Overview
This OEM genuine ZF 4657.173.026 CLUTCH is a critical torque-transfer component engineered specifically for the WG 190 and WG 210 series transmissions. Positioned within the hydraulic control circuit, this clutch assembly engages and disengages planetary gear sets to facilitate smooth ratio changes under load. The SKU 4657.173.026 is manufactured to ZF’s exacting tolerances, ensuring precise frictional engagement and minimal power loss during operation. It sits directly inside the 4657101049: TRANSMISSION HOUSING, where it interfaces with the valve body and piston assemblies to modulate hydraulic pressure for reliable shifting.
Symptoms of Failure
- Delayed or harsh gear engagement: When the 4657.173.026 clutch wears, operators often notice a pronounced lag or jarring shift when moving from neutral into drive or reverse.
- Transmission slipping under load: A worn clutch disc set can cause the WG 190 or WG 210 to lose torque transfer during acceleration, especially on inclines or under heavy payloads.
- Burning odor or discolored fluid: Friction material degradation from a failing clutch generates excessive heat, producing a distinct burnt smell and darkening the transmission oil.
- Intermittent loss of forward or reverse: As the clutch pack loses clamping force, the transmission may randomly fail to engage a specific gear range, requiring multiple shift attempts.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4657.173.026 |
| Type | Multi-disc wet clutch assembly |
| Outer Diameter | 173 mm (estimated) |
| Inner Diameter | 126 mm (estimated) |
| Friction Material | High-carbon paper-based composite |
| Weight | 1.45 kg (approx.) |
| OEM Reference | ZF 4657.173.026 |
| Torque Capacity | 650 Nm (estimated) |
Compatibility
This genuine ZF clutch is designed for the WG 191 Series and WG 211 Series transmission families. It is a direct replacement for units originally fitted in WG 180, WG 190, WG 200, and WG 210 models. The 4657.173.026 clutch interfaces with the 4657301130: HOUS.FRONT SECT and the 4657301131: HOUSING REAR PART to form the complete clutch drum assembly. Additionally, the 0631306816: CYLINDRICAL PIN is used to align the clutch pack during installation, ensuring concentric rotation and preventing premature wear.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101049 | TRANSMISSION HOUSING | Encloses and supports the clutch assembly |
| 4657301130 | HOUS.FRONT SECT | Front section of the clutch drum housing |
| 4657301131 | HOUSING REAR PART | Rear section of the clutch drum housing |
| 0631306816 | CYLINDRICAL PIN | Alignment pin for clutch pack installation |
| 0636102489 | CAP SCREW | Secures the clutch housing to the transmission case |
| 4656301148 | FIXING PLATE | Retains the clutch piston within the drum |
| 0636102463 | CAP SCREW | Fastener for the fixing plate assembly |
| 4657201133 | SCREEN SHEET | Filter screen protecting clutch hydraulic passages |
| 0636115287 | CAP SCREW | Mounting bolt for the screen sheet |
| 4657301065 | PLATE | Backing plate for clutch disc stack |
Frequently Asked Questions
Q: Can the 4657.173.026 clutch be installed without replacing the piston seals?
A: It is strongly recommended to replace all seals and gaskets when installing this clutch. Worn seals can allow hydraulic pressure to bypass the clutch pack, causing the new assembly to slip prematurely.
Q: How do I verify that this clutch fits my WG 210 transmission?
A: Check the transmission model tag located on the side of the 4657101049: TRANSMISSION HOUSING. If the model number begins with WG 190, WG 191, WG 210, or WG 211, this clutch is a direct fit.
Q: What torque specification should I use for the cap screws when reassembling?
A: For the 0636102489: CAP SCREW and 0636102463: CAP SCREW, ZF specifies 25 Nm ± 2 Nm. Always use a calibrated torque wrench to avoid housing distortion.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
Request a Quote →
