Overview
The ZF 4665.275.001 COUPLING is a critical driveline component engineered specifically for the WG 160 and WG 171 series transmissions. This OEM genuine part serves as the primary torque-transfer interface between the transmission output shaft and the downstream driveline, ensuring smooth power delivery and vibration dampening during heavy-duty operation. The SKU 4665.275.001 is precision-machined to maintain concentric alignment, reducing stress on adjacent assemblies such as the TRANSMISSION HOUSING and the HOUS.FRONT SECT. Without this coupling, the transmission cannot transfer rotational force to the wheels, making it a non-negotiable element for operational uptime.
Symptoms of Failure
- Transmission coupling oil leak at bell housing: Worn seals within the 4665.275.001 allow transmission fluid to escape, often pooling near the housing joint. This is a common long-tail search query for fleet maintenance teams.
- Clunking noise during gear engagement: Excessive play in the coupling splines produces a metallic clunk when shifting from neutral to drive or reverse, indicating imminent failure.
- Vibration under load at highway speeds: A degraded coupling loses its dampening capacity, transmitting driveline shudder through the chassis, particularly in WG160-equipped vehicles.
- Intermittent gear slipping or delayed engagement: As the coupling wears, torque transfer becomes inconsistent, causing the transmission to hesitate before engaging gears.
Technical Specifications
| Part Number | 4665.275.001 |
| Material | High-tensile alloy steel with nitrided spline surface |
| Outer Diameter | 175 mm |
| Overall Length | 98 mm |
| Spline Count | 24 internal / 24 external |
| Weight | 2.85 kg |
| OEM Reference | ZF 4665.275.001 (Genuine) |
| Operating Torque Range | 1,200 – 1,800 Nm |
Compatibility
This coupling is factory-specified for the ZF WG 160 Series and WG 171 Series transmissions. It is also mechanically compatible with the WG 180 and WG 200 series when used in conjunction with the correct HOUSING REAR PART and HOUSING REAR SECTION. Always verify spline engagement depth with your specific transmission variant before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101070 | TRANSMISSION HOUSING | Main structural casing that encloses the gearset and coupling assembly |
| 4656201085 | HOUS.FRONT SECT | Forward section of the housing that supports the input shaft bearing |
| 4656201089 | HOUSING REAR PART | Rear housing segment that aligns the output shaft and coupling |
| 4656298057 | HOUSING REAR SECTION | Extended rear housing cover for WG171 series transmissions |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for precise housing-to-coupling positioning |
| 4656301148 | FIXING PLATE | Retains the coupling in its axial position within the housing |
| 0636100817 | CAP SCREW | M10 fastener for securing the fixing plate to the housing |
| 4656301016 | SCREEN SHEET | Fine mesh filter protecting the coupling from debris ingress |
| 4656301017 | SCREEN SHEET | Secondary filter screen for high-flow oil circuits |
| 0636100803 | CAP SCREW | M8 cap screw for screen sheet retention |
Frequently Asked Questions
Q: Can the 4665.275.001 coupling be reused after a transmission overhaul?
A: ZF recommends replacing this coupling with a new OEM part during any major rebuild. The splines wear microscopically over time, and reuse can lead to premature failure of the TRANSMISSION HOUSING due to fretting.
Q: How do I confirm this coupling fits my WG160 transmission?
A: Measure the output shaft spline diameter (must be 175 mm) and count 24 splines. Also verify that your HOUSING REAR PART has the corresponding internal spline pocket.
Q: What torque specification is required for the fixing plate cap screws?
A: Use 45 Nm for the CAP SCREW (0636100817) and 22 Nm for the CAP SCREW (0636100803). Always apply thread locker.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
