Overview
The ZF 4661.125.007 INDUCTIVE SENSOR is a critical electronic component engineered specifically for the WG 94 Series powershift transmissions. This OEM genuine part monitors rotational speed and position of internal shafts, sending real-time data to the transmission control unit (TCU) to ensure precise gear engagement and clutch modulation. Mounted directly into the TRANSMISSION HOUSING, the sensor detects ferrous targets without physical contact, eliminating wear common in mechanical switches. The SKU 4661.125.007 is the direct replacement for original equipment, guaranteeing factory-specified signal accuracy and thermal stability under high-load conditions.
Symptoms of Failure
- Erratic gear engagement or delayed shifting: A failing inductive sensor sends intermittent or false signals, causing the TCU to hesitate or skip gears, especially under load.
- Transmission stuck in limp mode: When the sensor fails completely, the system defaults to a reduced power state (limp mode) to prevent internal damage, often accompanied by a dashboard warning light.
- Incorrect speed readings on diagnostic tools: Technicians may notice fluctuating or zero RPM values for the output shaft during live data scans, directly traceable to a degraded 4661.125.007 sensor.
- Oil contamination from seal breach: Although rare, a cracked sensor housing can allow transmission fluid to leak into the electrical connector, causing short circuits and visible oil residue near the HOUSING II interface.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4661.125.007 |
| Type | Inductive Proximity Sensor (2-wire) |
| Operating Voltage | 10–30 V DC |
| Output Signal | Frequency pulse (square wave) |
| Housing Material | Stainless steel (V2A) with PA12 plastic cap |
| Thread Size | M12 x 1.5 |
| Overall Length | 50 mm |
| Weight | 0.04 kg (40 g) |
| OEM Reference | ZF 4661.125.007 |
| Seal Type | O-ring (NBR, included) |
Compatibility
This inductive sensor is a direct fit for the WG 94 Series family of ZF transmissions, which includes models such as the WG94, WG180, WG200, and WG250. It is also commonly used in the WG 98 Series and certain Ecomat 4HP/5HP variants that share the same sensor mounting boss. Always verify the sensor location within the TRANSMISSION HOUSING and ensure the CYLINDRICAL PIN alignment is correct during installation. For identification purposes, the TYPE PLATE on your transmission will confirm the exact series compatibility.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101042 | TRANSMISSION HOUSING | Main structural casing that houses the sensor and gear train |
| 4661301108 | HOUSING II | Secondary housing section supporting the output shaft sensor target |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise sensor-to-target gap |
| 0769123894 | TYPE PLATE | Identification plate with transmission model and serial number |
| 0750100022 | SCREW PLUG | Seals unused sensor ports in the housing |
| 4660201008 | SCREW PLUG | Oil drain or fill plug for the main housing |
| 0636100117 | SCREW PLUG | Magnetic plug for ferrous debris collection |
| 0501211384 | VALVE | Hydraulic control valve for clutch modulation |
| 0732042156 | COMPRESSION SPRING | Returns valve spool to neutral position |
| 0768409154 | SCREW PLUG | High-pressure port plug for test points |
