Overview
The ZF 4646.199.406 LOOSE PARTS assembly is a critical service kit designed for the WG260 transmission series, specifically addressing the internal valve body and clutch pack retention system. This OEM genuine part (SKU: 4646.199.406) contains the necessary loose hardware—including retaining rings, spacers, and thrust washers—that secure the planetary gear sets and prevent axial movement during high-torque operation. Positioned within the main transmission housing, this kit ensures that all loose components remain properly tensioned, directly influencing shift quality and overall driveline stability. When replacing this assembly, it is essential to also inspect the 0636115293: 螺栓 and the 0736300232: 螺栓 for thread wear, as these fasteners are torqued to the same sub-assembly.
Symptoms of Failure
- Intermittent gear slipping under load: Worn loose parts cause the clutch packs to lose clamping force, resulting in hesitation or RPM flare during acceleration, particularly in 3rd and 4th gears.
- Metallic rattling from the transmission pan: Loose spacers or retaining rings that have fatigued can produce a distinct rattle at idle or low speeds, often misdiagnosed as a torque converter issue.
- Oil contamination with fine metallic debris: As the loose parts degrade, they abrade against the drum surfaces, introducing aluminum or steel particles into the fluid, which can clog the filter and valve body.
- Erratic shift timing: A failing 4646.199.406 kit can cause delayed or harsh upshifts, as the valve body no longer receives consistent feedback from the secured planetary assembly.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4646.199.406 |
| Material Composition | Case-hardened steel (retaining rings), sintered bronze (thrust washers) |
| Weight (estimated) | 0.45 kg (1.0 lb) |
| OEM Reference | ZF Friedrichshafen AG – Genuine Loose Parts Kit |
| Torque Specification | 25 Nm (18.4 ft-lb) for associated fasteners |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This OEM genuine part is engineered for the ZF WG260 series and its derivatives. Based on the part’s design and application, it is compatible with the following transmission models: WG180, WG200, WG210, WG260, WG261, WG310, and WG311. The 4646.199.406 kit is also used in select off-highway and industrial drivetrains where the WG platform is employed. For proper installation, ensure the 4475280208: SCREW PLUG is replaced simultaneously to maintain hydraulic pressure integrity, and verify the 0634316523: O-RING is seated correctly to prevent cross-threading.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 0636115293 | 螺栓 | Secures valve body to transmission case |
| 0736300232 | 螺栓 | Fastens clutch pack retaining plate |
| 4475280208 | SCREW PLUG | Seals hydraulic test port |
| 0634316523 | O-RING | Prevents fluid leakage at plug interface |
| 0630361026 | SEALING CAP | Covers exposed hydraulic passages |
| 0501214611 | 齿轮泵 | Provides lubrication and cooling flow |
| 0634313945 | O形圈 | Seals pump housing to transmission |
| 0501322534 | TEMPERATURE SENSOR | Monitors fluid thermal condition |
| 0634313366 | O-RING | Seals sensor bore against pressure loss |
| 4646130044 | ENGINE CONNECTION | Links transmission to flywheel housing |
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