| Parameter | Specification |
|---|---|
| Product Name | Hyundai Pressure Sensor |
| COGENG Part Number | 31Q4-40830 |
| OEM Equivalent | Hyundai 31Q4-40830 |
| Product Type | Hydraulic Pressure Sensor |
| Sensor Type | Piezoresistive pressure transducer |
| Output Type | 4-20 mA or 0.5-4.5V (application dependent) |
| Application | Hydraulic system pressure monitoring |
| Compatible Models | Hyundai R140W-9, R170W-9, R180W-9 Wheel Excavators |
| Material | Iron + Rubber (seals: NBR / FKM) |
| 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 | 31Q4-40830 |
| Hyundai | 31Q4-40830 |
| Interchange | 31Q4-40831, 31Q4-40832, 31Q4-40833 |
| Parameter | Specification |
|---|---|
| Supply Voltage | 8-36V DC (typically 24V system) |
| Output Signal | 4-20 mA (current loop) or 0.5-4.5V analog |
| Current Draw | ≤ 25 mA |
| Response Time | < 5 ms |
| Insulation Resistance | ≥100MΩ @ 500V DC |
| Reverse Polarity Protection | Yes |
| Overvoltage Protection | Yes |
| Parameter | Specification |
|---|---|
| Pressure Range | 0 - 350 bar (0 - 5,075 psi) typical |
| Measurement Type | Gauge pressure (relative to atmosphere) |
| Accuracy | ±1.0% to ±2.0% of full scale |
| Overpressure Limit | 525 bar (7,600 psi) |
| Burst Pressure | 875 bar (12,700 psi) |
| Compensated Temperature | -40°C to +105°C |
| Parameter | Specification |
|---|---|
| Connector Type | 3-pin Deutsch DT / AMP |
| Mounting Thread | 7/16-20 UNF or M12 × 1.5 (OEM spec) |
| Hex Size | 19 mm (3/4") or 22 mm (7/8") |
| Housing Material | Stainless steel / Zinc-nickel plated steel |
| Diaphragm Material | 17-4PH stainless steel |
| Seal Material | NBR / FKM (Viton) |
| Weight | 0.10 - 0.15 kg (0.22 - 0.33 lbs) |
| Overall Length | 55-65 mm |
| Pin | Function | Signal Type | Wire Color (Typical) |
|---|---|---|---|
| Pin 1 | Sensor Supply (+) | 24V DC | Red |
| Pin 2 | Sensor Signal | 4-20 mA or 0.5-4.5V | Yellow/White |
| Pin 3 | Sensor Ground (-) | 0V | Black |
| Pressure (bar) | Pressure (psi) | Output (mA) | Condition |
|---|---|---|---|
| 0 | 0 | 4.0 ±0.1 | No pressure |
| 87.5 | 1,269 | 8.0 ±0.1 | Low pressure |
| 175 | 2,538 | 12.0 ±0.1 | Medium pressure |
| 262.5 | 3,806 | 16.0 ±0.1 | High pressure |
| 350 | 5,075 | 20.0 ±0.1 | Maximum pressure |
| Pressure (bar) | Pressure (psi) | Output (V) | Condition |
|---|---|---|---|
| 0 | 0 | 0.5 ±0.1 | No pressure |
| 87.5 | 1,269 | 1.5 ±0.1 | Low pressure |
| 175 | 2,538 | 2.5 ±0.1 | Medium pressure |
| 262.5 | 3,806 | 3.5 ±0.1 | High pressure |
| 350 | 5,075 | 4.5 ±0.1 | Maximum pressure |
| Parameter | Rating |
|---|---|
| Operating Temperature | -40°C to +105°C (-40°F to +221°F) |
| Storage Temperature | -40°C to +125°C (-40°F to +257°F) |
| Ingress Protection | IP67 / IP69K (connector mated) |
| Vibration Resistance | 20G @ 50-2000Hz |
| Shock Resistance | 100G |
| Media Compatibility | Hydraulic oil, diesel fuel |
| Corrosion Protection | 500+ hours salt spray |
| Parameter | Specification |
|---|---|
| Model | Hyundai R140W-9 Wheel Excavator |
| Type | 14-ton Wheel Excavator |
| Series | Dash 9 |
| Application | Hydraulic system pressure monitoring |
| Parameter | Specification |
|---|---|
| Model | Hyundai R170W-9 Wheel Excavator |
| Type | 17-ton Wheel Excavator |
| Series | Dash 9 |
| Application | Hydraulic system pressure monitoring |
| Parameter | Specification |
|---|---|
| Model | Hyundai R180W-9 Wheel Excavator |
| Type | 18-ton Wheel Excavator |
| Series | Dash 9 |
| Application | Hydraulic system pressure monitoring |
| Application | Pressure Range | Function |
|---|---|---|
| Main Pump Pressure | 0-350 bar | Monitors main hydraulic pump output |
| Implement Pressure | 0-350 bar | Monitors boom/arm/bucket circuits |
| Pilot Pressure | 0-50 bar | Monitors pilot control pressure |
| Swing Circuit | 0-350 bar | Monitors swing brake/pressure |
| Travel Circuit | 0-350 bar | Monitors wheel travel motor pressure |
| Steering Circuit | 0-200 bar | Monitors steering system pressure |
Q: What Hyundai models use the 31Q4-40830 pressure sensor?
A: The COGENG 31Q4-40830 pressure sensor is a direct OEM replacement specifically designed for Hyundai R140W-9, R170W-9, and R180W-9 wheel excavator models. This sensor is typically used in the hydraulic system for monitoring critical pressure circuits such as pump discharge pressure, pilot pressure, or other hydraulic control functions. 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 pressure sensor on a Hyundai wheel excavator?
A: Common symptoms include inaccurate or erratic pressure readings on the monitor panel, active diagnostic trouble codes related to the pressure sensor circuit, degraded hydraulic performance or unexpected power reduction, the machine entering a failsafe or limp mode, intermittent hydraulic function response, or the engine control system failing to properly match engine speed to hydraulic load demand. A faulty pressure sensor can significantly impact overall machine performance, digging force, and fuel efficiency.
Q: How does the pressure sensor affect excavator operation?
A: The 31Q4-40830 sensor provides real-time hydraulic pressure data to the machine's electronic control system. This information is used to manage pump displacement, engine speed matching, and implement response. Accurate pressure sensing is essential for smooth hydraulic operation, preventing system overloads, and optimizing fuel consumption on Dash-9 series wheel excavators.
Q: Is this sensor a direct plug-and-play replacement?
A: Yes, the COGENG 31Q4-40830 pressure sensor is manufactured to exact OEM specifications for thread size, electrical connector type, pressure range, output signal characteristics, and response time. It is a direct plug-and-play replacement requiring no wiring modifications or adapters when installed on compatible Hyundai R140W-9, R170W-9, or R180W-9 wheel excavator models.
Q: What is the warranty coverage for this pressure 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 hydraulic fluid contamination, over-pressurization, improper installation, overtightening, thread damage, or use on incompatible equipment.
Q: What should I check before installing the new pressure sensor?
A: Before installation, verify the hydraulic system is fully depressurized, inspect the sensor mounting port for debris or damage, check the electrical connector for corrosion, and apply the appropriate thread sealant if specified by the service manual. Torque the sensor to manufacturer specifications to prevent thread damage or hydraulic leaks. Contaminated hydraulic fluid can damage the new sensor, so verify fluid cleanliness and replace hydraulic filters if necessary.
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 hydraulic system diagnostics on Hyundai wheel excavators, we recommend consulting a certified Hyundai service technician.
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