Overview
The ZF 4642.138.001 FILTER for WG 150 is a critical hydraulic filtration component engineered to maintain fluid cleanliness within the transmission’s lubrication circuit. Positioned directly in the oil sump or return line, this OEM genuine part captures particulate contaminants before they can circulate through valve bodies, clutches, and bearings. The SKU 4642.138.001 is specifically designed for the WG 150 series, ensuring precise flow rates and micron-level filtration to protect internal clearances. When installed alongside a TRANSMISSION HOUSING (4642101108) or a TRANSMISSION HOUSING (4642301208), this filter forms the first line of defense against abrasive wear.
Symptoms of Failure
- Delayed gear engagement or slipping: A clogged filter restricts oil flow, causing low line pressure and sluggish shifting, especially under load.
- Overheating transmission fluid: When the filter bypass valve opens due to blockage, unfiltered oil circulates, increasing friction and thermal stress.
- Whining or humming noise from the sump: Starvation of the oil pump creates cavitation, producing audible metallic sounds during operation.
- Visible debris in the oil pan: A failed filter element allows metal shavings or clutch material to accumulate, often detected during routine fluid changes.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4642.138.001 |
| OEM Reference | ZF 4642.138.001 |
| Filtration Micron Rating | 25–40 µm (nominal) |
| Outer Diameter | 95 mm |
| Height | 145 mm |
| Material | Cellulose/synthetic blend with steel end caps |
| Weight | 0.35 kg |
| Bypass Valve Setting | 1.5 bar (22 psi) |
| Seal Type | Nitrile rubber O-ring |
Compatibility
This filter is primarily validated for the ZF WG 150 series, but it also fits the WG 180 and WG 200 transmissions due to shared sump dimensions and port configurations. It is not recommended for WG 120 or older Ecomat models without verifying housing depth. For proper sealing, always pair this filter with a new O-RING (0634303340) and inspect the TYPE PLATE (0730365125) for the correct revision level. Additionally, the GROOVED STUD (0631311009) must be torqued to specification to prevent filter bypass leakage.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4642101108 | TRANSMISSION HOUSING | Main structural casing for gear and valve assembly |
| 4642301208 | TRANSMISSION HOUSING | Alternate housing variant for WG series |
| 0730365125 | TYPE PLATE | Identification plate with transmission serial and model |
| 0631311009 | GROOVED STUD | Fastener for filter housing retention |
| 4642301168 | SCREEN SHEET | Coarse pre-filter for large debris |
| 4642301169 | SCREEN SHEET | Fine mesh screen for secondary filtration |
| 0636100621 | HEXAGON SCREW | Mounting bolt for filter bracket |
| 0630361029 | SEALING CAP | Protective cover for unused ports |
| 4642306254 | ADAPTER | Converter for alternative filter head connections |
| 0634303340 | O-RING | Seal between filter and housing |
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