Overview
The ZF 4661.125.008 INDUCTIVE SENSOR is a critical electronic component engineered specifically for the WG 94 series transmission. This OEM genuine part monitors rotational speed and position of internal shafts by generating a magnetic field that detects ferrous targets without physical contact. Installed within the valve body or housing assembly, the sensor transmits real-time data to the transmission control unit (TCU) to optimize shift timing and clutch engagement. The SKU 4661.125.008 ensures precise signal output, directly influencing gear selection accuracy and overall driveline efficiency. When paired with the 4661101046 HOUSING and the 4661301125 HOUSING II, this sensor forms a sealed, vibration-resistant assembly that withstands harsh transmission environments.
Symptoms of Failure
- Erratic gear shifting or delayed engagement: A failing 4661.125.008 sensor sends intermittent or incorrect speed signals, causing the TCU to misjudge vehicle load and road speed, leading to harsh or missed shifts.
- Transmission enters limp mode without warning: When the inductive sensor fails completely, the system defaults to a safe mode, locking the transmission in a single gear (often 3rd or 4th) to prevent damage.
- Inaccurate speedometer or tachometer readings: Since the sensor provides input for output shaft speed, a worn unit can cause the dashboard gauges to fluctuate or show zero speed while driving.
- Increased fuel consumption and overheating: Faulty data from the sensor forces the transmission to operate inefficiently, causing torque converter slip and elevated fluid temperatures.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4661.125.008 |
| Type | Inductive Proximity Sensor (2-wire) |
| Operating Voltage | 10–30 V DC |
| Output Signal | Frequency/ Pulse (NPN normally open) |
| Housing Material | Stainless steel (V2A) with PBT sensing face |
| Thread Size | M12 x 1.0 |
| Overall Length | 45 mm (including connector) |
| Weight | 0.035 kg (35 g) |
| OEM Reference | ZF 4661.125.008 |
| Protection Class | IP67 (oil and dust resistant) |
| Operating Temperature | -25°C to +125°C |
Compatibility
This inductive sensor is primarily designed for the ZF WG 94 series, but its mounting pattern and electrical characteristics also suit other ZF powershift transmissions. Compatible models include the WG180, WG200, WG211, and WG240 series used in construction, agricultural, and material handling equipment. The sensor replaces OEM part 4661.125.008 and is directly interchangeable with earlier revisions. For proper installation, ensure the 0631306174 CYLINDRICAL PIN is correctly aligned to prevent sensor damage, and verify the 0769123894 TYPE PLATE matches your transmission model for exact fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101046 | HOUSING | Encloses and protects the sensor assembly |
| 4661301125 | HOUSING II | Secondary housing for additional sensor mounting |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise sensor positioning |
| 0769123894 | TYPE PLATE | Identification plate with transmission model data |
| 0750100022 | SCREW PLUG | Seals unused sensor ports |
| 4660201008 | SCREW PLUG | Oil drain or test port plug |
| 0636100117 | SCREW PLUG | Magnetic plug for debris collection |
| 0501211384 | VALVE | Modulates hydraulic pressure to clutches |
| 0732042156 | COMPRESSION SPRING | Provides return force for valve spools |
| 0768409154 | SCREW PLUG | High-pressure port sealing plug |
