Overview
The ZF 4616.303.176 PLATE is a precision-engineered internal component specifically designed for the WG 65 series of heavy-duty transmissions. This OEM genuine part functions as a critical separator or guide plate within the hydraulic control system, ensuring proper oil flow and pressure regulation between valve assemblies. The SKU 4616.303.176 is machined to exact ZF tolerances, preventing cross-contamination of hydraulic circuits and maintaining shift quality under high torque loads. Installed directly in the valve body stack, this plate works in concert with the 4616105416: VALVE to direct fluid precisely during gear changes.
Symptoms of Failure
- Erratic gear engagement under load: When the 4616.303.176 plate warps or develops surface scoring, hydraulic pressure drops cause delayed or harsh shifts, especially when towing heavy loads.
- Internal transmission oil leaks: A cracked or fatigued plate allows pressurized fluid to bypass the intended circuits, leading to visible oil seepage around the valve body gasket area.
- Intermittent slipping in higher gears: Worn plate surfaces fail to seal the 0501319251: SOLENOID VALVE ports correctly, resulting in momentary power loss during highway cruising.
- Contaminated hydraulic fluid: Degraded plate material can shed microscopic particles into the oil, accelerating wear on adjacent components like the 0636302013: SCREW PLUG and 0634801038: SEALING RING.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4616.303.176 |
| Material | Hardened alloy steel (C45E + nitrided) |
| Overall Length | 185 mm ±0.5 mm |
| Overall Width | 95 mm ±0.3 mm |
| Thickness | 8.2 mm |
| Weight | 0.74 kg |
| Surface Finish | Ra 0.8 µm (ground) |
| OEM Reference | 4616.303.176 (ZF original) |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This plate is a direct fit for the ZF WG65 series transmission family, including models WG65, WG80, WG120, WG150, WG180, and WG200. It is also compatible with certain WG250 variants produced after 2010. The 4616.303.176 plate is used in both on-highway truck applications and off-highway construction equipment where the WG series is installed. Always verify your transmission serial number against ZF documentation before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105416 | VALVE | Regulates hydraulic flow to clutch packs |
| 0501319251 | SOLENOID VALVE | Electro-hydraulic shift control |
| 0636302013 | SCREW PLUG | Seals pressure test ports |
| 0634801038 | SEALING RING | Prevents fluid bypass at joints |
| 4616305078 | CONSOLE | Mounting bracket for valve body |
| 0636010047 | HEXAGON SCREW | Secures plate to valve body |
| 0636101020 | CAP SCREW | Fastens solenoid valve assembly |
| 0630001010 | WASHER | Distributes load under fasteners |
| 0637006015 | HEXAGON NUT | Locks console mounting bolts |
| 0637842523 | SCREW-IN SLEEVE | Aligns hydraulic passages |
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