Overview
This genuine OEM ZF 4657.176.018 COUPLING is a critical driveline component engineered specifically for the WG 190 and WG 210 series transmissions. Positioned between the torque converter and the main gear shaft, this coupling ensures precise torque transfer and dampens torsional vibrations during shifting cycles. The SKU 4657.176.018 is manufactured to exact OEM tolerances, guaranteeing a direct fit without modification. When installed alongside the 4657101039: TRANSMISSION HOUSING, it forms a sealed assembly that maintains hydraulic pressure integrity during high-load operations.
Symptoms of Failure
- Delayed or harsh gear engagement: A worn 4657.176.018 coupling causes noticeable lag when shifting from neutral to drive, often accompanied by a metallic clunk.
- Transmission fluid contamination: Internal wear particles from the coupling can circulate through the system, leading to dark, gritty fluid and clogged filter screens.
- Vibration under acceleration: As the coupling loses its damping ability, drivers will feel a persistent shudder through the chassis, especially between 1500-2500 RPM.
- Intermittent power loss: Slipping at the coupling point results in RPM flare without corresponding vehicle speed increase, mimicking torque converter failure.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4657.176.018 |
| Outer Diameter | 176 mm |
| Inner Diameter | 68 mm |
| Overall Length | 92 mm |
| Material | Hardened alloy steel (42CrMo4) |
| Weight | 2.85 kg |
| OEM Reference | ZF 4657.176.018 |
| Torque Capacity | 1,850 Nm |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This coupling is designed for the ZF WG 190 series, including the WG 190, WG 190A, and WG 210 variants. It also fits select WG 180 and WG 200 models produced after 2008. For proper installation, ensure the 4657201028: HOUS.FRONT SECT and 4657201013: HOUSING REAR PART are free of scoring or wear. The coupling must be secured using the 0631306792: CYLINDRICAL PIN to prevent rotational misalignment during assembly.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101039 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4657201028 | HOUS.FRONT SECT | Front section housing for pump and clutch pack |
| 4657201013 | HOUSING REAR PART | Rear section supporting output shaft |
| 0631306792 | CYLINDRICAL PIN | Alignment dowel for coupling positioning |
| 0636100801 | CAP SCREW | M10 x 30 fastening bolt for housing |
| 4656301148 | FIXING PLATE | Locking plate for coupling retention |
| 4657301034 | SCREEN SHEET | Fine mesh filter for oil circuit |
| 4657301035 | SCREEN SHEET | Coarse mesh pre-filter |
| 0636100803 | CAP SCREW | M12 x 35 bolt for rear housing |
| 4681301040 | OIL FEED.HOUSG. | Lubrication channel housing |
Frequently Asked Questions
Q: How do I know if the 4657.176.018 coupling needs replacement?
A: Check for radial play by rotating the coupling by hand. Any movement exceeding 0.5 mm indicates wear. Also inspect for heat discoloration or pitting on the spline contact surfaces.
Q: Can this coupling be reused after a transmission rebuild?
A: ZF recommends always replacing the coupling during a major overhaul. The hardened steel surface work-hardens over time and may cause accelerated wear on mating components like the HOUS.FRONT SECT if reused.
Q: What torque specification is required for the retaining bolts?
A: Tighten the CAP SCREW fasteners to 85 Nm in a cross-pattern sequence, then apply an additional 90-degree angle turn. Always use new CYLINDRICAL PINs during reassembly.
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Phone: +86 158 2286 3467 |
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