Overview
The ZF 4616.000.251 4 WG 65 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway machinery. This assembly integrates the clutch pack, planetary gear sets, and hydraulic control system into a single, ready-to-install package. As a core component of the WG 65 Series, it manages torque distribution across four forward and reverse speeds. The SKU 4616.000.251 replaces worn or failed assemblies in wheel loaders, dozers, and graders, ensuring seamless power transfer under extreme loads. This unit mounts directly to the engine bellhousing and connects to the final drive via the output shaft.
Symptoms of Failure
- Delayed or harsh gear engagement: When the assembly wears, hydraulic pressure drops, causing a noticeable lag or jarring shift between forward and reverse.
- Oil leaks at the housing interface: Worn seals or gaskets around the 4616.000.251 allow transmission fluid to escape, often visible as drips near the bellhousing or output flange.
- Gear slipping under load: Internal clutch pack wear leads to power loss during acceleration or when climbing grades, with the engine revving but vehicle speed failing to match.
- Unusual whining or grinding noises: Bearing fatigue or gear tooth damage inside the assembly produces a high-pitched whine or metallic grinding during operation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number / SKU | 4616.000.251 |
| Assembly Type | Complete Powershift Transmission |
| Series | WG 65 |
| Weight (estimated) | 185 kg (408 lbs) |
| Housing Material | Cast Iron (GGG-40) |
| OEM Reference | ZF 4 WG 65 |
| Overall Length | 720 mm |
| Input Spline Count | 14-tooth (SAE 3) |
| Hydraulic Pressure Range | 14–18 bar |
Compatibility
This assembly is engineered for the ZF WG 65 transmission series, which includes models such as the WG 65, WG 120, WG 180, and WG 200. It is a direct fit for machinery originally equipped with the 4 WG 65 powershift variant, commonly found in Volvo L70, L90, and Caterpillar 924G wheel loaders. Always verify the transmission model tag before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616101136 | TRANSMISSION HOUSING | Encloses and supports the gear train and clutch packs |
| 0636011038 | HEXAGON SCREW | Secures housing halves together |
| 0636011118 | HEXAGON SCREW | Fastens the valve body to the housing |
| 0636016015 | HEXAGON SCREW | Mounts the output flange assembly |
| 0631306085 | CYLINDRICAL PIN | Aligns housing and cover during assembly |
| 0634313118 | O-RING | Seals hydraulic passages between sections |
| 0636304019 | SCREW PLUG | Closes oil drain and test ports |
| 0634801152 | SEALING RING | Prevents fluid leaks at shaft exits |
| 0732611049 | FILTER INSERT | Traps contaminants in the hydraulic circuit |
| 0634303718 | O-RING | Seals the filter housing cap |
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