Overview
The ZF 4656.125.009 INDUCTIVE SENSOR is a critical electronic component engineered for the WG 171 series transmission. This OEM genuine part monitors rotational speed and position of internal shafts, sending precise signals to the transmission control unit to manage shift timing and clutch engagement. Positioned directly within the valve body or housing assembly, the sensor ensures accurate data feedback for optimal gear selection. The SKU 4656.125.009 is manufactured to ZF’s exacting tolerances, guaranteeing seamless integration with your existing system.
Symptoms of Failure
- Erratic shifting or gear hunting: When the 4656.125.009 inductive sensor fails, the transmission may struggle to find the correct gear, causing sudden upshifts or downshifts during normal driving.
- Transmission stuck in limp mode: A worn sensor often triggers a fault code, forcing the transmission into a reduced-power limp mode to prevent damage.
- No reverse engagement: Loss of speed signal from the sensor can prevent the control unit from engaging reverse gear, leaving the vehicle unable to back up.
- Intermittent loss of power: As the sensor degrades, you may experience brief power cuts or hesitation under load, especially when climbing grades.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4656.125.009 |
| Type | Inductive Proximity Sensor |
| Operating Voltage | 10–30 VDC |
| Output Signal | Digital (NPN/PNP) |
| Housing Material | Stainless Steel / Brass |
| Thread Size | M12 x 1.0 |
| Length | 50 mm |
| Weight | 0.04 kg |
| OEM Reference | ZF 4656.125.009 |
Compatibility
This inductive sensor is primarily designed for the WG 171 series, but it also fits other ZF commercial transmissions that share the same sensor port configuration. Compatible models include the WG 180, WG 200, and WG 150 series. Always verify your transmission’s housing bore diameter and electrical connector type before installation. The sensor interfaces directly with the 4656101028: TRANSMISSION HOUSING and the 4656301066: HOUS.FRONT SECT to ensure proper alignment.
Frequently Asked Questions
Q: Can I use this sensor in a WG 200 transmission?
A: Yes, the 4656.125.009 is compatible with WG 200 models, provided the mounting thread and signal type match your control unit. Check your existing sensor’s part number for confirmation.
Q: What causes this inductive sensor to fail prematurely?
A: Common causes include exposure to high-temperature transmission fluid, physical damage from debris, or electrical surges. Regular inspection of the 4656201015: SCREEN SHEET and 4656301037: TUBE can help prevent contamination.
Q: Do I need to replace any seals when installing this sensor?
A: Yes, we recommend replacing the O-ring (part 0634313514) and cap screws (0636100803) to ensure a leak-free installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101028 | TRANSMISSION HOUSING | Encloses and protects internal gear sets |
| 4656301066 | HOUS.FRONT SECT | Front section of the transmission case |
| 4656201015 | SCREEN SHEET | Filters debris from hydraulic fluid |
| 4656301037 | TUBE | Routes fluid between valve body and cooler |
| 0634313514 | O-RING | Seals sensor and housing connections |
| 0636100803 | CAP SCREW | Secures sensor to housing |
| 4656301042 | HOUSING REAR PART | Rear section of transmission case |
| 0631306816 | CYLINDRICAL PIN | Aligns sensor during installation |
| 0636100801 | CAP SCREW | Fastens front housing section |
| 0636100160 | CAP SCREW | Mounts rear housing components |
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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