Overview
The ZF 4616.000.258 4 WG 65 Powershift Transmission Assembly is a complete, factory-matched unit designed for heavy-duty off-highway machinery. This assembly integrates the torque converter, planetary gear sets, and hydraulic control system into a single, ready-to-install package. As the core of the WG 65 series, it manages power distribution across four forward and reverse speeds, ensuring smooth clutch engagement under load. The SKU 4616.000.258 is a direct OEM replacement, eliminating the need for partial rebuilds. For precise hydraulic modulation, this unit works in tandem with the 4616105416: VALVE and the 0501319251: SOLENOID VALVE to regulate shift timing and pressure.
Symptoms of Failure
- Delayed or harsh shifting: When the internal clutch packs or seals degrade, you will notice a pronounced lag between gear selections or a jarring engagement. This often points to worn valve bodies or solenoids.
- Transmission fluid leaks at the housing: A failing assembly can develop cracks or seal failures, leading to visible oil drips around the bell housing or output flange. Check the 0634801038: SEALING RING for integrity during inspection.
- Loss of power under load: If the transmission slips or fails to hold torque when climbing grades or pushing material, internal planetary gear wear or a failing torque converter is likely.
- Unusual whining or grinding noises: Metal-to-metal contact from bearing failure or debris in the hydraulic circuit produces audible distress, often requiring immediate unit replacement.
Technical Specifications
| Parameter | Specification |
|---|---|
| OEM Part Number | 4616.000.258 |
| Assembly Type | Complete Powershift Transmission |
| Series | WG 65 |
| Housing Material | High-Grade Cast Iron |
| Dry Weight (approx.) | 385 kg (849 lbs) |
| Overall Length | 720 mm |
| Overall Width | 510 mm |
| Overall Height | 580 mm |
| Fluid Capacity | 28 liters (SAE 10W or equivalent) |
| Max Input Torque | 1,200 Nm |
| OEM Reference | ZF 4 WG 65 |
Compatibility
This complete unit is engineered for the ZF WG 65 series of powershift transmissions. It is directly compatible with models such as the WG65, WG80, WG100, and WG120 found in loaders, graders, and industrial tractors. The assembly is not interchangeable with the larger WG180 or WG200 series without significant adapter modifications. When installing, always replace the 0636302013: SCREW PLUG and associated fasteners to maintain proper sealing and torque specifications.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105416 | VALVE | Hydraulic flow control for clutch modulation |
| 0501319251 | SOLENOID VALVE | Electro-hydraulic shift actuation |
| 0636302013 | SCREW PLUG | Seals hydraulic ports and drain points |
| 0634801038 | SEALING RING | Prevents fluid leakage at joint interfaces |
| 4616305078 | CONSOLE | Mounting bracket for transmission control |
| 0636010047 | HEXAGON SCREW | Secures housing and cover plates |
| 0636101020 | CAP SCREW | High-tensile fastener for critical joints |
| 0630001010 | WASHER | Distributes load under bolt heads |
| 0637006015 | HEXAGON NUT | Locking nut for threaded assemblies |
| 0637842523 | SCREW-IN SLEEVE | Spacer or alignment sleeve for gear train |
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