, and mounting dimensions. It is a direct plug-and-play replacement requiring no wiring modifications or adapters when installed on compatible Volvo EC210B or EC240BLC excavator models.
Q: What is the warranty coverage for this revolution sensor?
A: COGENG provides a standard 12-month warranty against manufacturing defects from the date of installation. Proof of purchase and installation by a qualified technician are required. Warranty does not cover failure caused by improper installation, wiring damage, physical impact, overtightening, thread damage, or use on incompatible equipment.
Q: What should I check before installing the new revolution sensor?
A: Before installation, inspect the sensor mounting port for debris or damage, check the electrical connector for corrosion, and ensure proper torque is applied as specified by the service manual to prevent thread damage or incorrect sensor air gap. Verify the wiring harness is in good condition to prevent signal interference.
Q: Does COGENG offer technical support for installation or troubleshooting?
A: Yes, COGENG provides complimentary technical support to assist with installation guidance and basic troubleshooting. For complex engine diagnostics on Volvo excavators, we recommend consulting a certified Volvo service technician.
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