Overview
The ZF 4646.138.004 FILTER is a critical OEM sub-assembly component engineered for the WG 250, WG 260, and WG 310 series transmissions. Positioned within the hydraulic control circuit, this filter ensures that transmission fluid remains free of particulate contaminants before it reaches the valve body and clutch packs. By maintaining fluid cleanliness, the SKU 4646.138.004 directly supports consistent shift quality and extends the service life of the entire drivetrain. This part is often replaced during major overhauls alongside the TRANSMISSION HOUSING to prevent debris from recirculating through the system.
Symptoms of Failure
- Erratic or delayed gear engagement: When the filter becomes clogged, hydraulic pressure drops, causing hesitation when shifting from neutral to drive or reverse.
- Intermittent transmission slipping: A restricted filter starves the clutches of oil, leading to momentary power loss under load, especially during uphill climbs.
- Visible metal particles in the oil pan: If the filter media tears or bypasses, fine metallic debris will appear in the fluid, indicating internal wear.
- Overheating transmission fluid: Reduced flow through a blocked filter forces the transmission to run hotter, often triggering warning lights on the dashboard.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4646.138.004 |
| OEM Reference | ZF 4646.138.004 |
| Material | High-grade cellulose with synthetic media |
| Dimensions (L x W x H) | 210 mm x 95 mm x 45 mm |
| Weight | 0.42 kg |
| Filtration Rating | 25 microns nominal |
| Burst Pressure | 15 bar |
Compatibility
This filter is designed for the ZF WG 250, WG 260, and WG 310 series transmissions, including the WG 258, WG 261, and WG 311 variants. It is also suitable for earlier WG 180 and WG 200 models that share the same hydraulic block architecture. When replacing this filter, always inspect the HOUSING for cracks or warping, and secure the assembly using the correct 螺栓 torque specifications. After installation, affix the updated TYPE PLATE to document the service interval.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101162 | TRANSMISSION HOUSING | Encloses the gear train and hydraulic circuits |
| 4646301334 | HOUSING | Supports the filter and valve body assembly |
| 0636115293 | 螺栓 | Secures the filter housing to the transmission case |
| 0730365125 | TYPE PLATE | Identifies transmission model and service history |
| 4646201003 | POT | Holds hydraulic fluid for the control system |
| 4646106024 | SHIFT SYSTEM | Manages gear selection and clutch modulation |
| 4646306071 | GASKET | Seals the filter housing to prevent leaks |
| 4646306072 | ADAPTER PLATE | Mounts the filter to the transmission block |
| 4646306073 | GASKET | Provides secondary sealing for the adapter plate |
| 0636102065 | CAP SCREW | Fastens the adapter plate to the housing |
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