Overview
The ZF 4646.125.023 INDUCTIVE SENSOR is a critical OEM sub-assembly component designed for precise rotational speed and position monitoring within the WG 250, WG 260, and WG 310 series transmissions. This non-contact sensor detects ferrous targets on the transmission shaft or gear train, converting magnetic field changes into electrical signals for the control unit. Proper signal integrity from part number 4646.125.023 ensures accurate shift timing and clutch modulation. It is typically mounted in the transmission housing near the output shaft, where it interfaces with the valve body and electronic control module. For secure installation, always pair this sensor with the correct 0636115293: 螺栓 and 0736300232: 螺栓 to maintain proper torque and vibration resistance.
Symptoms of Failure
- Erratic or delayed gear engagement – When the inductive sensor fails, the transmission control unit receives intermittent or no speed data, causing harsh shifts or failure to engage a gear.
- Transmission stuck in limp mode – A degraded sensor often triggers a fault code, forcing the transmission into a reduced-power safety mode with limited gear access.
- Incorrect speedometer or tachometer readings – Since this sensor provides input for vehicle speed calculation, a failing unit results in erratic or zero speed display on the dashboard.
- No start condition – In some ZF configurations, a failed sensor prevents the transmission from signaling the engine control unit, blocking engine cranking.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4646.125.023 |
| Sensor Type | Inductive (passive, 2-wire) |
| Housing Material | Stainless steel / Thermoplastic composite |
| Thread Size | M12 x 1.5 |
| Overall Length | 45 mm |
| Weight | Approx. 35 g |
| Operating Voltage | 5–24 V DC |
| OEM Reference | ZF 4646.125.023 |
| Sealing Requirement | Use 0634316523: O-RING for housing seal |
| Mounting Hardware | 4475280208: SCREW PLUG (optional retention) |
Compatibility
This inductive sensor is engineered for the ZF WG series powershift transmissions. It is a direct replacement for units in the WG 250, WG 260, WG 261, WG 310, and WG 311 series. These transmissions are commonly found in heavy-duty construction equipment, agricultural tractors, and material handlers. The sensor also fits select WG 180 and WG 200 variants where the speed pickup port matches the M12 thread pattern. Always verify the air gap specification (typically 0.5–1.5 mm) during installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0636115293 | 螺栓 | Mounting bolt for sensor bracket |
| 0736300232 | 螺栓 | Secondary fastening bolt |
| 4475280208 | SCREW PLUG | Seals unused sensor port |
| 0634316523 | O-RING | Sensor housing seal |
| 0630361026 | SEALING CAP | Protects sensor connector |
| 0501214611 | 齿轮泵 | Hydraulic pump for clutch actuation |
| 0634313945 | O形圈 | Hydraulic circuit seal |
| 0501322534 | TEMPERATURE SENSOR | Monitors transmission oil temperature |
| 0634313366 | O-RING | Temperature sensor seal |
| 4646130044 | ENGINE CONNECTION | Interface harness to engine ECU |
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