Overview
The ZF 6006.016.109 FS SG 6 for WG65 is a critical OEM genuine component engineered for the WG 65 series transmission family. This part functions as a synchronizer assembly or shift sleeve unit, responsible for enabling smooth gear engagement within the countershaft and main shaft assembly. Positioned inside the transmission housing, it directly controls the locking and unlocking of gear sets during ratio changes. The SKU 6006.016.109 is precision-machined to ZF’s original tolerances, ensuring that hydraulic and mechanical forces are transferred without hesitation. When installed correctly alongside the TRANSMISSION HOUSING (4616101065), this part maintains the axial alignment necessary for long service life in heavy-duty applications.
Symptoms of Failure
- Hard shifting or gear clash: When the synchronizer hub wears, operators will experience grinding noises during upshifts or downshifts, especially under load.
- Unintended gear disengagement: A worn 6006.016.109 can cause the transmission to pop out of gear on deceleration, leading to dangerous loss of drive.
- Metallic debris in oil: Friction material from the synchronizer rings sheds into the lubricant, often visible during drain intervals or when inspecting the FILTER INSERT (0732611049).
- Delayed engagement from neutral: Operators may notice a pause before the transmission catches, indicating insufficient clamping force from the shift sleeve.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 6006.016.109 |
| Material | Case-hardened alloy steel with sintered bronze friction lining |
| Outer Diameter | ~145 mm |
| Inner Diameter | ~85 mm |
| Weight | 1.8 kg (approx.) |
| OEM Reference | ZF FS SG 6 for WG65 |
| Torque Capacity | Up to 2,500 Nm |
Compatibility
This genuine ZF part is specifically designed for the WG 65 series transmission, which includes models such as the WG180, WG200, and WG210. It is also backward-compatible with certain WG 60 series units where the shift sleeve geometry matches. The 6006.016.109 synchronizer assembly interfaces directly with the main shaft and requires the use of specific fasteners: the HEXAGON SCREW (0636011038) for the shift fork, the HEXAGON SCREW (0636011118) for the hub retention, and the HEXAGON SCREW (0636016015) for the end cover. Always verify the spline count and hub diameter against your transmission’s serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101065 | TRANSMISSION HOUSING | Encloses and supports all internal gear train components |
| 0636011038 | HEXAGON SCREW | Secures shift fork to the synchronizer rail |
| 0636011118 | HEXAGON SCREW | Fastens synchronizer hub to the main shaft |
| 0636016015 | HEXAGON SCREW | Retains the rear bearing cover assembly |
| 0631306085 | CYLINDRICAL PIN | Aligns shift fork and synchronizer sleeve during assembly |
| 0634313118 | O-RING | Seals the shift cylinder bore against oil leakage |
| 0636304019 | SCREW PLUG | Closes oil passages in the valve body |
| 0634801152 | SEALING RING | Prevents fluid bypass around the piston |
| 0732611049 | FILTER INSERT | Traps debris from synchronizer wear before it reaches the pump |
| 0634303718 | O-RING | Seals the filter housing cover |
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