Overview
The ZF 4646.183.225 LOOSE PARTS assembly is a critical service kit designed specifically for the WG 261 series transmission. This OEM genuine part provides the necessary hardware and sealing components to maintain the integrity of the transmission’s valve body and hydraulic control unit. Positioned within the lower valve body section, the 4646.183.225 ensures proper fluid routing and pressure regulation. The SKU 4646.183.225 is a factory-sealed kit that replaces worn fasteners and seals, preventing cross-threading and fluid bypass that can compromise shift quality. When installing this kit, technicians should also inspect the 0636115293: 螺栓 and 0736300232: 螺栓 for proper torque specifications, as these fasteners secure the valve body to the transmission case.
Symptoms of Failure
When the components within the ZF 4646.183.225 LOOSE PARTS kit degrade, operators may notice several distinct failure modes. Oil leaks around the valve body gasket are the most common symptom, often appearing as drips from the transmission pan rail. Erratic gear engagement or delayed shifting occurs when internal seals lose elasticity, allowing hydraulic pressure to bleed between circuits. Transmission overheating can result from improper fluid flow caused by loose or damaged hardware. Whining or buzzing noises from the transmission indicate that the 4475280208: SCREW PLUG may have loosened, allowing air ingress into the hydraulic system. Additionally, the 0634316523: O-RING should be replaced simultaneously to prevent cross-contamination of fluid passages.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4646.183.225 |
| OEM Reference | ZF 4646.183.225 |
| Material Composition | Steel fasteners with nitrile rubber seals |
| Weight | 0.45 kg (1.0 lb) |
| Thread Size (Primary Bolt) | M8 x 1.25 |
| Operating Temperature Range | -40°C to +150°C |
| Torque Specification | 25 Nm ± 2 Nm |
| Package Contents | Bolts, washers, O-rings, screw plug |
Compatibility
This ZF 4646.183.225 LOOSE PARTS kit is engineered for the WG 261 series transmission, but its application extends to several other ZF models that share the same valve body architecture. Compatible transmissions include the WG180, WG200, WG250, and WG261 series. The kit also fits select Ecomat 4HP and 6HP variants where the lower valve body uses identical fastener patterns. For heavy-duty applications, the ZF AS Tronic series may require this kit during clutch actuator service. Always verify the transmission serial number against ZF’s compatibility chart, as the 0630361026: SEALING CAP and 0501214611: 齿轮泵 may differ between model years.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0636115293 | 螺栓 | Secures valve body to transmission case |
| 0736300232 | 螺栓 | Fastens oil pan and filter assembly |
| 4475280208 | SCREW PLUG | Seals hydraulic test ports |
| 0634316523 | O-RING | Prevents fluid leakage at plug interface |
| 0630361026 | SEALING CAP | Protects unused ports from debris |
| 0501214611 | 齿轮泵 | Provides hydraulic pressure for shifting |
| 0634313945 | O形圈 | Seals pump outlet to valve body |
| 0501322534 | TEMPERATURE SENSOR | Monitors fluid temperature for ECU |
| 0634313366 | O-RING | Seals sensor bore in valve body |
| 4644301014 | 挡油盘 | Directs oil flow to clutch packs |
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