The 803825032 Resistive Transmission Oil Pressure Sensor is a genuine OEM component manufactured by XCMG for heavy‑duty motor graders and construction machinery. This sensor provides a variable resistance output proportional to transmission oil pressure, used by the electronic control unit for shift management and clutch protection.
Engineered to survive extreme vibration, high temperatures, and aggressive oil additives, the 803825032 sensor features a rugged 1/8″ NPT thread and a sealed two‑pin connector. It directly replaces failed resistive‑type pressure sensors on XCMG GR series graders and compatible transmissions.
Each unit is factory‑calibrated to deliver precise resistance changes from 240 ohms at 0 psi down to 33 ohms at 150 psi, ensuring the transmission control module receives accurate pressure data for smooth shifts and extended component life.
| Parameter | Specification |
|---|---|
| OEM Number | 803825032 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Resistive Transmission Oil Pressure Sensor |
| Thread Size | 1/8″ NPT |
| Pressure Range | 0 to 150 psi (0 to 10.3 bar) |
| Output Type | Variable resistance (two‑wire) |
| Resistance at 0 psi | 240 Ω ±10% |
| Resistance at 150 psi | 33 Ω ±5% |
| Supply Voltage | 5V DC or 12V (pull‑up resistor required) |
| Accuracy | ±2% full scale (at 25°C) |
| Response Time | < 3 ms |
| Operating Temperature | -40°C to +125°C |
| Media Compatibility | Transmission oil, hydraulic oil, engine oil |
| Proof Pressure | 300 psi (2x rated range) |
| Burst Pressure | 450 psi |
| Connector Type | Two‑pin sealed (Packard / Metri‑Pack 150) |
| Housing Material | Brass with nickel plating + high‑temp plastic |
| IP Rating | IP67 (mated) |
| Vibration Resistance | 15g (10‑2000Hz) |
| Compatible Models | XCMG GR135, GR165, GR215, GR300, GR350 motor graders |
The XCMG 803825032 Resistive Transmission Oil Pressure Sensor uses a piezoresistive element that changes its electrical resistance as pressure deforms a diaphragm. The transmission control unit (TCU) supplies a fixed voltage through a pull‑up resistor and measures the voltage drop across the sensor.
At 0 psi (transmission not running or in neutral), resistance is high (≈240Ω), producing a high voltage reading. As pressure rises during clutch engagement, resistance drops to as low as 33Ω at 150 psi. This analog signal allows the TCU to modulate shift solenoids for smooth, firm shifts.
Unlike on/off pressure switches, the 803825032 provides continuous feedback, enabling the TCU to detect pressure decay, line pressure faults, and clutch wear patterns. This data is essential for preventative maintenance alerts.
The 803825032 sensor mounts directly into the transmission valve body or main pressure test port. The thread is 1/8″ NPT, identical to the original. The two‑pin connector is keyed and color‑coded (usually black/white or black/green) to prevent misconnection.
Installation: remove the old sensor, clean the port, apply a small amount of thread sealant (do not use Teflon tape, as it can shred and clog valve orifices). Torque to 12‑15 Nm. Reconnect the harness. No calibration is required because the TCU reads the raw resistance and maps it internally.
Common failure symptoms: transmission fault codes (e.g., “Pressure Sensor Circuit High/Low”), erratic shifting, harsh engagement, or the transmission staying in neutral. Replacing with genuine 803825032 resolves these issues immediately.
The 803825032 sensor is built to survive the harshest conditions in mining, road construction, and agriculture. XCMG subjects each batch to 500 hours of oil immersion at 120°C, followed by 100 thermal shock cycles from -40°C to +130°C. No drift beyond ±1% resistance is allowed.
The brass housing is nickel‑plated to resist corrosion from acidic transmission fluid and road salt. The internal ceramic substrate and thick‑film resistor elements are overmolded with high‑temperature epoxy, eliminating failure from vibration or moisture ingress.
Additionally, the sensor withstands 20g vibration for 24 hours across 10‑2000Hz, simulating the most severe grader operation. This ensures long‑term reliability and prevents unexpected breakdowns.
Aftermarket resistive sensors often have incorrect resistance curves (non‑linear) or poor temperature compensation, leading to false pressure readings and transmission damage. The genuine XCMG part is matched exactly to the TCU’s internal lookup table, ensuring perfect correlation.
Counterfeit sensors may also use low‑grade rubber seals that harden and leak after a few months, causing external oil drips and pressure loss. The OEM 803825032 uses Viton® O‑rings rated for 150°C continuous, eliminating leaks.
XCMG provides a 12‑month unlimited‑hour warranty. Each sensor is laser‑etched with the XCMG logo and part number. This supersedes older numbers 803824901, 803825011, and 803825115.
To test the 803825032 sensor, disconnect it from the harness and measure resistance between the two terminals using an ohmmeter. At room temperature with no pressure, you should see approximately 240Ω. Apply compressed air (regulated to 100 psi) through a fitting – resistance should drop to around 65‑70Ω.
If resistance is open circuit (infinite) or short circuit (0Ω), the sensor is defective and must be replaced. Also check for resistance fluctuation when tapping the sensor – unstable readings indicate internal damage. Always replace in pairs if both main and lockup pressure sensors are used.
For fleet managers, stocking spare 803825032 sensors prevents costly downtime. A single failed sensor can trigger a transmission fault that limits speed or disables gears. Keep your graders operating with genuine XCMG parts.
The 803825032 Resistive Transmission Oil Pressure Sensor is stocked in XCMG’s distribution centers in the USA, Germany, UAE, Singapore, and Brazil. Standard air freight delivers within 3‑7 business days worldwide. Expedited shipping (1‑2 days) is available for urgent breakdowns.
Bulk orders (10+ units) receive discounted pricing and can be shipped via sea freight. Each sensor is individually sealed in anti‑static bags with desiccant. For large fleets, consignment stock programs are available to ensure immediate availability.
Don’t compromise on transmission reliability. Order the genuine XCMG 803825032 sensor today and experience the quality that keeps your motor graders productive and safe.
Upgrading to a new resistive pressure sensor restores the transmission’s ability to shift correctly under all load conditions. The 803825032 is the definitive replacement for any XCMG GR series motor grader produced after 2008. Keep your machine running at peak efficiency.
Choose XCMG genuine parts for guaranteed fit, performance, and durability. The 803825032 Resistive Transmission Oil Pressure Sensor – precision engineered for the toughest jobs.
