Overview
The ZF 4616.125.008 INDUCTIVE SENSOR is a critical electronic component designed specifically for the WG 65 series of heavy-duty transmissions. This OEM genuine part monitors rotational speed and position of internal shafts by generating a magnetic field that detects metallic targets without physical contact. Installed within the transmission housing, the sensor relays real-time data to the transmission control unit (TCU), enabling precise shift timing and clutch engagement. The SKU 4616.125.008 ensures direct replacement compatibility, restoring factory-level performance and preventing erratic gear behavior. When paired with a robust TRANSMISSION HOUSING, this sensor maintains signal integrity even under high-vibration conditions common in construction and agricultural machinery.
Symptoms of Failure
- Erratic gear shifting or delayed engagement – A failing inductive sensor sends intermittent or false signals to the TCU, causing the transmission to hunt for gears or hesitate during acceleration. This is often searched as “transmission shifting problems ZF WG65.”
- Transmission warning light on dashboard – The TCU detects missing or implausible speed data from the 4616.125.008, triggering a diagnostic trouble code (DTC) and illuminating the check engine or transmission warning lamp.
- Intermittent loss of reverse gear – When the sensor fails to detect output shaft rotation, the control module may inhibit reverse operation as a safety measure, a symptom commonly described as “ZF transmission no reverse after sensor failure.”
- Harsh or jarring clutch engagements – Without accurate speed feedback, the TCU applies clutches too aggressively, leading to noticeable shuddering or banging during low-speed maneuvers.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4616.125.008 |
| Type | Inductive Proximity Sensor (2-wire) |
| Operating Voltage | 10–30 VDC |
| Output Signal | Frequency / Pulse (NPN NO) |
| Housing Material | Stainless Steel (V2A) |
| Thread Size | M12 x 1.5 |
| Overall Length | 55 mm |
| Weight | 0.04 kg (40 g) |
| OEM Reference | ZF 4616.125.008 |
| Protection Class | IP67 |
Compatibility
This inductive sensor is engineered for the ZF WG 65 series, including models such as WG65, WG70, and WG80. It also fits select WG180 and WG200 variants where the speed sensor mounting boss uses an M12 thread. Always verify the sensor port location within the HOUSING assembly before installation. For transmissions with a HOUSING revision after 2015, confirm that the sensor bore depth matches the 55 mm probe length. The 4616.125.008 replaces earlier part numbers 4616.125.005 and 4616.125.007 without modification.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101101 | TRANSMISSION HOUSING | Main structural casing that encloses gears and shafts |
| 0636011118 | HEXAGON SCREW | Secures housing halves together |
| 4616301304 | HOUSING | Intermediate housing for valve body or sensor mount |
| 4616301309 | HOUSING | Rear housing adapter for output flange |
| 0630361069 | SEALING CAP | Protects unused sensor ports from debris |
| 0636011038 | HEXAGON SCREW | Fastens sensor bracket to housing |
| 0636016015 | HEXAGON SCREW | M10 bolt for clutch pack retention |
| 0631306085 | CYLINDRICAL PIN | Aligns housing sections during assembly |
| 0634313118 | O-RING | Seals sensor-to-housing interface |
| 0636304019 | SCREW PLUG | Closes oil drain or test ports |
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